Java tutorial
/* * Copyright (C) 2016 Hendrik Borghorst & Frederik Luetkes * * 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 org.gateshipone.odyssey.fragments; import android.content.Context; import android.content.SharedPreferences; import android.os.RemoteException; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.content.Loader; import android.support.v4.widget.SwipeRefreshLayout; import android.view.ContextMenu; import android.view.LayoutInflater; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.AdapterView; import org.gateshipone.odyssey.R; import org.gateshipone.odyssey.adapter.ArtistsAdapter; import org.gateshipone.odyssey.artworkdatabase.ArtworkManager; import org.gateshipone.odyssey.listener.OnArtistSelectedListener; import org.gateshipone.odyssey.loaders.ArtistLoader; import org.gateshipone.odyssey.models.ArtistModel; import org.gateshipone.odyssey.utils.MusicLibraryHelper; import org.gateshipone.odyssey.utils.ScrollSpeedListener; import org.gateshipone.odyssey.utils.ThemeUtils; import java.util.List; public class ArtistsFragment extends OdysseyFragment<ArtistModel> implements AdapterView.OnItemClickListener { /** * Listener to open an artist */ private OnArtistSelectedListener mArtistSelectedCallback; /** * Save the root List/GridView for later usage. */ protected AbsListView mListView; /** * Save the last scroll position to resume there */ private int mLastPosition = -1; /** * Called to create instantiate the UI of the fragment. */ @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment View rootView; SharedPreferences sharedPref = android.support.v7.preference.PreferenceManager .getDefaultSharedPreferences(getContext()); String viewAppearance = sharedPref.getString(getString(R.string.pref_view_library_key), getString(R.string.pref_library_view_default)); boolean useList = viewAppearance.equals(getString(R.string.pref_library_view_list_key)); if (useList) { rootView = inflater.inflate(R.layout.list_refresh, container, false); // get listview mListView = (AbsListView) rootView.findViewById(R.id.list_refresh_listview); } else { rootView = inflater.inflate(R.layout.grid_refresh, container, false); // get gridview mListView = (AbsListView) rootView.findViewById(R.id.grid_refresh_gridview); } // get swipe layout mSwipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.refresh_layout); // set swipe colors mSwipeRefreshLayout.setColorSchemeColors(ThemeUtils.getThemeColor(getContext(), R.attr.colorAccent), ThemeUtils.getThemeColor(getContext(), R.attr.colorPrimary)); // set swipe refresh listener mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { refreshContent(); } }); mAdapter = new ArtistsAdapter(getActivity(), mListView, useList); mListView.setAdapter(mAdapter); mListView.setOnScrollListener(new ScrollSpeedListener(mAdapter, mListView)); mListView.setOnItemClickListener(this); // register for context menu registerForContextMenu(mListView); return rootView; } @Override public void onResume() { super.onResume(); ArtworkManager.getInstance(getContext().getApplicationContext()) .registerOnNewArtistImageListener((ArtistsAdapter) mAdapter); } @Override public void onPause() { super.onPause(); ArtworkManager.getInstance(getContext().getApplicationContext()) .unregisterOnNewArtistImageListener((ArtistsAdapter) mAdapter); } /** * Called when the fragment is first attached to its context. */ @Override public void onAttach(Context context) { super.onAttach(context); // This makes sure that the container activity has implemented // the callback interface. If not, it throws an exception try { mArtistSelectedCallback = (OnArtistSelectedListener) context; } catch (ClassCastException e) { throw new ClassCastException(context.toString() + " must implement OnArtistSelectedListener"); } } /** * This method creates a new loader for this fragment. * * @param id The id of the loader * @param bundle Optional arguments * @return Return a new Loader instance that is ready to start loading. */ @Override public Loader<List<ArtistModel>> onCreateLoader(int id, Bundle bundle) { return new ArtistLoader(getActivity()); } /** * Called when the loader finished loading its data. * * @param loader The used loader itself * @param model Data of the loader */ @Override public void onLoadFinished(Loader<List<ArtistModel>> loader, List<ArtistModel> model) { super.onLoadFinished(loader, model); // Reset old scroll position if (mLastPosition >= 0) { mListView.setSelection(mLastPosition); mLastPosition = -1; } } /** * Callback when an item in the ListView was clicked. */ @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // Save scroll position mLastPosition = position; // identify current artist ArtistModel currentArtist = (ArtistModel) mAdapter.getItem(position); String artist = currentArtist.getArtistName(); long artistID = currentArtist.getArtistID(); if (artistID == -1) { // Try to get the artistID manually because it seems to be missing artistID = MusicLibraryHelper.getArtistIDFromName(artist, getActivity()); } // send the event to the host activity mArtistSelectedCallback.onArtistSelected(artist, artistID); } /** * Create the context menu. */ @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); MenuInflater inflater = getActivity().getMenuInflater(); inflater.inflate(R.menu.context_menu_artists_fragment, menu); } /** * Hook called when an menu item in the context menu is selected. * * @param item The menu item that was selected. * @return True if the hook was consumed here. */ @Override public boolean onContextItemSelected(MenuItem item) { AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo(); if (info == null) { return super.onContextItemSelected(item); } switch (item.getItemId()) { case R.id.fragment_artist_action_enqueue: enqueueArtist(info.position); return true; case R.id.fragment_artist_action_play: playArtist(info.position); return true; default: return super.onContextItemSelected(item); } } /** * Call the PBS to enqueue the selected artist * * @param position the position of the selected artist in the adapter */ private void enqueueArtist(int position) { // identify current artist ArtistModel currentArtist = (ArtistModel) mAdapter.getItem(position); String artist = currentArtist.getArtistName(); long artistID = currentArtist.getArtistID(); if (artistID == -1) { // Try to get the artistID manually because it seems to be missing artistID = MusicLibraryHelper.getArtistIDFromName(artist, getActivity()); } // Read order preference SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(getContext()); String orderKey = sharedPref.getString(getString(R.string.pref_album_sort_order_key), getString(R.string.pref_artist_albums_sort_default)); // enqueue artist try { mServiceConnection.getPBS().enqueueArtist(artistID, orderKey); } catch (RemoteException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * Call the PBS to play the selected artist. * A previous playlist will be cleared. * * @param position the position of the selected artist in the adapter */ private void playArtist(int position) { // Remove old tracks try { mServiceConnection.getPBS().clearPlaylist(); } catch (RemoteException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } // get and enqueue all albums of the current artist enqueueArtist(position); // play album try { mServiceConnection.getPBS().jumpTo(0); } catch (RemoteException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }