Develop Reference

Increase media player volume only when music is playing

I have audios which only play when certain conditions are met. I want to increase the audio volume only when it plays, and once it finishes the volume should be set to default system volume. Currently I am setting volume to max, which works ok when audio is playing but keeps the system volume to that level even after audios are finished. Which makes a very bad situation for user when say a call comes it makes the device very noisy.
I am confused to achieve this. I have also read that using audioManager to set volume is not a good practice and it has side effects.
Here is something which I was trying to control the volume:
public void resume() {
AudioManager audioManager = (AudioManager) MobieFitSdkApplication.singleton().getSystemService(Context.AUDIO_SERVICE);
if (player != null) {
player.setAudioStreamType(AudioManager.STREAM_MUSIC);
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC), 0);
player.setVolume(audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC), audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC));
}
}
So how can I only increase volume when audios are playing?

-Do one thing first of all get the current volume of System:
AudioManager am = (AudioManager) getSystemService(AUDIO_SERVICE);
int volume_level= am.getStreamVolume(AudioManager.STREAM_MUSIC);
after your audio complete or when you release media player at that time set the default volume which you get before the audio play.
am.setStreamVolume(AudioManager.STREAM_MUSIC,volume_level,0);

I have achieved what I have asked in my question by taking some help from the above answers.
First I am getting the original system volume and once the audio starts I am setting the system volume to 70%.
int originalVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
int maxDeviceVolume = mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
float percent = 0.7f;
int seventyVolume = (int) (maxDeviceVolume*percent);
mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, seventyVolume, 0);
Once the audio ends I am resetting the device volume to the original.
mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, originalVolume, 0);

How can I use the androids' music stream as the data source of the media player library

In my app, I am trying to alter the volume of both(left/right headphone music streams) coming out of the device with a Seekbar.
The AudioManager Class can access the music stream coming from the device:
AudioManager am = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
int maxValue = am.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
int curValue = am.getStreamVolume(AudioManager.STREAM_MUSIC);
But the AudioManager .setStreamVolume() class can only change the volume coming from both ears together.
I figured out how to set the volume separately with the MediaPlayer class but how do I link the MediaPlayer class's .setDataSource() method to the stream coming out of the android device?
I looked everywhere and still haven't found an answer. Any help is appreciated!

You use setAudioStreamType() after you setDataSource(), but before calling
prepare

How do I get the system volume programatically

I want to get the system volume level to use programatically, the one you set with the hardware keys when being outside any application.
I tried with below method but it doesnt do anything
MediaPlayer mediaPlayer = MediaPlayer.create(context, R.raw.notif);
AudioManager am = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
int volume_level = am.getStreamVolume(AudioManager.STREAM_SYSTEM);
mediaPlayer.setAudioStreamType(volume_level);
mediaPlayer.start();
What do I need to change?

You have to change this line
mediaPlayer.setAudioStreamType(volume_level);
to this:
mediaPlayer.setAudioStreamType(AudioManager.STREAM_SYSTEM);
setAudioStreamType()
Used to identify the type of audio stream
AudioManager.STREAM_ALARM is for alarm
AudioManager.STREAM_DTMF is for touch sounds
AudioManager.STREAM_MUSIC is for music
AudioManager.STREAM_NOTIFICATION is for notification
AudioManager.STREAM_RING is for phone ring
AudioManager.STREAM_SYSTEM is for system sounds
AudioManager.STREAM_VOICE_CALL is for phone calls

Please reffer offical doc here to set or get the system volume of android device.
To set volume level to 20 you can use following code:
AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);

MediaPlayer.setVolume() function doesn't seem to work

I need to set media volume to MAX in my app to play a buzzer.
I am trying to do it by using media.setVolume() function but it doesn't seem to work.
I have already tried
mediaPlayer.setVolume(1.0f, 1.0f);
I have also tried
int MAX_VOLUME = 1000;
final float volume = (float) (1 - (Math.log(MAX_VOLUME - 999) / Math.log(MAX_VOLUME)));
mediaPlayer.setVolume(volume, volume);
None of the above worked for me.
Somebody pls help me on how to set media volume to full using MediaPlayer.setVolume(float, float) function.

MediaPlayer.setVolume(float, float) sets the volume of the given MediaPlayer instance. This volume is 1.0f (max) by default. It doesn't change the global media volume which is what I wanted to accomplish originally.
I found a solution that simply sets the global media volume.
Useful Remark: I found many answers on stackoverflow.com for setting max volume level or changing volume, most of them used alarm stream (STREAM_ALARM) to do so. I think using alarm stream would not be a good option if you are playing audio casually.
The global volume of a stream type (music in this case) can be changed using the following code.
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
am.setStreamVolume(AudioManager.STREAM_MUSIC, am.getStreamMaxVolume(AudioManager.STREAM_MUSIC), 0);
Now, play your media object as a Music Stream :
mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
Make sure that you request MODIFY_AUDIO_SETTINGS permission in your application's manifest.
<uses-permission
android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
Note: This only sets Media (Music) Volume to the max. To set other Volumes like Ringer, use STREAM_RING.
Thanks, #MrTristan for your advice, it was really helpful.

make sure you've got MODIFY_AUDIO_SETTINGS set as a permission you request in your app if that's the type of volume you're looking to set.

Note that the passed volume values are raw scalars in range 0.0 to 1.0
http://developer.android.com/reference/android/media/MediaPlayer.html#setVolume(float, float)
Why don't you try just using mp.setVolume(1.0, 1.0).

setVolume() doesn't work properly, so you should set stream volume by AudioManager.
This one has a bad effect too and it is that you change the entire stream volume of the user device!
And user doesn't like this, so you should change it back to the default value.
But how?!
Define your AudioManager:
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
Store current volume and set stream value to its Maximum value:
int currentVolume = Objects.requireNonNull(am).getStreamVolume(AudioManager.STREAM_NOTIFICATION);
am.setStreamVolume(AudioManager.STREAM_NOTIFICATION, am.getStreamMaxVolume(AudioManager.STREAM_NOTIFICATION), 0);
Define AudioAttributes.Builder and set the stream type for it:
AudioAttributes.Builder audioAttributes = new AudioAttributes.Builder();
audioAttributes.setLegacyStreamType(AudioManager.STREAM_NOTIFICATION);
Set audio attributes for your MediaPlayer before calling prepare() or prepareAsync():
mediaPlayer.setAudioAttributes(audioAttributes.build());
Finally set a on completion listener for mediaPlayer and change the volume to its default:
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
#Override
public void onCompletion(MediaPlayer mp) {
mp.release();
am.setStreamVolume(AudioManager.STREAM_NOTIFICATION, currentVolume, 0);
}
});
Finish! You could handle the problem. :)

volume control with in application in android?

I am preparing an app.My app have one options button with sound on and sound off.For that i used following code,
AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
int maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
int curVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
Unfortunately, the volume setting for that application would still reflect on the system volume setting for the stream type the application is using. What I would like to know is how to set the volume for that application only without affect the system setting.
Is it possible in android have full control over the volume of the app? Is there any method that could do that? Must I do this with code? please help me

You could use AudioTrack, a lower level sound API. It has an setStereoVolume() which operates independent of the system volume.