How to use

getLocalMatrix

method

in

android.graphics.BitmapShader

@Override
protected void onBoundsChange(Rect bounds) {
  super.onBoundsChange(bounds);
  Matrix m = new Matrix();
  mBitmapShader.getLocalMatrix(m);
  // Scale bitmap to display within specified bounds
  int minScale = Math.min(bounds.width(), bounds.height());
  m.setScale(minScale / mBitmapRect.width(), minScale / mBitmapRect.height());
  // When bounds is not a square, ensure we display the bitmap centered
  // (we will clip to display as a centered circle,
  //  and we need to ensure the bitmap is in the right position below)
  if (bounds.width() > bounds.height()) {
    m.postTranslate((bounds.width() - bounds.height()) * 0.5f, 0f);
  }
  mBitmapShader.setLocalMatrix(m);
  mDisplayBounds.set(bounds);
}