Java tutorial
/* * Copyright 2015 Synced Synapse. All rights reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.syncedsynapse.kore2.ui; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.content.res.Resources; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.provider.BaseColumns; import android.support.v4.app.Fragment; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.support.v4.view.MenuItemCompat; import android.support.v4.widget.SwipeRefreshLayout; import android.support.v7.widget.SearchView; import android.text.TextUtils; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.CursorAdapter; import android.widget.GridView; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import com.syncedsynapse.kore2.R; import com.syncedsynapse.kore2.host.HostInfo; import com.syncedsynapse.kore2.host.HostManager; import com.syncedsynapse.kore2.jsonrpc.ApiException; import com.syncedsynapse.kore2.jsonrpc.event.MediaSyncEvent; import com.syncedsynapse.kore2.provider.MediaContract; import com.syncedsynapse.kore2.provider.MediaDatabase; import com.syncedsynapse.kore2.service.LibrarySyncService; import com.syncedsynapse.kore2.utils.LogUtils; import com.syncedsynapse.kore2.utils.UIUtils; import butterknife.ButterKnife; import butterknife.InjectView; import de.greenrobot.event.EventBus; /** * Fragment that presents the albums list */ public class AlbumListFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor>, SwipeRefreshLayout.OnRefreshListener, SearchView.OnQueryTextListener { private static final String TAG = LogUtils.makeLogTag(AlbumListFragment.class); public interface OnAlbumSelectedListener { public void onAlbumSelected(int albumId, String albumTitle); } // Loader IDs private static final int LOADER_ALBUMS = 0; private static final String GENREID = "genreid", ARTISTID = "artistid"; // The search filter to use in the loader private String searchFilter = null; private int genreId = -1; private int artistId = -1; // Movies adapter private CursorAdapter adapter; // Activity listener private OnAlbumSelectedListener listenerActivity; private HostInfo hostInfo; private EventBus bus; @InjectView(R.id.list) GridView albumsGridView; @InjectView(R.id.swipe_refresh_layout) SwipeRefreshLayout swipeRefreshLayout; @InjectView(android.R.id.empty) TextView emptyView; /** * Create a new instance of this, initialized to show albums of genres */ public static AlbumListFragment newInstanceForGenre(final int genreId) { AlbumListFragment fragment = new AlbumListFragment(); Bundle args = new Bundle(); args.putInt(GENREID, genreId); fragment.setArguments(args); return fragment; } /** * Create a new instance of this, initialized to show albums of artists */ public static AlbumListFragment newInstanceForArtist(final int artistId) { AlbumListFragment fragment = new AlbumListFragment(); Bundle args = new Bundle(); args.putInt(ARTISTID, artistId); fragment.setArguments(args); return fragment; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { Bundle args = getArguments(); if (args != null) { genreId = getArguments().getInt(GENREID, -1); artistId = getArguments().getInt(ARTISTID, -1); } ViewGroup root = (ViewGroup) inflater.inflate(R.layout.fragment_generic_media_list, container, false); ButterKnife.inject(this, root); bus = EventBus.getDefault(); hostInfo = HostManager.getInstance(getActivity()).getHostInfo(); swipeRefreshLayout.setOnRefreshListener(this); // Pad main content view to overlap with bottom system bar // UIUtils.setPaddingForSystemBars(getActivity(), albumsGridView, false, false, true); // albumsGridView.setClipToPadding(false); return root; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); albumsGridView.setEmptyView(emptyView); albumsGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // Get the movie id from the tag ViewHolder tag = (ViewHolder) view.getTag(); // Notify the activity listenerActivity.onAlbumSelected(tag.albumId, tag.albumTitle); } }); // Configure the adapter and start the loader adapter = new AlbumsAdapter(getActivity()); albumsGridView.setAdapter(adapter); getLoaderManager().initLoader(LOADER_ALBUMS, null, this); setHasOptionsMenu(true); } @Override public void onAttach(Activity activity) { super.onAttach(activity); try { listenerActivity = (OnAlbumSelectedListener) activity; } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement OnAlbumSelectedListener"); } } @Override public void onDetach() { super.onDetach(); listenerActivity = null; } @Override public void onResume() { bus.register(this); super.onResume(); } @Override public void onPause() { bus.unregister(this); super.onPause(); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.media_search, menu); MenuItem searchItem = menu.findItem(R.id.action_search); SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem); searchView.setOnQueryTextListener(this); searchView.setQueryHint(getString(R.string.action_search_albums)); super.onCreateOptionsMenu(menu, inflater); } @Override public boolean onOptionsItemSelected(MenuItem item) { return super.onOptionsItemSelected(item); } /** * Search view callbacks */ /** {@inheritDoc} */ @Override public boolean onQueryTextChange(String newText) { searchFilter = newText; getLoaderManager().restartLoader(LOADER_ALBUMS, null, this); return