提醒通知不显示

Question

我正在制作一个应用程序来提醒用户一些事情。我想在将来的某个时间显示通知。我已经按照一些教程编写了下面的代码，但它似乎不起作用。在我期待通知的时候，它没有出现。

我正在使用 BroadcastReceiver 和 AlarmManager 在需要的时间发出通知。这是我的（简化的）代码。

设置时间的代码：

try {
        Date date = format.parse(timeInput);//This part works
        long time = date.getTime();//Get the time in milliseconds

        Intent i = new Intent(getBaseContext(), AlarmReceiver.class);

        PendingIntent alarmSender = PendingIntent.getBroadcast(getBaseContext(), 0, i, 0);

        AlarmManager am = (AlarmManager) getBaseContext().getSystemService(Context.ALARM_SERVICE);
        am.set(AlarmManager.RTC_WAKEUP, time, alarmSender);

        Toast.makeText(getBaseContext(), "Keep the app running to receive a reminder notification", Toast.LENGTH_LONG).show();

        super.onBackPressed();

    }catch(Exception e){
        Toast.makeText(getBaseContext(), "Parsing error. Format:\ndd/MM/yyyy and HH:mm", Toast.LENGTH_SHORT).show();
    }

AlarmReceiver.onReceive()方法：

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

    Intent i = new Intent(context, MenuActivity.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
    PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, i, 0);


    NotificationCompat.Builder nBulder = new NotificationCompat.Builder(context)
            .setSmallIcon(R.drawable.notify_icon)
            .setContentTitle("title")
            .setContentText("text")
            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
            .setContentIntent(pendingIntent)
            .setAutoCancel(true);
    NotificationManagerCompat nManager = NotificationManagerCompat.from(context);
    nManager.notify(0, nBulder.build());

}

一切都在清单文件中正确声明。

Answer 1

我找到了另一种方法。我没有使用 BroadcastListener 和 AlarmManager，而是使用了新的 Thread。它一直等到 System.currentTimeMillis() == time 并使用 runOnUIThread() 在 UI 线程上运行可运行对象。在该运行中，发出通知。

我不知道这是否是一个 good/efficient 解决方案，但它做得很好。

Answer 2

   <receiver
        android:name=".AlarmReceiver"
        android:enabled="true"
        android:exported="true"></receiver>

    public class AlarmReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            // TODO: This method is called when the BroadcastReceiver is receiving
            // an Intent broadcast.
           throw new UnsupportedOperationException("Not yet implemented");
       }
   }

小改动：

    try {
        long time = System.currentTimeMillis();
        Intent i = new Intent(getApplicationContext(), AlarmReceiver.class);
        PendingIntent alarmSender = PendingIntent.getBroadcast(getApplicationContext(), 0, i, 0);
        AlarmManager am = (AlarmManager) getApplication().getSystemService(Context.ALARM_SERVICE);
        am.set(AlarmManager.RTC_WAKEUP, time, alarmSender);
    } catch(Exception e){
        Toast.makeText(getBaseContext(), "Parsing error. Format:\ndd/MM/yyyy and HH:mm", Toast.LENGTH_SHORT).show();
    }

Difference between getContext() , getApplicationContext() , getBaseContext() and "this"

提醒通知不显示

Reminder notification doesn't show up

java

android

broadcastreceiver

alarmmanager