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

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;   
}

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参考资料

1、Android中ActivityManager的使用案例
2、Android实现点击通知栏后，先启动应用再打开目标Activity的一个小demo
3、Android ActivityManager 检测Service与Activity是否正在运行