android - Pinch-zoom on a ListView

Question

I have a ListView which contains a few TextView's arranged using a custom adapter.

What I would like to do, is implement pinch-to-zoom on this ListView, so that when the user pinches, they can increase or decrease the size of the text.

Does anyone know of examples of doing something similar to this? I tried following the code here: Pinch zoom for custom view, but I ended up with a ListView that would not respond to any touch events except the pinch gesture.

I'm hoping this is possible without writing a new class that extends ListView.

Answer 1

You should be able to follow the Pinch zoom for custom view and then do something like this when overriding the onTouchEvent. This will allow you to listen for a scale event, as well as all other touch events in the listview.

@Override
public boolean onTouchEvent(MotionEvent ev) {
    // Let the ScaleGestureDetector inspect all events.
    mScaleDetector.onTouchEvent(ev);
    return super.onTouchEvent(ev);
}