Java tutorial
/* * Copyright (C) 2009 Teleca Poland Sp. z o.o. <android@teleca.com> * * 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.teleca.jamendo.activity; import java.util.ArrayList; import java.util.Hashtable; import org.json.JSONException; import com.teleca.jamendo.JamendoApplication; import com.teleca.jamendo.activity.BrowsePlaylistActivity.Mode; import com.teleca.jamendo.adapter.ImageAdapter; import com.teleca.jamendo.adapter.PurpleAdapter; import com.teleca.jamendo.adapter.PurpleEntry; import com.teleca.jamendo.adapter.PurpleListener; import com.teleca.jamendo.adapter.SeparatedListAdapter; import com.teleca.jamendo.api.Album; import com.teleca.jamendo.api.JamendoGet2Api; import com.teleca.jamendo.api.Playlist; import com.teleca.jamendo.api.PlaylistEntry; import com.teleca.jamendo.api.Track; import com.teleca.jamendo.api.WSError; import com.teleca.jamendo.api.impl.JamendoGet2ApiImpl; import com.teleca.jamendo.dialog.AboutDialog; import com.teleca.jamendo.dialog.LoadingDialog; import com.teleca.jamendo.widget.FailureBar; import com.teleca.jamendo.widget.OnAlbumClickListener; import com.teleca.jamendo.widget.ProgressBar; import com.teleca.jamendo.R; import android.app.Activity; import android.gesture.GestureOverlayView; import android.content.Context; import android.content.Intent; import android.os.AsyncTask; import android.os.Bundle; import android.os.Environment; import android.preference.PreferenceManager; import android.util.Log; import android.view.KeyEvent; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.Window; import android.view.View.OnClickListener; import android.widget.AdapterView; import android.widget.Gallery; import android.widget.ListView; import android.widget.Toast; import android.widget.ViewFlipper; import android.widget.AdapterView.OnItemClickListener; /** * Home activity of the jamendo, central navigation place * * @author Lukasz Wisniewski * @author Marcin Gil */ public class HomeActivity extends Activity implements OnAlbumClickListener { private static final String TAG = "HomeActivity"; private ViewFlipper mViewFlipper; private Gallery mGallery; private ProgressBar mProgressBar; private FailureBar mFailureBar; private ListView mHomeListView; private PurpleAdapter mBrowseJamendoPurpleAdapter; private PurpleAdapter mMyLibraryPurpleAdapter; private GestureOverlayView mGestureOverlayView; /** * Launch Home activity helper * * @param c context where launch home from (used by SplashscreenActivity) */ public static void launch(Context c) { Intent intent = new Intent(c, HomeActivity.class); intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); c.startActivity(intent); } /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.main); mHomeListView = (ListView) findViewById(R.id.HomeListView); mGallery = (Gallery) findViewById(R.id.Gallery); mProgressBar = (ProgressBar) findViewById(R.id.ProgressBar); mFailureBar = (FailureBar) findViewById(R.id.FailureBar); mViewFlipper = (ViewFlipper) findViewById(R.id.ViewFlipper); mGestureOverlayView = (GestureOverlayView) findViewById(R.id.gestures); mGestureOverlayView .addOnGesturePerformedListener(JamendoApplication.getInstance().getPlayerGestureHandler()); new NewsTask().execute((Void) null); } @Override protected void onRestoreInstanceState(Bundle savedInstanceState) { // commented out, was causing "Wrong state class -- expecting View State" on view rotation // super.onRestoreInstanceState(savedInstanceState); } @Override public void onAlbumClicked(Album album) { PlayerActivity.launch(this, album); } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.home, menu); return super.onCreateOptionsMenu(menu); } @Override public boolean onPrepareOptionsMenu(Menu menu) { if (JamendoApplication.getInstance().getPlayerEngineInterface() == null || JamendoApplication.getInstance().getPlayerEngineInterface().getPlaylist() == null) { menu.findItem(R.id.player_menu_item).setVisible(false); } else { menu.findItem(R.id.player_menu_item).setVisible(true); } return super.onPrepareOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.player_menu_item: PlayerActivity.launch(this, (Playlist) null); break; case R.id.about_menu_item: new AboutDialog(this).show(); break; case R.id.settings_menu_item: SettingsActivity.launch(this); break; default: } return super.onOptionsItemSelected(item); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { // support for search key // TODO remove hardcoded '1' value if (keyCode == KeyEvent.KEYCODE_SEARCH) { mHomeListView.setSelection(1); PurpleEntry entry = (PurpleEntry) mHomeListView.getAdapter().getItem(1); entry.getListener().performAction(); } return super.onKeyDown(keyCode, event); } @Override protected void onPause() { super.onPause(); } @Override protected void onResume() { fillHomeListView(); boolean gesturesEnabled = PreferenceManager.getDefaultSharedPreferences(this).getBoolean("gestures", true); mGestureOverlayView.setEnabled(gesturesEnabled); super.onResume(); } /** * Fills ListView with clickable menu items */ private void fillHomeListView() { mBrowseJamendoPurpleAdapter = new PurpleAdapter(this); mMyLibraryPurpleAdapter = new PurpleAdapter(this); ArrayList<PurpleEntry> browseListEntry = new ArrayList<PurpleEntry>(); ArrayList<PurpleEntry> libraryListEntry = new ArrayList<PurpleEntry>(); // BROWSE JAMENDO browseListEntry.add(new PurpleEntry(R.drawable.list_search, R.string.search, new PurpleListener() { @Override public void performAction() { SearchActivity.launch(HomeActivity.this); } })); browseListEntry.add(new PurpleEntry(R.drawable.list_radio, R.string.radio, new PurpleListener() { @Override public void performAction() { RadioActivity.launch(HomeActivity.this); } })); browseListEntry.add(new PurpleEntry(R.drawable.list_top, R.string.most_listened, new PurpleListener() { @Override public void performAction() { new Top100Task(HomeActivity.this, R.string.loading_top100, R.string.top100_fail).execute(); } })); // MY LIBRARY libraryListEntry.add(new PurpleEntry(R.drawable.list_playlist, R.string.playlists, new PurpleListener() { @Override public void performAction() { BrowsePlaylistActivity.launch(HomeActivity.this, Mode.Normal); } })); // check if we have personalized client then add starred albums final String userName = PreferenceManager.getDefaultSharedPreferences(this).getString("user_name", null); if (userName != null && userName.length() > 0) { libraryListEntry.add(new PurpleEntry(R.drawable.list_cd, R.string.albums, new PurpleListener() { @Override public void performAction() { StarredAlbumsActivity.launch(HomeActivity.this, userName); } })); } /* following needs jamendo authorization (not documented yet on the wiki) * listEntry.add(new PurpleEntry(R.drawable.list_mail, "Inbox")); */ // show this list item only if the SD Card is present if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { libraryListEntry.add(new PurpleEntry(R.drawable.list_download, R.string.download, new PurpleListener() { @Override public void performAction() { DownloadActivity.launch(HomeActivity.this); } })); } // listEntry.add(new PurpleEntry(R.drawable.list_star, R.string.favorites, new PurpleListener(){ // // @Override // public void performAction() { // Playlist playlist = new DatabaseImpl(HomeActivity.this).getFavorites(); // JamendroidApplication.getInstance().getPlayerEngine().openPlaylist(playlist); // PlaylistActivity.launch(HomeActivity.this, true); // } // // })); // attach list data to adapters mBrowseJamendoPurpleAdapter.setList(browseListEntry); mMyLibraryPurpleAdapter.setList(libraryListEntry); // separate adapters on one list SeparatedListAdapter separatedAdapter = new