Java tutorial
/* * Copyright (C) 2014 Fastboot Mobile, LLC. * * This program is free software; you can redistribute it and/or modify it under the terms of the * GNU General Public License as published by the Free Software Foundation; either version 3 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See * the GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along with this program; * if not, see <http://www.gnu.org/licenses>. */ package com.fastbootmobile.encore.app.adapters; import android.content.Context; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; import org.json.JSONException; import com.fastbootmobile.encore.app.R; import com.fastbootmobile.encore.app.ui.AlbumArtImageView; import com.fastbootmobile.encore.framework.PlaylistOrderer; import com.fastbootmobile.encore.model.BoundEntity; import com.fastbootmobile.encore.model.Playlist; import java.util.ArrayList; import java.util.Collection; import java.util.Collections; import java.util.List; import java.util.Map; /** * Adapter to display a list of {@link com.fastbootmobile.encore.model.Playlist} in a GridView */ public class PlaylistGridAdapter extends BaseAdapter { private static final String TAG = "PlaylistGridAdapter"; /** * ViewHolder for items */ public static class ViewHolder { public AlbumArtImageView ivCover; public TextView tvTitle; public TextView tvSubTitle; public ViewGroup vRoot; public Playlist playlist; public ImageView ivOfflineStatus; } private List<Playlist> mPlaylists; private PlaylistOrderer mOrderer; /** * Default constructor */ public PlaylistGridAdapter(Context context) { mPlaylists = new ArrayList<>(); ensureOrderer(context); } private void ensureOrderer(Context context) { if (mOrderer == null && context != null) { mOrderer = new PlaylistOrderer(context); } else if (mOrderer == null) { throw new IllegalArgumentException("Orderer context is null and orderer is null too!"); } } /** * Sorts the list alphabetically */ private void sortList(Context context) throws JSONException { ensureOrderer(context); final Map<String, Integer> order = mOrderer.getOrder(); if (order != null) { Collections.sort(mPlaylists, new PlaylistListAdapter.PlaylistSort(order)); } } /** * Adds a playlist to the adapter * @param p The playlist to add */ public void addItem(Playlist p) { mPlaylists.add(p); } /** * Adds the playlist to the adapter if it's not already there * @param p The playlist to add */ public boolean addItemUnique(Playlist p) { if (!mPlaylists.contains(p)) { mPlaylists.add(p); return true; } else { return false; } } /** * Add all the elements into the adapter if they're not already there * @param ps The collection of {@link com.fastbootmobile.encore.model.Playlist} to add */ public boolean addAllUnique(Collection<Playlist> ps) { boolean didChange = false; for (Playlist p : ps) { if (p != null && !mPlaylists.contains(p)) { mPlaylists.add(p); didChange = true; } } if (didChange) { notifyDataSetChanged(); } return didChange; } public void remove(String ref) { for (Playlist playlist : mPlaylists) { if (playlist.getRef().equals(ref)) { mPlaylists.remove(ref); break; } } } public void clear() { mPlaylists.clear(); } /** * Returns whether or not the adapter contains the provided Playlist * @param p The playlist to check * @return True if the adapter already has the playlist, false otherwise */ public boolean contains(Playlist p) { return mPlaylists.contains(p); } /** * {@inheritDoc} */ @Override public int getCount() { return mPlaylists.size(); } /** * {@inheritDoc} */ @Override public Playlist getItem(int position) { return mPlaylists.get(position); } /** * {@inheritDoc} */ @Override public long getItemId(int position) { if (position >= 0 && position < mPlaylists.size()) { return mPlaylists.get(position).getRef().hashCode(); } else { return -1; } } /** * {@inheritDoc} */ @Override public View getView(int position, View convertView, ViewGroup parent) { Context ctx = parent.getContext(); assert ctx != null; View root = convertView; if (convertView == null) { // Create a new view (nothing to recycle) LayoutInflater inflater = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE); root = inflater.inflate(R.layout.medium_card_two_lines, parent, false); assert root != null; ViewHolder holder = new ViewHolder(); holder.vRoot = (ViewGroup) root; holder.ivCover = (AlbumArtImageView) root.findViewById(R.id.ivCover); holder.tvTitle = (TextView) root.findViewById(R.id.tvTitle); holder.tvSubTitle = (TextView) root.findViewById(R.id.tvSubTitle); holder.ivOfflineStatus = (ImageView) root.findViewById(R.id.ivOfflineStatus); root.setTag(holder); } // Fill in the fields final Playlist playlist = getItem(position); final ViewHolder tag = (ViewHolder) root.getTag(); tag.playlist = playlist; if (playlist.isLoaded() || playlist.getName() != null) { tag.tvTitle.setText(playlist.getName()); tag.tvSubTitle.setText(ctx.getResources().getQuantityString(R.plurals.songs_count, playlist.getSongsCount(), playlist.getSongsCount())); tag.ivCover.loadArtForPlaylist(playlist); tag.ivOfflineStatus.setVisibility(View.VISIBLE); switch (playlist.getOfflineStatus()) { case BoundEntity.OFFLINE_STATUS_NO: tag.ivOfflineStatus.setVisibility(View.GONE); break; case BoundEntity.OFFLINE_STATUS_DOWNLOADING: tag.ivOfflineStatus.setImageResource(R.drawable.ic_sync_in_progress); break; case BoundEntity.OFFLINE_STATUS_ERROR: tag.ivOfflineStatus.setImageResource(R.drawable.ic_sync_problem); break; case BoundEntity.OFFLINE_STATUS_PENDING: tag.ivOfflineStatus.setImageResource(R.drawable.ic_track_download_pending); break; case BoundEntity.OFFLINE_STATUS_READY: tag.ivOfflineStatus.setImageResource(R.drawable.ic_track_downloaded); break; } } else { tag.tvTitle.setText(R.string.loading); tag.tvSubTitle.setText(R.string.loading); tag.ivCover.setDefaultArt(); tag.ivOfflineStatus.setVisibility(View.GONE); } return root; } /** * {@inheritDoc} */ @Override public void notifyDataSetChanged() { // We sort the list before showing it try { sortList(null); } catch (JSONException e) { Log.e(TAG, "Cannot sort items", e); } super.notifyDataSetChanged(); } }