/**      *判断当前应用程序处于前台还是后台      */     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;     }

<uses-permission android:name="android.permission.GET_TASKS" /> 

public static boolean isBackground(Context context) {     ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);     List<RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();     for (RunningAppProcessInfo appProcess : appProcesses) {          if (appProcess.processName.equals(context.getPackageName())) {                 if (appProcess.importance == RunningAppProcessInfo.IMPORTANCE_BACKGROUND) {                           Log.i("后台", appProcess.processName);                           return true;                 }else{                           Log.i("前台", appProcess.processName);                           return false;                 }            }     }     return false; }