added onDownloadStart event, onLoadResourceCustomScheme event and...

added onDownloadStart event, onLoadResourceCustomScheme event and resourceCustomSchemes option, onTargetBlank event and useOnTargetBlank option, code refactoring

CHANGELOG.md

 ## 1.3.0
 
-- Merge
-- Merge
-- Merge
-- Merge
-- Merge
-- Merge
+- Merge "Avoid null pointer exception after webview is disposed" [#116](https://github.com/pichillilorenzo/flutter_inappbrowser/pull/116) (thanks to [robsonfingo](https://github.com/robsonfingo))
+- Merge "Remove async call in close" [#119](https://github.com/pichillilorenzo/flutter_inappbrowser/pull/119) (thanks to [benfingo](https://github.com/benfingo))
+- Merge "Android takeScreenshot does not work properly." [#122](https://github.com/pichillilorenzo/flutter_inappbrowser/pull/122) (thanks to [PauloMelo](https://github.com/PauloMelo))
+- Merge "Resolving gradle error." [#144](https://github.com/pichillilorenzo/flutter_inappbrowser/pull/144) (thanks to [Klingens13](https://github.com/Klingens13))
+- Merge "Create issue and pull request templates" [#150](https://github.com/pichillilorenzo/flutter_inappbrowser/pull/150) (thanks to [deandreamatias](https://github.com/deandreamatias))
+- Merge "Fix abstract method error && swift version error" [#155](https://github.com/pichillilorenzo/flutter_inappbrowser/pull/155) (thanks to [AlexVincent525](https://github.com/AlexVincent525))
+- Merge "migrating to swift 5.0" [#162](https://github.com/pichillilorenzo/flutter_inappbrowser/pull/162) (thanks to [fattiger00](https://github.com/fattiger00))
+- Merge "Update readme example" [#178](https://github.com/pichillilorenzo/flutter_inappbrowser/pull/178) (thanks to [SebastienBtr](https://github.com/SebastienBtr))
 - Added `horizontalScrollBarEnabled` and `verticalScrollBarEnabled` options to enable/disable the corresponding scrollbar of the WebView [#165](https://github.com/pichillilorenzo/flutter_inappbrowser/issues/165)
-
+- Added `onDownloadStart` event: event fires when the WebView recognizes and starts a downloadable file.
+- Added `onLoadResourceCustomScheme` event and `resourceCustomSchemes` option to set custom schemes that WebView must handle to load resources
+- Added `onTargetBlank` event and `useOnTargetBlank` option to manage links with `target="_blank"`
 
 ## 1.2.1
 

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/ChromeCustomTabs/ChromeCustomTabsActivity.java

@@ -36,7 +36,7 @@ public class ChromeCustomTabsActivity extends Activity {
     options = new ChromeCustomTabsOptions();
     options.parse((HashMap<String, Object>) b.getSerializable("options"));
 
-    InAppBrowserFlutterPlugin.chromeCustomTabsActivities.put(uuid, this);
+    InAppBrowserFlutterPlugin.instance.chromeCustomTabsActivities.put(uuid, this);
 
     customTabActivityHelper = new CustomTabActivityHelper();
     builder = new CustomTabsIntent.Builder();
@@ -49,8 +49,8 @@ public class ChromeCustomTabsActivity extends Activity {
 
     Map<String, Object> obj = new HashMap<>();
     obj.put("uuid", uuid);
-    InAppBrowserFlutterPlugin.channel.invokeMethod("onChromeSafariBrowserOpened", obj);
-    InAppBrowserFlutterPlugin.channel.invokeMethod("onChromeSafariBrowserLoaded", obj);
+    InAppBrowserFlutterPlugin.instance.channel.invokeMethod("onChromeSafariBrowserOpened", obj);
+    InAppBrowserFlutterPlugin.instance.channel.invokeMethod("onChromeSafariBrowserLoaded", obj);
   }
 
   private void prepareCustomTabs() {
@@ -86,7 +86,7 @@ public class ChromeCustomTabsActivity extends Activity {
       finish();
       Map<String, Object> obj = new HashMap<>();
       obj.put("uuid", uuid);
-      InAppBrowserFlutterPlugin.channel.invokeMethod("onChromeSafariBrowserClosed", obj);
+      InAppBrowserFlutterPlugin.instance.channel.invokeMethod("onChromeSafariBrowserClosed", obj);
     }
   }
 

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/FlutterWebView.java

@@ -13,6 +13,7 @@ import com.pichillilorenzo.flutter_inappbrowser.InAppWebView.InAppWebViewOptions
 
 import java.io.IOException;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 import io.flutter.plugin.common.MethodCall;

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/InAppBrowserActivity.java

@@ -24,6 +24,7 @@ import com.pichillilorenzo.flutter_inappbrowser.InAppWebView.InAppWebViewOptions
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -67,7 +68,7 @@ public class InAppBrowserActivity extends AppCompatActivity {
     webViewOptions.parse(optionsMap);
     webView.options = webViewOptions;
 
-    InAppBrowserFlutterPlugin.webViewActivities.put(uuid, this);
+    InAppBrowserFlutterPlugin.instance.webViewActivities.put(uuid, this);
 
     actionBar = getSupportActionBar();
 
@@ -89,7 +90,7 @@ public class InAppBrowserActivity extends AppCompatActivity {
 
     Map<String, Object> obj = new HashMap<>();
     obj.put("uuid", uuid);
-    InAppBrowserFlutterPlugin.channel.invokeMethod("onBrowserCreated", obj);
+    InAppBrowserFlutterPlugin.instance.channel.invokeMethod("onBrowserCreated", obj);
 
   }
 
@@ -253,7 +254,7 @@ public class InAppBrowserActivity extends AppCompatActivity {
       if (canGoBack())
         goBack();
       else if (options.closeOnCannotGoBack)
-        InAppBrowserFlutterPlugin.close(this, uuid, null);
+        InAppBrowserFlutterPlugin.instance.close(this, uuid, null);
       return true;
     }
     return super.onKeyDown(keyCode, event);
@@ -352,7 +353,7 @@ public class InAppBrowserActivity extends AppCompatActivity {
   }
 
   public void closeButtonClicked(MenuItem item) {
-    InAppBrowserFlutterPlugin.close(this, uuid, null);
+    InAppBrowserFlutterPlugin.instance.close(this, uuid, null);
   }
 
   public byte[] takeScreenshot() {

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/InAppBrowserFlutterPlugin.java

@@ -57,16 +57,18 @@ import io.flutter.plugin.common.PluginRegistry.Registrar;
  */
 public class InAppBrowserFlutterPlugin implements MethodCallHandler {
 
+  public static InAppBrowserFlutterPlugin instance;
   public Registrar registrar;
-  public static MethodChannel channel;
-  public static Map<String, InAppBrowserActivity> webViewActivities = new HashMap<>();
-  public static Map<String, ChromeCustomTabsActivity> chromeCustomTabsActivities = new HashMap<>();
+  public MethodChannel channel;
+  public Map<String, InAppBrowserActivity> webViewActivities = new HashMap<>();
+  public Map<String, ChromeCustomTabsActivity> chromeCustomTabsActivities = new HashMap<>();
 
   protected static final String LOG_TAG = "IABFlutterPlugin";
 
   public InAppBrowserFlutterPlugin(Registrar r) {
     registrar = r;
     channel = new MethodChannel(registrar.messenger(), "com.pichillilorenzo/flutter_inappbrowser");
+    channel.setMethodCallHandler(this);
   }
 
   /**
@@ -77,8 +79,7 @@ public class InAppBrowserFlutterPlugin implements MethodCallHandler {
     // registrar.activity() may return null because of Flutter's background execution feature
     // described here: https://medium.com/flutter-io/executing-dart-in-the-background-with-flutter-plugins-and-geofencing-2b3e40a1a124
     if (activity != null) {
-      final MethodChannel channel = new MethodChannel(registrar.messenger(), "com.pichillilorenzo/flutter_inappbrowser");
-      channel.setMethodCallHandler(new InAppBrowserFlutterPlugin(registrar));
+      instance = new InAppBrowserFlutterPlugin(registrar);
 
       new MyCookieManager(registrar);
 
@@ -599,7 +600,7 @@ public class InAppBrowserFlutterPlugin implements MethodCallHandler {
     return false;
   }
 
-  public static void close(Activity activity, final String uuid, final Result result) {
+  public void close(Activity activity, final String uuid, final Result result) {
     final InAppBrowserActivity inAppBrowserActivity = webViewActivities.get(uuid);
     if (inAppBrowserActivity != null) {
       activity.runOnUiThread(new Runnable() {

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/InAppWebView/InAppWebChromeClient.java

@@ -6,6 +6,7 @@ import android.graphics.BitmapFactory;
 import android.graphics.Color;
 import android.net.Uri;
 import android.os.Build;
+import android.util.Log;
 import android.view.View;
 import android.webkit.ConsoleMessage;
 import android.webkit.ValueCallback;
@@ -84,6 +85,19 @@ public class InAppWebChromeClient extends WebChromeClient {
     decorView.setSystemUiVisibility(3846 | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
   }
 
