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.fragments; import android.app.ActivityOptions; import android.content.Intent; import android.graphics.Bitmap; import android.os.AsyncTask; import android.os.Build; import android.os.Bundle; import android.os.Handler; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.GridView; import android.widget.ImageView; import com.fastbootmobile.encore.app.AlbumActivity; import com.fastbootmobile.encore.app.R; import com.fastbootmobile.encore.app.adapters.AlbumsAdapter; import com.fastbootmobile.encore.app.ui.MaterialTransitionDrawable; import com.fastbootmobile.encore.model.Album; import com.fastbootmobile.encore.model.Artist; import com.fastbootmobile.encore.model.Playlist; import com.fastbootmobile.encore.model.SearchResult; import com.fastbootmobile.encore.model.Song; import com.fastbootmobile.encore.providers.ILocalCallback; import com.fastbootmobile.encore.providers.IMusicProvider; import com.fastbootmobile.encore.providers.ProviderAggregator; import java.util.ArrayList; import java.util.List; /** * Fragment displaying a list of albums */ public class AlbumsFragment extends Fragment implements ILocalCallback, ProviderAggregator.OfflineModeListener { private AlbumsAdapter mAdapter; private GridView mGridView; private Handler mHandler; private boolean mAdapterSet = false; /** * Use this factory method to create a new instance of * this fragment using the provided parameters. * * @return A new instance of fragment AlbumsFragment. */ public static AlbumsFragment newInstance() { return new AlbumsFragment(); } /** * Default constructor for the fragment. You should not use this constructor but rather * use {@link #newInstance()}. */ public AlbumsFragment() { } /** * {@inheritDoc} */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mAdapter = new AlbumsAdapter(getResources()); mHandler = new Handler(); } /** * {@inheritDoc} */ @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment final View root = inflater.inflate(R.layout.fragment_albums, container, false); mGridView = (GridView) root.findViewById(R.id.gvAlbums); mGridView.setFastScrollEnabled(true); // Get the albums new GetAlbumsTask().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR); // Setup the click listener mGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { AlbumsAdapter.ViewHolder tag = (AlbumsAdapter.ViewHolder) view.getTag(); ImageView ivCover = tag.ivCover; Album item = mAdapter.getItem(position); Bitmap hero = ((MaterialTransitionDrawable) ivCover.getDrawable()).getFinalDrawable().getBitmap(); Intent intent = AlbumActivity.craftIntent(getActivity(), hero, item.getRef(), item.getProvider(), tag.itemColor); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { ActivityOptions opt = ActivityOptions.makeSceneTransitionAnimation(getActivity(), tag.ivCover, "itemImage"); getActivity().startActivity(intent, opt.toBundle()); } else { startActivity(intent); } } }); return root; } /** * {@inheritDoc} */ @Override public void onResume() { super.onResume(); ProviderAggregator.getDefault().addUpdateCallback(this); ProviderAggregator.getDefault().registerOfflineModeListener(this); } /** * {@inheritDoc} */ @Override public void onPause() { super.onPause(); ProviderAggregator.getDefault().removeUpdateCallback(this); ProviderAggregator.getDefault().unregisterOfflineModeListener(this); } /** * {@inheritDoc} */ @Override public void onSongUpdate(List<Song> s) { } /** * {@inheritDoc} */ @Override public void onAlbumUpdate(final List<Album> a) { // AddAllUnique only adds loaded entities if (mAdapter.addAllUnique(a)) { mHandler.post(new Runnable() { @Override public void run() { mAdapter.notifyDataSetChanged(); } }); } } /** * {@inheritDoc} */ @Override public void onPlaylistUpdate(List<Playlist> p) { } /** * {@inheritDoc} */ @Override public void onPlaylistRemoved(String ref) { } /** * {@inheritDoc} */ @Override public void onArtistUpdate(List<Artist> a) { } /** * {@inheritDoc} */ @Override public void onProviderConnected(IMusicProvider provider) { } /** * {@inheritDoc} */ @Override public void onSearchResult(List<SearchResult> searchResult) { } @Override public void onOfflineModeChange(boolean enabled) { mHandler.post(new Runnable() { public void run() { mAdapter.notifyDataSetChanged(); } }); } private class GetAlbumsTask extends AsyncTask<Void, Void, List<Album>> { @Override protected List<Album> doInBackground(Void... params) { List<Album> outputList = new ArrayList<>(); List<Album> cachedAlbums = ProviderAggregator.getDefault().getCache().getAllAlbums(); for (Album album : cachedAlbums) { outputList.add(ProviderAggregator.getDefault().retrieveAlbum(album.getRef(), album.getProvider())); } return outputList; } @Override protected void onPostExecute(List<Album> albums) { mAdapter.addAllUnique(albums); mAdapter.notifyDataSetChanged(); if (mAdapterSet) { mAdapter.notifyDataSetChanged(); } else { mGridView.setAdapter(mAdapter); } } } }