Java tutorial
/* * Copyright (C) 2014 The CyanogenMod Project * * 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.cyanogenmod.eleven.ui.fragments; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.provider.MediaStore; import android.support.v4.app.LoaderManager; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.Loader; import android.view.View; import android.widget.AbsListView; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ImageView; import android.widget.TextView; import com.cyanogenmod.eleven.Config; import com.cyanogenmod.eleven.R; import com.cyanogenmod.eleven.adapters.PagerAdapter; import com.cyanogenmod.eleven.adapters.ProfileSongAdapter; import com.cyanogenmod.eleven.cache.ImageFetcher; import com.cyanogenmod.eleven.dragdrop.DragSortListView; import com.cyanogenmod.eleven.dragdrop.DragSortListView.DragScrollProfile; import com.cyanogenmod.eleven.dragdrop.DragSortListView.DropListener; import com.cyanogenmod.eleven.dragdrop.DragSortListView.RemoveListener; import com.cyanogenmod.eleven.loaders.PlaylistSongLoader; import com.cyanogenmod.eleven.menu.FragmentMenuItems; import com.cyanogenmod.eleven.model.Playlist; import com.cyanogenmod.eleven.model.Song; import com.cyanogenmod.eleven.recycler.RecycleHolder; import com.cyanogenmod.eleven.utils.MusicUtils; import com.cyanogenmod.eleven.utils.PlaylistPopupMenuHelper; import com.cyanogenmod.eleven.utils.PopupMenuHelper; import com.cyanogenmod.eleven.utils.PopupMenuHelper.PopupMenuType; import com.cyanogenmod.eleven.utils.SongPopupMenuHelper; import com.cyanogenmod.eleven.widgets.IPopupMenuCallback; import com.cyanogenmod.eleven.widgets.LoadingEmptyContainer; import com.cyanogenmod.eleven.widgets.NoResultsContainer; import java.util.List; import java.util.TreeSet; public class PlaylistDetailFragment extends FadingBarFragment implements LoaderCallbacks<List<Song>>, OnItemClickListener, DropListener, RemoveListener, DragScrollProfile, IChildFragment { /** * LoaderCallbacks identifier */ private static final int LOADER = 0; private DragSortListView mListView; private ProfileSongAdapter mAdapter; private View mHeaderContainer; private ImageView mPlaylistImageView; private LoadingEmptyContainer mLoadingEmptyContainer; private TextView mNumberOfSongs; private TextView mDurationOfPlaylist; /** * The Id of the playlist the songs belong to */ private long mPlaylistId; private String mPlaylistName; /** * Pop up menu helper */ private PopupMenuHelper mPopupMenuHelper; @Override protected String getTitle() { return mPlaylistName; } @Override protected int getLayoutToInflate() { return R.layout.playlist_detail; } @Override protected void onViewCreated() { super.onViewCreated(); setupHero(); setupSongList(); } private void lookupName() { mPlaylistName = MusicUtils.getNameForPlaylist(getActivity(), mPlaylistId); } @Override // DetailFragment protected PopupMenuHelper createActionMenuHelper() { return new PlaylistPopupMenuHelper(getActivity(), getChildFragmentManager(), PopupMenuType.Playlist) { public Playlist getPlaylist(int position) { return new Playlist(mPlaylistId, getTitle(), 0); } }; } @Override // DetailFragment protected int getShuffleTitleId() { return R.string.menu_shuffle_playlist; } @Override // DetailFragment protected void playShuffled() { MusicUtils.playPlaylist(getActivity(), mPlaylistId, true); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); LoaderManager lm = getLoaderManager(); lm.initLoader(0, getArguments(), this); } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mPopupMenuHelper = new SongPopupMenuHelper(getActivity(), getFragmentManager()) { @Override public Song getSong(int position) { if (position == 0) { return null; } return mAdapter.getItem(position); } @Override protected void updateMenuIds(PopupMenuType type, TreeSet<Integer> set) { super.updateMenuIds(type, set); set.add(FragmentMenuItems.REMOVE_FROM_PLAYLIST); set.remove(FragmentMenuItems.DELETE); } @Override protected long getSourceId() { return mPlaylistId; } @Override protected Config.IdType getSourceType() { return Config.IdType.Playlist; } @Override protected void removeFromPlaylist() { mAdapter.remove(mSong); mAdapter.buildCache(); mAdapter.notifyDataSetChanged(); MusicUtils.removeFromPlaylist(getActivity(), mSong.mSongId, mPlaylistId); getLoaderManager().restartLoader(LOADER, null, PlaylistDetailFragment.this); } }; mPlaylistId = getArguments().getLong(Config.ID); lookupName(); } private void setupHero() { mPlaylistImageView = (ImageView) mRootView.findViewById(R.id.image); mHeaderContainer = mRootView.findViewById(R.id.playlist_header); mNumberOfSongs = (TextView) mRootView.findViewById(R.id.number_of_songs_text); mDurationOfPlaylist = (TextView) mRootView.findViewById(R.id.duration_text); final ImageFetcher imageFetcher = ImageFetcher.getInstance(getActivity()); imageFetcher.loadPlaylistArtistImage(mPlaylistId, mPlaylistImageView); } private void setupSongList() { mListView = (DragSortListView) mRootView.findViewById(R.id.list_base); mListView.setOnScrollListener(PlaylistDetailFragment.this); mAdapter = new ProfileSongAdapter(mPlaylistId, getActivity(), R.layout.edit_track_list_item, R.layout.faux_playlist_header); mAdapter.setPopupMenuClickedListener(new IPopupMenuCallback.IListener() { @Override public void onPopupMenuClicked(View v, int position) { mPopupMenuHelper.showPopupMenu(v, position); } }); mListView.setAdapter(mAdapter); // Release any references to the