Android 通知声音有问题

我正在尝试测试通知。我已经创建了一个启用音频播放的模拟器。我可以得到通知，但我听不到声音。有什么问题吗？是否有我缺少的设置

NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(ns);
        int icon = R.drawable.icon;
        CharSequence tickerText = "Hello";
        CharSequence contentTitle = "My notification";  // expanded message title
        CharSequence contentText = "Hello";      // expanded message text

        Intent notificationIntent = new Intent("ABC");
        PendingIntent contentIntent = PendingIntent.getActivity(context, 0, notificationIntent, 0);

        long when = System.currentTimeMillis();

        Notification notification = new Notification(icon, tickerText, when);

        notification.defaults |= Notification.DEFAULT_SOUND;

        notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);


        mNotificationManager.notify(HELLO_ID, notification);

当我看到logcat时，我有以下堆栈跟踪

09-20 15:44:47.297: DEBUG/MediaPlayer(62): Couldn't open file on client side, trying server side
09-20 15:44:47.347: ERROR/MediaPlayerService(34): Couldn't open fd for content://settings/system/notification_sound
09-20 15:44:47.347: ERROR/MediaPlayer(62): Unable to to create media player
09-20 15:44:47.415: WARN/NotificationService(62): error loading sound for content://settings/system/notification_sound
09-20 15:44:47.415: WARN/NotificationService(62): java.io.IOException: setDataSource failed.: status=0x80000000
09-20 15:44:47.415: WARN/NotificationService(62):     at android.media.MediaPlayer.setDataSource(Native Method)
09-20 15:44:47.415: WARN/NotificationService(62):     at android.media.MediaPlayer.setDataSource(MediaPlayer.java:714)
09-20 15:44:47.415: WARN/NotificationService(62):     at android.media.MediaPlayer.setDataSource(MediaPlayer.java:669)
09-20 15:44:47.415: WARN/NotificationService(62):     at com.android.server.NotificationPlayer$CreationAndCompletionThread.run(NotificationPlayer.java:88)

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我能够通过在SD卡上给它一个不同的文件来获得通知声音播放。我在播放默认声音时遇到问题。我不确定默认的声音是什么。当我进入设置，看到默认的声音-它只有一个选项，即沉默。我也无法改变它。

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所以可能没有默认通知的声音，因此我得到了那个错误，尽管我们假设，会有一个合理的默认。

thisisanath的想法是正确的。阅读之后，我添加了指定的目录结构，并将声音文件推送到DDMS中的

/mnt/sdcard/media/audio/notifications

目录。（我认为

C:\ProgramFiles（x86）\Android\Android sdk\platforms\Android-14\data\res\raw\fallbackring.ogg

发出了很好的通知声音。）在模拟器中，我卸载了SD卡，然后重新安装了SD卡。通知铃声设置除“静音”外还有“钴”，选择该选项后，我的通知声音工作正常