設定setOnCompletionListenerandroidstudiokotlin后，音頻檔案仍然回圈

我已將 setOnCompletionListener 添加到我的代碼中，但音頻檔案在完成后仍然繼續回圈（從 firebase 存盤 URL 檢索的音頻檔案）......我不太確定問題是什么，因為我添加的代碼似乎挺好的...

這是允許用戶播放音頻檔案的活動的代碼

class DetailActivity : AppCompatActivity() {

private lateinit var imageViewClass: ImageView
private lateinit var textViewClassName: TextView
private lateinit var textViewClassDes: TextView
private lateinit var textViewClassContent: TextView
private var stop:Boolean = false
var mediaPlayer: MediaPlayer? = null
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_detail)

    val btnPlay: Button = findViewById(R.id.btnPlay)
    val btnStop: Button = findViewById(R.id.btnStop)


    imageViewClass = findViewById(R.id.imageViewClassImage)
    textViewClassName = findViewById(R.id.textViewClassName)
    textViewClassDes = findViewById(R.id.textViewClassDescription)
    textViewClassContent = findViewById(R.id.textViewClassContent)


    val classImage = intent.getStringExtra("class_image")
    val className = intent.getStringExtra("class_name")
    val classDes = intent.getStringExtra("class_des")
    val classContent = intent.getStringExtra("class_content")
    val classAudio = intent.getStringExtra("class_audio")

    Glide.with(this)
        .load(classImage)
        .centerCrop()
        .into(imageViewClass)
    textViewClassName.text = className
    textViewClassDes.text = classDes
    textViewClassDes.text = classDes!!.replace("\\n", "\n")
    textViewClassContent.text = classContent
    textViewClassContent.text = classContent!!.replace("\\n", "\n")

    btnPlay.isEnabled = true
    btnStop.isEnabled = false

    btnPlay.setOnClickListener(object : View.OnClickListener {
        override fun onClick(v: View?) {
            if (mediaPlayer == null) {
                mediaPlayer = MediaPlayer.create(this@DetailActivity, Uri.parse(classAudio))
                mediaPlayer!!.isLooping = true
                mediaPlayer!!.start()
                btnStop.isEnabled = true
                btnPlay.isEnabled = false
                Toast.makeText(applicationContext, "Audio Starts", Toast.LENGTH_SHORT).show()
            } else {
                mediaPlayer!!.start()
            }
        }
    })

    mediaPlayer?.setOnCompletionListener {
        btnPlay.isEnabled = true
        btnStop.isEnabled = false
        mediaPlayer!!.stop()
        mediaPlayer!!.reset()
        mediaPlayer!!.release()
        Toast.makeText(applicationContext, "end", Toast.LENGTH_SHORT).show()
    }

    btnStop.setOnClickListener(object : View.OnClickListener {
        override fun onClick(v: View?) {
            if(mediaPlayer!!.isPlaying){
                stop = false
                mediaPlayer!!.stop()
                mediaPlayer!!.reset()
                mediaPlayer!!.release()
                mediaPlayer = null
                btnPlay.isEnabled = true
                btnStop.isEnabled = false
                Toast.makeText(applicationContext,"Audio Stops",Toast.LENGTH_SHORT).show()
            }
        }
    })
}

override fun onDestroy(){
    super.onDestroy()
    if(mediaPlayer != null){
        mediaPlayer!!.stop()
        mediaPlayer!!.reset()
        mediaPlayer!!.release()
        mediaPlayer = null
    }
}

}

uj5u.com熱心網友回復：

您不會在片段創建期間創建媒體播放器。所以在通話期間：

mediaPlayer?.setOnCompletionListener {
        btnPlay.isEnabled = true
        btnStop.isEnabled = false
        mediaPlayer!!.stop()
        mediaPlayer!!.reset()
        mediaPlayer!!.release()
        Toast.makeText(applicationContext, "end", Toast.LENGTH_SHORT).show()
    }

mediaPlayer 始終為空。因此永遠不會設定偵聽器。

只需在創建 mediaPlayer 后將此代碼移動到 onClick 方法

uj5u.com熱心網友回復：

我嘗試了兩種方式：

        btnPlay.setOnClickListener(object : View.OnClickListener {
        override fun onClick(v: View?) {
            mediaPlayer?.setOnCompletionListener {
                btnPlay.isEnabled = true
                btnStop.isEnabled = false
                mediaPlayer!!.stop()
                mediaPlayer!!.reset()
                mediaPlayer!!.release()
                Toast.makeText(applicationContext, "end", Toast.LENGTH_SHORT).show()
            }
            if (mediaPlayer == null) {
                mediaPlayer = MediaPlayer.create(this@DetailActivity, Uri.parse(classAudio))
                mediaPlayer!!.isLooping = true
                mediaPlayer!!.start()
                btnStop.isEnabled = true
                btnPlay.isEnabled = false
                Toast.makeText(applicationContext, "Audio Starts", Toast.LENGTH_SHORT).show()
            } else {
                mediaPlayer!!.start()
            }
        }
    })

和

btnPlay.setOnClickListener(object : View.OnClickListener {
        override fun onClick(v: View?) {
            if (mediaPlayer == null) {
                mediaPlayer = MediaPlayer.create(this@DetailActivity, Uri.parse(classAudio))
                mediaPlayer?.setOnCompletionListener {
                    btnPlay.isEnabled = true
                    btnStop.isEnabled = false
                    mediaPlayer!!.stop()
                    mediaPlayer!!.reset()
                    mediaPlayer!!.release()
                    Toast.makeText(applicationContext, "end", Toast.LENGTH_SHORT).show()
                }
                mediaPlayer!!.isLooping = true
                mediaPlayer!!.start()
                btnStop.isEnabled = true
                btnPlay.isEnabled = false
                Toast.makeText(applicationContext, "Audio Starts", Toast.LENGTH_SHORT).show()
            } else {
                mediaPlayer!!.start()
            }
        }
    })

但仍然不起作用..

標籤：安卓 科特林 安卓媒体播放器

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