Consider that browsers might not be supported by devices

flutter_inappwebview/example/integration_test/util.dart

@@ -169,6 +169,9 @@ class MyChromeSafariBrowser extends ChromeSafariBrowser {
  relationshipValidationResult.complete(result);
  }
 
+ @override
+ void onBrowserNotSupported() {}
+
  @override
  void onClosed() {
  closed.complete();

flutter_inappwebview/example/lib/chrome_safari_browser_example.screen.dart

@@ -20,6 +20,11 @@ class MyChromeSafariBrowser extends ChromeSafariBrowser {
  void onClosed() {
  print("ChromeSafari browser closed");
  }
+
+ @override
+ void onBrowserNotSupported() {
+ print("ChromeSafari is not supported");
+ }
 }
 
 class ChromeSafariBrowserExampleScreen extends StatefulWidget {

flutter_inappwebview/lib/src/chrome_safari_browser/chrome_safari_browser.dart

@@ -192,4 +192,7 @@ class ChromeSafariBrowser implements PlatformChromeSafariBrowserEvents {
 
  @override
  void onWillOpenInBrowser() {}
+
+ @override
+ void onBrowserNotSupported() {}
 }

flutter_inappwebview_android/android/src/main/java/com/pichillilorenzo/flutter_inappwebview_android/chrome_custom_tabs/ChromeCustomTabsActivity.java

@@ -114,9 +114,16 @@ protected void onCreate(Bundle savedInstanceState) {
  customTabActivityHelper.setConnectionCallback(new CustomTabActivityHelper.ConnectionCallback() {
  @Override
  public void onCustomTabsConnected() {
- customTabsConnected();
- if (channelDelegate != null) {
- channelDelegate.onServiceConnected();
+ try {
+ customTabsConnected();
+ if (channelDelegate != null) {
+ channelDelegate.onServiceConnected();
+ }
+ } catch (java.lang.Exception e) {
+ if (channelDelegate != null) {
+ channelDelegate.onBrowserNotSupported();
+ }
+ Log.d(LOG_TAG, "Custom Tabs not supported", e);
  }
  }
 
@@ -181,15 +188,15 @@ public void onRelationshipValidationResult(@CustomTabsService.Relation int relat
  public void launchUrl(@NonNull String url,
  @Nullable Map<String, String> headers,
  @Nullable String referrer,
- @Nullable List<String> otherLikelyURLs) {
+ @Nullable List<String> otherLikelyURLs) throws ClassNotFoundException {
  launchUrlWithSession(customTabsSession, url, headers, referrer, otherLikelyURLs);
  }
 
  public void launchUrlWithSession(@Nullable CustomTabsSession session,
  @NonNull String url,
  @Nullable Map<String, String> headers,
  @Nullable String referrer,
- @Nullable List<String> otherLikelyURLs) {
+ @Nullable List<String> otherLikelyURLs) throws ClassNotFoundException {
  mayLaunchUrl(url, otherLikelyURLs);
  builder = new CustomTabsIntent.Builder(session);
  prepareCustomTabs();

flutter_inappwebview_android/android/src/main/java/com/pichillilorenzo/flutter_inappwebview_android/chrome_custom_tabs/ChromeCustomTabsChannelDelegate.java

@@ -243,6 +243,13 @@ public void onSessionEnded(boolean didUserInteract) {
  channel.invokeMethod("onSessionEnded", obj);
  }
 
+ public void onBrowserNotSupported() {
+ MethodChannel channel = getChannel();
+ if (channel == null) return;
+ Map<String, Object> obj = new HashMap<>();
+ channel.invokeMethod("onBrowserNotSupported", obj);
+ }
+
  @Override
  public void dispose() {
  super.dispose();

flutter_inappwebview_android/android/src/main/java/com/pichillilorenzo/flutter_inappwebview_android/chrome_custom_tabs/ChromeSafariBrowserManager.java

@@ -55,7 +55,11 @@ public void onMethodCall(final MethodCall call, final MethodChannel.Result resul
  HashMap<String, Object> actionButton = (HashMap<String, Object>) call.argument("actionButton");
  HashMap<String, Object> secondaryToolbar = (HashMap<String, Object>) call.argument("secondaryToolbar");
  List<HashMap<String, Object>> menuItemList = (List<HashMap<String, Object>>) call.argument("menuItemList");
- open(plugin.activity, viewId, url, headers, referrer, otherLikelyURLs, settings, actionButton, secondaryToolbar, menuItemList, result);
+ try {
+ open(plugin.activity, viewId, url, headers, referrer, otherLikelyURLs, settings, actionButton, secondaryToolbar, menuItemList, result);
+ } catch (ClassNotFoundException e) {
+ result.error(LOG_TAG, e.getMessage(), null);
+ }
  } else {
  result.success(false);
  }

flutter_inappwebview_android/android/src/main/java/com/pichillilorenzo/flutter_inappwebview_android/chrome_custom_tabs/CustomTabActivityHelper.java

