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.Activity; import android.app.ActivityOptions; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.drawable.BitmapDrawable; import android.os.Build; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.support.v4.app.Fragment; import android.support.v7.graphics.Palette; import android.util.Log; import android.util.Pair; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ExpandableListView; import android.widget.ImageView; import android.widget.ProgressBar; import com.fastbootmobile.encore.app.AlbumActivity; import com.fastbootmobile.encore.app.ArtistActivity; import com.fastbootmobile.encore.app.PlaylistActivity; import com.fastbootmobile.encore.app.R; import com.fastbootmobile.encore.app.adapters.SearchAdapter; import com.fastbootmobile.encore.app.ui.MaterialTransitionDrawable; import com.fastbootmobile.encore.framework.PlaybackProxy; 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 com.fastbootmobile.encore.utils.Utils; import java.lang.ref.WeakReference; import java.util.List; /** * Fragment displaying search results */ public class SearchFragment extends Fragment implements ILocalCallback { private static final String TAG = "SearchFragment"; private static final int MSG_UPDATE_RESULTS = 1; private static final int MSG_DATASET_CHANGED = 2; public static final String KEY_SPECIAL_MORE = "__encore_plus"; private SearchAdapter mAdapter; private Handler mHandler; private List<SearchResult> mSearchResults; private String mQuery; private ProgressBar mLoadingBar; private int mNumProvidersResponse; private static class SearchHandler extends Handler { private WeakReference<SearchFragment> mParent; public SearchHandler(WeakReference<SearchFragment> parent) { mParent = parent; } @Override public void handleMessage(Message msg) { if (msg.what == MSG_UPDATE_RESULTS) { mParent.get().updateSearchResults(); } else if (msg.what == MSG_DATASET_CHANGED) { mParent.get().mAdapter.notifyDataSetChanged(); } } } /** * Default constructor */ public SearchFragment() { mHandler = new SearchHandler(new WeakReference<>(this)); setRetainInstance(true); } public void setArguments(String query) { mQuery = query; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { final View root = inflater.inflate(R.layout.fragment_search, container, false); assert root != null; mLoadingBar = (ProgressBar) root.findViewById(R.id.pbLoading); mAdapter = new SearchAdapter(); ExpandableListView listView = (ExpandableListView) root.findViewById(R.id.expandablelv_search); listView.setAdapter(mAdapter); listView.setGroupIndicator(null); for (int i = 0; i < 4; i++) { listView.expandGroup(i, false); } listView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() { @Override public boolean onChildClick(ExpandableListView expandableListView, View view, int i, int i2, long l) { if (mSearchResults != null) { switch (i) { case SearchAdapter.ARTIST: onArtistClick(i2, view); break; case SearchAdapter.ALBUM: onAlbumClick(i2, view); break; case SearchAdapter.SONG: onSongClick(i2); break; case SearchAdapter.PLAYLIST: onPlaylistClick(i2, view); break; default: Log.e(TAG, "Unknown child group id " + i); break; } return true; } else { return false; } } }); // Restore previous search results, in case we're rotating if (mSearchResults != null) { mAdapter.appendResults(mSearchResults); mAdapter.notifyDataSetChanged(); } return root; } @Override public void onAttach(Activity activity) { super.onAttach(activity); ProviderAggregator.getDefault().addUpdateCallback(this); } @Override public void onDetach() { super.onDetach(); ProviderAggregator.getDefault().removeUpdateCallback(this); } public void resetResults() { if (mAdapter != null) { mAdapter.clear(); } } private void onSongClick(int i) { SearchAdapter.SearchEntry entry = mAdapter.getChild(SearchAdapter.SONG, i); if (entry.ref.equals(KEY_SPECIAL_MORE)) { mAdapter.setGroupMaxCount(SearchAdapter.SONG, mAdapter.getGroupMaxCount(SearchAdapter.SONG) + 5); } else { final ProviderAggregator aggregator = ProviderAggregator.getDefault(); Song song = aggregator.retrieveSong(entry.ref, entry.identifier); if (song != null) { PlaybackProxy.playSong(song); } } } private void onAlbumClick(int i, View v) { if (mAdapter.getChildrenCount(SearchAdapter.ALBUM) > 1) { SearchAdapter.SearchEntry entry = mAdapter.getChild(SearchAdapter.ALBUM, i); if (entry.ref.equals(KEY_SPECIAL_MORE)) { mAdapter.setGroupMaxCount(SearchAdapter.ALBUM, mAdapter.getGroupMaxCount(SearchAdapter.ALBUM) + 5); } else { SearchAdapter.ViewHolder holder = (SearchAdapter.ViewHolder) v.getTag(); Bitmap hero = ((MaterialTransitionDrawable) holder.albumArtImageView.getDrawable()) .getFinalDrawable().getBitmap(); int color = 0xffffff; if (hero != null) { Palette palette = Palette.generate(hero); Palette.Swatch darkVibrantColor = palette.getDarkVibrantSwatch(); Palette.Swatch darkMutedColor = palette.getDarkMutedSwatch(); if (darkVibrantColor != null) { color = darkVibrantColor.getRgb(); } else if (darkMutedColor != null) { color = darkMutedColor.getRgb(); } else { color = getResources().getColor(R.color.default_album_art_background); } } Intent intent = AlbumActivity.craftIntent(getActivity(), hero, entry.ref, entry.identifier, color); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { ImageView ivCover = holder.albumArtImageView; ActivityOptions opt = ActivityOptions.makeSceneTransitionAnimation(getActivity(), new Pair<View, String>(ivCover, "itemImage")); getActivity().startActivity(intent, opt.toBundle()); } else { startActivity(intent); } } } } private void onArtistClick(int i, View v) { if (mAdapter.getChildrenCount(SearchAdapter.ARTIST) > 1) { SearchAdapter.SearchEntry entry = mAdapter.getChild(SearchAdapter.ARTIST, i); if (entry.ref.equals(KEY_SPECIAL_MORE)) { mAdapter.setGroupMaxCount(SearchAdapter.ARTIST, mAdapter.getGroupMaxCount(SearchAdapter.ARTIST) + 5); } else { SearchAdapter.ViewHolder holder = (SearchAdapter.ViewHolder) v.getTag(); ImageView ivCover = holder.albumArtImageView; Bitmap hero = ((MaterialTransitionDrawable) ivCover.getDrawable()).getFinalDrawable().getBitmap(); int color = 0xffffff; if (hero != null) { Palette palette = Palette.generate(hero); Palette.Swatch darkVibrantColor = palette.getDarkVibrantSwatch(); Palette.Swatch darkMutedColor = palette.getDarkMutedSwatch(); if (darkVibrantColor != null) { color = darkVibrantColor.getRgb(); } else if (darkMutedColor != null) { color = darkMutedColor.getRgb(); } else { color = getResources().getColor(R.color.default_album_art_background); } } Intent intent = new Intent(getActivity(), ArtistActivity.class); intent.putExtra(ArtistActivity.EXTRA_ARTIST, entry.ref); intent.putExtra(ArtistActivity.EXTRA_BACKGROUND_COLOR, color); Utils.queueBitmap(ArtistActivity.BITMAP_ARTIST_HERO, hero); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { ActivityOptions opt = ActivityOptions.makeSceneTransitionAnimation(getActivity(), ivCover, "itemImage"); getActivity().startActivity(intent, opt.toBundle()); } else { startActivity(intent); } } } } private void onPlaylistClick(int i, View v) { if (mAdapter.getChildrenCount(SearchAdapter.PLAYLIST) > 1) { final ProviderAggregator aggregator = ProviderAggregator.getDefault(); final SearchAdapter.SearchEntry entry = mAdapter.getChild(SearchAdapter.PLAYLIST, i); if (entry.ref.equals(KEY_SPECIAL_MORE)) { mAdapter.setGroupMaxCount(SearchAdapter.PLAYLIST, mAdapter.getGroupMaxCount(SearchAdapter.PLAYLIST) + 5); } else { Playlist playlist = aggregator.retrievePlaylist(entry.ref, entry.identifier); if (playlist != null) { Intent intent = PlaylistActivity.craftIntent(getActivity(), playlist, ((BitmapDrawable) getResources().getDrawable(R.drawable.album_placeholder)) .getBitmap()); startActivity(intent); } } } } @Override public void onSongUpdate(List<Song> s) { if (mAdapter == null) { return; } for (Song song : s) { if (mAdapter.contains(song)) { mHandler.removeMessages(MSG_DATASET_CHANGED); mHandler.sendEmptyMessage(MSG_DATASET_CHANGED); return; } } } @Override public void onAlbumUpdate(List<Album> a) { if (mAdapter == null) { return; } for (Album album : a) { if (mAdapter.contains(album)) { mHandler.removeMessages(MSG_DATASET_CHANGED); mHandler.sendEmptyMessage(MSG_DATASET_CHANGED); return; } } } @Override public void onPlaylistUpdate(List<Playlist> p) { if (mAdapter == null) { return; } for (Playlist playlist : p) { if (mAdapter.contains(playlist)) { mHandler.removeMessages(MSG_DATASET_CHANGED); mHandler.sendEmptyMessage(MSG_DATASET_CHANGED); return; } } } @Override public void onPlaylistRemoved(String ref) { } @Override public void onArtistUpdate(List<Artist> a) { if (mAdapter == null) { return; } for (Artist artist : a) { if (mAdapter.contains(artist)) { mHandler.removeMessages(MSG_DATASET_CHANGED); mHandler.sendEmptyMessage(MSG_DATASET_CHANGED); return; } } } @Override public void onProviderConnected(IMusicProvider provider) { } @Override public void onSearchResult(final List<SearchResult> searchResults) { for (SearchResult searchResult : searchResults) { if (searchResult.getQuery().equals(mQuery)) { mSearchResults = searchResults; mHandler.sendEmptyMessage(MSG_UPDATE_RESULTS); mNumProvidersResponse++; break; } } } private void updateSearchResults() { final Activity act = getActivity(); if (act != null) { getActivity().setTitle("'" + mSearchResults.get(0).getQuery() + "'"); getActivity().setProgressBarIndeterminateVisibility(false); if (mNumProvidersResponse >= 2) { mLoadingBar.setVisibility(View.GONE); } } else { mHandler.sendEmptyMessage(MSG_UPDATE_RESULTS); } if (mAdapter != null) { mAdapter.appendResults(mSearchResults); mAdapter.notifyDataSetChanged(); } } }