CalculateActivity.java 文件源码

private void overlay(Bitmap bm1, Bitmap bm2) {
    // Combine bitmaps
    bmOverlay = Bitmap.createBitmap(bm1.getWidth(), bm1.getHeight(), bm1.getConfig());
    Canvas canvas = new Canvas(bmOverlay);
    Paint paint = new Paint();
    paint.setAlpha(128);
    canvas.drawBitmap(bm1, new Matrix(), null);
    canvas.drawBitmap(bm2, 0, 0, paint);
}