在Android Studio中使用Kotlin构建一个简单的MediaPlayer。无法获取要流式传输的URL dataSource

import android.media.MediaPlayer
import android.os.Bundle
import android.view.View
import android.widget.Button
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity

class MainActivity : AppCompatActivity() {
    private lateinit var mediaPlayer: MediaPlayer
    private lateinit var playButton: Button
    private lateinit var statusTextView: TextView

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        mediaPlayer = MediaPlayer()
        playButton = findViewById(R.id.playButton)
        statusTextView = findViewById(R.id.statusTextView)

        playButton.setOnClickListener {
            if (mediaPlayer.isPlaying) {
                mediaPlayer.pause()
                playButton.text = "Play"
                statusTextView.text = "Paused"
            } else {
                mediaPlayer.start()
                playButton.text = "Pause"
                statusTextView.text = "Playing"
            }
        }
    }

    override fun onDestroy() {
        super.onDestroy()
        mediaPlayer.release()
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/playButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Play" />

    <TextView
        android:id="@+id/statusTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Stopped" />

</LinearLayout>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.mediaplayer">

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

    <application
        ...
    </application>

</manifest>

val dataSource = "http://example.com/audio.mp3"
mediaPlayer.setDataSource(dataSource)
mediaPlayer.prepareAsync()