我正在尝试创建一个简单的应用程序，以每天在特定时间发出通知，但是不知何故，它在所有代码中均不返回错误：

按下通知后开始通知的按钮：

setRenider.setOnClicklistener(new View.OnClicklistener() {
        @Override
        public void onClick(View v) {

            Calendar calendar = Calendar.getInstance();
            calendar.set(Calendar.HOUR_OF_DAY,18);
            calendar.set(Calendar.MINUTE,14);
            calendar.set(Calendar.SECOND,0);

            Intent intent = new Intent(getapplicationContext(),Notification_reciever.class);

            PendingIntent pendingIntent = PendingIntent.getBroadcast(getapplicationContext(),100,intent,PendingIntent.flaG_UPDATE_CURRENT);

            AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
            alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,calendar.getTimeInmillis(),AlarmManager.INTERVAL_DAY,pendingIntent);

        }
    });

然后这是通知类：

public class Notification_reciever extends BroadcastReceiver {
@Override
public void onReceive(Context context,Intent intent) {

    Notificationmanager notificationmanager = (Notificationmanager) context.getSystemService(context.NOTIFICATION_SERVICE);
    Intent repeating_intent = new Intent(context,Reaptingactivity.class);
    repeating_intent.setflags(Intent.flaG_actIVITY_CLEAR_TOP);
    PendingIntent pendingIntent = PendingIntent.getactivity(context,repeating_intent,PendingIntent.flaG_UPDATE_CURRENT);
    NotificationCompat.Builder builder = new NotificationCompat.Builder(context).setContentIntent(pendingIntent).setSmallIcon(R.drawable.ic_free_breakfast_black_24dp)
            .setContentTitle("Water Time").setContentText("Drink Water").setautoCancel(true);

    notificationmanager.notify(100,builder.build());


  }
}

，然后创建一个简单的空活动，命名为Reaptingactivity 然后在清单中输入这些代码：

<uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>

<application
    <receiver android:name=".Notification_reciever"/>
</application>

基于我遵循的教程，它应该可以运行，但是还没有。请注意，我输入的时间是正确的，但没有任何通知！！！