Java tutorial
//package com.java2s; //License from project: LGPL import java.lang.reflect.Field; public class Main { public static int OP_SYSTEM_ALERT_WINDOW = 0; public static void init() { try { Class AppOpsManager = Class.forName("android.app.AppOpsManager"); Field field = AppOpsManager.getDeclaredField("OP_SYSTEM_ALERT_WINDOW"); field.setAccessible(true); OP_SYSTEM_ALERT_WINDOW = field.getInt(null); } catch (ClassNotFoundException e2) { } catch (NoSuchFieldException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } } }