我的工作中的应用，需要进行同步的每一个夜晚。我用的告警管理，调用一个BroadcastReceiver在我想要的小时。的问题是，如果应用程序在前台运行，以避免丢失数据我不能让一个同步。所以，我需要知道的广播接收器，如果应用程序在前台运行，取消此同步。

I am working in application that needs make a synchronization every night. I use Alarm Manager that calls a BroadcastReceiver at the hour that I want. The problem is that I cant make a synchronization if the application is running in foreground to avoid losing data. So I need to know in Broadcast Receiver if the app is running in foreground to cancel this synchronization.

我想，我找到了StackOverflow的解决方案： Android:在后台运行的应用程序？ 但是，这个参数始终是虚假的BroadcastReceiver，但真正在activites。

I tried solutions that I found in StackOverflow: Android: Is application running in background? But this parameter is always false in BroadcastReceiver, but true in activites.

谁能告诉我这是什么问题？我在做什么不好？

Can anyone tell me which is the problem? What am I doing bad?

真是感谢！

推荐答案

试试这个办法，希望这对你的作品

Try this way hope this works for you

public class MyBroadcastReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {

        if (isAppForground(context)) {
            // App is in Foreground
        } else {
            // App is in Background
        }
    }

    public boolean isAppForground(Context mContext) {

        ActivityManager am = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);
        List<RunningTaskInfo> tasks = am.getRunningTasks(1);
        if (!tasks.isEmpty()) {
            ComponentName topActivity = tasks.get(0).topActivity;
            if (!topActivity.getPackageName().equals(mContext.getPackageName())) {
                return false;
            }
        }

        return true;
    }

}

添加此权限

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