MediaItemViewHolder.java

package com.markzhai.lyrichere.ui;

import android.app.Activity;
import android.content.Context;
import android.content.res.ColorStateList;
import android.graphics.Bitmap;
import android.graphics.drawable.AnimationDrawable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.media.MediaDescriptionCompat;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.markzhai.lyrichere.AlbumArtCache;
import com.markzhai.lyrichere.R;
import com.markzhai.lyrichere.utils.LogUtils;
import com.markzhai.lyrichere.utils.LollipopUtils;

public class MediaItemViewHolder {

    static final int STATE_INVALID = -1;
    static final int STATE_NONE = 0;
    static final int STATE_PLAYABLE = 1;
    static final int STATE_PAUSED = 2;
    static final int STATE_PLAYING = 3;

    private static ColorStateList sColorStatePlaying;
    private static ColorStateList sColorStateNotPlaying;

    ImageView mImageView;
    TextView mTitleView;
    TextView mDescriptionView;

    static View setupView(Activity activity, View convertView, ViewGroup parent,
                          MediaDescriptionCompat description, int state) {

        if (sColorStateNotPlaying == null || sColorStatePlaying == null) {
            initializeColorStateLists(activity);
        }

        final MediaItemViewHolder holder;

        Integer cachedState = STATE_INVALID;

        if (convertView == null) {
            convertView = LayoutInflater.from(activity)
                    .inflate(R.layout.media_list_item, parent, false);
            holder = new MediaItemViewHolder();
            holder.mImageView = (ImageView) convertView.findViewById(R.id.play_eq);
            holder.mTitleView = (TextView) convertView.findViewById(R.id.title);
            holder.mDescriptionView = (TextView) convertView.findViewById(R.id.description);
            convertView.setTag(holder);
        } else {
            holder = (MediaItemViewHolder) convertView.getTag();
            cachedState = (Integer) convertView.getTag(R.id.tag_mediaitem_state_cache);
        }

        holder.mTitleView.setText(description.getTitle());
        holder.mDescriptionView.setText(description.getSubtitle());

        // If the state of convertView is different, we need to adapt the view to the
        // new state.
        if (cachedState == null || cachedState != state) {
            switch (state) {
                case STATE_PLAYABLE:
                    holder.mImageView.setImageDrawable(
                            ActivityCompat.getDrawable(activity, R.drawable.ic_play_arrow_black_36dp));
                    LollipopUtils.setImageTintList(holder.mImageView, sColorStateNotPlaying);
                    holder.mImageView.setVisibility(View.VISIBLE);
                    break;
                case STATE_PLAYING:
                    AnimationDrawable animation = (AnimationDrawable)
                            ActivityCompat.getDrawable(activity, R.drawable.ic_equalizer_white_36dp);
                    holder.mImageView.setImageDrawable(animation);
                    LollipopUtils.setImageTintList(holder.mImageView, sColorStatePlaying);
                    holder.mImageView.setVisibility(View.VISIBLE);
                    animation.start();
                    break;
                case STATE_PAUSED:
                    holder.mImageView.setImageDrawable(
                            ActivityCompat.getDrawable(activity, R.drawable.ic_equalizer1_white_36dp));
                    LollipopUtils.setImageTintList(holder.mImageView, sColorStateNotPlaying);
                    holder.mImageView.setVisibility(View.VISIBLE);
                    break;
                default:
                    if (description.getIconUri() != null) {
                        String artUrl = description.getIconUri().toString();
                        Bitmap art = description.getIconBitmap();
                        AlbumArtCache cache = AlbumArtCache.getInstance();
                        if (art == null) {
                            art = cache.getIconImage(artUrl);
                        }
                        if (art != null) {
                            holder.mImageView.setImageBitmap(art);
                        } else {
                            cache.fetch(artUrl, new AlbumArtCache.FetchListener() {
                                        @Override
                                        public void onFetched(String artUrl, Bitmap bitmap, Bitmap icon) {
                                            if (icon != null) {
                                                holder.mImageView.setImageBitmap(icon);
                                            }
                                        }
                                    }
                            );
                        }
                    } else {
                        holder.mImageView.setVisibility(View.GONE);
                    }
            }
            convertView.setTag(R.id.tag_mediaitem_state_cache, state);
        }

        return convertView;
    }

    static private void initializeColorStateLists(Context ctx) {
        sColorStateNotPlaying = ColorStateList.valueOf(ctx.getResources().getColor(
                R.color.media_item_icon_not_playing));
        sColorStatePlaying = ColorStateList.valueOf(ctx.getResources().getColor(
                R.color.media_item_icon_playing));
    }
}