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 ru.mtuci.musicanalyzer.apollo.ui.fragments; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.Loader; import android.text.TextUtils; import android.view.ContextMenu; import android.view.ContextMenu.ContextMenuInfo; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.SubMenu; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.AdapterView.AdapterContextMenuInfo; import android.widget.AdapterView.OnItemClickListener; import ru.mtuci.musicanalyzer.apollo.R; import ru.mtuci.musicanalyzer.apollo.adapters.SongAdapter; import ru.mtuci.musicanalyzer.apollo.dragdrop.DragSortListView; import ru.mtuci.musicanalyzer.apollo.dragdrop.DragSortListView.DragScrollProfile; import ru.mtuci.musicanalyzer.apollo.dragdrop.DragSortListView.DropListener; import ru.mtuci.musicanalyzer.apollo.dragdrop.DragSortListView.RemoveListener; import ru.mtuci.musicanalyzer.apollo.loaders.NowPlayingCursor; import ru.mtuci.musicanalyzer.apollo.loaders.QueueLoader; import ru.mtuci.musicanalyzer.apollo.menu.CreateNewPlaylist; import ru.mtuci.musicanalyzer.apollo.menu.FragmentMenuItems; import ru.mtuci.musicanalyzer.apollo.model.Song; import ru.mtuci.musicanalyzer.apollo.provider.FavoritesStore; import ru.mtuci.musicanalyzer.apollo.recycler.RecycleHolder; import ru.mtuci.musicanalyzer.apollo.utils.MusicUtils; import ru.mtuci.musicanalyzer.apollo.utils.NavUtils; import com.viewpagerindicator.TitlePageIndicator; import java.util.List; /** * This class is used to display all of the songs in the queue. * * @author Andrew Neal (andrewdneal@gmail.com) */ public class QueueFragment extends Fragment implements LoaderCallbacks<List<Song>>, OnItemClickListener, DropListener, RemoveListener, DragScrollProfile { /** * Used to keep context menu items from bleeding into other fragments */ private static final int GROUP_ID = 13; /** * LoaderCallbacks identifier */ private static final int LOADER = 0; /** * The adapter for the list */ private SongAdapter mAdapter; /** * The list view */ private DragSortListView mListView; /** * Represents a song */ private Song mSong; /** * Position of a context menu item */ private int mSelectedPosition; /** * Id of a context menu item */ private long mSelectedId; /** * Song, album, and artist name used in the context menu */ private String mSongName, mAlbumName, mArtistName; /** * Empty constructor as per the {@link Fragment} documentation */ public QueueFragment() { } /** * {@inheritDoc} */ @Override public void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Create the adpater mAdapter = new SongAdapter(getActivity(), R.layout.edit_track_list_item); } /** * {@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 = (DragSortListView) rootView.findViewById(R.id.list_base); // Set the data behind the list 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); // Set the drop listener mListView.setDropListener(this); // Set the swipe to remove listener mListView.setRemoveListener(this); // Quick scroll while dragging mListView.setDragScrollProfile(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 onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) { inflater.inflate(R.menu.queue, menu); super.onCreateOptionsMenu(menu, inflater); } /** * {@inheritDoc} */ @Override public boolean onOptionsItemSelected(final MenuItem item) { switch (item.getItemId()) { case R.id.menu_save_queue: NowPlayingCursor queue = (NowPlayingCursor) QueueLoader.makeQueueCursor(getActivity()); CreateNewPlaylist.getInstance(MusicUtils.getSongListForCursor(queue)).show(getFragmentManager(), "CreatePlaylist"); queue.close(); queue = null; return true; case R.id.menu_clear_queue: MusicUtils.clearQueue(); NavUtils.goHome(getActivity()); return true; default: break; } return super.onOptionsItemSelected(item); } /** * {@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; mSelectedPosition = info.position; // Creat a new song mSong = mAdapter.getItem(mSelectedPosition); mSelectedId = mSong.mSongId; mSongName = mSong.mSongName; mAlbumName = mSong.mAlbumName; mArtistName = mSong.mArtistName; // Play the song next menu.add(GROUP_ID, FragmentMenuItems.PLAY_NEXT, Menu.NONE, getString(R.string.context_menu_play_next)); // Add the song to the queue menu.add(GROUP_ID, FragmentMenuItems.ADD_TO_QUEUE, Menu.NONE, getString(R.string.add_to_queue)); // Add the song to a playlist final