Java tutorial
/* Copyright (C) 2013 Johannes Schnatterer * * See the NOTICE file distributed with this work for additional * information regarding copyright ownership. * * This file is part of nusic. * * nusic 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. * nusic 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 nusic. If not, see <http://www.gnu.org/licenses/>. */ package info.schnatterer.nusic.android.fragments; import info.schnatterer.nusic.Constants; import info.schnatterer.nusic.Constants.Loaders; import info.schnatterer.nusic.R; import info.schnatterer.nusic.android.application.NusicApplication; import info.schnatterer.nusic.core.ArtistService; import info.schnatterer.nusic.core.ReleaseService; import info.schnatterer.nusic.core.ServiceException; import info.schnatterer.nusic.core.SyncReleasesService; import info.schnatterer.nusic.data.model.Artist; import info.schnatterer.nusic.data.model.Release; import info.schnatterer.nusic.core.impl.ArtistServiceImpl; import info.schnatterer.nusic.core.impl.SyncReleasesServiceImpl; import info.schnatterer.nusic.core.impl.ReleaseServiceImpl; import info.schnatterer.nusic.android.activities.NusicWebView; import info.schnatterer.nusic.android.adapters.ReleaseListAdapter; import info.schnatterer.nusic.android.loaders.AsyncResult; import info.schnatterer.nusic.android.loaders.ReleaseLoaderAll; import info.schnatterer.nusic.android.loaders.ReleaseLoaderAvailable; import info.schnatterer.nusic.android.loaders.ReleaseLoaderJustCreated; import java.util.List; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.LoaderManager; import android.support.v4.content.Loader; import android.util.Log; import android.view.ContextMenu; import android.view.ContextMenu.ContextMenuInfo; import android.view.LayoutInflater; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.AdapterView.AdapterContextMenuInfo; import android.widget.AdapterView.OnItemClickListener; import android.widget.ListView; import android.widget.ProgressBar; import android.widget.TextView; import com.actionbarsherlock.app.SherlockFragment; import com.nostra13.universalimageloader.core.listener.PauseOnScrollListener; /** * Fragment that loads a list of releases from the local database and displays * it. * * Which releases are queried and which loader is used can be decided in the * intent that create the fragment using the following extra. * * <ul> * <li>{@value #EXTRA_LOADER_ID} the ID of the underlying loader</li> * </ul> * * @author schnatterer * */ public class ReleaseListFragment extends SherlockFragment { /** * Key to the creating intent's extras that contains the {@link Loaders}<br/> * See {@link #loaderId}. */ public static final String EXTRA_LOADER_ID = "nusic.intent.releaseList.loaderId"; /** The loader that is connected to the data displayed in the fragment. */ private int loaderId = -1; private ListView releasesListView; private ReleaseListAdapter releasesListViewAdapter = null; private TextView releasesTextViewNoneFound; /** Progress animation when loading releases from db */ private ProgressBar progressBar; private SyncReleasesService syncReleasesService; private ReleaseService releaseService; private ArtistService artistService; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { try { loaderId = getArguments().getInt(EXTRA_LOADER_ID); } catch (Exception e) { Log.w(Constants.LOG, "Error reading arguments from bundle passed by parent activity", e); } View view = inflater.inflate(R.layout.release_list_layout, container, false); progressBar = (ProgressBar) view.findViewById(R.id.releasesProgressBar); progressBar.setVisibility(View.GONE); releasesTextViewNoneFound = (TextView) view.findViewById(R.id.releasesTextViewNoneFound); releasesTextViewNoneFound.setVisibility(View.GONE); releasesListView = (ListView) view.findViewById(R.id.releasesListView); registerForContextMenu(releasesListView); releasesListView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> a, View v, int position, long id) { Release release = (Release) releasesListView.getItemAtPosition(position); Intent launchBrowser = new Intent("", Uri.parse(release.getMusicBrainzUri()), getActivity(), NusicWebView.class); startActivity(launchBrowser); } }); releasesListViewAdapter = new ReleaseListAdapter(getActivity()); releasesListView.setAdapter(releasesListViewAdapter); releasesListView.setOnScrollListener( new