Java tutorial
/* * Copyright (C) 2012 Andrew Neal 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.andrew.apollo.ui.fragments; import android.app.Activity; import android.app.AlertDialog; import android.content.ContentUris; import android.content.Context; import android.content.DialogInterface; import android.content.DialogInterface.OnClickListener; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.provider.MediaStore; import android.support.v4.app.Fragment; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.Loader; import android.view.ContextMenu; import android.view.ContextMenu.ContextMenuInfo; import android.view.LayoutInflater; import android.view.Menu; 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 com.actionbarsherlock.app.SherlockFragment; import com.andrew.apollo.Config; import com.andrew.apollo.MusicStateListener; import com.andrew.apollo.R; import com.andrew.apollo.adapters.PlaylistAdapter; import com.andrew.apollo.loaders.PlaylistLoader; import com.andrew.apollo.menu.FragmentMenuItems; import com.andrew.apollo.menu.RenamePlaylist; import com.andrew.apollo.model.Playlist; import com.andrew.apollo.recycler.RecycleHolder; import com.andrew.apollo.ui.activities.BaseActivity; import com.andrew.apollo.ui.activities.ProfileActivity; import com.andrew.apollo.utils.MusicUtils; import java.util.List; /** * This class is used to display all of the playlists on a user's device. * * @author Andrew Neal (andrewdneal@gmail.com) */ public class PlaylistFragment extends SherlockFragment implements LoaderCallbacks<List<Playlist>>, OnItemClickListener, MusicStateListener { /** * Used to keep context menu items from bleeding into other fragments */ private static final int GROUP_ID = 0; /** * LoaderCallbacks identifier */ private static final int LOADER = 0; /** * The adapter for the list */ private PlaylistAdapter mAdapter; /** * The list view */ private ListView mListView; /** * Represents a playlist */ private Playlist mPlaylist; /** * Empty constructor as per the {@link Fragment} documentation */ public PlaylistFragment() { } /** * {@inheritDoc} */ @Override public void onAttach(final Activity activity) { super.onAttach(activity); // Register the music status listener ((BaseActivity) activity).setMusicStateListenerListener(this); } /** * {@inheritDoc} */ @Override public void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Create the adpater mAdapter = new PlaylistAdapter(getSherlockActivity(), R.layout.list_item_simple); } /** * {@inheritDoc} */ @Override public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) { // The View for the fragment's UI final ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.list_base, null); // Initialize the list mListView = (ListView) rootView.findViewById(R.id.list_base); // Set the data behind the grid mListView.setAdapter(mAdapter); // Release any references to the recycled Views mListView.setRecyclerListener(new RecycleHolder()); // Listen for ContextMenus to be created mListView.setOnCreateContextMenuListener(this); // Play the selected song mListView.setOnItemClickListener(this); return rootView; } /** * {@inheritDoc} */ @Override public void onActivityCreated(final Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); // Enable the options menu setHasOptionsMenu(true); // Start the loader getLoaderManager().initLoader(LOADER, null, this); } /** * {@inheritDoc} */ @Override public void onCreateContextMenu(final ContextMenu menu, final View v, final ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); // Get the position of the selected item final AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo; final int mPosition = info.position; // Create a new playlist mPlaylist = mAdapter.getItem(mPosition); // Play the playlist menu.add(GROUP_ID, FragmentMenuItems.PLAY_SELECTION, Menu.NONE, R.string.context_menu_play_selection); // Add the playlist to the queue menu.add(GROUP_ID, FragmentMenuItems.ADD_TO_QUEUE, Menu.NONE, R.string.add_to_queue); // Delete and rename (user made playlists) if (info.position > 1) { menu.add(GROUP_ID, FragmentMenuItems.RENAME_PLAYLIST, Menu.NONE, R.string.context_menu_rename_playlist); menu.add(GROUP_ID, FragmentMenuItems.DELETE, Menu.NONE, R.string.context_menu_delete); } } /** * {@inheritDoc} */ @Override public boolean onContextItemSelected(final android.view.MenuItem item) { if (item.getGroupId() == GROUP_ID) { final AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo(); switch (item.getItemId()) { case FragmentMenuItems.PLAY_SELECTION: if (info.position == 0) { MusicUtils.playFavorites(getSherlockActivity()); } else if (info.position == 1) { MusicUtils.playLastAdded(getSherlockActivity()); } else { MusicUtils.playPlaylist(getSherlockActivity(), mPlaylist.mPlaylistId); } return true; case FragmentMenuItems.ADD_TO_QUEUE: long[] list = null; if (info.position == 0) { list = MusicUtils.getSongListForFavorites(getSherlockActivity()); } else if (info.position == 1) { list = MusicUtils.getSongListForLastAdded(getSherlockActivity()); } else { list = MusicUtils.getSongListForPlaylist(getSherlockActivity(), mPlaylist.mPlaylistId); } MusicUtils.addToQueue(getSherlockActivity(), list); return true; case FragmentMenuItems.RENAME_PLAYLIST: RenamePlaylist.getInstance(Long.valueOf(mPlaylist.mPlaylistId)).show(getFragmentManager(), "RenameDialog"); return true; case FragmentMenuItems.DELETE: buildDeleteDialog().show(); return true; default: break; } } return super.onContextItemSelected(item); } /** * {@inheritDoc} */ @Override public void onItemClick(final AdapterView<?> parent, final View view, final int position, final long id) { final Bundle bundle = new Bundle(); mPlaylist = mAdapter.getItem(position); String playlistName; // Favorites list if (position == 0) { playlistName = getString(R.string.playlist_favorites); bundle.putString(Config.MIME_TYPE, getString(R.string.playlist_favorites)); // Last added } else if (position == 1) { playlistName = getString(R.string.playlist_last_added); bundle.putString(Config.MIME_TYPE, getString(R.string.playlist_last_added)); } else { // User created playlistName = mPlaylist.mPlaylistName; bundle.putString(Config.MIME_TYPE, MediaStore.Audio.Playlists.CONTENT_TYPE); bundle.putLong(Config.ID, Long.valueOf(mPlaylist.mPlaylistId)); } bundle.putString(Config.NAME, playlistName); // Create the intent to launch the profile activity final Intent intent = new Intent(getSherlockActivity(), ProfileActivity.class); intent.putExtras(bundle); startActivity(intent); } /** * {@inheritDoc} */ @Override public Loader<List<Playlist>> onCreateLoader(final int id, final Bundle args) { return new PlaylistLoader(getSherlockActivity()); } /** * {@inheritDoc} */ @Override public void onLoadFinished(final Loader<List<Playlist>> loader, final List<Playlist> data) { // Check for any errors if (data.isEmpty()) { return; } // Start fresh mAdapter.unload(); // Add the data to the adpater for (final Playlist playlist : data) { mAdapter.add(playlist); } // Build the cache mAdapter.buildCache(); } /** * {@inheritDoc} */ @Override public void onLoaderReset(final Loader<List<Playlist>> loader) { // Clear the data in the adapter mAdapter.unload(); } /** * {@inheritDoc} */ @Override public void restartLoader() { // Refresh the list when a playlist is deleted or renamed getLoaderManager().restartLoader(LOADER, null, this); } /** * {@inheritDoc} */ @Override public void onMetaChanged() { // Nothing to do } /** * Create a new {@link AlertDialog} for easy playlist deletion * * @param context The {@link Context} to use * @param title The title of the playlist being deleted * @param id The ID of the playlist being deleted * @return A new {@link AlertDialog} used to delete playlists */ private final AlertDialog buildDeleteDialog() { return new AlertDialog.Builder(getSherlockActivity()) .setTitle(getString(R.string.context_menu_delete) + " " + mPlaylist.mPlaylistName) .setPositiveButton(R.string.context_menu_delete, new OnClickListener() { @Override public void onClick(final DialogInterface dialog, final int which) { final Uri mUri = ContentUris.withAppendedId(MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI, Long.valueOf(mPlaylist.mPlaylistId)); getSherlockActivity().getContentResolver().delete(mUri, null, null); MusicUtils.refresh(); } }).setNegativeButton(R.string.cancel, new OnClickListener() { @Override public void onClick(final DialogInterface dialog, final int which) { dialog.dismiss(); } }).setMessage(R.string.cannot_be_undone).create(); } }