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

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

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

@@ -17,6 +17,7 @@ import android.os.Environment;
 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;
@@ -27,6 +28,7 @@ import android.webkit.CookieManager;
 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;
@@ -69,6 +71,7 @@ import com.reactnativecommunity.webview.events.TopLoadingProgressEvent;
 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;
@@ -575,6 +578,7 @@ public class RNCWebViewManager extends SimpleViewManager<WebView> {
     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;
   }
 
@@ -771,7 +775,7 @@ public class RNCWebViewManager extends SimpleViewManager<WebView> {
       mLastLoadFailed = false;
 
       RNCWebView reactWebView = (RNCWebView) webView;
-      reactWebView.callInjectedJavaScriptBeforeContentLoaded();       
+      reactWebView.callInjectedJavaScriptBeforeContentLoaded();
 
       dispatchEvent(
         webView,
@@ -828,11 +832,11 @@ public class RNCWebViewManager extends SimpleViewManager<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(
@@ -842,7 +846,7 @@ public class RNCWebViewManager extends SimpleViewManager<WebView> {
           failingUrl
         );
     }
-    
+
     @Override
     public void onReceivedError(
       WebView webView,
@@ -899,6 +903,41 @@ public class RNCWebViewManager extends SimpleViewManager<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

@@ -0,0 +1,26 @@
+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)
+
+}