SeparatedListAdapter(this); separatedAdapter.addSection(getString(R.string.browse_jamendo), mBrowseJamendoPurpleAdapter); separatedAdapter.addSection(getString(R.string.my_library), mMyLibraryPurpleAdapter); mHomeListView.setAdapter(separatedAdapter); mHomeListView.setOnItemClickListener(mHomeItemClickListener); } /** * Launches menu actions */ private OnItemClickListener mHomeItemClickListener = new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int index, long time) { try { PurpleListener listener = ((PurpleEntry) adapterView.getAdapter().getItem(index)).getListener(); if (listener != null) { listener.performAction(); } } catch (ClassCastException e) { Log.w(TAG, "Unexpected position number was occurred"); } } }; /** * Executes news download, JamendoGet2Api.getPopularAlbumsWeek * * @author Lukasz Wisniewski */ private class NewsTask extends AsyncTask<Void, WSError, Album[]> { @Override public void onPreExecute() { mViewFlipper.setDisplayedChild(0); mProgressBar.setText(R.string.loading_news); super.onPreExecute(); } @Override public Album[] doInBackground(Void... params) { JamendoGet2Api server = new JamendoGet2ApiImpl(); Album[] albums = null; try { albums = server.getPopularAlbumsWeek(); } catch (JSONException e) { e.printStackTrace(); } catch (WSError e) { publishProgress(e); } return albums; } @Override public void onPostExecute(Album[] albums) { if (albums != null && albums.length > 0) { mViewFlipper.setDisplayedChild(1); ImageAdapter albumsAdapter = new ImageAdapter(HomeActivity.this); albumsAdapter.setList(albums); mGallery.setAdapter(albumsAdapter); mGallery.setOnItemClickListener(mGalleryListener); mGallery.setSelection(albums.length / 2, true); // animate to center } else { mViewFlipper.setDisplayedChild(2); mFailureBar.setOnRetryListener(new OnClickListener() { @Override public void onClick(View v) { new NewsTask().execute((Void) null); } }); mFailureBar.setText(R.string.connection_fail); } super.onPostExecute(albums); } @Override protected void onProgressUpdate(WSError... values) { Toast.makeText(HomeActivity.this, values[0].getMessage(), Toast.LENGTH_LONG).show(); super.onProgressUpdate(values); } } /** * Background task fetching top 100 tracks from the remote server * It's sort of ugly circumvention of Get2 API limitations<br> * 1 rss + 2 json requests * * @author Lukasz Wisniewski */ private class Top100Task extends LoadingDialog<Void, Playlist> { public Top100Task(Activity activity, int loadingMsg, int failMsg) { super(activity, loadingMsg, failMsg); } @Override public Playlist doInBackground(Void... params) { JamendoGet2Api server = new JamendoGet2ApiImpl(); int[] id = null; try { id = server.getTop100Listened(); // if loading rss failed and no tracks are there - report an error if (id == null) { publishProgress(new WSError((String) getResources().getText(R.string.top100_fail))); return null; } Album[] albums = server.getAlbumsByTracksId(id); Track[] tracks = server.getTracksByTracksId(id, JamendoApplication.getInstance().getStreamEncoding()); if (albums == null || tracks == null) return null; Hashtable<Integer, PlaylistEntry> hashtable = new Hashtable<Integer, PlaylistEntry>(); for (int i = 0; i < tracks.length; i++) { PlaylistEntry playlistEntry = new PlaylistEntry(); playlistEntry.setAlbum(albums[i]); playlistEntry.setTrack(tracks[i]); hashtable.put(tracks[i].getId(), playlistEntry); } // creating playlist in the correct order Playlist playlist = new Playlist(); for (int i = 0; i < id.length; i++) { playlist.addPlaylistEntry(hashtable.get(id[i])); } return playlist; } catch (JSONException e) { e.printStackTrace(); } catch (WSError e) { publishProgress(e); } return null; } @Override public void doStuffWithResult(Playlist playlist) { if (playlist.size() <= 0) { failMsg(); return; } PlayerActivity.launch(HomeActivity.this, playlist); } } private OnItemClickListener mGalleryListener = new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) { Album album = (Album) adapterView.getItemAtPosition(position); PlayerActivity.launch(HomeActivity.this, album); } }; }