Java tutorial
//package com.java2s; import android.app.Activity; import android.app.ActivityManager; import android.content.Context; import java.util.List; public class Main { public static boolean isTopActivy(Activity activity) { ActivityManager manager = (ActivityManager) activity.getSystemService(Context.ACTIVITY_SERVICE); List<ActivityManager.RunningTaskInfo> runningTaskInfos = manager.getRunningTasks(1); String cmpNameTemp = null; if (null != runningTaskInfos) { cmpNameTemp = (runningTaskInfos.get(0).topActivity).toString(); } return null != cmpNameTemp && cmpNameTemp.equals(activity.getComponentName().toString()); } }