ScaleGestureDetector

I referred this site.

I create custom view.

public class ScaleGestureDetectorView extends View {

I prepare image for Drawable. I prepare s093 named jpeg image.

int resid = context.getResources().getIdentifier("s093", "drawable", context.getPackageName());
Drawable mImage;
mImage = context.getResources().getDrawable(resid);
mImage.setBounds(0, 0, width, height );

I prepare ScaleGestureDetector class.

mScaleGestureDetector = new ScaleGestureDetector(context, mSimpleListener);

call onDraw() by invalidate().

public void onDraw(Canvas canvas) {
 super.onDraw(canvas);
  
 canvas.save();
 canvas.scale(mScaleFactor, mScaleFactor);
 mImage.draw(canvas);
  
 canvas.restore();

input event to ScaleGestureDetector at onTouchEvent.

public boolean onTouchEvent(MotionEvent ev) {
    mScaleGestureDetector.onTouchEvent(ev);
    return true;
}

I prepare ScaleGestureDetector.SimpleOnScaleGestureListener

public void onScaleEnd(ScaleGestureDetector detector) {
 Log.d("ges", "onScaleEnd "+ detector.getScaleFactor());
 mScaleFactor *= detector.getScaleFactor();
 invalidate();
 super.onScaleEnd(detector);
}

source code is here. Please suggest your android issue by twitter or mail, I would try to clear up your issue.