首页 > 解决方案 > startForeground() 不显示任何通知

问题描述

我想启动一个后台服务,即使应用程序关闭它仍然运行,

为此,我使服务开始变得有粘性,并使其成为一个过程。问题仍然存在,所以我做了一些研究,发现在最近的 Android 设备中,我们必须在前台启动此类服务:-通过使用 startForegroundService 启动服务,-并在服务的 onStartCommand 中 startForeground,-显示具有恒定通道的通知.

我这样做了,但同样的问题,前台服务的通知没有显示,

我的服务的 onStartCommand :

  @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        super.onStartCommand(intent,flags,startId);

        Intent intent2 = new Intent(this, RDVSearchService.class);
        intent2.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent2, 0);

        Notification.Builder builder = new Notification.Builder(getApplicationContext())
                .setContentTitle("Pratikk")
                .setContentText("Subject")
                .setSmallIcon(R.drawable.ok_done)
                .setContentIntent(pendingIntent);

        Notification notif;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            notif = builder.build();
        }else{
            notif = builder.getNotification();
        }

        startForeground(1234, notif);

        return START_STICKY;
    }

我如何启动服务:

Intent intent = new Intent(context, RDVSearchService.class);

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    context.startForegroundService(intent);
}else{
    context.startService(intent);
}

我在 Manifest 中的服务声明:

<service
android:name=".services.RDVSearchService"
android:exported="false"
android:process=":rdv_search" />

标签: androidandroid-intentandroid-serviceandroid-notificationsforeground-service

解决方案


从 android 8.0 开始,必须创建频道。

    String channelId = "channelId";
    NotificationCompat.Builder builder = new NotificationCompat.Builder(getApplicationContext(), channelId)
            .setContentTitle("Pratikk")
            .setContentText("Subject")
            .setSmallIcon(R.drawable.ok_done)
            .setContentIntent(pendingIntent);
    startForeground(1234, builder.build());
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        NotificationChannel channel = new NotificationChannel(channelId,
                "name", NotificationManager.IMPORTANCE_LOW);
        channel.setDescription("description");
        channel.enableLights(false); // light
        channel.enableVibration(false); // vibration
        NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        if (manager != null) {
            manager.createNotificationChannel(channel);
        }
    }

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