Android studio 与MediaPlayer一起使用wave文件资源

我正试图学习Kotlin和Android Studio，方法是在Java中创建一个

MediaPlayer

并播放一个wave文件。我正在尝试使代码适应Kotlin：

MainActivity.kt

：

package com.example.debugwaveres

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.content.Context
import android.media.MediaPlayer
import android.view.View

//class MainActivity(private val context: Context) : AppCompatActivity() {
class MainActivity : AppCompatActivity() {
    private var player: MediaPlayer? = null
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }
    fun play(view: View) {
        if (player == null) {
            player = MediaPlayer.create(this, R.raw.metro1)
            player?.setOnCompletionListener {
                //stopPlayer()
            }
        }
        player?.start()
    }
}

.wav

资源

R.raw.metro1

已复制到

res/raw

资源目录：

---

---

活动\u main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:gravity="center"
    android:orientation="vertical" >

    <Button
        android:layout_width="99dp"
        android:layout_height="wrap_content"
        android:onClick="play"
        android:text="Play" />

</LinearLayout>

---

我试过你的密码。它很好用。但你可以这样尝试：

fun play(view : View) {
    if (player == null) {
        player = MediaPlayer.create(this, R.raw.metro1)
        player?.setOnCompletionListener {
            //stopPlayer()
        }
    }
    player?.setOnPreparedListener {
        it.start()
    }
}

fun play(view : View) {
    if (player == null) {
        player = MediaPlayer.create(this, R.raw.metro1)
        player?.setOnCompletionListener {
            //stopPlayer()
        }
    }
    player?.setOnPreparedListener {
        it.start()
    }
}