Android ScaleGestureDetector work with GestureDetector.

gistfile1.java

    @Override
    public boolean onTouchEvent(MotionEvent event)
    {
        boolean result = mScaleGestureDetector.onTouchEvent(event);

        // result is always true here, so I need another way to check for a detected scaling gesture
        boolean isScaling = result = mScaleGestureDetector.isInProgress();
        if (!isScaling)
        {
            // if no scaling is performed check for other gestures (fling, long tab, etc.)
            result = mCommonGestureDetector.onTouchEvent(event);
        }

        // some irrelevant checks...

        return result ? result : super.onTouchEvent(event);
    }