+  @Override
+  public boolean onCreateWindow(WebView view, boolean dialog, boolean userGesture, android.os.Message resultMsg)
+  {
+    WebView.HitTestResult result = view.getHitTestResult();
+    String data = result.getExtra();
+    Map<String, Object> obj = new HashMap<>();
+    if (inAppBrowserActivity != null)
+      obj.put("uuid", inAppBrowserActivity.uuid);
+    obj.put("url", data);
+    getChannel().invokeMethod("onTargetBlank", obj);
+    return false;
+  }
+
   @Override
   public boolean onConsoleMessage(ConsoleMessage consoleMessage) {
     Map<String, Object> obj = new HashMap<>();
@@ -190,6 +204,6 @@ public class InAppWebChromeClient extends WebChromeClient {
   }
 
   private MethodChannel getChannel() {
-    return (inAppBrowserActivity != null) ? InAppBrowserFlutterPlugin.channel : flutterWebView.channel;
+    return (inAppBrowserActivity != null) ? InAppBrowserFlutterPlugin.instance.channel : flutterWebView.channel;
   }
 }

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/InAppWebView/InAppWebView.java

@@ -2,25 +2,17 @@ package com.pichillilorenzo.flutter_inappbrowser.InAppWebView;
 
 import android.Manifest;
 import android.app.Activity;
-import android.app.DownloadManager;
-import android.content.BroadcastReceiver;
 import android.content.Context;
-import android.content.Intent;
-import android.content.IntentFilter;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Color;
-import android.graphics.Picture;
-import android.net.Uri;
 import android.os.Build;
-import android.os.Environment;
 import android.util.AttributeSet;
 import android.util.JsonReader;
 import android.util.JsonToken;
 import android.util.Log;
 import android.webkit.CookieManager;
 import android.webkit.DownloadListener;
-import android.webkit.URLUtil;
 import android.webkit.ValueCallback;
 import android.webkit.WebBackForwardList;
 import android.webkit.WebHistoryItem;
@@ -47,8 +39,6 @@ import io.flutter.plugin.common.PluginRegistry;
 import okhttp3.Cache;
 import okhttp3.OkHttpClient;
 
-import static android.content.Context.DOWNLOAD_SERVICE;
-
 public class InAppWebView extends WebView {
 
   static final String LOG_TAG = "InAppWebView";
@@ -56,7 +46,7 @@ public class InAppWebView extends WebView {
   public PluginRegistry.Registrar registrar;
   public InAppBrowserActivity inAppBrowserActivity;
   public FlutterWebView flutterWebView;
-  int id;
+  public int id;
   InAppWebViewClient inAppWebViewClient;
   InAppWebChromeClient inAppWebChromeClient;
   public InAppWebViewOptions options;
@@ -137,39 +127,19 @@ public class InAppWebView extends WebView {
     inAppWebViewClient = new InAppWebViewClient((isFromInAppBrowserActivity) ? inAppBrowserActivity : flutterWebView);
     setWebViewClient(inAppWebViewClient);
 
-    activity.registerReceiver(onDownloadComplete, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
-
     setDownloadListener(new DownloadListener() {
         @Override
         public void onDownloadStart(final String url, final String userAgent,
                                     final String contentDisposition, final String mimetype,
                                     final long contentLength) {
-
             RequestPermissionHandler.checkAndRun(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE, RequestPermissionHandler.REQUEST_CODE_WRITE_EXTERNAL_STORAGE, new Runnable(){
                 @Override
                 public void run(){
-
-                    Log.e(LOG_TAG, url);
-                    Log.e(LOG_TAG, contentDisposition);
-                    Log.e(LOG_TAG, mimetype);
-
-                    DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
-
-                    final String filename = URLUtil.guessFileName(url, contentDisposition, mimetype);
-                    request.allowScanningByMediaScanner();
-                    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED); //Notify client once download is completed!
-                    request.setVisibleInDownloadsUi(true);
-                    request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, filename);
-                    DownloadManager dm = (DownloadManager) activity.getSystemService(DOWNLOAD_SERVICE);
-                    if (dm != null) {
-                        dm.enqueue(request);
-                        //Toast.makeText(getApplicationContext(), "Downloading File: " + filename, //To notify the Client that the file is being downloaded
-                        //        Toast.LENGTH_LONG).show();
-                    }
-                    else {
-                        //Toast.makeText(getApplicationContext(), "Cannot Download File: " + filename, //To notify the Client that the file cannot be downloaded
-                        //        Toast.LENGTH_LONG).show();
-                    }
+                    Map<String, Object> obj = new HashMap<>();
+                    if (inAppBrowserActivity != null)
+                      obj.put("uuid", inAppBrowserActivity.uuid);
+                    obj.put("url", url);
+                    getChannel().invokeMethod("onDownloadStart", obj);
                 }
             });
         }
@@ -181,6 +151,7 @@ public class InAppWebView extends WebView {
     settings.setJavaScriptCanOpenWindowsAutomatically(options.javaScriptCanOpenWindowsAutomatically);
     settings.setBuiltInZoomControls(options.builtInZoomControls);
     settings.setDisplayZoomControls(options.displayZoomControls);
+    settings.setSupportMultipleWindows(options.useOnTargetBlank);
 
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
       settings.setSafeBrowsingEnabled(options.safeBrowsingEnabled);
@@ -215,30 +186,21 @@ public class InAppWebView extends WebView {
 
     if (!options.mixedContentMode.isEmpty()) {
       if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-        if (options.mixedContentMode.equals("MIXED_CONTENT_COMPATIBILITY_MODE")) {
+        switch (options.mixedContentMode) {
+          case "MIXED_CONTENT_COMPATIBILITY_MODE":
             settings.setMixedContentMode(WebSettings.MIXED_CONTENT_COMPATIBILITY_MODE);
-        } else if (options.mixedContentMode.equals("MIXED_CONTENT_ALWAYS_ALLOW")) {
+            break;
+          case "MIXED_CONTENT_ALWAYS_ALLOW":
             settings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
-        } else if (options.mixedContentMode.equals("MIXED_CONTENT_NEVER_ALLOW")) {
+            break;
+          case "MIXED_CONTENT_NEVER_ALLOW":
             settings.setMixedContentMode(WebSettings.MIXED_CONTENT_NEVER_ALLOW);
+            break;
         }
       }
     }
   }
 
-  private BroadcastReceiver onDownloadComplete = new BroadcastReceiver() {
-    @Override
-    public void onReceive(Context context, Intent intent) {
-      //Fetching the download id received with the broadcast
-      long id = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
-      //Checking if the received broadcast is for our enqueued download by matching download id
-      if (1 == id) { // test
-      //if (downloadID == id) {
-        //Toast.makeText(MainActivity.this, "Download Completed", Toast.LENGTH_SHORT).show();
-      }
-    }
-  };
-
   public void loadUrl(String url, MethodChannel.Result result) {
     if (!url.isEmpty()) {
       loadUrl(url);
@@ -332,7 +294,7 @@ public class InAppWebView extends WebView {
   }
 
   public byte[] takeScreenshot() {
-    float scale = getScale();
+    float scale = getResources().getDisplayMetrics().density; // getScale();
     int height = (int) (getContentHeight() * scale + 0.5);
 
     Bitmap b = Bitmap.createBitmap( getWidth(),
@@ -384,7 +346,7 @@ public class InAppWebView extends WebView {
     if (newOptionsMap.get("domStorageEnabled") != null && options.domStorageEnabled != newOptions.domStorageEnabled)
       settings.setDomStorageEnabled(newOptions.domStorageEnabled);
 
-    if (newOptionsMap.get("userAgent") != null && options.userAgent != newOptions.userAgent && !newOptions.userAgent.isEmpty())
+    if (newOptionsMap.get("userAgent") != null && !options.userAgent.equals(newOptions.userAgent) && !newOptions.userAgent.isEmpty())
       settings.setUserAgentString(newOptions.userAgent);
 
     if (newOptionsMap.get("clearCache") != null && newOptions.clearCache)
@@ -415,18 +377,25 @@ public class InAppWebView extends WebView {
       }
     }
 
