Android 通知没有出现？

这是我的通知生成器功能：

public class NotificationHelper {

final static String CHANNEL_ID = "MY_CHANNEL_ID";
final static String CHANNEL_NAME = "MY_CHANNEL_NAME";


public static Notification buildNotificationInstance(Context ctx, String title, String message) {

    Notification notification;
    NotificationCompat.Builder mBuilder;

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        NotificationChannel notificationChannel = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH);
        mBuilder = new NotificationCompat.Builder(ctx, CHANNEL_ID);
    } else {
        mBuilder = new NotificationCompat.Builder(ctx);
    }

    mBuilder.setContentTitle(title)
            .setContentText(message)
            .setSmallIcon(R.drawable.ic_android_black_24dp);

    Bitmap bm = BitmapFactory.decodeResource(ctx.getResources(), R.mipmap.ic_launcher);
    mBuilder.setLargeIcon(bm);


    notification = mBuilder.build();


    return notification;
    }
}

我尝试在活动的onCreate（）上显示通知：

通知没有显示。我做错了什么

---

我在Android 8上进行测试，您还必须为notificationBuilder添加PendingEvent，如下所示：

PendingIntent pendingIntent = PendingIntent.getActivity(this, 0/*Request code*/, intent, PendingIntent.FLAG_ONE_SHOT);

mBuilder.setContentTitle(title)
        .setContentText(message)
        .setSmallIcon(R.drawable.ic_android_black_24dp)
        .setContentIntent(pendingIntent);

---

您必须创建通知通道才能使其工作： 试试这个：

 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        NotificationChannel notificationChannel = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH);
        mBuilder = new NotificationCompat.Builder(ctx, CHANNEL_ID);

        notificationChannel.setDescription("description");
        notificationChannel.enableLights(true);
        NotificationManager notificationManager = (NotificationManager) ctx.getSystemService(NOTIFICATION_SERVICE);
        notificationManager.createNotificationChannel(notificationChannel);
    }

---

为什么？当单击导航错误时，您还需要添加意图以使应用程序导航到您想要的活动。通知并非每次都用于打开活动。另外，它也不起作用：）是的，我知道，我的意思是如果你想导航到另一个活动，试试empulater或者8号以下的手机，我想在8号手机中你可能需要添加一些不同的东西，只是为了检查代码或安卓版本的问题安卓SDK的一致性和清晰性，一如往常。坦克兄弟。

 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        NotificationChannel notificationChannel = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH);
        mBuilder = new NotificationCompat.Builder(ctx, CHANNEL_ID);

        notificationChannel.setDescription("description");
        notificationChannel.enableLights(true);
        NotificationManager notificationManager = (NotificationManager) ctx.getSystemService(NOTIFICATION_SERVICE);
        notificationManager.createNotificationChannel(notificationChannel);
    }