Java tutorial
//package com.java2s; import android.app.ActivityManager; import android.content.Context; import java.util.List; public class Main { public static boolean isSingleActivity(Context ctx) { ActivityManager activityManager = (ActivityManager) ctx.getSystemService(Context.ACTIVITY_SERVICE); List<ActivityManager.RunningTaskInfo> tasks = activityManager.getRunningTasks(1); return tasks.get(0).numRunning == 1; } }