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我已经在手机上安装了该应用程序，并且在按下耳机上的按钮时会按预期执行回调，但在模拟器上它什么也不做。

使用以下代码生成媒体按钮按下：

adb shell input keyevent 126

有趣的是，我可以使用此命令停止拨出电话。

我什至在 Logcat 的输出中发现了按钮按下日志：

I/Input: injectKeyEvent: KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_MEDIA_PLAY, scanCode=0, metaState=0, flags=0x0, repeatCount=0, eventTime=46647423, downTime=46647423, deviceId=-1, source=0x101 }
I/Input: injectKeyEvent: KeyEvent { action=ACTION_UP, keyCode=KEYCODE_MEDIA_PLAY, scanCode=0, metaState=0, flags=0x0, repeatCount=0, eventTime=46647423, downTime=46647423, deviceId=-1, source=0x101 }

创建 MediaSession 的代码：

val callback = object : MediaSession.Callback() {
        override fun onPlay() = pressCounter.press()
        override fun onPause() = pressCounter.press()
        override fun onStop() = pressCounter.press()
    }

    mediaSession = MediaSession(applicationContext, "MYMS")

    mediaSession.setCallback(callback)
    mediaSession.setPlaybackState(
            PlaybackState.Builder().setActions(PlaybackState.ACTION_PLAY or
                    PlaybackState.ACTION_PAUSE or
                    PlaybackState.ACTION_PLAY_PAUSE)
                    .setState(PlaybackState.STATE_PLAYING,
                            0,
                            1f).build())
    mediaSession.isActive = true
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