-    if (newOptionsMap.get("mixedContentMode") != null && options.mixedContentMode != newOptions.mixedContentMode) {
+    if (newOptionsMap.get("mixedContentMode") != null && !options.mixedContentMode.equals(newOptions.mixedContentMode)) {
       if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-        if (newOptions.mixedContentMode.equals("MIXED_CONTENT_COMPATIBILITY_MODE")) {
+        switch (newOptions.mixedContentMode) {
+          case "MIXED_CONTENT_COMPATIBILITY_MODE":
             settings.setMixedContentMode(WebSettings.MIXED_CONTENT_COMPATIBILITY_MODE);
-        } else if (newOptions.mixedContentMode.equals("MIXED_CONTENT_ALWAYS_ALLOW")) {
+            break;
+          case "MIXED_CONTENT_ALWAYS_ALLOW":
             settings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
-        } else if (newOptions.mixedContentMode.equals("MIXED_CONTENT_NEVER_ALLOW")) {
+            break;
+          case "MIXED_CONTENT_NEVER_ALLOW":
             settings.setMixedContentMode(WebSettings.MIXED_CONTENT_NEVER_ALLOW);
+            break;
         }
       }
     }
 
+    if (newOptionsMap.get("useOnTargetBlank") != null && options.useOnTargetBlank != newOptions.useOnTargetBlank)
+      settings.setSupportMultipleWindows(newOptions.useOnTargetBlank);
+
     options = newOptions;
   }
 
@@ -562,13 +531,11 @@ public class InAppWebView extends WebView {
   }
 
   private MethodChannel getChannel() {
-    return (inAppBrowserActivity != null) ? InAppBrowserFlutterPlugin.channel : flutterWebView.channel;
+    return (inAppBrowserActivity != null) ? InAppBrowserFlutterPlugin.instance.channel : flutterWebView.channel;
   }
 
   @Override
   public void destroy() {
-    final Activity activity = (inAppBrowserActivity != null) ? inAppBrowserActivity : registrar.activity();
-    activity.unregisterReceiver(onDownloadComplete);
     super.destroy();
   }
 }

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/InAppWebView/InAppWebViewClient.java

@@ -9,6 +9,7 @@ import androidx.annotation.RequiresApi;
 
 import android.os.Handler;
 import android.os.Looper;
+import android.util.Base64;
 import android.util.Log;
 import android.webkit.CookieManager;
 import android.webkit.CookieSyncManager;
@@ -24,6 +25,7 @@ import com.pichillilorenzo.flutter_inappbrowser.FlutterWebView;
 import com.pichillilorenzo.flutter_inappbrowser.InAppBrowserActivity;
 import com.pichillilorenzo.flutter_inappbrowser.InAppBrowserFlutterPlugin;
 import com.pichillilorenzo.flutter_inappbrowser.JavaScriptBridgeInterface;
+import com.pichillilorenzo.flutter_inappbrowser.Util;
 
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
@@ -116,6 +118,7 @@ public class InAppWebViewClient extends WebViewClient {
       return true;
     }
 
+    if (url != null) {
       if (url.startsWith(WebView.SCHEME_TEL)) {
         try {
           Intent intent = new Intent(Intent.ACTION_DIAL);
@@ -166,6 +169,7 @@ public class InAppWebViewClient extends WebViewClient {
           Log.e(LOG_TAG, "Error sending sms " + url + ":" + e.toString());
         }
       }
+    }
 
     return super.shouldOverrideUrlLoading(webView, url);
 
@@ -300,13 +304,36 @@ public class InAppWebViewClient extends WebViewClient {
   @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
   @Override
   public WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request) {
+
+    InAppWebView webView = (InAppWebView) view;
+
+    final String url = request.getUrl().toString();
+    String scheme = request.getUrl().getScheme();
+
+    if (webView.options.resourceCustomSchemes != null && webView.options.resourceCustomSchemes.contains(scheme)) {
+      final Map<String, Object> obj = new HashMap<>();
+      if (inAppBrowserActivity != null)
+        obj.put("uuid", inAppBrowserActivity.uuid);
+      obj.put("url", url);
+      obj.put("scheme", scheme);
+
+      Util.WaitFlutterResult flutterResult = Util.invokeMethodAndWait(getChannel(), "onLoadResourceCustomScheme", obj);
+
+      if (flutterResult.error != null) {
+        Log.d(LOG_TAG, flutterResult.error);
+      }
+      else if (flutterResult.result != null) {
+        Map<String, String> res = (Map<String, String>) flutterResult.result;
+        byte[] data = Base64.decode(res.get("base64data"), Base64.DEFAULT);
+        return new WebResourceResponse(res.get("content-type"), res.get("content-encoding"), new ByteArrayInputStream(data));
+      }
+    }
+
     if (!request.getMethod().toLowerCase().equals("get") ||
             !(((inAppBrowserActivity != null) ? inAppBrowserActivity.webView : flutterWebView.webView).options.useOnLoadResource)) {
       return null;
     }
 
-    final String url = request.getUrl().toString();
-
     try {
       Request mRequest = new Request.Builder().url(url).build();
 
@@ -399,7 +426,7 @@ public class InAppWebViewClient extends WebViewClient {
   }
 
   private MethodChannel getChannel() {
-    return (inAppBrowserActivity != null) ? InAppBrowserFlutterPlugin.channel : flutterWebView.channel;
+    return (inAppBrowserActivity != null) ? InAppBrowserFlutterPlugin.instance.channel : flutterWebView.channel;
   }
 
 }

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/InAppWebView/InAppWebViewOptions.java

@@ -2,12 +2,16 @@ package com.pichillilorenzo.flutter_inappbrowser.InAppWebView;
 
 import com.pichillilorenzo.flutter_inappbrowser.Options;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class InAppWebViewOptions extends Options {
 
   static final String LOG_TAG = "InAppWebViewOptions";
 
   public boolean useShouldOverrideUrlLoading = false;
   public boolean useOnLoadResource = false;
+  public boolean useOnTargetBlank = false;
   public boolean clearCache = false;
   public String userAgent = "";
   public boolean javaScriptEnabled = true;
@@ -16,6 +20,7 @@ public class InAppWebViewOptions extends Options {
   public int textZoom = 100;
   public boolean verticalScrollBarEnabled = true;
   public boolean horizontalScrollBarEnabled = true;
+  public List<String> resourceCustomSchemes = new ArrayList<>();
 
   public boolean clearSessionCache = false;
   public boolean builtInZoomControls = false;

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/JavaScriptBridgeInterface.java

@@ -51,15 +51,17 @@ public class JavaScriptBridgeInterface {
         getChannel().invokeMethod("onCallJsHandler", obj, new MethodChannel.Result() {
           @Override
           public void success(Object json) {
-            if (flutterWebView.webView == null) {
+            InAppWebView webView = (inAppBrowserActivity != null) ? inAppBrowserActivity.webView : flutterWebView.webView;
+
+            if (webView == null) {
               // The webview has already been disposed, ignore.
               return;
             }
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
-              flutterWebView.webView.evaluateJavascript("window." + name + "[" + _callHandlerID + "](" + json + "); delete window." + name + "[" + _callHandlerID + "];", null);
+              webView.evaluateJavascript("window." + name + "[" + _callHandlerID + "](" + json + "); delete window." + name + "[" + _callHandlerID + "];", null);
             }
             else {
-              flutterWebView.webView.loadUrl("javascript:window." + name + "[" + _callHandlerID + "](" + json + "); delete window." + name + "[" + _callHandlerID + "];");
+              webView.loadUrl("javascript:window." + name + "[" + _callHandlerID + "](" + json + "); delete window." + name + "[" + _callHandlerID + "];");
             }
           }
 
@@ -79,6 +81,6 @@ public class JavaScriptBridgeInterface {
   }
 
   private MethodChannel getChannel() {
-    return (inAppBrowserActivity != null) ? InAppBrowserFlutterPlugin.channel : flutterWebView.channel;
+    return (inAppBrowserActivity != null) ? InAppBrowserFlutterPlugin.instance.channel : flutterWebView.channel;
   }
 }

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/Util.java

 package com.pichillilorenzo.flutter_inappbrowser;
 
 import android.content.res.AssetManager;
+import android.os.Handler;
+import android.os.Looper;
+import android.util.Log;
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.util.HashMap;
+import java.util.Map;
+
+import io.flutter.plugin.common.MethodChannel;
 import io.flutter.plugin.common.PluginRegistry;
 
 public class Util {
@@ -37,4 +44,53 @@ public class Util {
     return ANDROID_ASSET_URL + key;
   }
 
+    public static WaitFlutterResult invokeMethodAndWait(final MethodChannel channel, final String method, final Object arguments) {
+      final Map<String, Object> flutterResultMap = new HashMap<>();
+      flutterResultMap.put("result", null);
+      flutterResultMap.put("error", null);
+      flutterResultMap.put("isBlocking", true);
+
+      Handler handler = new Handler(Looper.getMainLooper());
+      handler.post(new Runnable() {
+        @Override
+        public void run() {
+          channel.invokeMethod(method, arguments, new MethodChannel.Result() {
+            @Override
+            public void success(Object result) {
+              flutterResultMap.put("result", result);
+              flutterResultMap.put("isBlocking", false);
+            }
+
+            @Override
+            public void error(String s, String s1, Object o) {
+              flutterResultMap.put("error", "ERROR: " + s + " " + s1);
+              flutterResultMap.put("result", o);
+              flutterResultMap.put("isBlocking", false);
+            }
+
+            @Override
+            public void notImplemented() {
+              flutterResultMap.put("isBlocking", false);
+            }
+          });
+        }
+      });
+
+      while((Boolean) flutterResultMap.get("isBlocking")) {
+        // block until flutter side returns
+      }
+
+      return new WaitFlutterResult(flutterResultMap.get("result"), (String) flutterResultMap.get("error"));
+    }
+
+    public static class WaitFlutterResult {
+      public Object result;
+      public String error;
+
+      public WaitFlutterResult(Object r, String e) {
+        result = r;
+        error = e;
+      }
+
+    }
 }

example/android/app/src/main/AndroidManifest.xml

@@ -6,6 +6,8 @@
          to allow setting breakpoints, to provide hot reload, etc.
     -->
     <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
 
