Floating Touch on Galaxy S4

问题:

Samsung Galaxy S4 have the "Floating Touch" functionality, in which the finger can be detected even if the screen is not touched.

I would like to fire an event on a button (btn1) when the finger is passing hover it.

I tried using the OnHoverListener, but "onHover" never get called when the MotionEvent is MotionEvent.ACTION_HOVER_ENTER or MotionEvent.ACTION_HOVER_EXIT or MotionEvent.ACTION_HOVER_MOVE, which are the event that I need.

This is my code:

btn1.setOnHoverListener(new OnHoverListener() {
@Override
public boolean onHover(View v, MotionEvent event) {
    Log.d("FloatingTouch", "onHover: "+event.getAction());
    switch (event.getAction()) {
      case MotionEvent.ACTION_HOVER_ENTER:
          Log.d("FloatingTouch", "ACTION_HOVER_ENTER" );
          return true;
      case MotionEvent.ACTION_HOVER_MOVE:
          Log.d("FloatingTouch", "ACTION_HOVER_MOVE" );
          return true;
      case MotionEvent.ACTION_HOVER_EXIT:
          Log.d("FloatingTouch", "ACTION_HOVER_EXIT" );
          break;
      default:
          break;
    }
    return false;
}
});

Do I miss something? Maybe some permission?

回答1:

OK, I finally got it!

To make it work you have to:

1. Add a new intent filter to com.sec.android.airview.HOVER for your Activity in the manifest:

2. Add an onHoverListener to you View

   convertView.setOnHoverListener(new OnHoverListener() { @Override public boolean onHover(View v, MotionEvent event) { Log.d("ListAdapter", "Hover: " + item); return false; } });

It will works.