ITCanopy

It’s simple to extract music from videos. You don’t have to download any additional software to do it if your computer already has VLC Media Player installed. The convert feature that comes with the free player allows you to remove the video part and just keep the audio or the music. That means you can remove all those moving images and just save it as an MP3 or any other audio format like WAV, FLAC or OGG. This is a great feature if you want to just keep the music from the music videos. You’d be reducing the file size drastically. Click on Media > Convert/Save [CTRL + R]. Click on Add. Browse and open your video file. Click on Convert/Save. Under Settings, in Profile choose Audio – MP3. Hit Browse and give a destination file name with the extension ending in .mp3. Click Start. Source: VLCHelp

While working with mp3 file in your res\raw when Run the app (Shift+F10) android studio will ask for New File Type Association. There are two ways to handle this: First: Check the option "Open matching files in associated application" and click OK. Second: You can add manually and also remove the file association (If you have previously incorrectly associated "*.mp3" with something else, then Android Studio warns you and allows you to delete the old association). Select File -> Settings (Ctrl+Alt+S) -> File Types -> Files Opened In Associated Applications Click on the + sign Add "*.mp3" Click OK. Note: Resource names must contain lowercase a-z, 0-9 or underscores.