     <!-- io.flutter.app.FlutterApplication is an android.app.Application that
          calls FlutterMain.startInitialization(this); in its onCreate method.
@@ -13,7 +15,7 @@
          additional functionality it is fine to subclass or reimplement
          FlutterApplication and put your custom class here. -->
     <application
-        android:name="io.flutter.app.FlutterApplication"
+        android:name="com.pichillilorenzo.flutterwebviewexample.MyApplication"
         android:label="flutter_inappbrowser_example"
         android:icon="@mipmap/ic_launcher">
         <activity
@@ -35,5 +37,16 @@
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
+
+        <provider
+            android:name="vn.hunghd.flutterdownloader.DownloadedFileProvider"
+            android:authorities="${applicationId}.flutter_downloader.provider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/provider_paths"/>
+        </provider>
+
     </application>
 </manifest>

example/android/app/src/main/java/com/pichillilorenzo/flutterwebviewexample/MyApplication.java

+package com.pichillilorenzo.flutterwebviewexample;
+
+import io.flutter.app.FlutterApplication;
+import io.flutter.plugin.common.PluginRegistry;
+import io.flutter.plugins.GeneratedPluginRegistrant;
+
+public class MyApplication extends FlutterApplication implements PluginRegistry.PluginRegistrantCallback {
+    @Override
+    public void registerWith(PluginRegistry registry) {
+        GeneratedPluginRegistrant.registerWith(registry);
+    }
+}

example/assets/index.html

@@ -24,7 +24,7 @@
 
         <main role="main" class="inner cover">
             <h1 class="cover-heading">Inline WebView</h1>
-            <img src="images/flutter-logo.svg" alt="flutter logo">
+            <img src="my-special-custom-scheme://images/flutter-logo.svg" alt="flutter logo">
             <p class="lead">Cover is a one-page template for building simple and beautiful home pages. Download, edit the text, and add your own fullscreen background photo to make it your own.</p>
             <p class="lead">
                 <a href="#" class="btn btn-lg btn-secondary">Learn more</a>
@@ -33,7 +33,9 @@
 
         <footer class="mastfoot mt-auto">
             <div class="inner">
-                <p>Cover template for <a href="https://getbootstrap.com/">Bootstrap</a>, by <a href="https://twitter.com/mdo">@mdo</a>.</p>
+                <p>Cover template for <a target="_blank" href="https://getbootstrap.com/">Bootstrap</a>, by <a href="https://twitter.com/mdo">@mdo</a>.</p>
+                <p>Phone link example <a href="tel:1-408-555-5555">1-408-555-5555</a></p>
+                <p>Email link example <a href="mailto:example@gmail.com">example@gmail.com</a></p>
             </div>
         </footer>
     </div>

example/ios/Runner.xcodeproj/project.pbxproj

@@ -12,6 +12,7 @@
 		3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */ = {isa = PBXBuildFile; fileRef = 3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */; };
 		3B80C3941E831B6300D905FE /* App.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 3B80C3931E831B6300D905FE /* App.framework */; };
 		3B80C3951E831B6300D905FE /* App.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 3B80C3931E831B6300D905FE /* App.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
+		61FF730023634CA10069C557 /* libsqlite3.tbd in Frameworks */ = {isa = PBXBuildFile; fileRef = 61FF72FF23634CA10069C557 /* libsqlite3.tbd */; };
 		74858FAF1ED2DC5600515810 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 74858FAE1ED2DC5600515810 /* AppDelegate.swift */; };
 		9705A1C61CF904A100538489 /* Flutter.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 9740EEBA1CF902C7004384FC /* Flutter.framework */; };
 		9705A1C71CF904A300538489 /* Flutter.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 9740EEBA1CF902C7004384FC /* Flutter.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
@@ -40,6 +41,8 @@
 		1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GeneratedPluginRegistrant.m; sourceTree = "<group>"; };
 		3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AppFrameworkInfo.plist; path = Flutter/AppFrameworkInfo.plist; sourceTree = "<group>"; };
 		3B80C3931E831B6300D905FE /* App.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = App.framework; path = Flutter/App.framework; sourceTree = "<group>"; };
+		61FF72FF23634CA10069C557 /* libsqlite3.tbd */ = {isa = PBXFileReference; lastKnownFileType = "sourcecode.text-based-dylib-definition"; name = libsqlite3.tbd; path = usr/lib/libsqlite3.tbd; sourceTree = SDKROOT; };
+		61FF730123634DD10069C557 /* flutter_downloader.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = flutter_downloader.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		74858FAD1ED2DC5600515810 /* Runner-Bridging-Header.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "Runner-Bridging-Header.h"; sourceTree = "<group>"; };
 		74858FAE1ED2DC5600515810 /* AppDelegate.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		7AFA3C8E1D35360C0083082E /* Release.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = Release.xcconfig; path = Flutter/Release.xcconfig; sourceTree = "<group>"; };
@@ -61,6 +64,7 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				61FF730023634CA10069C557 /* libsqlite3.tbd in Frameworks */,
 				9705A1C61CF904A100538489 /* Flutter.framework in Frameworks */,
 				3B80C3941E831B6300D905FE /* App.framework in Frameworks */,
 				25A517508F43E58C47090625 /* Pods_Runner.framework in Frameworks */,
@@ -73,6 +77,8 @@
 		50BAF1DF19E018DDF2B149B9 /* Frameworks */ = {
 			isa = PBXGroup;
 			children = (
+				61FF730123634DD10069C557 /* flutter_downloader.framework */,
+				61FF72FF23634CA10069C557 /* libsqlite3.tbd */,
 				E8D91E403808A7540F18B75D /* Pods_Runner.framework */,
 			);
 			name = Frameworks;
@@ -180,6 +186,11 @@
 						CreatedOnToolsVersion = 7.3.1;
 						DevelopmentTeam = PFP8UV45Y6;
 						LastSwiftMigration = 1020;
+						SystemCapabilities = {
+							com.apple.BackgroundModes = {
+								enabled = 1;
+							};
+						};
 					};
 				};
 			};
@@ -257,12 +268,16 @@
 			inputPaths = (
 				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh",
 				"${PODS_ROOT}/../.symlinks/flutter/ios-release/Flutter.framework",
+				"${BUILT_PRODUCTS_DIR}/flutter_downloader/flutter_downloader.framework",
 				"${BUILT_PRODUCTS_DIR}/flutter_inappbrowser/flutter_inappbrowser.framework",
+				"${BUILT_PRODUCTS_DIR}/path_provider/path_provider.framework",
 			);
 			name = "[CP] Embed Pods Frameworks";
 			outputPaths = (
 				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/Flutter.framework",
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/flutter_downloader.framework",
 				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/flutter_inappbrowser.framework",
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/path_provider.framework",
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;

example/ios/Runner/AppDelegate.swift

 import UIKit
 import Flutter
+import flutter_downloader
 
 @UIApplicationMain
 @objc class AppDelegate: FlutterAppDelegate {
+
   override func application(
     _ application: UIApplication,
     didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
   ) -> Bool {
     GeneratedPluginRegistrant.register(with: self)
+    FlutterDownloaderPlugin.setPluginRegistrantCallback({(registry: FlutterPluginRegistry) in
+        
+    })
     return super.application(application, didFinishLaunchingWithOptions: launchOptions)
   }
 }

example/ios/Runner/Info.plist

@@ -4,11 +4,6 @@
 <dict>
 	<key></key>
 	<string></string>
-	<key>NSAppTransportSecurity</key>
-	<dict>
-		<key>NSAllowsLocalNetworking</key>
-		<true/>
-	</dict>
 	<key>CFBundleDevelopmentRegion</key>
 	<string>en</string>
 	<key>CFBundleExecutable</key>
@@ -29,6 +24,16 @@
 	<string>$(FLUTTER_BUILD_NUMBER)</string>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
+	<key>NSAppTransportSecurity</key>
+	<dict>
+		<key>NSAllowsLocalNetworking</key>
+		<true/>
+	</dict>
+	<key>UIBackgroundModes</key>
+	<array>
+		<string>fetch</string>
+		<string>remote-notification</string>
+	</array>
 	<key>UILaunchStoryboardName</key>
 	<string>LaunchScreen</string>
 	<key>UIMainStoryboardFile</key>
@@ -46,9 +51,9 @@
 		<string>UIInterfaceOrientationLandscapeLeft</string>
 		<string>UIInterfaceOrientationLandscapeRight</string>
 	</array>
-	<key>io.flutter.embedded_views_preview</key>
-    <true/>
 	<key>UIViewControllerBasedStatusBarAppearance</key>
 	<false/>
+	<key>io.flutter.embedded_views_preview</key>
+	<true/>
 </dict>
 </plist>

