Android 8.1通知显示但没有发出声音

Question

我有一项服务，其中包括秒表，在前台运行。 服务启动时，会显示通知，结束时，我会用声音和一些表明其已完成的文本进行更新。 问题在于，此方法在api 25之前效果良好，但是对于26和27，它可以正常更新通知，但不会发出声音。 以下是相关代码：

在服务内部创建通知：

mBuilder = new NotificationCompat.Builder(context, "Main")
            .setSmallIcon(R.drawable.ic_notification_temp)
            .setContentTitle(step.getDescription())
            .setContentText(getString(R.string.notification_text))
            .setVisibility(VISIBILITY_PUBLIC)
            .setOngoing(true);
            .setDeleteIntent(deletePendingIntent);
            .setContentIntent(contentPendingIntent);
            .addAction(R.drawable.ic_stop_red_24dp, getString(R.string.cancel),finnishPendingIntent);

mNotificationManager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(mId, mBuilder.build());

“工作”完成时对通知构建器的更新：

mBuilder.setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION));        
mBuilder.setVibrate(new long[]{0, 300, 0, 400, 0, 500});
mBuilder.setOngoing(false);
mBuilder.setAutoCancel(true);
mBuilder.setContentText(getString(R.string.notification_finished_text));

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    mBuilder.setChannelId("Sound");
    mBuilder.setCategory(NotificationCompat.CATEGORY_ALARM);
}
mNotificationManager.notify(mId, mBuilder.build());

仅在应用启动时为api 26或更高版本创建的2个通道：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    // Create the normal NotificationChannel
    CharSequence name = getString(R.string.app_name);
    int importance = NotificationManager.IMPORTANCE_LOW;
    NotificationChannel channel = new NotificationChannel("Main", name, importance);
    // Register the channel with the system; you can't change the importance
    // or other notification behaviors after this
    NotificationManager notificationManager = (NotificationManager) getSystemService(
            NOTIFICATION_SERVICE);
    notificationManager.createNotificationChannel(channel);

    // Create theNotificationChannel with sound
    importance = NotificationManager.IMPORTANCE_HIGH;
    name = getString(R.string.notification_channel_sound);
    NotificationChannel sound = new NotificationChannel("Sound", name, importance);
    sound.enableVibration(true);
    sound.setVibrationPattern(new long[]{0, 300, 0, 400, 0, 500});
    AudioAttributes aa = new AudioAttributes.Builder()
            .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
            .setLegacyStreamType(AudioManager.STREAM_NOTIFICATION)
            .setUsage(AudioAttributes.USAGE_NOTIFICATION_EVENT)
            .build();
    sound.setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION), aa);
    notificationManager.createNotificationChannel(sound);
}

那就是我现在的位置。 我试过不使用setsound（），因为我读到通知应该只播放具有适当重要性的默认声音（当然，我什至在尝试正确更新频道设置之间甚至卸载了该应用程序），但是没有似乎适用于api 26，但我只是不知道自己在做什么错。

Answer 1

试图重现您的问题并完成创建的MVP，也许这将有助于您发现问题：

活动：

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        View btn = findViewById(R.id.clickMe);
        btn.setTag(NotifService.CHANNEL_ID_MAIN);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String channelId = (String) v.getTag();
                Intent intent = new Intent(v.getContext(), NotifService.class);
                intent.putExtra(NotifService.TAG, channelId);
                if (channelId.equals(NotifService.CHANNEL_ID_MAIN)) {
                    v.setTag(NotifService.CHANNEL_ID_SOUND);
                } else {
                    v.setTag(NotifService.CHANNEL_ID_MAIN);
                }
                v.getContext().startService(intent);
            }
        });
    }
}

服务：

public class NotifService extends IntentService {
    public static final String TAG = "NotificationService";
    public static final String CHANNEL_ID_MAIN = "Main";
    public static final String CHANNEL_ID_SOUND = "Sound";
    public static final int NOTIFICATION_ID = 123;

    /**
     * Creates an IntentService.  Invoked by your subclass's constructor.
     */
    public NotifService() {
        super(TAG);//Used to name the worker thread, important only for debugging.
    }

    @Override
    public void onCreate() {
        super.onCreate();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel(CHANNEL_ID_MAIN, "Channel Main", NotificationManager.IMPORTANCE_LOW);
        NotificationChannel sound = new NotificationChannel(CHANNEL_ID_SOUND, "Channel Sound", NotificationManager.IMPORTANCE_HIGH);
            sound.enableVibration(true);
            sound.setVibrationPattern(new long[]{0, 300, 0, 400, 0, 500});
            AudioAttributes aa = new AudioAttributes.Builder()
                    .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
                    .setLegacyStreamType(AudioManager.STREAM_NOTIFICATION)
                    .setUsage(AudioAttributes.USAGE_NOTIFICATION_EVENT)
                    .build();
            sound.setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION), aa);
            NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
            if (notificationManager != null) {
                notificationManager.createNotificationChannel(channel);
                notificationManager.createNotificationChannel(sound);
            }
        }
    }

    @Override
    protected void onHandleIntent(@Nullable Intent intent) {
        String channelId = intent.getStringExtra(TAG);
        showNotification(channelId);
    }

    private void showNotification(String channelId) {
        boolean inProgress = channelId.equals(CHANNEL_ID_MAIN);
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this, channelId)
                .setSmallIcon(R.drawable.ic_launcher_foreground)
                .setContentTitle("Work")
                .setContentText(inProgress ? "InProgress" : "Finished")
                .setOngoing(inProgress)
                .setVisibility(VISIBILITY_PUBLIC)
                .setAutoCancel(!inProgress);

        if (!inProgress) {
            builder.setCategory(NotificationCompat.CATEGORY_ALARM);
        }

        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        if (notificationManager != null) {
            notificationManager.notify(NOTIFICATION_ID, builder.build());
        }
    }
}

这在我的设备8.1和Emulator 8.1上效果很好（第一次单击时无声音，第一次通知时发出振动+声音，但未通知工作完成通知）。

Answer 2

我的大多数模拟器AVD都存在完全相同的问题。 以下为我修复了它：

• 启动受影响的AVD
• 长按AVD的电源按钮
• 重新启动AVD

之后，它应该再次工作。