@@ -39,7 +39,7 @@ public static void openCustomTab(Activity activity,
  Uri uri,
  @Nullable Map<String, String> headers,
  @Nullable Uri referrer,
- int requestCode) {
+ int requestCode) throws ClassNotFoundException {
  intent.setData(uri);
  if (headers != null) {
  Bundle bundleHeaders = new Bundle();

flutter_inappwebview_android/android/src/main/java/com/pichillilorenzo/flutter_inappwebview_android/in_app_browser/InAppBrowserActivity.java

@@ -45,6 +45,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 
 import io.flutter.plugin.common.MethodChannel;
 
@@ -145,7 +146,11 @@ protected void onCreate(Bundle savedInstanceState) {
 
  actionBar = getSupportActionBar();
 
- prepareView();
+ try {
+ prepareView();
+ } catch (ClassNotFoundException e) {
+ Log.d(LOG_TAG, Objects.requireNonNull(e.getMessage()));
+ }
 
  if (windowId != -1) {
  if (webView.plugin != null && webView.plugin.inAppWebViewManager != null) {
@@ -187,7 +192,7 @@ else if (initialUrlRequest != null) {
  }
  }
 
- private void prepareView() {
+ private void prepareView() throws ClassNotFoundException {
 
  if (webView != null) {
  webView.prepare();
@@ -421,7 +426,7 @@ public void hide() {
  }
  }
 
- public void show() {
+ public void show() throws ClassNotFoundException {
  isHidden = false;
  Intent openActivity = new Intent(this, InAppBrowserActivity.class);
  openActivity.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
@@ -451,7 +456,7 @@ public void closeButtonClicked(MenuItem item) {
  close(null);
  }
 
- public void setSettings(InAppBrowserSettings newSettings, HashMap<String, Object> newSettingsMap) {
+ public void setSettings(InAppBrowserSettings newSettings, HashMap<String, Object> newSettingsMap) throws ClassNotFoundException {
 
  InAppWebViewSettings newInAppWebViewSettings = new InAppWebViewSettings();
  newInAppWebViewSettings.parse(newSettingsMap);

flutter_inappwebview_android/android/src/main/java/com/pichillilorenzo/flutter_inappwebview_android/webview/WebViewChannelDelegate.java

@@ -219,7 +219,11 @@ public void onReceiveValue(String value) {
  InAppBrowserSettings inAppBrowserSettings = new InAppBrowserSettings();
  HashMap<String, Object> inAppBrowserSettingsMap = (HashMap<String, Object>) call.argument("settings");
  inAppBrowserSettings.parse(inAppBrowserSettingsMap);
- inAppBrowserActivity.setSettings(inAppBrowserSettings, inAppBrowserSettingsMap);
+ try {
+ inAppBrowserActivity.setSettings(inAppBrowserSettings, inAppBrowserSettingsMap);
+ } catch (ClassNotFoundException e) {
+ result.error(LOG_TAG, e.getMessage(), null);
+ }
  } else if (webView != null) {
  InAppWebViewSettings inAppWebViewSettings = new InAppWebViewSettings();
  HashMap<String, Object> inAppWebViewSettingsMap = (HashMap<String, Object>) call.argument("settings");
@@ -247,7 +251,11 @@ public void onReceiveValue(String value) {
  case show:
  if (webView != null && webView.getInAppBrowserDelegate() instanceof InAppBrowserActivity) {
  InAppBrowserActivity inAppBrowserActivity = (InAppBrowserActivity) webView.getInAppBrowserDelegate();
- inAppBrowserActivity.show();
+ try {
+ inAppBrowserActivity.show();
+ } catch (ClassNotFoundException e) {
+ result.error(LOG_TAG, e.getMessage(), null);
+ }
  result.success(true);
  } else {
  result.notImplemented();

flutter_inappwebview_android/lib/src/chrome_safari_browser/chrome_safari_browser.dart

@@ -173,6 +173,9 @@ class AndroidChromeSafariBrowser extends PlatformChromeSafariBrowser
  final bool didUserInteract = call.arguments["didUserInteract"];
  eventHandler?.onSessionEnded(didUserInteract);
  break;
+ case "onBrowserNotSupported":
+ eventHandler?.onBrowserNotSupported();
+ break;
  default:
  throw UnimplementedError("Unimplemented ${call.method} method");
  }

flutter_inappwebview_platform_interface/lib/src/chrome_safari_browser/platform_chrome_safari_browser.dart

@@ -590,6 +590,14 @@ abstract class PlatformChromeSafariBrowserEvents {
  ///{@endtemplate}
  void onGreatestScrollPercentageIncreased(int scrollPercentage) {}
 
+ ///{@template flutter_inappwebview_platform_interface.PlatformChromeSafariBrowser.onBrowserNotSupported}
+ /// Called when the browser is not supported.
+ /// This can happen if a user forces a certain browser package to be used but the browser is not installed on the user's system.
+ void onBrowserNotSupported() {
+ throw UnimplementedError(
+ 'onBrowserNotSupported is not implemented on the current platform');
+ }
+
  ///{@template flutter_inappwebview_platform_interface.PlatformChromeSafariBrowser.onSessionEnded}
  ///Called when a `CustomTabsSession` is ending or when no further Engagement Signals
  ///callbacks are expected to report whether any user action has occurred during the session.