/**
  *判斷當前應用程序處于前臺還是后臺
  * 
  * @param context
  * @return 

  */

 public static boolean isApplicationBroughtToBackground(final Context context) {
  ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
  List<RunningTaskInfo> tasks = am.getRunningTasks(1);
  if (!tasks.isEmpty()) {
   ComponentName topActivity = tasks.get(0).topActivity;
   if (!topActivity.getPackageName().equals(context.getPackageName())) {
    return true;
   }
  }
  return false;
 }

public static boolean isBackground(Context context) {


  ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
  List<ActivityManager.RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();
  for (ActivityManager.RunningAppProcessInfo appProcess : appProcesses) {
   if (appProcess.processName.equals(context.getPackageName())) {
    if (appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
     System.out.print(String.format("Foreground App:", appProcess.processName));
     return false;
    }else{
     System.out.print("Background App:"+appProcess.processName);
     return true;
    }
   }
  }
  return false;
 }