Making sense of multitouch on Android. The purpose is being able to track drag event for multiple pointers. There is a major confusion between pointer ID, action index and how they should be used.

AndroidMultiTouch.java

public boolean onTouchEvent(MotionEvent m) {
        int pointerCount = m.getPointerCount();
        
        int action = m.getActionMasked();
        
        String actionString;

        if ( action == MotionEvent.ACTION_MOVE ){
            // we don't know which one moved, so process them all
            for ( int i = 0; i < pointerCount; i++ ){
                int pointerId = m.getPointerId(i);
                int x = (int)m.getX(i);
                int y = (int)m.getY(i);
                engine.dragMove(pointerId, x, y);
            }
        }
        else{
            int actionIndex = m.getActionIndex();
            int pointerId = m.getPointerId(actionIndex);

            switch (action)
            {
                    case MotionEvent.ACTION_POINTER_DOWN:
                    case MotionEvent.ACTION_DOWN:
                            int x = (int) m.getX(actionIndex);
                            int y = (int) m.getY(actionIndex);
                            engine.dragStart(pointerId, x, y);
                            break;
                    case MotionEvent.ACTION_POINTER_UP:
                    case MotionEvent.ACTION_UP:
                    case MotionEvent.ACTION_CANCEL:
                            engine.dragStop(pointerId);
                            break;
            }
        }
        
        return true;
    }

Did you ever work it out? I'm struggling with this at the moment. Your post was 5 years ago so I'm not hopeful.
My problem is the pointer Id's used in MOVE events, don't correlate to the pointer Id's of normal events.

i.e.
1st finger DOWN = pointer 0
2nd finger DOWN = pointer 1
2nd finger MOVE = pointer 1
1st finger UP = pointer 0
2nd finger MOVE = pointer 0 <------ Once a finger is lifted, all the pointers shift, however move's still report as the original pointer Id.
Even worse, if you return the 1st finger, the pointers shift back up