Android SoundPool is not playing wav format sound

Question

I'am trying to play .wav format sounds from raw resource file when i click to the button but nothing happens when i click to the button and there is no logcat error.

My MainActivity.kt:

 package com.example.exampleofmusicapp

       import android.media.AudioAttributes
       import android.media.AudioManager
       import android.media.SoundPool
       import android.os.Build
       import androidx.appcompat.app.AppCompatActivity
       import android.os.Bundle
       import android.view.View


    class MainActivity : AppCompatActivity() {

    lateinit var soundPool: SoundPool

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

        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP){
            var audioAttrs: AudioAttributes = AudioAttributes.Builder()
                .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
                .setUsage(AudioAttributes.USAGE_MEDIA)
                .build()

             soundPool = SoundPool.Builder()
                .setMaxStreams(2)
                .setAudioAttributes(audioAttrs)
                .build()
        }

        else{
            soundPool = SoundPool(2, AudioManager.STREAM_MUSIC, 0)
        }

    }

    fun playSound1(view: View) {
        val sound1 = soundPool.load(this, R.raw.sound1, 1)
        soundPool.play(sound1, 1.0f, 1.0f, 1, 0, 1.0f)
    }

    }

Edit: I have tried this in 2 emulator and a real device but it is not working.

Answer 1

It takes time to load the sound file into memory so change val sound1 to var sound1, make it global and instantiate it at the end of the onCreate method like so:

class MainActivity : AppCompatActivity() {

    lateinit var soundPool: SoundPool
    var sound1 : Int = 0

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

        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP){
            var audioAttrs: AudioAttributes = AudioAttributes.Builder()
                    .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
                    .setUsage(AudioAttributes.USAGE_MEDIA)
                    .build()

            soundPool = SoundPool.Builder()
                    .setMaxStreams(2)
                    .setAudioAttributes(audioAttrs)
                    .build()
        }

        else{
            soundPool = SoundPool(2, AudioManager.STREAM_MUSIC, 0)
        }
        sound1 = soundPool.load(this, R.raw.sound1, 1)

    }

    fun playSound1(view: View) {
        if(sound1 != 0) {
            soundPool.play(sound1, 1.0f, 1.0f, 1, 0, 1.0f)
        }
    }

}

Then you could check sound1 value and if it's not equal to 0 so it loaded completely. Also you could use setOnLoadCompleteListener method of SoundPool to check this.