SubMenu subMenu = menu.addSubMenu(GROUP_ID, FragmentMenuItems.ADD_TO_PLAYLIST, Menu.NONE, R.string.add_to_playlist); MusicUtils.makePlaylistMenu(getActivity(), GROUP_ID, subMenu, true); // View more content by the song artist menu.add(GROUP_ID, FragmentMenuItems.MORE_BY_ARTIST, Menu.NONE, getString(R.string.context_menu_more_by_artist)); // Make the song a ringtone menu.add(GROUP_ID, FragmentMenuItems.USE_AS_RINGTONE, Menu.NONE, getString(R.string.context_menu_use_as_ringtone)); // Delete the song // menu.add(GROUP_ID, FragmentMenuItems.DELETE, Menu.NONE, // getString(R.string.context_menu_delete)); } /** * {@inheritDoc} */ @Override public boolean onContextItemSelected(final android.view.MenuItem item) { if (item.getGroupId() == GROUP_ID) { switch (item.getItemId()) { case FragmentMenuItems.PLAY_NEXT: NowPlayingCursor queue = (NowPlayingCursor) QueueLoader.makeQueueCursor(getActivity()); queue.removeItem(mSelectedPosition); queue.close(); queue = null; MusicUtils.playNext(new long[] { mSelectedId }); getLoaderManager().restartLoader(LOADER, null, this); return true; case FragmentMenuItems.ADD_TO_QUEUE: MusicUtils.addToQueue(getActivity(), new long[] { mSelectedId }); return true; case FragmentMenuItems.ADD_TO_FAVORITES: FavoritesStore.getInstance(getActivity()).addSongId(mSelectedId, mSongName, mAlbumName, mArtistName); return true; case FragmentMenuItems.NEW_PLAYLIST: CreateNewPlaylist.getInstance(new long[] { mSelectedId }).show(getFragmentManager(), "CreatePlaylist"); return true; case FragmentMenuItems.PLAYLIST_SELECTED: final long mPlaylistId = item.getIntent().getLongExtra("playlist", 0); MusicUtils.addToPlaylist(getActivity(), new long[] { mSelectedId }, mPlaylistId); return true; case FragmentMenuItems.MORE_BY_ARTIST: NavUtils.openArtistProfile(getActivity(), mArtistName); return true; case FragmentMenuItems.USE_AS_RINGTONE: MusicUtils.setRingtone(getActivity(), mSelectedId); return true; // case FragmentMenuItems.DELETE: // 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) { // When selecting a track from the queue, just jump there instead of // reloading the queue. This is both faster, and prevents accidentally // dropping out of party shuffle. MusicUtils.setQueuePosition(position); } /** * {@inheritDoc} */ @Override public Loader<List<Song>> onCreateLoader(final int id, final Bundle args) { return new QueueLoader(getActivity()); } /** * {@inheritDoc} */ @Override public void onLoadFinished(final Loader<List<Song>> loader, final List<Song> data) { // Check for any errors if (data.isEmpty()) { return; } // Start fresh mAdapter.unload(); // Add the data to the adpater for (final Song song : data) { mAdapter.add(song); } // Build the cache mAdapter.buildCache(); } /** * {@inheritDoc} */ @Override public void onLoaderReset(final Loader<List<Song>> loader) { // Clear the data in the adapter mAdapter.unload(); } /** * {@inheritDoc} */ @Override public float getSpeed(final float w, final long t) { if (w > 0.8f) { return mAdapter.getCount() / 0.001f; } else { return 10.0f * w; } } /** * {@inheritDoc} */ @Override public void remove(final int which) { mSong = mAdapter.getItem(which); mAdapter.remove(mSong); mAdapter.notifyDataSetChanged(); MusicUtils.removeTrack(mSong.mSongId); // Build the cache mAdapter.buildCache(); } /** * {@inheritDoc} */ @Override public void drop(final int from, final int to) { mSong = mAdapter.getItem(from); mAdapter.remove(mSong); mAdapter.insert(mSong, to); mAdapter.notifyDataSetChanged(); MusicUtils.moveQueueItem(from, to); // Build the cache mAdapter.buildCache(); } /** * Scrolls the list to the currently playing song when the user touches the * header in the {@link TitlePageIndicator}. */ public void scrollToCurrentSong() { final int currentSongPosition = getItemPositionBySong(); if (currentSongPosition != 0) { mListView.setSelection(currentSongPosition); } } /** * @return The position of an item in the list based on the name of the * currently playing song. */ private int getItemPositionBySong() { final long trackId = MusicUtils.getCurrentAudioId(); if (mAdapter == null) { return 0; } for (int i = 0; i < mAdapter.getCount(); i++) { if (mAdapter.getItem(i).mSongId == trackId) { return i; } } return 0; } /** * Called to restart the loader callbacks */ public void refreshQueue() { if (isAdded()) { getLoaderManager().restartLoader(LOADER, null, this); } } }