Android：媒体按键消息

具体的使用方法：

用 AudioManager 对象注册一个 MediaoButtonRecevie，让它成为 MEDIA_BUTTON。

  audioManager = context.getSystemService(Context.AUDIO_SERVICE) as AudioManager  audioManager!!.registerMediaButtonEventReceiver(ComponentName(context,MusicIntentReceiver::class.java!!))

广播必须在 AndroidManifest.xml 文件中进行声明，否则就监听不到该 MEDIA_BUTTON 广播了。

创建 MusicIntentReceiver 类

    class MusicIntentReceiver : BroadcastReceiver() {        override fun onReceive(context: Context, intent: Intent) {            LogManager.info("onReceive" + intent.action)            if (intent.action == android.media.AudioManager.ACTION_AUDIO_BECOMING_NOISY) {            } else if (intent.action == Intent.ACTION_MEDIA_BUTTON) {                val keyEvent = intent.extras!!.get(Intent.EXTRA_KEY_EVENT) as KeyEvent                LogManager.info("action:" + intent.action + "    keycode:" + keyEvent.keyCode)                when (keyEvent.keyCode) {                    KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE -> {                                        }                    KeyEvent.KEYCODE_MEDIA_PLAY -> {                    }                    KeyEvent.KEYCODE_MEDIA_PAUSE -> {                                          }                    KeyEvent.KEYCODE_MEDIA_STOP -> {                                         }                    KeyEvent.KEYCODE_MEDIA_NEXT -> {                                      }                    KeyEvent.KEYCODE_MEDIA_PREVIOUS -> {                                     }                }            }    }

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