example/lib/inline_example.screen.dart

+import 'dart:convert';
+import 'dart:io';
+
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_inappbrowser/flutter_inappbrowser.dart';
+import 'package:flutter_downloader/flutter_downloader.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:flutter/services.dart' show rootBundle;
 
 class InlineExampleScreen extends StatefulWidget {
   @override
@@ -55,13 +62,15 @@ class _InlineExampleScreenState extends State<InlineExampleScreen> {
               BoxDecoration(border: Border.all(color: Colors.blueAccent)),
           child: InAppWebView(
             //initialUrl: "https://www.youtube.com/embed/M7lc1UVf-VE?playsinline=1",
-            initialUrl: "https://flutter.dev/",
-            //initialFile: "assets/index.html",
+            //initialUrl: "https://flutter.dev/",
+            initialFile: "assets/index.html",
             initialHeaders: {},
             initialOptions: {
               //"mediaPlaybackRequiresUserGesture": false,
               //"allowsInlineMediaPlayback": true,
-              //"useShouldOverrideUrlLoading": true,
+              "useShouldOverrideUrlLoading": true,
+              "useOnTargetBlank": true,
+              "resourceCustomSchemes": ["my-special-custom-scheme"],
               //"useOnLoadResource": true
             },
             onWebViewCreated: (InAppWebViewController controller) {
@@ -104,13 +113,34 @@ class _InlineExampleScreenState extends State<InlineExampleScreen> {
                   response.url);
             },
             onConsoleMessage: (InAppWebViewController controller, ConsoleMessage consoleMessage) {
-              print("""
-              console output:
-                sourceURL: ${consoleMessage.sourceURL}
-                lineNumber: ${consoleMessage.lineNumber}
-                message: ${consoleMessage.message}
-                messageLevel: ${consoleMessage.messageLevel}
-              """);
+//              print("""
+//              console output:
+//                sourceURL: ${consoleMessage.sourceURL}
+//                lineNumber: ${consoleMessage.lineNumber}
+//                message: ${consoleMessage.message}
+//                messageLevel: ${consoleMessage.messageLevel}
+//              """);
+            },
+            onDownloadStart: (InAppWebViewController controller, String url) async {
+              final taskId = await FlutterDownloader.enqueue(
+                url: url,
+                savedDir: await _findLocalPath(),
+                showNotification: true, // show download progress in status bar (for Android)
+                openFileFromNotification: true, // click on notification to open downloaded file (for Android)
+              );
+            },
+            onLoadResourceCustomScheme: (InAppWebViewController controller, String scheme, String url) async {
+              if (scheme == "my-special-custom-scheme") {
+                var bytes = await rootBundle.load("assets/" + url.replaceFirst("my-special-custom-scheme://", "", 0));
+                var asBase64 = base64.encode(bytes.buffer.asUint8List());
+                var response = new CustomSchemeResponse(asBase64, "image/svg+xml", "utf-8");
+                return response;
+              }
+              return null;
+            },
+            onTargetBlank: (InAppWebViewController controller, String url) {
+              print("target _blank: " + url);
+              controller.loadUrl(url);
             },
           ),
         ),
@@ -146,4 +176,11 @@ class _InlineExampleScreenState extends State<InlineExampleScreen> {
       ),
     ]));
   }
+
+  Future<String> _findLocalPath() async {
+    final directory = Platform.isAndroid
+        ? await getExternalStorageDirectory()
+        : await getApplicationDocumentsDirectory();
+    return directory.path;
+  }
 }

example/lib/main.dart

@@ -4,11 +4,13 @@ import 'package:flutter_inappbrowser/flutter_inappbrowser.dart';
 import 'package:flutter_inappbrowser_example/chrome_safari_example.screen.dart';
 import 'package:flutter_inappbrowser_example/inline_example.screen.dart';
 import 'package:flutter_inappbrowser_example/webview_example.screen.dart';
+import 'package:flutter_downloader/flutter_downloader.dart';
 
 // InAppLocalhostServer localhostServer = new InAppLocalhostServer();
 
 Future main() async {
   // await localhostServer.start();
+  await FlutterDownloader.initialize();
   runApp(new MyApp());
 }
 

example/lib/webview_example.screen.dart

@@ -67,6 +67,15 @@ class MyInappBrowser extends InAppBrowser {
    """);
  }
 
+ @override
+ void onDownloadStart(String url) {
+   print("Download of " + url);
+ }
+
+ @override
+ Future<CustomSchemeResponse> onLoadResourceCustomScheme(String scheme, String url) async {
+   print("custom scheme: " + scheme);
+ }
 }
 
 class WebviewExampleScreen extends StatefulWidget {
@@ -87,7 +96,7 @@ class _WebviewExampleScreenState extends State<WebviewExampleScreen> {
       child: new RaisedButton(
           onPressed: ()  {
             widget.browser.open(
-                url: "https://google.com",
+                url: "https://www.google.com/",
                 options: {
                   "useShouldOverrideUrlLoading": true,
                   "useOnLoadResource": true,

example/pubspec.yaml

@@ -19,6 +19,8 @@ dependencies:
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^0.1.2
+  flutter_downloader: ^1.3.2
+  path_provider: ^1.4.0
 
 dev_dependencies:
   flutter_test:

flutter_inappbrowser.iml

@@ -21,7 +21,6 @@
       <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/flutter_inappbrowser/example/.pub" />
       <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/flutter_inappbrowser/example/build" />
       <excludeFolder url="file://$MODULE_DIR$/example/ios/Flutter/App.framework/flutter_assets/packages" />
-      <excludeFolder url="file://$MODULE_DIR$/example/ios/Flutter/flutter_assets/packages" />
     </content>
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="library" name="Dart SDK" level="project" />

ios/Classes/CustomeSchemeHandler.swift

+//
+//  CustomeSchemeHandler.swift
+//  flutter_downloader
+//
+//  Created by Lorenzo Pichilli on 25/10/2019.
+//
+
+import Flutter
+import Foundation
+import WebKit
+
+@available(iOS 11.0, *)
+class CustomeSchemeHandler : NSObject, WKURLSchemeHandler {
+    func webView(_ webView: WKWebView, start urlSchemeTask: WKURLSchemeTask) {
+        let inAppWebView = webView as! InAppWebView
+        if let url = urlSchemeTask.request.url, let scheme = url.scheme {
+            inAppWebView.onLoadResourceCustomScheme(scheme: scheme, url: url.absoluteString, result: {(result) -> Void in
+                if result is FlutterError {
+                    print((result as! FlutterError).message)
+                }
+                else if (result as? NSObject) == FlutterMethodNotImplemented {}
+                else {
+                    let json: [String: String]
+                    if let r = result {
+                        json = r as! [String: String]
+                        let urlResponse = URLResponse(url: url, mimeType: json["content-type"], expectedContentLength: -1, textEncodingName: json["content-encoding"])
+                        let data = Data(base64Encoded: json["base64data"]!, options: .ignoreUnknownCharacters)
+                        urlSchemeTask.didReceive(urlResponse)
+                        urlSchemeTask.didReceive(data!)
+                        urlSchemeTask.didFinish()
+                    }
+                }
+            })
+        }
+    }
+    
+    func webView(_ webView: WKWebView, stop urlSchemeTask: WKURLSchemeTask) {
+        
+    }
+}

ios/Classes/FlutterWebViewFactory.swift

@@ -9,7 +9,7 @@ import Flutter
 import Foundation
 
 public class FlutterWebViewFactory: NSObject, FlutterPlatformViewFactory {
-    private weak var registrar: FlutterPluginRegistrar?
+    private var registrar: FlutterPluginRegistrar?
     
