Change Opacity programmatically

• ImageView change opacity programmatically

                ImageView Img = (ImageView) findViewById(R.id.Img);

                Img.setAlpha(45);

• Change Background opacity programmatically

                LinearLayout LLayout = (LinearLayout) findViewById(R.id.LLayout);

                   

                LLayout.setBackgroundResource(Color.RED);

                LLayout.getBackground().setAlpha(30);