Can't change volume correctly (setVolume)

Question

I'm working on an app that needs to play the system notification at different volume levels and have some issues with getting setVolume to work properly.

To debug this, I prepared a sample app with two buttons that allows me to play the system notification at a low or a high volume. So far, the app works, and the sound comes out of the speaker. However, no matter in which sequence I press the low and high volume buttons, once I have played the notification at a low volume, it stays low, I can't get it to play at the higher volume again.

Below is my code. I used an oncompletion callback to increment a counter and sound the notification 3 times.

public class MainActivity extends AppCompatActivity {

int soundsCounter = 0; // Counts how many times the notification has sounded
double playbackVolume = 1.0; // Playback volume of the notification
AudioManager audioManager;
MediaPlayer thePlayer;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //Setup the media player
    audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
    thePlayer = MediaPlayer.create(getApplicationContext(), RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION));

    // Initialize listener using setOnCompletionListener for mediaPlayer object
    // and declare new method OnComletionListener as an argument.
    thePlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
        // Override onCompletion method to apply desired operations.
        @Override
        public void onCompletion(MediaPlayer mediaPlayer){
            soundsCounter++;
            if (soundsCounter < 3){ // Sound the notification 3 times
                playNotification();
            }

        }
    } );
}

// Plays system notification at the selected volume
private void playNotification() {
    try {
        thePlayer.setVolume(((float) (audioManager.getStreamVolume(AudioManager.STREAM_NOTIFICATION) * playbackVolume)),
                (float) (audioManager.getStreamVolume(AudioManager.STREAM_NOTIFICATION) * playbackVolume));
    }
    thePlayer.start();
}


// Called when the user taps the HighV button
public void playHighV(View view) {
    soundsCounter = 0;
    playbackVolume = 1.0;
    playNotification();
}


// Called when the user taps the LowV button
public void playLowV(View view) {
    soundsCounter = 0;
    playbackVolume = 0.02;
    playNotification();
}

Any ideas where to look? Thanks!

Check out this post: https://stackoverflow.com/questions/5215459/android-mediaplayer-setvolume-function — oemel09, Jul 06 '19 at 09:16

score 0 · Answer 1 · answered Jul 06 '19 at 21:26

Thanks to Oemel09 I realized I was making some mistakes in the parameters passed to setVolume.

Here's the new code that works fine:

public class MainActivity extends AppCompatActivity {

int soundsCounter = 0; // Counts how many times the notification has sounded
float playbackVolume = 1; // Playback volume of the notification
AudioManager audioManager;
MediaPlayer thePlayer;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //Setup the media player
    audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
    thePlayer = MediaPlayer.create(getApplicationContext(), RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION));

    // Initialize listener using setOnCompletionListener for mediaPlayer object
    // and declare new method OnComletionListener as an argument.
    thePlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
        // Override onCompletion method to apply desired operations.
        @Override
        public void onCompletion(MediaPlayer mediaPlayer){
            soundsCounter++;
            if (soundsCounter < 3){ // PLay sound 3 times
                playNotification();
            }

        }
    } );
}

// Plays system notification at the selected volume
private void playNotification() {
    thePlayer.setVolume(playbackVolume, playbackVolume);
    thePlayer.start();
}

// Called when the user taps the HighV button
public void playHighV(View view) {
    soundsCounter = 0;
    playbackVolume = 1f;
    playNotification();
}

// Called when the user taps the LowV button
public void playLowV(View view) {
    soundsCounter = 0;
    playbackVolume = 0.1f;
    playNotification();
}

}

Can't change volume correctly (setVolume)

1 Answers1