canGoBack getOp onLoadError StatefulWidget onLoadResource useShouldOverrideUrlLoading ): InAppLocalhostServer local openWithSystemBrowser __userAgent__ a InApp A [InApp A `InApp assets Ui postUrl assert( sNotEmpty() loadData _valide initialized HashMap headers .cast WebView print throw InAppWeb activity.getPreferences(0) Log. com.pichillilorenzo.flutter_inappbrowser flutter_inappbrowser $PROJECT_DIR$/example/android 1536836356751 1536836356751 Android 1.8 flutter_inappbrowser_android Dart SDK