     init(registrar: FlutterPluginRegistrar?) {
         super.init()
@@ -22,7 +22,10 @@ public class FlutterWebViewFactory: NSObject, FlutterPlatformViewFactory {
     
     public func create(withFrame frame: CGRect, viewIdentifier viewId: Int64, arguments args: Any?) -> FlutterPlatformView {
         let arguments = args as? NSDictionary
-        let webviewController = FlutterWebViewController(registrar: registrar!, withFrame: frame, viewIdentifier: viewId, arguments: arguments!)
+        let webviewController = FlutterWebViewController(registrar: registrar!,
+                                                         withFrame: frame,
+                                                         viewIdentifier: viewId,
+                                                         arguments: arguments!)
         return webviewController
     }
 }

ios/Classes/InAppWebViewOptions.swift

@@ -12,6 +12,7 @@ public class InAppWebViewOptions: Options {
     
     var useShouldOverrideUrlLoading = false
     var useOnLoadResource = false
+    var useOnTargetBlank = false
     var clearCache = false
     var userAgent = ""
     var javaScriptEnabled = true
@@ -19,6 +20,7 @@ public class InAppWebViewOptions: Options {
     var mediaPlaybackRequiresUserGesture = true
     var verticalScrollBarEnabled = true
     var horizontalScrollBarEnabled = true
+    var resourceCustomSchemes: [String] = []
     
     var disallowOverScroll = false
     var enableViewportScale = false

ios/Classes/SwiftFlutterPlugin.swift

@@ -35,8 +35,9 @@ extension Dictionary where Key: ExpressibleByStringLiteral {
 
 public class SwiftFlutterPlugin: NSObject, FlutterPlugin {
     
-    static var registrar: FlutterPluginRegistrar?
-    static var channel: FlutterMethodChannel?
+    static var instance: SwiftFlutterPlugin?
+    var registrar: FlutterPluginRegistrar?
+    var channel: FlutterMethodChannel?
     
     var webViewControllers: [String: InAppBrowserWebViewController?] = [:]
     var safariViewControllers: [String: Any?] = [:]
@@ -45,17 +46,14 @@ public class SwiftFlutterPlugin: NSObject, FlutterPlugin {
     private var previousStatusBarStyle = -1
     
     public init(with registrar: FlutterPluginRegistrar) {
-        SwiftFlutterPlugin.channel = FlutterMethodChannel(name: "com.pichillilorenzo/flutter_inappbrowser", binaryMessenger: registrar.messenger())
+        super.init()
+        self.registrar = registrar
+        self.channel = FlutterMethodChannel(name: "com.pichillilorenzo/flutter_inappbrowser", binaryMessenger: registrar.messenger())
+        registrar.addMethodCallDelegate(self, channel: channel!)
     }
     
     public static func register(with registrar: FlutterPluginRegistrar) {
-        
-        SwiftFlutterPlugin.registrar = registrar
-        
-        let channel = FlutterMethodChannel(name: "com.pichillilorenzo/flutter_inappbrowser", binaryMessenger: registrar.messenger())
-        let instance = SwiftFlutterPlugin(with: registrar)
-        registrar.addMethodCallDelegate(instance, channel: channel)
-        
+        SwiftFlutterPlugin.instance = SwiftFlutterPlugin(with: registrar)
         registrar.register(FlutterWebViewFactory(registrar: registrar) as FlutterPlatformViewFactory, withId: "com.pichillilorenzo/flutter_inappwebview")
         
         if #available(iOS 11.0, *) {
@@ -288,7 +286,7 @@ public class SwiftFlutterPlugin: NSObject, FlutterPlugin {
                 var openWithSystemBrowser = (arguments["openWithSystemBrowser"] as? Bool)!
                 
                 if isLocalFile {
-                    let key = SwiftFlutterPlugin.registrar!.lookupKey(forAsset: url)
+                    let key = self.registrar!.lookupKey(forAsset: url)
                     let assetURL = Bundle.main.url(forResource: key, withExtension: nil)
                     if assetURL == nil {
                         result(FlutterError(code: "InAppBrowserFlutterPlugin", message: url + " asset file cannot be found!", details: nil))
@@ -677,28 +675,28 @@ public class SwiftFlutterPlugin: NSObject, FlutterPlugin {
     
     func onBrowserCreated(uuid: String, webView: WKWebView) {
         if let webViewController = self.webViewControllers[uuid] {
-            SwiftFlutterPlugin.channel!.invokeMethod("onBrowserCreated", arguments: ["uuid": uuid])
+            self.channel!.invokeMethod("onBrowserCreated", arguments: ["uuid": uuid])
         }
     }
     
     func onExit(uuid: String) {
-        SwiftFlutterPlugin.channel!.invokeMethod("onExit", arguments: ["uuid": uuid])
+        self.channel!.invokeMethod("onExit", arguments: ["uuid": uuid])
     }
     
     func onChromeSafariBrowserOpened(uuid: String) {
         if self.safariViewControllers[uuid] != nil {
-            SwiftFlutterPlugin.channel!.invokeMethod("onChromeSafariBrowserOpened", arguments: ["uuid": uuid])
+            self.channel!.invokeMethod("onChromeSafariBrowserOpened", arguments: ["uuid": uuid])
         }
     }
     
     func onChromeSafariBrowserLoaded(uuid: String) {
         if self.safariViewControllers[uuid] != nil {
-            SwiftFlutterPlugin.channel!.invokeMethod("onChromeSafariBrowserLoaded", arguments: ["uuid": uuid])
+            self.channel!.invokeMethod("onChromeSafariBrowserLoaded", arguments: ["uuid": uuid])
         }
     }
     
     func onChromeSafariBrowserClosed(uuid: String) {
-        SwiftFlutterPlugin.channel!.invokeMethod("onChromeSafariBrowserClosed", arguments: ["uuid": uuid])
+        self.channel!.invokeMethod("onChromeSafariBrowserClosed", arguments: ["uuid": uuid])
     }
     
     func safariExit(uuid: String) {

lib/src/channel_manager.dart

+import 'dart:collection';
+
+import 'package:flutter/services.dart';
+
+import 'types.dart' show ListenerCallback;
+
+class ChannelManager {
+  static const MethodChannel channel = const MethodChannel('com.pichillilorenzo/flutter_inappbrowser');
+  static bool initialized = false;
+  static final listeners = HashMap<String, ListenerCallback>();
+
+  static Future<dynamic> _handleMethod(MethodCall call) async {
+    String uuid = call.arguments["uuid"];
+    return await listeners[uuid](call);
+  }
+
+  static void addListener(String key, ListenerCallback callback) {
+    if (!initialized)
+      init();
+    listeners.putIfAbsent(key, () => callback);
+  }
+
+  static void init () {
+    channel.setMethodCallHandler(_handleMethod);
+    initialized = true;
+  }
+}
\ No newline at end of file