true; } /** {@inheritDoc} */ @Override public boolean onQueryTextSubmit(String newText) { // All is handled in onQueryTextChange return true; } /** * Swipe refresh layout callback */ /** {@inheritDoc} */ @Override public void onRefresh() { if (hostInfo != null) { // Make sure we're showing the refresh swipeRefreshLayout.setRefreshing(true); // Start the syncing process Intent syncIntent = new Intent(this.getActivity(), LibrarySyncService.class); syncIntent.putExtra(LibrarySyncService.SYNC_ALL_MUSIC, true); getActivity().startService(syncIntent); } else { swipeRefreshLayout.setRefreshing(false); Toast.makeText(getActivity(), R.string.no_xbmc_configured, Toast.LENGTH_SHORT).show(); } } /** * Event bus post. Called when the syncing process ended * * @param event Refreshes data */ public void onEventMainThread(MediaSyncEvent event) { if (event.syncType.equals(LibrarySyncService.SYNC_ALL_MUSIC)) { swipeRefreshLayout.setRefreshing(false); if (event.status == MediaSyncEvent.STATUS_SUCCESS) { getLoaderManager().restartLoader(LOADER_ALBUMS, null, this); Toast.makeText(getActivity(), R.string.sync_successful, Toast.LENGTH_SHORT).show(); } else { String msg = (event.errorCode == ApiException.API_ERROR) ? String.format(getString(R.string.error_while_syncing), event.errorMessage) : getString(R.string.unable_to_connect_to_xbmc); Toast.makeText(getActivity(), msg, Toast.LENGTH_SHORT).show(); } } } /** * Loader callbacks */ /** {@inheritDoc} */ @Override public Loader<Cursor> onCreateLoader(int i, Bundle bundle) { Uri uri; int hostId = hostInfo != null ? hostInfo.getId() : -1; if (artistId != -1) { uri = MediaContract.AlbumArtists.buildAlbumsForArtistListUri(hostId, artistId); } else if (genreId != -1) { uri = MediaContract.AlbumGenres.buildAlbumsForGenreListUri(hostId, genreId); } else { uri = MediaContract.Albums.buildAlbumsListUri(hostId); } String selection = null; String selectionArgs[] = null; if (!TextUtils.isEmpty(searchFilter)) { selection = MediaContract.Albums.TITLE + " LIKE ?"; selectionArgs = new String[] { "%" + searchFilter + "%" }; } return new CursorLoader(getActivity(), uri, AlbumListQuery.PROJECTION, selection, selectionArgs, AlbumListQuery.SORT); } /** {@inheritDoc} */ @Override public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) { adapter.swapCursor(cursor); // To prevent the empty text from appearing on the first load, set it now emptyView.setText(getString(R.string.no_albums_found_refresh)); } /** {@inheritDoc} */ @Override public void onLoaderReset(Loader<Cursor> cursorLoader) { adapter.swapCursor(null); } /** * Album list query parameters. */ private interface AlbumListQuery { String[] PROJECTION = { BaseColumns._ID, MediaContract.Albums.ALBUMID, MediaContract.Albums.TITLE, MediaContract.Albums.DISPLAYARTIST, MediaContract.Albums.GENRE, MediaContract.Albums.THUMBNAIL, MediaContract.Albums.YEAR, }; String SORT = MediaDatabase.sortCommonTokens(MediaContract.Albums.TITLE) + " ASC"; final int ID = 0; final int ALBUMID = 1; final int TITLE = 2; final int DISPLAYARTIST = 3; final int GENRE = 4; final int THUMBNAIL = 5; final int YEAR = 6; } private static class AlbumsAdapter extends CursorAdapter { private HostManager hostManager; private int artWidth, artHeight; public AlbumsAdapter(Context context) { super(context, null, false); this.hostManager = HostManager.getInstance(context); // Get the art dimensions Resources resources = context.getResources(); artWidth = (int) (resources.getDimension(R.dimen.albumlist_art_width) / UIUtils.IMAGE_RESIZE_FACTOR); artHeight = (int) (resources.getDimension(R.dimen.albumlist_art_heigth) / UIUtils.IMAGE_RESIZE_FACTOR); } /** {@inheritDoc} */ @Override public View newView(Context context, final Cursor cursor, ViewGroup parent) { final View view = LayoutInflater.from(context).inflate(R.layout.grid_item_album, parent, false); // Setup View holder pattern ViewHolder viewHolder = new ViewHolder(); viewHolder.titleView = (TextView) view.findViewById(R.id.title); viewHolder.artistView = (TextView) view.findViewById(R.id.name); viewHolder.genresView = (TextView) view.findViewById(R.id.genres); viewHolder.artView = (ImageView) view.findViewById(R.id.art); view.setTag(viewHolder); return view; } /** {@inheritDoc} */ @Override public void bindView(View view, Context context, Cursor cursor) { final ViewHolder viewHolder = (ViewHolder) view.getTag(); viewHolder.albumId = cursor.getInt(AlbumListQuery.ALBUMID); viewHolder.albumTitle = cursor.getString(AlbumListQuery.TITLE); viewHolder.titleView.setText(viewHolder.albumTitle); viewHolder.artistView.setText(cursor.getString(AlbumListQuery.DISPLAYARTIST)); int year = cursor.getInt(AlbumListQuery.YEAR); String genres = cursor.getString(AlbumListQuery.GENRE); String desc = (genres != null) ? ((year > 0) ? genres + " | " + year : genres) : String.valueOf(year); viewHolder.genresView.setText(desc); String thumbnail = cursor.getString(AlbumListQuery.THUMBNAIL); UIUtils.loadImageWithCharacterAvatar(context, hostManager, thumbnail, viewHolder.albumTitle, viewHolder.artView, artWidth, artHeight); } } /** * View holder pattern */ private static class ViewHolder { TextView titleView; TextView artistView; TextView genresView; ImageView artView; int albumId; String albumTitle; } }