AlbumImagePagerAdapter.java

package com.nf2m.adapter;


import android.content.Context;
import android.database.Cursor;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;

import com.nf2m.RandomSong;
import com.nf2m.fragment.ImageDetailFragment;
import com.nf2m.fragment.NowPlayingFragment;


public class AlbumImagePagerAdapter extends FragmentStatePagerAdapter {

    private final int mSize;
    @NonNull
    private final RandomSong randomSong;
    @NonNull
    private final Cursor songsCursor;
    @NonNull
    private final Context context;

    public AlbumImagePagerAdapter(FragmentManager fm, @NonNull Cursor songsCursor, @NonNull Context context) {
        super(fm);
        this.songsCursor = songsCursor;
        mSize = songsCursor.getCount();
        randomSong = RandomSong.newInstance(context);
        this.context = context;
    }


    @Nullable
    @Override
    public Fragment getItem(int position) {

        if (songsCursor != null && songsCursor.getCount() != 0) {

            if (NowPlayingFragment.shuffle_state.equalsIgnoreCase(NowPlayingFragment.SHUFFLE_ON)) {

                if (RandomSong.randomPosMap.get(position) == null) {
                    int randomPos = randomSong.getRandomPos();
                    RandomSong.randomPosMap.put(position, randomPos);
                    if (!NowPlayingFragment.isConstantPos) {
                        position = randomPos;
                    }

                } else {
                    if (!NowPlayingFragment.isConstantPos) {
                        position = RandomSong.randomPosMap.get(position);
                    }
                }

            }

            System.out.println(RandomSong.randomPosMap.toString());


            if (songsCursor.moveToPosition(position)) {
                String album_id = songsCursor.getString(songsCursor.getColumnIndexOrThrow(MediaStore.Audio.AudioColumns.ALBUM_ID));
                return ImageDetailFragment.newInstance(NowPlayingFragment.getAlbumPath(album_id, context));
            }

            return null;

        }
        return ImageDetailFragment.newInstance(null);
    }


    @Override
    public int getItemPosition(Object object) {
        return POSITION_NONE;
    }


    @Override
    public int getCount() {
        return mSize;
    }


}