Question

I’m in a mobile programming class right now and we have to make a simple media player. Right now I’m trying to make it so that when a user opens an mp3 my app comes up as a possible default? How do I code this?

Answer 1

How to make an app a default for a certain task?

You can’t “make an app a default”. The user makes it their default.

Right now I’m trying to make it so that when a user opens an mp3 my app comes up as a possible default? How do I code this?

Try the following <intent-filter> on your activity that sets up the media playback:

        <intent-filter>
            <action android:name="android.intent.action.VIEW" />
            <category android:name="android.intent.category.DEFAULT" />
            <data android:mimeType="audio/mpeg"/>
        </intent-filter>

Then, if some app fires off an ACTION_VIEW Intent on an MP3 file, your activity should appear along with other activities from other apps in a chooser dialog.