Java tutorial
//package com.java2s; //License from project: Apache License import android.graphics.drawable.Drawable; import android.os.Build; import android.view.View; public class Main { public static void setAlpha(View view, int alpha) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { view.setAlpha(alpha / 255.0f); } else { Drawable drawable = view.getBackground(); if (drawable != null) { drawable.setAlpha(alpha); } } } }