如何在Android中查找捏缩放方向？

Question

I have implemented pinch to zoom in my app.Normal zoom in and zoom out are working fine. But if i zoom out while zooming in(without taking hands off from canvas) it is returning scale factor greater than 1 only. So i am not able to do he calculation properly.Is there any way to find out the zoom direction other than checking scalefactor value greater than 1.0 or not?

Answer 1

This works for me

private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener
{
  @Override
  public boolean onScale(ScaleGestureDetector detector)
  {
    mScaleFactor *= detector.getScaleFactor();
          // Don't let the object get too small or too large.
    mScaleFactor = Math.max(MIN_SCALE, Math.min(mScaleFactor, MAX_SCALE));
    //Log.d(TAG, "factor = " + mScaleFactor);

    updateTextSize();
    return true;
   }
}

Answer 2

For determining in/out direction you can compare

detector.getCurrentSpan();
detector.getPreviousSpan();

For determining horizontal/vertical direction you can compare

detector.getCurrentSpanX();
detector.getCurrentSpanY();