PauseOnScrollListener(releasesListViewAdapter.getImageLoader(), false, true)); displayLoading(); // Load releases from local db getActivity().getSupportLoaderManager().initLoader(loaderId, null, new ReleaseLoaderCallbacks()); return view; } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); // if (v.getId() == R.id.releasesListView) { MenuInflater inflater = getSherlockActivity().getMenuInflater(); AdapterView.AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo; Release release = (Release) releasesListView.getItemAtPosition(info.position); menu.setHeaderTitle(release.getArtistName() + " - " + release.getReleaseName()); inflater.inflate(R.menu.release_list_menu, menu); } @Override public boolean onContextItemSelected(MenuItem item) { // If this callback was invoked on the visible fragment instance if (getUserVisibleHint()) { AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo(); Release release = (Release) releasesListView.getItemAtPosition(info.position); try { switch (item.getItemId()) { case R.id.releaseListMenuHideRelease: displayLoading(); release.setHidden(true); getReleaseService().update(release); getActivity().onContentChanged(); break; case R.id.releaseListMenuHideAllByArtist: Artist artist = release.getArtist(); artist.setHidden(true); getArtistService().update(artist); getActivity().onContentChanged(); break; default: return super.onContextItemSelected(item); } } catch (ServiceException e) { Log.w(Constants.LOG, "Error hiding release/artist", e); NusicApplication.toast(e.getLocalizedMessageId()); } return true; // Finish processing fragment instances } else { return false; // Pass the event to the next fragment } } protected void setReleases(List<Release> result) { releasesListViewAdapter.show(result); } protected SyncReleasesService getReleaseRefreshService() { if (syncReleasesService == null) { syncReleasesService = new SyncReleasesServiceImpl(getSherlockActivity()); } return syncReleasesService; } protected ReleaseService getReleaseService() { if (releaseService == null) { releaseService = new ReleaseServiceImpl(getSherlockActivity()); } return releaseService; } protected ArtistService getArtistService() { if (artistService == null) { artistService = new ArtistServiceImpl(getSherlockActivity()); } return artistService; } /** * Shows the loading animation. */ private void displayLoading() { getActivity().runOnUiThread(new Runnable() { @Override public void run() { progressBar.setVisibility(View.VISIBLE); releasesTextViewNoneFound.setVisibility(View.GONE); } }); } /** * Handles callbacks from the loader manager for {@link ReleaseListFragment} * . * * @author schnatterer * */ private class ReleaseLoaderCallbacks implements LoaderManager.LoaderCallbacks<AsyncResult<List<Release>>> { private int loaderId; @Override public Loader<AsyncResult<List<Release>>> onCreateLoader(int id, Bundle args) { loaderId = id; switch (loaderId) { case Loaders.RELEASE_LOADER_ALL: return new ReleaseLoaderAll(getActivity()); case Loaders.RELEASE_LOADER_JUST_ADDED: return new ReleaseLoaderJustCreated(getActivity()); case Loaders.RELEASE_LOADER_ANNOUNCED: return new ReleaseLoaderAvailable(getActivity(), false); case Loaders.RELEASE_LOADER_AVAILABLE: return new ReleaseLoaderAvailable(getActivity(), true); default: Log.w(Constants.LOG, "Requested loader ID is not a defined release loader: " + loaderId + ". Returning loader that loads all releases"); return new ReleaseLoaderAll(getActivity()); } } @Override public void onLoadFinished(Loader<AsyncResult<List<Release>>> loader, AsyncResult<List<Release>> result) { progressBar.setVisibility(View.GONE); if (result.getException() != null) { releasesTextViewNoneFound.setVisibility(View.VISIBLE); releasesTextViewNoneFound.setText(R.string.MainActivity_errorLoadingReleases); return; } if (result.getData() == null || (result.getData() != null && result.getData().isEmpty())) { // Set the empty text releasesTextViewNoneFound.setVisibility(View.VISIBLE); if (loaderId == Loaders.RELEASE_LOADER_JUST_ADDED) { releasesTextViewNoneFound.setText(R.string.MainActivity_noNewReleasesFound); } else { releasesTextViewNoneFound.setText(R.string.MainActivity_noReleasesFound); } return; } releasesTextViewNoneFound.setVisibility(View.GONE); setReleases(result.getData()); } @Override public void onLoaderReset(Loader<AsyncResult<List<Release>>> result) { setReleases(null); } } }