【Android】判断应用Application、Activity、Service是否处于活动状态

本文主要是介绍【Android】判断应用Application、Activity、Service是否处于活动状态，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

通过ActivityManager我们可以获得系统里正在运行的activities，包括进程(Process)等、应用程序/包、服务(Service)、任务(Task)信息。

1、判断应用App是否活动

/*** 判断应用是否已经启动* @param context 一个context* @param packageName 要判断应用的包名* @return boolean*/
private boolean isAppAlive(Context context, String packageName){ActivityManager activityManager =(ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);List<ActivityManager.RunningAppProcessInfo> processInfos= activityManager.getRunningAppProcesses();for(int i = 0; i < processInfos.size(); i++){if(processInfos.get(i).processName.equals(packageName)){Log.i("NotificationLaunch",String.format("the %s is running, isAppAlive return true", packageName));return true;}}Log.i("NotificationLaunch",String.format("the %s is not running, isAppAlive return false", packageName));return false;
}

2、判断Activity是否活动

/*** 判断MainActivity是否活动* @param context 一个context* @param activityName 要判断Activity* @return boolean
*/
private boolean isMainActivityAlive(Context context, String activityName){ActivityManager am = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);List<ActivityManager.RunningTaskInfo> list = am.getRunningTasks(100);for (ActivityManager.RunningTaskInfo info : list) {// 注意这里的 topActivity 包含 packageName和className，可以打印出来看看if (info.topActivity.toString().equals(activityName) || info.baseActivity.toString().equals(activityName)) {Log.i(TAG,info.topActivity.getPackageName() + " info.baseActivity.getPackageName()="+info.baseActivity.getPackageName());return true;}}return false;
}

3、Activity是否显示在前台

/*** 检测某Activity是否在当前Task的栈顶*/
private boolean isTopActivity(String activityName){ActivityManager manager = (ActivityManager) mContext.getSystemService(ACTIVITY_SERVICE);List<ActivityManager.RunningTaskInfo> runningTaskInfos = manager.getRunningTasks(1);String cmpNameTemp = null;if(runningTaskInfos != null){cmpNameTemp = runningTaskInfos.get(0).topActivity.toString();}if(cmpNameTemp == null){return false;}return cmpNameTemp.equals(activityName);
}

4、Service是否在运行

/**  * 用来判断服务是否运行.  * @param context  * @param className 判断的服务名字  * @return true 在运行 false 不在运行  */  
public static boolean isServiceRunning(Context mContext,String className) {   boolean isRunning = false;   ActivityManager activityManager = (ActivityManager)   mContext.getSystemService(Context.ACTIVITY_SERVICE);    //此处只在前30个中查找，大家根据需要调整                             List<ActivityManager.RunningServiceInfo> serviceList = activityManager.getRunningServices(30);   if (!(serviceList.size()>0)) {   return false;   }   for (int i=0; i<serviceList.size(); i++) {   if (serviceList.get(i).service.getClassName().equals(className) == true) {   isRunning = true;   break;   }   }   return isRunning;   
}