feat(android): WebView crash handling (#1480)

Co-authored-by: Cristiano Coelho <cristianocca@hotmail.com>

android/src/main/java/com/reactnativecommunity/webview/RNCWebViewManager.java

 import androidx.annotation.RequiresApi;
 import androidx.core.content.ContextCompat;
 import android.text.TextUtils;
+import android.util.Log;
 import android.view.Gravity;
 import android.view.View;
 import android.view.ViewGroup;
 import android.webkit.DownloadListener;
 import android.webkit.GeolocationPermissions;
 import android.webkit.JavascriptInterface;
+import android.webkit.RenderProcessGoneDetail;
 import android.webkit.SslErrorHandler;
 import android.webkit.PermissionRequest;
 import android.webkit.URLUtil;
 import com.reactnativecommunity.webview.events.TopLoadingStartEvent;
 import com.reactnativecommunity.webview.events.TopMessageEvent;
 import com.reactnativecommunity.webview.events.TopShouldStartLoadWithRequestEvent;
+import com.reactnativecommunity.webview.events.TopRenderProcessGoneEvent;
 
 import org.json.JSONException;
 import org.json.JSONObject;
     export.put(TopShouldStartLoadWithRequestEvent.EVENT_NAME, MapBuilder.of("registrationName", "onShouldStartLoadWithRequest"));
     export.put(ScrollEventType.getJSEventName(ScrollEventType.SCROLL), MapBuilder.of("registrationName", "onScroll"));
     export.put(TopHttpErrorEvent.EVENT_NAME, MapBuilder.of("registrationName", "onHttpError"));
+    export.put(TopRenderProcessGoneEvent.EVENT_NAME, MapBuilder.of("registrationName", "onRenderProcessGone"));
     return export;
   }
 
       mLastLoadFailed = false;
 
       RNCWebView reactWebView = (RNCWebView) webView;
-      reactWebView.callInjectedJavaScriptBeforeContentLoaded();       
+      reactWebView.callInjectedJavaScriptBeforeContentLoaded();
 
       dispatchEvent(
         webView,
           case SslError.SSL_UNTRUSTED:
             description = "The certificate authority is not trusted";
             break;
-          default: 
+          default:
             description = "Unknown SSL Error";
             break;
         }
-        
+
         description = descriptionPrefix + description;
 
         this.onReceivedError(
           failingUrl
         );
     }
-    
+
     @Override
     public void onReceivedError(
       WebView webView,
       }
     }
 
+    @TargetApi(Build.VERSION_CODES.O)
+    @Override
+    public boolean onRenderProcessGone(WebView webView, RenderProcessGoneDetail detail) {
+        // WebViewClient.onRenderProcessGone was added in O.
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
+            return false;
+        }
+        super.onRenderProcessGone(webView, detail);
+
+        if(detail.didCrash()){
+          Log.e("RNCWebViewManager", "The WebView rendering process crashed.");
+        }
+        else{
+          Log.w("RNCWebViewManager", "The WebView rendering process was killed by the system.");
+        }
+
+        // if webView is null, we cannot return any event
+        // since the view is already dead/disposed
+        // still prevent the app crash by returning true.
+        if(webView == null){
+          return true;
+        }
+
+        WritableMap event = createWebViewEvent(webView, webView.getUrl());
+        event.putBoolean("didCrash", detail.didCrash());
+
+        dispatchEvent(
+          webView,
+          new TopRenderProcessGoneEvent(webView.getId(), event)
+        );
+
+        // returning false would crash the app.
+        return true;
+    }
+
     protected void emitFinishEvent(WebView webView, String url) {
       dispatchEvent(
         webView,

android/src/main/java/com/reactnativecommunity/webview/events/TopRenderProcessGoneEvent.kt

+package com.reactnativecommunity.webview.events
+
+import com.facebook.react.bridge.WritableMap
+import com.facebook.react.uimanager.events.Event
+import com.facebook.react.uimanager.events.RCTEventEmitter
+
+/**
+ * Event emitted when the WebView's process has crashed or
+   was killed by the OS.
+ */
+class TopRenderProcessGoneEvent(viewId: Int, private val mEventData: WritableMap) :
+  Event<TopRenderProcessGoneEvent>(viewId) {
+  companion object {
+    const val EVENT_NAME = "topRenderProcessGone"
+  }
+
+  override fun getEventName(): String = EVENT_NAME
+
+  override fun canCoalesce(): Boolean = false
+
+  override fun getCoalescingKey(): Short = 0
+
+  override fun dispatch(rctEventEmitter: RCTEventEmitter) =
+    rctEventEmitter.receiveEvent(viewTag, eventName, mEventData)
+
+}

docs/Reference.md

 - [`mediaPlaybackRequiresUserAction`](Reference.md#mediaplaybackrequiresuseraction)
 - [`nativeConfig`](Reference.md#nativeconfig)
 - [`onError`](Reference.md#onerror)
+- [`onRenderProcessGone`](Reference.md#onRenderProcessGone)
 - [`onLoad`](Reference.md#onload)
 - [`onLoadEnd`](Reference.md#onloadend)
 - [`onLoadStart`](Reference.md#onloadstart)
 
