java - Android 警报管理器和通知

Question

以下代码不起作用。也可以尝试这个而不是 getapplicationcontext。我需要提示:

public class AlarmReceiver extends BroadcastReceiver {
     @Override
     public void onReceive(Context context, Intent intent) {     
         NotificationCompat.Builder nb = new NotificationCompat.Builder();
         nb.setContentTitle("title");
         nb.setContentText("message");
         nb.setSmallIcon(R.drawable.ic_launcher);
         NotificationManager nm = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
         final Intent notificationIntent = new Intent(getApplicationContext(), MainActivity.class);
         notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
         final PendingIntent contentIntent = PendingIntent.getActivity(getApplicationContext(), 0, notificationIntent, 0);
         nb.setContentIntent(contentIntent);
         Notification notification = nb.getNotification();
         nm.notify(0, notification);
      }

    }

如何在 onclick 后删除通知？

更新: 我解决了一个错误。但还有一个错误:

Answer 1

将 getSystemService 替换为 context.getSystemService!