Android Studio Mediaplayer how to fade in and out

Question

I am working with the mediaplayer class in android studio. I simply want to fade out one sound and fade in the other sound instead of using setVolume(0,0) and setVolume(1,1).

Answer 1

Here's the fade-out code in case it saves someone some time.

This also includes a stopPlayer() function to release the MediaPlayer from memory. It's a good practice to do so.

// Set to the volume of the MediaPlayer
float volume = 1;

private void startFadeOut(){

    // The duration of the fade
    final int FADE_DURATION = 3000;

    // The amount of time between volume changes. The smaller this is, the smoother the fade
    final int FADE_INTERVAL = 250;

    // Calculate the number of fade steps
    int numberOfSteps = FADE_DURATION / FADE_INTERVAL;

    // Calculate by how much the volume changes each step
    final float deltaVolume = volume / numberOfSteps;

    // Create a new Timer and Timer task to run the fading outside the main UI thread
    final Timer timer = new Timer(true);
    TimerTask timerTask = new TimerTask() {
        @Override
        public void run() {

            //Do a fade step
            fadeOutStep(deltaVolume);

            //Cancel and Purge the Timer if the desired volume has been reached
            if(volume <= 0){
                timer.cancel();
                timer.purge();
                stopPlayer();
            }
        }
    };

    timer.schedule(timerTask,FADE_INTERVAL,FADE_INTERVAL);
}

private void fadeOutStep(float deltaVolume){
    player.setVolume(volume, volume);
    volume -= deltaVolume;
}

// Release the player from memory
private void stopPlayer() {

    if (player != null) {

        player.release();
        player = null;
    }
}