Incorrect pointer count onInterceptTouchEvent

Question

I want my ViewPager to only slide when using a single finger. So I extended the class and implemented onInterceptTouchEvent like so: ``` @Override public boolean onInterceptTouchEvent(MotionEvent ev) { if(ev.getPointerCount() > 1) { return false; } return true; } ``` But getPointerCount() is always returning '1', no matter how many points are on the screen. I get the correct number when I override onTouchEvent, but when I do that a bug is preventing the pager from working at all ( http://code.google.com/p/android/issues/detail?id=18990 ) by throwning an app-killing exception when you raised your first finger out of multitouch: java.lang.IllegalArgumentException: pointerIndex out of range How else can I go about this? EDIT: The pointer count issue remains, but I was able to work around the exception that gets thrown in onTouchEvent. I was doing this when I got the exception: ``` if(ev.getPointerCount() == 1) { return super.onTouchEvent(ev); } return false; ``` The problem is that that…

Accepted Answer

Your onTouchEvent did not work for me. I will investigate why. But meanwhile I did another workaround. I dug into ViewPager code and found that you can do that instead:

```
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {

if (ev.getPointerCount() > 1){
        ev.setAction(MotionEvent.ACTION_CANCEL);
    }

return super.onInterceptTouchEvent(ev);

}
```

getPointerCount() works ok for me though. With the above code ViewPager processes also the ACTION_DOWN step and the bug in it never occure.

Incorrect pointer count onInterceptTouchEvent

Solution

Problem