来自Android广播接收器的通知不工作

我正在尝试在我的应用程序进行每日检查时通知用户。代码运行正常，但通知从未出现在状态栏中。有人知道为什么吗

public class OnNotificationReceiver extends BroadcastReceiver {

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

    WakeReminderIntentService.acquireStaticLock(context);
    Intent i = new Intent(context, NotificationService.class);
    context.startService(i);

    Bundle extra = intent.getExtras();
    int icon = extra.getInt("icon");
    notification(context, icon);

    Log.d("DailyCheck", "Checking for sales");
}
 private void notification(Context ctx, int icon) {
        String ns = Context.NOTIFICATION_SERVICE;
        NotificationManager mNotificationManager = (NotificationManager) ctx.getSystemService(ns);


        CharSequence tickerText = "ticker";
        long when = System.currentTimeMillis() + 1000;


        Notification notification = new Notification(icon, tickerText, when);


        CharSequence contentTitle = "Title Here";
        CharSequence contentText = "Text here";
        Intent notificationIntent = new Intent(ctx, MainActivity.class);
        PendingIntent contentIntent = PendingIntent.getActivity(ctx, 0, notificationIntent, 0);

        notification.setLatestEventInfo(ctx, contentTitle, contentText, contentIntent);
        notification.flags |= Notification.DEFAULT_SOUND;

        mNotificationManager.notify(9999, notification);
    }

}

编辑：我试着将它复制到我的主线程（通知方法）中，效果很好。所以一定是广播接收器的问题

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编辑2：传递给它的上下文是MainActivity。此（我的主要活动）

请尝试通知顶部的这一行，然后将此上下文用于方法的其余部分：

Context context = ctx.getApplicationContext();

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我不确定这能完成什么…但我无论如何都试过了，但没有成功。