/data/dataの音楽ファイルを再生する

hoge.java

String fileName = "hoge.mp3";

FileInputStream fis = null;
try {
    fis = new FileInputStream(this.getFileStreamPath(fileName));
} catch (FileNotFoundException e) {
}

try {
    mediaPlayer.setDataSource(fis.getFD());
    mediaPlayer.prepare();
} catch (IllegalArgumentException e) {
} catch (IllegalStateException e) {
} catch (IOException e) {
}
mediaPlayer.start();