如何在kotlin中停止媒体播放器接听来电

class PhoneStateReceiver : BroadcastReceiver() {
    override fun onReceive(context: Context?, intent: Intent?) {
        val state = intent?.getStringExtra(TelephonyManager.EXTRA_STATE)
        if (state == TelephonyManager.EXTRA_STATE_RINGING) {
            // 停止媒体播放器
            stopMediaPlayer()
        }
    }
}

<receiver android:name=".PhoneStateReceiver">
    <intent-filter>
        <action android:name="android.intent.action.PHONE_STATE" />
    </intent-filter>
</receiver>

fun stopMediaPlayer() {
    if (mediaPlayer.isPlaying) {
        mediaPlayer.stop()
        mediaPlayer.release()
    }
}