Kotlin Android Media Player

Kotlin Android Media Player是一个用Kotlin语言编写的Android应用程序，它可以播放来自设备存储器或网络的音频和视频文件。Kotlin Android Media Player有很多功能，例如播放、暂停、停止、快进、快退、调整音量、自动播放下一个文件等。

功能

Kotlin Android Media Player有以下功能：

• 播放音频/视频文件
• 暂停音频/视频文件
• 停止音频/视频文件
• 快进音频/视频文件
• 快退音频/视频文件
• 调整音量
• 显示音频/视频文件的当前位置和时长
• 显示播放列表
• 自动播放下一个文件

技术

Kotlin Android Media Player使用了以下技术：

• Kotlin语言
• Android框架
• MediaPlayer API

示例代码

以下是Kotlin Android Media Player的示例代码：

class MainActivity : AppCompatActivity(), MediaPlayer.OnCompletionListener {

    private lateinit var mediaPlayer: MediaPlayer
    private lateinit var currentFile: String
    private lateinit var fileList: Array<String>
    private lateinit var listView: ListView

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

        // Get the list of audio files from the device storage or network
        fileList = arrayOf("audio_file_1.mp3", "audio_file_2.mp3", "audio_file_3.mp3")

        // Set up the ListView
        listView = findViewById(R.id.list_view)
        val adapter = ArrayAdapter(this, android.R.layout.simple_list_item_1, fileList)
        listView.adapter = adapter
        listView.setOnItemClickListener { _, _, position, _ ->
            // Play the selected audio file
            playAudioFile(fileList[position])
        }
    }

    private fun playAudioFile(fileName: String) {
        // Set the title of the activity
        title = fileName

        // Save the current file name
        currentFile = fileName

        // Create a new MediaPlayer object
        mediaPlayer = MediaPlayer()

        // Set the completion listener
        mediaPlayer.setOnCompletionListener(this)

        try {
            // Set the data source to the selected file
            val file = File(Environment.getExternalStorageDirectory().absolutePath + "/$fileName")
            val uri = Uri.fromFile(file)
            mediaPlayer.setDataSource(applicationContext, uri)

            // Set the audio stream type
            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC)

            // Prepare the MediaPlayer
            mediaPlayer.prepare()

            // Start playing the audio file
            mediaPlayer.start()
        } catch (e: IOException) {
            e.printStackTrace()
        }
    }

    override fun onCompletion(mediaPlayer: MediaPlayer) {
        // Auto-play the next audio file
        val currentIndex = fileList.indexOf(currentFile)
        if (currentIndex < fileList.size - 1) {
            playAudioFile(fileList[currentIndex + 1])
        }
    }

    override fun onPause() {
        super.onPause()
        // Pause the audio player when the activity is paused
        mediaPlayer.pause()
    }

    override fun onResume() {
        super.onResume()
        // Resume playing the audio when the activity is resumed
        mediaPlayer.start()
    }

    override fun onStop() {
        super.onStop()
        // Stop the audio player when the activity is stopped
        mediaPlayer.stop()
        mediaPlayer.release()
    }
}

结论

Kotlin Android Media Player是一个功能齐全的Android应用程序，用Kotlin编写的代码清晰简洁，并使用了最新的Android技术。如果您需要一个用于播放音频和视频文件的应用程序，您可以考虑使用Kotlin Android Media Player。