Android 状态栏中未显示前台服务通知

Question

我已经在 SO 上尝试了各种解决方案，但似乎无法使它们中的任何一个起作用。通知根本不会显示。谁能指出我的代码中可能存在的问题？

private void startRunningInForeground() {

        setupNotificationChannel();

        Intent showTaskIntent = new Intent(getApplicationContext(), MainActivity.class);
        showTaskIntent.setAction(Intent.ACTION_MAIN);
        showTaskIntent.addCategory(Intent.CATEGORY_LAUNCHER);
        showTaskIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

        PendingIntent contentIntent = PendingIntent.getActivity(
                getApplicationContext(),
                0,
                showTaskIntent,
                PendingIntent.FLAG_UPDATE_CURRENT);

        NotificationCompat.Builder builder = new NotificationCompat.Builder(this, SERVICE_NOTIFICATION_CHANNEL);
        builder.setSmallIcon(R.drawable.ic_stat_ic_logo);
        builder.setContentTitle(getString(R.string.merge_notif_title));
        builder.setContentText(getString(R.string.merge_notif_description));
        builder.setContentIntent(contentIntent);
        builder.setWhen(System.currentTimeMillis());
        builder.setAutoCancel(false);
        builder.setOngoing(true);

        startForeground(NOTIFICATION_ID, builder.build());
    }

    private void setupNotificationChannel() {
        // Only run this on versions of Android that require notification channels.
        if(Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
            return;
        }

        NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        if(notificationManager == null) {
            return;
        }

        NotificationChannel cachingChannel = new NotificationChannel(SERVICE_NOTIFICATION_CHANNEL,
                getString(R.string.merge_channel), NotificationManager.IMPORTANCE_HIGH);
        cachingChannel.setDescription(getString(R.string.merge_channel_description));
        cachingChannel.enableLights(false);
        cachingChannel.enableVibration(false);

        notificationManager.createNotificationChannel(cachingChannel);
    }

没有收到任何错误消息，正在创建通知渠道，因为我在应用程序设置中看到了它。

Answer 1

你的 startForeground 是做什么的？

尝试修改它并确保您的 os > Android 8.0

顺便说一句，频道只需要创建一次。

PendingIntent contentIntent = PendingIntent.getActivity(
            getApplicationContext(),
            NOTIFICATION_ID, <---
            showTaskIntent,
            PendingIntent.FLAG_UPDATE_CURRENT);


startForeground(NOTIFICATION_ID, builder.build());
notificationManager.notify(NOTIFICATION_ID, builder.build()); <--

可能是因为Android O bg服务限制

//Start service:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
  startForegroundService(new Intent(this, YourService.class));
} else {
  startService(new Intent(this, YourService.class));
}

Answer 2

所以我能够通过扩展 Service 而不是 IntentService 来让它工作。我无法解释为什么会这样，但现在一切都按预期进行。

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