OnTouchEvent not called on webview

Question

I would like to use onTouchEvent in WebView. However, nothing is displayed in log. It works if I change onTouchEvent to dispatchTouchEvent.

Why is onTouchEvent not called?

public WebView myWebView;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    myWebView = (WebView)findViewById(R.id.webView01);
    myWebView.setWebViewClient(new WebViewClient());
    myWebView.loadUrl("http://www.google.co.jp");
    //javascript
    myWebView.getSettings().setJavaScriptEnabled(true);
}

@Override
public boolean onTouchEvent(MotionEvent ev) {
    Log.d("TouchEvent","call");
    return true;
}

score 1 · Accepted Answer · answered Oct 25 '17 at 13:01

you are talking 'OnTouchEvent' of activity, not Webview.

So,Why OnTouchEvent not called? It is about Event delivery in activity. In short, the webview consume the event when you touch the window.

You can do a test:
1. put a Button and a Textview in activity. log in onTouchEvent().
2. touch the Button --> onTouchEvent() not be called. because Button consume the event, like your webview.
3. touch the Textview --> onTouchEvent() will be called. because Textview can not consume the event.

About 'Event delivery', you can get much with google. maybe this will help you to understand it.

score 0 · Answer 2 · answered Oct 25 '17 at 12:41

0

Use dispatchTouchEvent instead of touchEvent

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {

    //your code
    return super.dispatchTouchEvent(ev);
}

answered Oct 25 '17 at 12:41

Ghulam Moinul Quadir

1,638
1
12
17

score 0 · Answer 3 · edited Oct 25 '17 at 12:47

0

you haven't set myWebView.setOnTouchListener(this) for your webView.

edited Oct 25 '17 at 12:47

Sneh Pandya

8,197
7
35
50

answered Oct 25 '17 at 12:43

mithil1501

506
9
20

score 0 · Answer 4 · answered Oct 25 '17 at 13:18

Add this:

myWebView.setOnTouchListener(new OnTouchListener(){
   public boolean onTouch(View arg0, MotionEvent event){
        int x = (int) event.getX();
        int y = (int) event.getY();
        return true;
   } 
)

Remove this:

@Override
public boolean onTouchEvent(MotionEvent ev) {
    Log.d("TouchEvent","call");
    return true;
}

OnTouchEvent not called on webview

4 Answers4