WebView 打开弹窗活动出错，魅族手机出错

Thread [JavaBridge] (Suspended (exception ViewRootImpl$CalledFromWrongThreadException))    

    ViewRootImpl.checkThread() line: 6531    

    ViewRootImpl.invalidateChildInParent(int[], Rect) line: 913    

    RelativeLayout(ViewGroup).invalidateChild(View, Rect) line: 4702    

    RelativeLayout(View).invalidateInternal(int, int, int, int, boolean, boolean) line: 11836    

    RelativeLayout(View).invalidate(boolean) line: 11800    

    Button(View).setFlags(int, int) line: 9805    

    Button(View).setVisibility(int) line: 6707    

    CommonWebViewScriptBarActivity.closeModel() line: 631    

    WebViewScript.CloseModelPopView() line: 122    

    SystemMessageHandler.nativeDoRunLoopOnce(long, long) line: not available [native method]    

    SystemMessageHandler.handleMessage(Message) line: 53    

    SystemMessageHandler(Handler).dispatchMessage(Message) line: 102    

    Looper.loop() line: 135    
    HandlerThread.run() line: 61   

  解决方案如下:

主线程建Handler

 private class  MainHandler  extends Handler{

        /**

         * Subclasses must implement this to receive messages.

         */

        public void handleMessage(Message msg) {

            switch(msg.what){

            case 1:

             btnRight.setVisibility(View.INVISIBLE);

             btnRight.setText("");

           break;

           

            default:

                break;

            

            }

        }

        
    }

Message msg = new Message();

        msg.what = 0;

        mainHandler.sendMessage(msg);

这样就ok了