Develop Reference

How to check if external media player is playing in android?

I want to stop my media player if external media player is playing.
I've implemented following code but it is called even when my app media player is playing.
if (audioManager.isMusicActive()) {
return;
}
How to distinguish between in-app media player and external media player?
Any help would be appreciated.

Two or more Android apps can play audio to the same output stream
simultaneously. The system mixes everything together. While this is
technically impressive, it can be very aggravating to a user. To avoid
every music app playing at the same time, Android introduces the idea
of audio focus. Only one app can hold audio focus at a time.
Further,
A well-behaved audio app should manage audio focus according to these
general guidelines:
Call requestAudioFocus() immediately before starting to play and
verify that the call returns AUDIOFOCUS_REQUEST_GRANTED. If you design
your app as we describe in this guide, the call to requestAudioFocus()
should be made in the onPlay() callback of your media session. When
another app gains audio focus, stop or pause playing, or duck the
volume down. When playback stops, abandon audio focus. Audio focus is
handled differently depending on the the version of Android that is
running:
You can check the more detail from developer link.

Abandoning audio focus does not resume music streaming for other apps

I'm working on an app allowing users to watch videos. When they open a video to watch, I call:
AudioManager mAudioManager = (AudioManager)getContext().getSystemService(Context.AUDIO_SERVICE);
mAudioManager.requestAudioFocus(this, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);
This stops playback from any other apps streaming music at the time. I've tested with Play Music, Spotify, Soundcloud, etc and they all stop music playback at this point.
When the user is done watching a video, I call
mAudioManager.abandonAudioFocus(this);
but the app that was streaming music and previously paused does not resume streaming music. How can I get this to work?
I've tried doing AUDIOFOCUS_GAIN and AUDIOFOCUS_GAIN_TRANSIENT. Everything I've read on Stack Overflow just says I just need to release the audio manager. This seems so simple, but I can't figure it out. I want the functionality to be similar to how Instagram pauses and resumes music when you view a video.

As you are requesting the complete 'AUDIO_FOCUS', the external application has to hit the play button to request the 'AUDIO_FOCUS' back. Just because your application has gained the 'AUDIO_FOCUS' and then abandoned it, this wouldn't resume the previous music/video which was being played.
The only way to overcome this would be to rethink the requirement of the application. Therefore, you can request temporary audio focus, i.e. AudioManager.AUDIOFOCUS_GAIN_TRANSIENT (or AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_CAN_DUCK depending on whether or not you think it's ok for other audio to keep playing in the background at a lower volume).
int requestAudioFocusResult = audioManager.requestAudioFocus(TimeWhisperService.this, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK);
if(requestAudioFocusResult == AudioManager.AUDIOFOCUS_GAIN) {
//ACCESS GRANTED
}

Mixing audio with music player and AudioManager.requestAudioFocus

Is it possible to mix my app's audio with the music player audio?
I find that by default, android does mix the audio of the music player with my app.
However this stops working after calling AudioManager.requestAudioFocus method. Meaning, if the music player is playing, when my app starts playing, it stops the music player. I want them to play at the same time.
I request the audio focus so I can know when other interruptions such as phone calls have happened. I do want to stop my app's audio when a phone call happens.
My audio plays sin waves, it is a medical device. I request the audio focus with AudioManager.STREAM_MUSIC and AudioManager.AUDIOFOCUS_GAIN.
I am using AudioTrack to play them.

how to stop the native android service playing music

I am developing a media app.
If a user plays a song with the native android application for playing a song and then opens my application then i want to stop playing that song in background before user opens my application. At present both songs are being played at a time.

You do not "stop playing that song in background before user opens my application". You request the audio focus using AudioManager.

You can have your program run the isPlaying() routine check if something is playing and take action against the media player if needed.

Android media player(android.media.MediaPlayer) two music concurrently

Before open my application I played some of the music from default music player. With that background music I opened my application with the mediaplayer (android.media.MediaPlayer) to play the mp3 available in assets.
The default doesn't stop the music and I am getting two music concurrently from the device.
How do I stop or pause music of the default music player whenever my app started playing the music?

I think thats impossible. The default music player is a different app and out of your control. android does not allow controlling other app features from your app.

I had the same problem. I was trying to stop the background music of the default music player (if it is playing) when my VoIP SIP application receives an incoming call. I came up with:
AudioManager am = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
am.setStreamMute(AudioManager.STREAM_MUSIC, true);
This does not stop or pause the music, but it make the music stream silent. Do not forget to unmute it later. This solution works well only if your second sound does not use the same stream.