package com.icaynia.pracler.models;

/**
 * Created by icaynia on 29/03/2017.
 */

public class Song
{
    public long uid;
    public long artistUid;
    public long albumUid;
    public String title;
    public String artist;
    public String album;
    public String length;
}

package com.icaynia.pracler.models;

/**
 * Created by icaynia on 29/03/2017.
 */

public class Song
{
    public long uid;
    public int artistUid;
    public int albumUid;
    public String title;
    public String artist;
    public String album;

    public int length;
}

Fix null error