lib/src/chrome_safari_browser.dart

+import 'dart:async';
+
+import 'package:flutter/services.dart';
+
+import 'types.dart';
+import 'channel_manager.dart';
+import 'in_app_browser.dart';
+
+///ChromeSafariBrowser class.
+///
+///This class uses native [Chrome Custom Tabs](https://developer.android.com/reference/android/support/customtabs/package-summary) on Android
+///and [SFSafariViewController](https://developer.apple.com/documentation/safariservices/sfsafariviewcontroller) on iOS.
+///
+///[browserFallback] represents the [InAppBrowser] instance fallback in case [Chrome Custom Tabs]/[SFSafariViewController] is not available.
+class ChromeSafariBrowser {
+  String uuid;
+  InAppBrowser browserFallback;
+  bool _isOpened = false;
+
+  ///Initialize the [ChromeSafariBrowser] instance with an [InAppBrowser] fallback instance or `null`.
+  ChromeSafariBrowser (bf) {
+    uuid = uuidGenerator.v4();
+    browserFallback = bf;
+    ChannelManager.addListener(uuid, handleMethod);
+    _isOpened = false;
+  }
+
+  Future<dynamic> handleMethod(MethodCall call) async {
+    switch(call.method) {
+      case "onChromeSafariBrowserOpened":
+        onOpened();
+        break;
+      case "onChromeSafariBrowserLoaded":
+        onLoaded();
+        break;
+      case "onChromeSafariBrowserClosed":
+        onClosed();
+        this._isOpened = false;
+        break;
+      default:
+        throw UnimplementedError("Unimplemented ${call.method} method");
+    }
+  }
+
+  ///Opens an [url] in a new [ChromeSafariBrowser] instance.
+  ///
+  ///- [url]: The [url] to load. Call [encodeUriComponent()] on this if the [url] contains Unicode characters.
+  ///
+  ///- [options]: Options for the [ChromeSafariBrowser].
+  ///
+  ///- [headersFallback]: The additional header of the [InAppBrowser] instance fallback to be used in the HTTP request for this URL, specified as a map from name to value.
+  ///
+  ///- [optionsFallback]: Options used by the [InAppBrowser] instance fallback.
+  ///
+  ///**Android** supports these options:
+  ///
+  ///- __addShareButton__: Set to `false` if you don't want the default share button. The default value is `true`.
+  ///- __showTitle__: Set to `false` if the title shouldn't be shown in the custom tab. The default value is `true`.
+  ///- __toolbarBackgroundColor__: Set the custom background color of the toolbar.
+  ///- __enableUrlBarHiding__: Set to `true` to enable the url bar to hide as the user scrolls down on the page. The default value is `false`.
+  ///- __instantAppsEnabled__: Set to `true` to enable Instant Apps. The default value is `false`.
+  ///
+  ///**iOS** supports these options:
+  ///
+  ///- __entersReaderIfAvailable__: Set to `true` if Reader mode should be entered automatically when it is available for the webpage. The default value is `false`.
+  ///- __barCollapsingEnabled__: Set to `true` to enable bar collapsing. The default value is `false`.
+  ///- __dismissButtonStyle__: Set the custom style for the dismiss button. The default value is `0 //done`. See [SFSafariViewController.DismissButtonStyle](https://developer.apple.com/documentation/safariservices/sfsafariviewcontroller/dismissbuttonstyle) for all the available styles.
+  ///- __preferredBarTintColor__: Set the custom background color of the navigation bar and the toolbar.
+  ///- __preferredControlTintColor__: Set the custom color of the control buttons on the navigation bar and the toolbar.
+  ///- __presentationStyle__: Set the custom modal presentation style when presenting the WebView. The default value is `0 //fullscreen`. See [UIModalPresentationStyle](https://developer.apple.com/documentation/uikit/uimodalpresentationstyle) for all the available styles.
+  ///- __transitionStyle__: Set to the custom transition style when presenting the WebView. The default value is `0 //crossDissolve`. See [UIModalTransitionStyle](https://developer.apple.com/documentation/uikit/uimodaltransitionStyle) for all the available styles.
+  Future<void> open(String url, {Map<String, dynamic> options = const {}, Map<String, String> headersFallback = const {}, Map<String, dynamic> optionsFallback = const {}}) async {
+    assert(url != null && url.isNotEmpty);
+    this.throwIsAlreadyOpened(message: 'Cannot open $url!');
+    Map<String, dynamic> args = <String, dynamic>{};
+    args.putIfAbsent('uuid', () => uuid);
+    args.putIfAbsent('uuidFallback', () => (browserFallback != null) ? browserFallback.uuid : '');
+    args.putIfAbsent('url', () => url);
+    args.putIfAbsent('headers', () => headersFallback);
+    args.putIfAbsent('options', () => options);
+    args.putIfAbsent('optionsFallback', () => optionsFallback);
+    args.putIfAbsent('isData', () => false);
+    args.putIfAbsent('useChromeSafariBrowser', () => true);
+    await ChannelManager.channel.invokeMethod('open', args);
+    this._isOpened = true;
+  }
+
+  ///Event fires when the [ChromeSafariBrowser] is opened.
+  void onOpened() {
+
+  }
+
+  ///Event fires when the [ChromeSafariBrowser] is loaded.
+  void onLoaded() {
+
+  }
+
+  ///Event fires when the [ChromeSafariBrowser] is closed.
+  void onClosed() {
+
+  }
+
+  bool isOpened() {
+    return this._isOpened;
+  }
+
+  void throwIsAlreadyOpened({String message = ''}) {
+    if (this.isOpened()) {
+      throw Exception(['Error: ${ (message.isEmpty) ? '' : message + ' '}The browser is already opened.']);
+    }
+  }
+
+  void throwIsNotOpened({String message = ''}) {
+    if (!this.isOpened()) {
+      throw Exception(['Error: ${ (message.isEmpty) ? '' : message + ' '}The browser is not opened.']);
+    }
+  }
+}
\ No newline at end of file

lib/src/cookie_manager.dart

+import 'package:flutter/services.dart';
+
+///Manages the cookies used by WebView instances.
+///
+///**NOTE for iOS**: available from iOS 11.0+.
+class CookieManager {
+  static bool _initialized = false;
+  static const MethodChannel _channel = const MethodChannel('com.pichillilorenzo/flutter_inappbrowser_cookiemanager');
+
+  static void _init () {
+    _channel.setMethodCallHandler(handleMethod);
+    _initialized = true;
+  }
+
+  static Future<dynamic> handleMethod(MethodCall call) async {
+  }
+
+  ///Sets a cookie for the given [url]. Any existing cookie with the same [host], [path] and [name] will be replaced with the new cookie. The cookie being set will be ignored if it is expired.
+  ///
+  ///The default value of [path] is `"/"`.
+  ///If [domain] is `null`, its default value will be the domain name of [url].
+  static Future<void> setCookie(String url, String name, String value,
+      { String domain,
+        String path = "/",
+        int expiresDate,
+        int maxAge,
+        bool isSecure }) async {
+    if (!_initialized)
+      _init();
+
+    if (domain == null)
+      domain = getDomainName(url);
+
+    assert(url != null && url.isNotEmpty);
+    assert(name != null && name.isNotEmpty);
+    assert(value != null && value.isNotEmpty);
+    assert(domain != null && domain.isNotEmpty);
+    assert(path != null && path.isNotEmpty);
+
+    Map<String, dynamic> args = <String, dynamic>{};
+    args.putIfAbsent('url', () => url);
+    args.putIfAbsent('name', () => name);
+    args.putIfAbsent('value', () => value);
+    args.putIfAbsent('domain', () => domain);
+    args.putIfAbsent('path', () => path);
+    args.putIfAbsent('expiresDate', () => expiresDate?.toString());
+    args.putIfAbsent('maxAge', () => maxAge);
+    args.putIfAbsent('isSecure', () => isSecure);
+
+    await _channel.invokeMethod('setCookie', args);
+  }
+
+  ///Gets all the cookies for the given [url].
+  static Future<List<Map<String, dynamic>>> getCookies(String url) async {
+    if (!_initialized)
+      _init();
+
+    assert(url != null && url.isNotEmpty);
+
+    Map<String, dynamic> args = <String, dynamic>{};
+    args.putIfAbsent('url', () => url);
+    List<dynamic> cookies = await _channel.invokeMethod('getCookies', args);
+    cookies = cookies.cast<Map<dynamic, dynamic>>();
+    for(var i = 0; i < cookies.length; i++) {
+      cookies[i] = cookies[i].cast<String, dynamic>();
+    }
+    cookies = cookies.cast<Map<String, dynamic>>();
+    return cookies;
+  }
+
+  ///Gets a cookie by its [name] for the given [url].
+  static Future<Map<String, dynamic>> getCookie(String url, String name) async {
+    if (!_initialized)
+      _init();
+
+    assert(url != null && url.isNotEmpty);
+    assert(name != null && name.isNotEmpty);
+
+    Map<String, dynamic> args = <String, dynamic>{};
+    args.putIfAbsent('url', () => url);
+    List<dynamic> cookies = await _channel.invokeMethod('getCookies', args);
+    cookies = cookies.cast<Map<dynamic, dynamic>>();
+    for(var i = 0; i < cookies.length; i++) {
+      cookies[i] = cookies[i].cast<String, dynamic>();
+      if (cookies[i]["name"] == name)
+        return cookies[i];
+    }
+    return null;
+  }
+
+  ///Removes a cookie by its [name] for the given [url], [domain] and [path].
+  ///
+  ///The default value of [path] is `"/"`.
+  ///If [domain] is `null` or empty, its default value will be the domain name of [url].
+  static Future<void> deleteCookie(String url, String name, {String domain = "", String path = "/"}) async {
+    if (!_initialized)
+      _init();
+
+    if (domain == null || domain.isEmpty)
+      domain = getDomainName(url);
+
+    assert(url != null && url.isNotEmpty);
+    assert(name != null && name.isNotEmpty);
+    assert(domain != null && url.isNotEmpty);
+    assert(path != null && url.isNotEmpty);
+
+    Map<String, dynamic> args = <String, dynamic>{};
+    args.putIfAbsent('url', () => url);
+    args.putIfAbsent('name', () => name);
+    args.putIfAbsent('domain', () => domain);
+    args.putIfAbsent('path', () => path);
+    await _channel.invokeMethod('deleteCookie', args);
+  }
+
+  ///Removes all cookies for the given [url], [domain] and [path].
+  ///
+  ///The default value of [path] is `"/"`.
+  ///If [domain] is `null` or empty, its default value will be the domain name of [url].
+  static Future<void> deleteCookies(String url, {String domain = "", String path = "/"}) async {
+    if (!_initialized)
+      _init();
+
+    if (domain == null || domain.isEmpty)
+      domain = getDomainName(url);
+
+    assert(url != null && url.isNotEmpty);
+    assert(domain != null && url.isNotEmpty);
+    assert(path != null && url.isNotEmpty);
+
+    Map<String, dynamic> args = <String, dynamic>{};
+    args.putIfAbsent('url', () => url);
+    args.putIfAbsent('domain', () => domain);
+    args.putIfAbsent('path', () => path);
+    await _channel.invokeMethod('deleteCookies', args);
+  }
+
+  ///Removes all cookies.
+  static Future<void> deleteAllCookies() async {
+    if (!_initialized)
+      _init();
+
+    Map<String, dynamic> args = <String, dynamic>{};
+    await _channel.invokeMethod('deleteAllCookies', args);
+  }
+
+  static String getDomainName(String url) {
+    Uri uri = Uri.parse(url);
+    String domain = uri.host;
+    if (domain == null)
+      return "";
+    return domain.startsWith("www.") ? domain.substring(4) : domain;
+  }
+}
\ No newline at end of file

