I am using a linear layout and frame layout. In the linear layout I keep an image as background and in the frame layout I keep an imageView. In that imageView I give an image.>
Image alpha sets just opacity to ImageView which makes Image blurry, try adding tint attribute in ImageView
android:tint="#66000000"
It can also be done programatically :
imageView.setColorFilter(R.color.transparent);
where you need to define transparent color in your colors.xml
#66000000