How to make bitmap transparent?

Question

/**
 * @param bitmap
 *            The source bitmap.
 * @param opacity
 *            a value between 0 (completely transparent) and 255 (completely
 *            op         


        

Answer 1

Add method

Bitmap bmp; DrawView DrawView;

private static Bitmap makeTransparentBitmap(Bitmap bmp, int alpha) {
        Bitmap transBmp = Bitmap.createBitmap(bmp.getWidth(),
                bmp.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(transBmp);
        final Paint paint = new Paint();
        paint.setAlpha(alpha);
        canvas.drawBitmap(bmp, 0, 0, paint);
        return transBmp;
    }


@Override
protected void onDraw(Canvas canvas) {
    canvas.drawColor(Color.rgb(43,44,45));

    bmp = BitmapFactory.decodeResource(getResources(), R.drawable.mouse);
    canvas.drawBitmap(bmp, pos_x, pos_y, null); 

}

You event:

bmp = makeTransparentBitmap( bmp, 122 );
DrawView.invalidate();

DrawView is

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    DrawView = new DrawView(this);
    setContentView( DrawView );
}

I found this answer here