1. Enable setTextZoom function of Android-WebViewSetting

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

@@ -181,12 +181,7 @@ public class InAppWebView extends WebView {
     settings.setUseWideViewPort(options.useWideViewPort);
     settings.setSupportZoom(options.supportZoom);
 
-    // fix webview scaling
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT)
-      settings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.TEXT_AUTOSIZING);
-    else
-      settings.setTextZoom(100);
-
+    settings.setTextZoom(options.textZoom);
   }
 
   public void loadUrl(String url, MethodChannel.Result result) {
@@ -337,6 +332,9 @@ public class InAppWebView extends WebView {
     if (newOptionsMap.get("supportZoom") != null && options.supportZoom != newOptions.supportZoom)
       settings.setSupportZoom(newOptions.supportZoom);
 
+    if (newOptionsMap.get("textZoom") != null && options.textZoom != newOptions.textZoom)
+      settings.setTextZoom(newOptions.textZoom);
+
     options = newOptions;
   }
 

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

@@ -21,4 +21,6 @@ public class InAppWebViewOptions extends Options {
   public boolean domStorageEnabled = false;
   public boolean useWideViewPort = true;
   public boolean safeBrowsingEnabled = true;
+
+  public int textZoom = 100;
 }