安卓 - 当设备插入音频插孔时播放声音

Question

我希望在设备插入音频插孔时（不仅限于耳机），可以播放音频文件，与Android 4.3及以上版本有关，如有必要，我愿意获取root权限。

以下是我目前尝试过的方法：

1. Some kind of hack but it is not working.

    try {
       Class audioSystemClass = Class.forName("android.media.AudioSystem");
       Method setForceUse = audioSystemClass.getMethod("setForceUse", int.class, int.class);
       setForceUse.invoke(null, 1, 1);
   
       MediaPlayer mp = MediaPlayer.create(this, R.raw.bad);
       mp.start();
   
   } catch (ClassNotFoundException e) {
       Log.d("mediaException", "class", e);
   } catch (NoSuchMethodException e) {
       Log.d("mediaException", "method", e);
   } catch (IllegalAccessException e) {
       Log.d("mediaException", "access", e);
   } catch (InvocationTargetException e) {
       Log.d("mediaException", "invocation", e);
   }
   

2. Found this here in some thread but it is also not working:

   AudioManager audioManager = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE);
   
   audioManager.setMode(AudioManager.MODE_NORMAL);
   audioManager.setSpeakerphoneOn(true);
   
   MediaPlayer mp = MediaPlayer.create(this, R.raw.bad);
   mp.start();
   

3. Using MediaRouter class I tried to get available routes. But when something is plugged in audio jack only route available is "Headphones".

   MediaRouter router = (MediaRouter) this.getSystemService(Context.MEDIA_ROUTER_SERVICE);
   
   for (int i = 0; i < router.getRouteCount(); i++) {
       Log.d("playSound", router.getRouteAt(i).toString());
   }
   

- Koc

---

它到底是怎么不工作的？ - ozbek

这不是一种预期/正常的行为吗？ - ozbek

你没有提到你在播放中使用哪种流类型。这非常重要。 - Michael

@Michael，我不确定你在说什么？ - Koc

我尝试添加以下代码：MediaPlayer mp = MediaPlayer.create(this, R.raw.bad); mp.setAudioStreamType(AudioManager.STREAM_MUSIC); 但是这个hack仍然无效（设备：Nexus 5） - Koc

Answer 1

在清单文件中添加权限使用也很重要：

<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />

- Fedir Tsapana

Answer 2

我发现如何实现这个。请注意，MediaPlayer和AudioManager处于相同的模式中。我在Nexus 5 (4.4.2)上尝试过。

        final AudioManager audioManager = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE);
        audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
        audioManager.setSpeakerphoneOn(true);

        MediaPlayer mp = null;
        mp = MediaPlayer.create(this, R.raw.bad);
        mp.setAudioStreamType(AudioManager.MODE_IN_COMMUNICATION);
        mp.start();

- Koc