java如何在安卓上显示通知？

Question

我有以下功能：

public void startApp(View v){
        final NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(MainActivity.this);
        mBuilder.setSmallIcon(R.drawable.a);
        mBuilder.setContentTitle("arroz");
        mBuilder.setContentText("LOL ARROZ MASSA");
        mBuilder.setPriority(NotificationCompat.PRIORITY_DEFAULT);

        NotificationManager mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        mNotificationManager.notify(1, mBuilder.build());
    }

当我点击一个按钮时，我调用这个函数

我希望在执行此操作时显示通知，因此我使用了此代码，但通知没有显示。我错过了什么

编辑：

public void startApp(View v){
        final NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(MainActivity.this);
        mBuilder.setSmallIcon(R.drawable.a);
        mBuilder.setContentTitle("arroz");
        mBuilder.setContentText("LOL ARROZ MASSA");
        mBuilder.setPriority(NotificationCompat.PRIORITY_DEFAULT);
        mBuilder.setChannelId("1");
        NotificationManager mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        mNotificationManager.notify(1, mBuilder.build());
    }

Answer 1

您没有设置通知通道，这可能是原因。尝试设置channelId并检查

 final NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(MainActivity.this, "YOUR_CHANNEL_ID")
 mBuilder.setSmallIcon(R.drawable.a);
 mBuilder.setContentTitle("arroz");
 mBuilder.setContentText("LOL ARROZ MASSA");
 mBuilder.setPriority(NotificationCompat.PRIORITY_DEFAULT);

通知

NotificationManager mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);    
NotificationChannel notificationChannel = new NotificationChannel("YOUR_CHANNEL_ID", "CHANNEL_NAME", NotificationManager.IMPORTANCE_HIGH)
mNotificationManager.createNotificationChannel(notificationChannel);
mNotificationManager.notify(1, mBuilder.build())