java - Android IntentService无法启动通知

Question

这是我的full code

启动通知在 Service 中运行良好，但是当我将服务更改为 IntentService 时，通知不显示，这是我的服务:

public class MyIntentService extends IntentService {
    public MyIntentService() {
        super("MyIntentService");
    }

    Context ctx;
    String channelId;

    @Override
    protected void onHandleIntent(Intent intent) {
        ctx = getApplicationContext();
        channelId = getPackageName() + " Channel";
        createNotificationChannel();
        startForeground(1, getNotification());
    }

    Notification getNotification() {
        return new NotificationCompat.Builder(ctx, channelId)
                .setContentTitle("Title")
                .setContentText("Content")
                .setSmallIcon(R.drawable.ic_android_black_24dp)
                .build();
    }

    private void createNotificationChannel() {

        // Create the NotificationChannel, but only on API 26+ because
        // the NotificationChannel class is new and not in the support library
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            String name = channelId + " Name";
            String description = channelId + " Desc";
            int importance = NotificationManager.IMPORTANCE_DEFAULT;
            NotificationChannel channel = new NotificationChannel(channelId, name, importance);
            channel.setDescription(description);
            // Register the channel with the system; you can't change the importance
            // or other notification behaviors after this
            NotificationManager notificationManager = getSystemService(NotificationManager.class);
            notificationManager.createNotificationChannel(channel);
        }
    }
}

我使用以下代码启动服务:

startService(new Intent(this, MyIntentService.class))

Answer 1

我找到了解决办法

IntentService无法使用startforeground，因为IntentService会在onHandleIntent之后停止，因此无法长时间前台通知(参见StartForeground for IntentService)

如果我想使用startForeground，请使用Service而不是IntentSerivce

如果我想在IntentService中使用通知，请使用NotificationManager#notify，请参阅以下代码:

public class MyIntentService extends IntentService {
    public MyIntentService() {
        super("MyIntentService");
    }

    Context ctx;
    String channelId;

    @Override
    protected void onHandleIntent(Intent intent) {
        initNotification();
    }

    private void initNotification() {
        ctx = getApplicationContext();
        channelId = getPackageName() + " Channel";
        createNotificationChannel();
//        startForeground(1, getNotification());
        NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        nm.notify(1, getNotification());
    }

    Notification getNotification() {
        return new NotificationCompat.Builder(ctx, channelId)
                .setContentTitle("Title")
                .setContentText("Content")
                .setSmallIcon(R.drawable.ic_android_black_24dp)
                .build();
    }

    private void createNotificationChannel() {

        // Create the NotificationChannel, but only on API 26+ because
        // the NotificationChannel class is new and not in the support library
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            String name = channelId + " Name";
            String description = channelId + " Desc";
            int importance = NotificationManager.IMPORTANCE_DEFAULT;
            NotificationChannel channel = new NotificationChannel(channelId, name, importance);
            channel.setDescription(description);
            // Register the channel with the system; you can't change the importance
            // or other notification behaviors after this
            NotificationManager notificationManager = getSystemService(NotificationManager.class);
            notificationManager.createNotificationChannel(channel);
        }
    }
}