时间戳

首页 > 解决方案 > Android 通知不会显示在设备上

android - Android 通知不会显示在设备上

问题描述

我无法弄清楚为什么此通知不会显示在设备上。我正在使用的设备正在运行 OS9。任何帮助都会很棒！ 

 @Override
public void onMessageReceived(RemoteMessage remoteMessage) {

    super.onMessageReceived(remoteMessage);
    Log.d("TestApp", "Notification Received : " + remoteMessage.getData());


    NotificationUtils.getInstance(getApplicationContext()).createChannel(NotificationUtils.DEFAULT_CHANNEL);
    NotificationCompat.Builder notification = buildBasicNotification(getApplicationContext(), remoteMessage.getFrom(), remoteMessage.getData().get("_msg"), NotificationUtils.DEFAULT_CHANNEL);
    displayNotification(notification);

}

public static NotificationCompat.Builder buildBasicNotification(Context context, String title, String msgText, String channelId) {

    NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
            .setContentTitle(title)
            .setContentText(msgText)
            .setSmallIcon(R.drawable.alert_icon)
            .setAutoCancel(false);

    return builder;
}


private void displayNotification(NotificationCompat.Builder builder) {
    NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    manager.notify(0, builder.build());
}

这是 NotificationUtils 中的两个重要方法

public static NotificationUtils getInstance(Context context) {
    if (instance == null) {
        instance = new NotificationUtils(context);
    }

    return instance;
}

NotificationUtils(Context context) {
    super(context);
    this.context = context;
    notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        createAlertChannel();
        deleteChannel("Miscellaneous");
    }
}

标签： androidnotifications

解决方案

我终于明白了

错误在此方法内部。

public static NotificationCompat.Builder buildBasicNotification(Context context, String title, String msgText, String channelId) {

    NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
            .setContentTitle(title)
            .setContentText(msgText)
            .setSmallIcon(R.drawable.alert_icon)
            .setAutoCancel(false);

    return builder;
}

确保NotificationCompat.Builder builder = new NotificationCompat.Builder(context)接收到 channelId。

所以应该是...NotificationCompat.Builder builder = new NotificationCompat.Builder(context, channelId)

推荐阅读