這里給大家介紹兩種方法，直接上代碼：

第一種：

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;
}

權(quán)限配置

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

第二種

后臺分為：service后臺和activity后臺，這里認(rèn)為不是前臺的都認(rèn)為后臺。
?service運(yùn)行在后臺，appProcess.importance = IMPORTANCE_SERVICE，
?沒有service運(yùn)行的后臺

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;
 }

希望可以幫助大家
如果哪里有什么不對或者不足的地方，還望讀者多多提意見或建議
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