android studio - MediaPlayer getting path from device

Question

I'm having trouble getting the audio file path and sending him to mediaPlayer.create below is the code I have to get the file path. the control sound function is to receive the file and play.

    val resolver: ContentResolver = contentResolver
    val uri = android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
    val cursor: Cursor? = resolver.query(uri, null, null, null, null)
    when {
        cursor == null -> {
            // query failed, handle error.
        }
        !cursor.moveToFirst() -> {
            // no media on the device
        }
        else -> {
            val titleColumn: Int = cursor.getColumnIndex(android.provider.MediaStore.Audio.Media.TITLE)
            val idColumn: Int = cursor.getColumnIndex(android.provider.MediaStore.Audio.Media._ID)
            do {
                val thisId = cursor.getLong(idColumn)
                val thisTitle = cursor.getString(titleColumn)
                // ...process entry...
            } while (cursor.moveToNext())
        }
    }
    cursor?.close()

    val id: Long = 0
    val contentUri: Uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
        ContentUris.withAppendedId(android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, id )
        controlSound(contentUri)

    mp = MediaPlayer().apply {
        setAudioStreamType(AudioManager.STREAM_MUSIC)
        setDataSource(applicationContext, contentUri)
    }
}


private fun controlSound(id: Uri){
    fab_play.setOnClickListener{

        if (mp == null){
            mp = MediaPlayer.create(this, id)
            Log.d("MediaPlayer", "ID: ${mp!!.audioSessionId}")

            initialiseSeekBar()
        }
        mp?.start()
        Log.d("MediaPlayer", "Duration: ${mp!!.duration/1000} seconds")
    }

}

Answer 1

等待大神答复