recycled Views mListView.setRecyclerListener(new RecycleHolder()); // 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); // Adjust the progress bar padding to account for the header int padTop = getResources().getDimensionPixelSize(R.dimen.playlist_detail_header_height); mRootView.findViewById(R.id.progressbar).setPadding(0, padTop, 0, 0); // set the loading and empty view container mLoadingEmptyContainer = (LoadingEmptyContainer) mRootView.findViewById(R.id.loading_empty_container); setupNoResultsContainer(mLoadingEmptyContainer.getNoResultsContainer()); mListView.setEmptyView(mLoadingEmptyContainer); } private void setupNoResultsContainer(final NoResultsContainer container) { container.setMainText(R.string.empty_playlist_main); container.setSecondaryText(R.string.empty_playlist_secondary); } /** * {@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) { if (which == 0) { return; } Song song = mAdapter.getItem(which); mAdapter.remove(song); mAdapter.buildCache(); mAdapter.notifyDataSetChanged(); final Uri uri = MediaStore.Audio.Playlists.Members.getContentUri("external", mPlaylistId); getActivity().getContentResolver().delete(uri, MediaStore.Audio.Playlists.Members.AUDIO_ID + "=" + song.mSongId, null); MusicUtils.refresh(); } /** * {@inheritDoc} */ @Override public void drop(int from, int to) { from = Math.max(ProfileSongAdapter.NUM_HEADERS, from); to = Math.max(ProfileSongAdapter.NUM_HEADERS, to); Song song = mAdapter.getItem(from); mAdapter.remove(song); mAdapter.insert(song, to); mAdapter.buildCache(); mAdapter.notifyDataSetChanged(); final int realFrom = from - ProfileSongAdapter.NUM_HEADERS; final int realTo = to - ProfileSongAdapter.NUM_HEADERS; MediaStore.Audio.Playlists.Members.moveItem(getActivity().getContentResolver(), mPlaylistId, realFrom, realTo); } /** * {@inheritDoc} */ @Override public void onItemClick(final AdapterView<?> parent, final View view, final int position, final long id) { if (position == 0) { return; } Cursor cursor = PlaylistSongLoader.makePlaylistSongCursor(getActivity(), mPlaylistId); final long[] list = MusicUtils.getSongListForCursor(cursor); MusicUtils.playAll(getActivity(), list, position - ProfileSongAdapter.NUM_HEADERS, mPlaylistId, Config.IdType.Playlist, false); cursor.close(); cursor = null; } @Override public void onScrollStateChanged(AbsListView view, int scrollState) { super.onScrollStateChanged(view, scrollState); if (scrollState == AbsListView.OnScrollListener.SCROLL_STATE_FLING) { mAdapter.setPauseDiskCache(true); } else { mAdapter.setPauseDiskCache(false); mAdapter.notifyDataSetChanged(); } } protected int getHeaderHeight() { return mHeaderContainer.getHeight(); } protected void setHeaderPosition(float y) { // Offset the header height to account for the faux header y = y - getResources().getDimension(R.dimen.header_bar_height); mHeaderContainer.setY(y); } @Override public Loader<List<Song>> onCreateLoader(int i, Bundle bundle) { mLoadingEmptyContainer.showLoading(); return new PlaylistSongLoader(getActivity(), mPlaylistId); } @Override public void onLoadFinished(final Loader<List<Song>> loader, final List<Song> data) { if (data.isEmpty()) { mLoadingEmptyContainer.showNoResults(); // hide the header container mHeaderContainer.setVisibility(View.INVISIBLE); // Start fresh mAdapter.unload(); } else { // show the header container mHeaderContainer.setVisibility(View.VISIBLE); // pause notifying the adapter and make changes before re-enabling it so that the list // view doesn't reset to the top of the list mAdapter.setNotifyOnChange(false); // Start fresh mAdapter.unload(); // Return the correct count mAdapter.addAll(data); // build the cache mAdapter.buildCache(); // re-enable the notify by calling notify dataset changes mAdapter.notifyDataSetChanged(); // set the number of songs String numberOfSongs = MusicUtils.makeLabel(getActivity(), R.plurals.Nsongs, data.size()); mNumberOfSongs.setText(numberOfSongs); long duration = 0; // Add the data to the adapter for (final Song song : data) { duration += song.mDuration; } // set the duration String durationString = MusicUtils.makeLongTimeString(getActivity(), duration); mDurationOfPlaylist.setText(durationString); } } @Override public void onLoaderReset(final Loader<List<Song>> loader) { // Clear the data in the adapter mAdapter.unload(); } @Override public void restartLoader() { lookupName(); // playlist name may have changed if (mPlaylistName == null) { // if name is null, we've been deleted, so close the this fragment getContainingActivity().postRemoveFragment(this); return; } // since onCreateOptionsMenu can be called after onCreate it is possible for // mActionMenuHelper to be null. In this case, don't bother updating the Name since when // it does create it, it will use the updated name anyways if (mActionMenuHelper != null) { // update action bar title and popup menu handler ((PlaylistPopupMenuHelper) mActionMenuHelper).updateName(mPlaylistName); } getContainingActivity().setActionBarTitle(mPlaylistName); // and reload the song list getLoaderManager().restartLoader(0, getArguments(), this); } @Override public void onMetaChanged() { super.onMetaChanged(); mAdapter.setCurrentlyPlayingTrack(MusicUtils.getCurrentTrack()); } @Override public void onPlaylistChanged() { super.onPlaylistChanged(); restartLoader(); } @Override public PagerAdapter.MusicFragments getMusicFragmentParent() { return PagerAdapter.MusicFragments.PLAYLIST; } }