fix choose file callback in android

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

 package com.pichillilorenzo.flutter_inappbrowser.InAppWebView;
 
+import android.annotation.TargetApi;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.graphics.Bitmap;
@@ -33,7 +34,10 @@ import java.util.Map;
 import io.flutter.plugin.common.MethodChannel;
 import io.flutter.plugin.common.PluginRegistry;
 
-public class InAppWebChromeClient extends WebChromeClient {
+import static android.app.Activity.RESULT_CANCELED;
+import static android.app.Activity.RESULT_OK;
+
+public class InAppWebChromeClient extends WebChromeClient implements PluginRegistry.ActivityResultListener {
 
     protected static final String LOG_TAG = "IABWebChromeClient";
     private PluginRegistry.Registrar registrar;
@@ -56,18 +60,18 @@ public class InAppWebChromeClient extends WebChromeClient {
             this.inAppBrowserActivity = (InAppBrowserActivity) obj;
         else if (obj instanceof FlutterWebView)
             this.flutterWebView = (FlutterWebView) obj;
+
+        registrar.addActivityResultListener(this);
     }
 
-  public Bitmap getDefaultVideoPoster()
-  {
+    public Bitmap getDefaultVideoPoster() {
         if (mCustomView == null) {
             return null;
         }
         return BitmapFactory.decodeResource(this.registrar.activeContext().getResources(), 2130837573);
     }
 
-  public void onHideCustomView()
-  {
+    public void onHideCustomView() {
         View decorView = this.registrar.activity().getWindow().getDecorView();
         ((FrameLayout) decorView).removeView(this.mCustomView);
         this.mCustomView = null;
@@ -77,10 +81,8 @@ public class InAppWebChromeClient extends WebChromeClient {
         this.mCustomViewCallback = null;
     }
 
-  public void onShowCustomView(View paramView, WebChromeClient.CustomViewCallback paramCustomViewCallback)
-  {
-    if (this.mCustomView != null)
-    {
+    public void onShowCustomView(View paramView, WebChromeClient.CustomViewCallback paramCustomViewCallback) {
+        if (this.mCustomView != null) {
             onHideCustomView();
             return;
         }
@@ -343,7 +345,7 @@ public class InAppWebChromeClient extends WebChromeClient {
                 LinearLayout.LayoutParams.MATCH_PARENT);
         input.setLayoutParams(lp);
 
-    layout.setPaddingRelative(45,15,45,0);
+        layout.setPaddingRelative(45, 15, 45, 0);
         layout.addView(input);
 
         String alertMessage = (responseMessage != null && !responseMessage.isEmpty()) ? responseMessage : message;
@@ -392,8 +394,7 @@ public class InAppWebChromeClient extends WebChromeClient {
     }
 
     @Override
-  public boolean onCreateWindow(WebView view, boolean dialog, boolean userGesture, android.os.Message resultMsg)
-  {
+    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<>();
@@ -405,7 +406,7 @@ public class InAppWebChromeClient extends WebChromeClient {
     }
 
     @Override
-  public void onGeolocationPermissionsShowPrompt (final String origin, final GeolocationPermissions.Callback callback) {
+    public void onGeolocationPermissionsShowPrompt(final String origin, final GeolocationPermissions.Callback callback) {
         Map<String, Object> obj = new HashMap<>();
         if (inAppBrowserActivity != null)
             obj.put("uuid", inAppBrowserActivity.uuid);
@@ -415,19 +416,19 @@ public class InAppWebChromeClient extends WebChromeClient {
             public void success(Object o) {
                 Map<String, Object> response = (Map<String, Object>) o;
                 if (response != null)
-          callback.invoke((String) response.get("origin"),(Boolean) response.get("allow"),(Boolean) response.get("retain"));
+                    callback.invoke((String) response.get("origin"), (Boolean) response.get("allow"), (Boolean) response.get("retain"));
                 else
-          callback.invoke(origin,false,false);
+                    callback.invoke(origin, false, false);
             }
 
             @Override
             public void error(String s, String s1, Object o) {
-        callback.invoke(origin,false,false);
+                callback.invoke(origin, false, false);
             }
 
             @Override
             public void notImplemented() {
-        callback.invoke(origin,false,false);
+                callback.invoke(origin, false, false);
             }
         });
     }
@@ -518,10 +519,9 @@ public class InAppWebChromeClient extends WebChromeClient {
     public boolean onShowFileChooser(
             WebView webView, ValueCallback<Uri[]> filePathCallback,
             FileChooserParams fileChooserParams) {
-    if (mUploadMessageArray != null) {
-      mUploadMessageArray.onReceiveValue(null);
-    }
+        if (mUploadMessageArray == null) {
             mUploadMessageArray = filePathCallback;
+        }
 
         Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
         contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
@@ -540,4 +540,13 @@ public class InAppWebChromeClient extends WebChromeClient {
     private MethodChannel getChannel() {
         return (inAppBrowserActivity != null) ? InAppBrowserFlutterPlugin.inAppBrowser.channel : flutterWebView.channel;
     }
+
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    @Override
+    public boolean onActivityResult(int requestCode, int resultCode, Intent data) {
+        if (requestCode == FILECHOOSER_RESULTCODE && (resultCode == RESULT_OK || resultCode == RESULT_CANCELED)) {
+            mUploadMessageArray.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, data));
+        }
+        return false;
+    }
 }