Fix monkey NullPointerException

bug: 5385775
 Check mWebViewCore has been destroyed
 Remove mWebTextView from WebView when WebView is destroyed
 Clear WebTextView's handler when it is removed from WebView

Change-Id: I9c62292d693109e692c341e3e4dba3e04af81fe4

core/java/android/webkit/WebTextView.java

@@ -768,9 +768,13 @@ import junit.framework.Assert;
             imm.hideSoftInputFromWindow(getWindowToken(), 0);
         }
         mInsideRemove = true;
+        boolean isFocused = hasFocus();
         mWebView.removeView(this);
-        mWebView.requestFocus();
+        if (isFocused) {
+            mWebView.requestFocus();
+        }
         mInsideRemove = false;
+        mHandler.removeCallbacksAndMessages(null);
     }
 
     @Override

core/java/android/webkit/WebView.java

@@ -1581,6 +1581,11 @@ public class WebView extends AbsoluteLayout
             mListBoxDialog.dismiss();
             mListBoxDialog = null;
         }
+        // remove so that it doesn't cause events
+        if (mWebTextView != null) {
+            mWebTextView.remove();
+            mWebTextView = null;
+        }
         if (mNativeClass != 0) nativeStopGL();
         if (mWebViewCore != null) {
             // Set the handlers to null before destroying WebViewCore so no
@@ -7636,6 +7641,10 @@ public class WebView extends AbsoluteLayout
     }
 
     /* package */ void passToJavaScript(String currentText, KeyEvent event) {
+        // check if mWebViewCore has been destroyed
+        if (mWebViewCore == null) {
+            return;
+        }
         WebViewCore.JSKeyData arg = new WebViewCore.JSKeyData();
         arg.mEvent = event;
         arg.mCurrentText = currentText;