lib/src/in_app_localhost_server.dart

+import 'dart:io';
+import 'dart:async';
+
+import 'package:flutter/services.dart' show rootBundle;
+import 'package:mime/mime.dart';
+
+///InAppLocalhostServer class.
+///
+///This class allows you to create a simple server on `http://localhost:[port]/` in order to be able to load your assets file on a server. The default [port] value is `8080`.
+class InAppLocalhostServer {
+
+  HttpServer _server;
+  int _port = 8080;
+
+  InAppLocalhostServer({int port = 8080}) {
+    this._port = port;
+  }
+
+  ///Starts a server on http://localhost:[port]/.
+  ///
+  ///**NOTE for iOS**: For the iOS Platform, you need to add the `NSAllowsLocalNetworking` key with `true` in the `Info.plist` file (See [ATS Configuration Basics](https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html#//apple_ref/doc/uid/TP40009251-SW35)):
+  ///```xml
+  ///<key>NSAppTransportSecurity</key>
+  ///<dict>
+  ///    <key>NSAllowsLocalNetworking</key>
+  ///    <true/>
+  ///</dict>
+  ///```
+  ///The `NSAllowsLocalNetworking` key is available since **iOS 10**.
+  Future<void> start() async {
+
+    if (this._server != null) {
+      throw Exception('Server already started on http://localhost:$_port');
+    }
+
+    var completer = new Completer();
+
+    runZoned(() {
+      HttpServer.bind('127.0.0.1', _port).then((server) {
+        print('Server running on http://localhost:' + _port.toString());
+
+        this._server = server;
+
+        server.listen((HttpRequest request) async {
+          var body = List<int>();
+          var path = request.requestedUri.path;
+          path = (path.startsWith('/')) ? path.substring(1) : path;
+          path += (path.endsWith('/')) ? 'index.html' : '';
+
+          try {
+            body = (await rootBundle.load(path))
+                .buffer.asUint8List();
+          } catch (e) {
+            print(e.toString());
+            request.response.close();
+            return;
+          }
+
+          var contentType = ['text', 'html'];
+          if (!request.requestedUri.path.endsWith('/') && request.requestedUri.pathSegments.isNotEmpty) {
+            var mimeType = lookupMimeType(request.requestedUri.path, headerBytes: body);
+            if (mimeType != null) {
+              contentType = mimeType.split('/');
+            }
+          }
+
+          request.response.headers.contentType = new ContentType(contentType[0], contentType[1], charset: 'utf-8');
+          request.response.add(body);
+          request.response.close();
+        });
+
+        completer.complete();
+      });
+    }, onError: (e, stackTrace) => print('Error: $e $stackTrace'));
+
+    return completer.future;
+  }
+
+  ///Closes the server.
+  Future<void> close() async {
+    if (this._server != null) {
+      await this._server.close(force: true);
+      print('Server running on http://localhost:$_port closed');
+      this._server = null;
+    }
+  }
+
+}
\ No newline at end of file

lib/src/types.dart

+import 'dart:typed_data';
+
+import 'package:uuid/uuid.dart';
+import 'package:flutter/services.dart';
+import 'in_app_webview.dart' show InAppWebViewController;
+
+var uuidGenerator = new Uuid();
+
+typedef Future<dynamic> ListenerCallback(MethodCall call);
+
+///This type represents a callback, added with [addJavaScriptHandler], that listens to post messages sent from JavaScript.
+///
+///The Android implementation uses [addJavascriptInterface](https://developer.android.com/reference/android/webkit/WebView#addJavascriptInterface(java.lang.Object,%20java.lang.String)).
+///The iOS implementation uses [addScriptMessageHandler](https://developer.apple.com/documentation/webkit/wkusercontentcontroller/1537172-addscriptmessagehandler?language=objc)
+///
+///The JavaScript function that can be used to call the handler is `window.flutter_inappbrowser.callHandler(handlerName <String>, ...args);`, where `args` are [rest parameters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters).
+///The `args` will be stringified automatically using `JSON.stringify(args)` method and then they will be decoded on the Dart side.
+///
+///Also, a [JavaScriptHandlerCallback] can return json data to the JavaScript side.
+///In this case, simply return data that you want to send and it will be automatically json encoded using [jsonEncode] from the `dart:convert` library.
+typedef dynamic JavaScriptHandlerCallback(List<dynamic> arguments);
+
+///Enum representing the level of a console message.
+enum ConsoleMessageLevel {
+  DEBUG, ERROR, LOG, TIP, WARNING
+}
+
+///Public class representing a resource request of the [InAppBrowser] WebView.
+///It is used by the method [InAppBrowser.onLoadResource()].
+class WebResourceRequest {
+
+  String url;
+  Map<String, String> headers;
+  String method;
+
+  WebResourceRequest(this.url, this.headers, this.method);
+
+}
+
+///Public class representing a resource response of the [InAppBrowser] WebView.
+///It is used by the method [InAppBrowser.onLoadResource()].
+class WebResourceResponse {
+
+  String url;
+  Map<String, String> headers;
+  int statusCode;
+  int startTime;
+  int duration;
+  Uint8List data;
+
+  WebResourceResponse(this.url, this.headers, this.statusCode, this.startTime, this.duration, this.data);
+
+}
+
+///Public class representing the response returned by the [onLoadResourceCustomScheme()] event of [InAppWebView].
+///It allows to load a specific resource. The resource data must be encoded to `base64`.
+class CustomSchemeResponse {
+  String base64data;
+  String contentType;
+  String contentEnconding;
+
+  CustomSchemeResponse(this.base64data, this.contentType, this.contentEnconding);
+
+  Map<String, dynamic> toJson() {
+    return {
+      'content-type': this.contentType,
+      'content-encoding': this.contentEnconding,
+      'base64data': this.base64data
+    };
+  }
+}
+
+///Public class representing a JavaScript console message from WebCore.
+///This could be a issued by a call to one of the console logging functions (e.g. console.log('...')) or a JavaScript error on the page.
+///
+///To receive notifications of these messages, override the [InAppBrowser.onConsoleMessage()] function.
+class ConsoleMessage {
+
+  String sourceURL = "";
+  int lineNumber = 1;
+  String message = "";
+  ConsoleMessageLevel messageLevel = ConsoleMessageLevel.LOG;
+
+  ConsoleMessage(this.sourceURL, this.lineNumber, this.message, this.messageLevel);
+}
+
+typedef onWebViewCreatedCallback = void Function(InAppWebViewController controller);
+typedef onWebViewLoadStartCallback = void Function(InAppWebViewController controller, String url);
+typedef onWebViewLoadStopCallback = void Function(InAppWebViewController controller, String url);
+typedef onWebViewLoadErrorCallback = void Function(InAppWebViewController controller, String url, int code, String message);
+typedef onWebViewProgressChangedCallback = void Function(InAppWebViewController controller, int progress);
+typedef onWebViewConsoleMessageCallback = void Function(InAppWebViewController controller, ConsoleMessage consoleMessage);
+typedef shouldOverrideUrlLoadingCallback = void Function(InAppWebViewController controller, String url);
+typedef onWebViewLoadResourceCallback = void Function(InAppWebViewController controller, WebResourceResponse response, WebResourceRequest request);
+typedef onWebViewScrollChangedCallback = void Function(InAppWebViewController controller, int x, int y);
+typedef onDownloadStartCallback = void Function(InAppWebViewController controller, String url);
+typedef onLoadResourceCustomSchemeCallback = Future<CustomSchemeResponse> Function(InAppWebViewController controller, String scheme, String url);
+typedef onTargetBlankCallback = void Function(InAppWebViewController controller, String url);
\ No newline at end of file

lib/src/web_history.dart

+///WebHistory class.
+///
+///This class contains a snapshot of the current back/forward list for a WebView.
+class WebHistory {
+  List<WebHistoryItem> _list;
+  ///List of all [WebHistoryItem]s.
+  List<WebHistoryItem> get list => _list;
+  ///Index of the current [WebHistoryItem].
+  int currentIndex;
+
+  WebHistory(this._list, this.currentIndex);
+}
+
+///WebHistoryItem class.
+///
+///A convenience class for accessing fields in an entry in the back/forward list of a WebView. Each WebHistoryItem is a snapshot of the requested history item.
+class WebHistoryItem {
+  ///Original url of this history item.
+  String originalUrl;
+  ///Document title of this history item.
+  String title;
+  ///Url of this history item.
+  String url;
+  ///0-based position index in the back-forward [WebHistory.list].
+  int index;
+  ///Position offset respect to the currentIndex of the back-forward [WebHistory.list].
+  int offset;
+
+  WebHistoryItem(this.originalUrl, this.title, this.url, this.index, this.offset);
+}
\ No newline at end of file