 ---
 
+### `onRenderProcessGone`[⬆](#props-index)<!-- Link generated with jump2header -->
+
+Function that is invoked when the `WebView` process crashes or is killed by the OS on Android.
+
+> **_Note_**
+> Android API minimum level 26. Android Only
+
+| Type     | Required |
+| -------- | -------- |
+| function | No       |
+
+Example:
+
+```jsx
+<WebView
+  source={{ uri: 'https://reactnative.dev' }}
+  onRenderProcessGone={syntheticEvent => {
+    const { nativeEvent } = syntheticEvent;
+    console.warn(
+      'WebView Crashed: ',
+      nativeEvent.didCrash,
+    );
+  }}
+/>
+```
+
+Function passed to `onRenderProcessGone` is called with a SyntheticEvent wrapping a nativeEvent with these properties:
+
+```
+didCrash
+```
+---
+
 ### `onMessage`[⬆](#props-index)<!-- Link generated with jump2header -->
 
 Function that is invoked when the webview calls `window.ReactNativeWebView.postMessage`. Setting this property will inject this global into your webview.

src/WebView.android.tsx

   defaultRenderLoading,
 } from './WebViewShared';
 import {
+  WebViewRenderProcessGoneEvent,
   WebViewErrorEvent,
   WebViewHttpErrorEvent,
   WebViewMessageEvent,
     }
   }
 
+  onRenderProcessGone = (event: WebViewRenderProcessGoneEvent) => {
+    const { onRenderProcessGone } = this.props;
+    if (onRenderProcessGone) {
+      onRenderProcessGone(event);
+    }
+  }
+
   onLoadingFinish = (event: WebViewNavigationEvent) => {
     const { onLoad, onLoadEnd } = this.props;
     const { nativeEvent: { url } } = event;
         onLoadingProgress={this.onLoadingProgress}
         onLoadingStart={this.onLoadingStart}
         onHttpError={this.onHttpError}
+        onRenderProcessGone={this.onRenderProcessGone}
         onMessage={this.onMessage}
         onShouldStartLoadWithRequest={onShouldStartLoadWithRequest}
         ref={this.webViewRef}

src/WebViewTypes.ts

   statusCode: number;
 }
 
+export interface WebViewRenderProcessGoneDetail {
+  didCrash: boolean;
+}
+
 export type WebViewEvent = NativeSyntheticEvent<WebViewNativeEvent>;
 
 export type WebViewProgressEvent = NativeSyntheticEvent<
 
 export type WebViewHttpErrorEvent = NativeSyntheticEvent<WebViewHttpError>;
 
+export type WebViewRenderProcessGoneEvent = NativeSyntheticEvent<WebViewRenderProcessGoneDetail>;
+
 export type DataDetectorTypes =
   | 'phoneNumber'
   | 'link'
   javaScriptEnabled?: boolean;
   mixedContentMode?: 'never' | 'always' | 'compatibility';
   onContentSizeChange?: (event: WebViewEvent) => void;
+  onRenderProcessGone?: (event: WebViewRenderProcessGoneEvent) => void;
   overScrollMode?: OverScrollModeType;
   saveFormDataDisabled?: boolean;
   textZoom?: number;
   onNavigationStateChange?: (event: WebViewNavigation) => void;
   onContentSizeChange?: (event: WebViewEvent) => void;
 
+  /**
+   * Function that is invoked when the `WebView` process crashes or is killed by the OS.
+   * Works only on Android (minimum API level 26).
+   */
+  onRenderProcessGone?: (event: WebViewRenderProcessGoneEvent) => void;
+
   /**
    * https://developer.android.com/reference/android/webkit/WebSettings.html#setCacheMode(int)
    * Set the cacheMode. Possible values are:
    */
   geolocationEnabled?: boolean;
 
-  
+
   /**
    * Boolean that sets whether JavaScript running in the context of a file
    * scheme URL should be allowed to access content from other file scheme URLs.