how could I add raw mp3 files in shufflefacts

Hi I made a random page with text and image now, I want to add mp3 files in it.when I click my fab button. there is appear text, image but when I add mp3 files like my codes, it gives an error and my application stop. is there any way to add raw files in shufflefacts? here is my facts.java codes:

public class Facts {
private int ivImage;
private String mFact;
private int videoView;
public Facts(int ivImage, int videoView, String mFact) {
    this.ivImage = ivImage;
    this.videoView = videoView;
    this.mFact = mFact;
}
public int getivImage() {
    return ivImage;
}
public int getvideoView() {
    return videoView;
}
public String getmFact() {
    return mFact;
}
public String videoView() {
    return null;
}

}

and here is my random.class:

 Toolbar mToolbar;
RecyclerView mRecyclerView;
ImageView mFlower;
TextView mDescription;
VideoView videoView;
private FloatingActionButton fab;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_detail);
    mToolbar = findViewById(R.id.toolbar);
    setSupportActionBar(mToolbar);
    ActionBar actionBar= getSupportActionBar();
    actionBar.setDisplayHomeAsUpEnabled(true);
    mToolbar = findViewById(R.id.toolbar);
    videoView = findViewById(R.id.videoView);
    mToolbar.setTitle(getResources().getString(R.string.cv));
    mRecyclerView = findViewById(R.id.recyclerview);
    mFlower = findViewById(R.id.ivImage);
    mDescription = findViewById(R.id.tvDescription);
    fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setImageResource(R.drawable.vbn);
    showRandomFact();
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            showRandomFact();

        }



    });
}

private void showRandomFact() {
    shuffleFacts();
    mFlower.setImageResource(factArray[0].getivImage());
    videoView.setVideoPath(factArray[0].videoView());
    mDescription.setText(factArray[0].getmFact());
}
Facts f01 = new Facts(R.drawable.a, R.raw.b,"hjgbfvjhsdbfvskhbsdıkfvsdkb");
Facts f02 = new Facts(R.drawable.aa, R.raw.b,"hjgbfvjhsdbfvskhbsdıkfvsdkb");
Facts f03 = new Facts(R.drawable.aas, R.raw.b,"hjgbfvjhsdbfvskhbsdıkfvsdkb");
Facts[] factArray = new Facts[] {
        f01,f02,f03
};
public boolean shuffleFacts(){
    Collections.shuffle(Arrays.asList(factArray));
    return true;
}
}