RandomSong.java

package com.nf2m;


import android.content.Context;
import android.support.annotation.NonNull;

import com.nf2m.preferences.Preferences;
import com.nf2m.service.MediaPlayerService;

import java.util.ArrayList;
import java.util.HashMap;

public class RandomSong {

    @NonNull
    public static ArrayList<Integer> randomPosList = new ArrayList<>();
    @NonNull
    public static final HashMap<Integer, Integer> randomPosMap = new HashMap<>();
    private static Preferences preferences;

    @NonNull
    public static RandomSong newInstance(@NonNull Context context) {
        preferences = Preferences.newInstance(context);
        return new RandomSong();
    }

    public int getRandomPos() {
        int songPos = preferences.getPrefSongPosition();

        randomPosList.add(songPos);
        int pos;
        java.util.Random random = new java.util.Random();
        do {
            if (MediaPlayerService.songsCursor.getCount() == 1) {
                pos = 0;
                break;
            }
            pos = random.nextInt(MediaPlayerService.songsCursor.getCount());
        } while (pos == songPos);

        if (pos >= MediaPlayerService.songsCursor.getCount() || pos < 0) {
            pos = 0;
        }

        return pos;
    }


}