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Android - Intercept and pass on all touch events

Asked 2011-07-27T09:17:18.733
17

I have an overlay ViewGroup that is the size of the screen which I want to use to show an effect when the user interacts with the app, but still passes the onTouch event to any underlying views.

I am intrested in all MotionEvents (not just DOWN), so onInterceptTouchEvent() does not apply here as if i return true my overlay will consume all events, and if false will only receive the DOWN events (the same applys to onTouch).

I thought I could override the Activitys dispatchTouchEvent(MotionEvent ev) and call a custom touch event in my overlay, but this has the effect of not translating the input coords depending on the position of my view (for example all events will pass appear to be happening 20 or so px below the actual touch as the system bar is not taken into account).

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Here's what I did, building on Dori's answer I used onInterceptTouch . . . 

float xPre = 0;

@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
    if(Math.abs(xPre - event.getX()) < 40){
        return false;
    }
    if(event.getAction() == MotionEvent.ACTION_DOWN || event.getAction() == MotionEvent.ACTION_UP  || event.getAction() == MotionEvent.ACTION_MOVE){
        xPre = event.getX();
    }
    return true;
}

Basically, when any important movement is made, remember where it happened, via xPre; then if that point is close enough to the next point to be say, an onClick/onTouch of the child view return false and let onTouch do it's default thing.

answered 2012-09-05T16:53:59.040

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