Java tutorial
/***************************************************************************** * AudioBrowserActivity.java ***************************************************************************** * Copyright 2011-2012 VLC authors and VideoLAN * * This program 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 2 of the License, or * (at your option) any later version. * * This program 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 this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. *****************************************************************************/ package org.videolan.vlc.gui.audio; import java.util.Collections; import java.util.Comparator; import java.util.List; import org.videolan.vlc.AudioServiceController; import org.videolan.vlc.Media; import org.videolan.vlc.MediaLibrary; import org.videolan.vlc.R; import org.videolan.vlc.Util; import org.videolan.vlc.VlcRunnable; import org.videolan.vlc.WeakHandler; import org.videolan.vlc.gui.CommonDialogs; import org.videolan.vlc.interfaces.ISortable; import org.videolan.vlc.widget.FlingViewGroup; import org.videolan.vlc.widget.FlingViewGroup.ViewSwitchListener; import android.app.AlertDialog; import android.graphics.Color; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.view.ContextMenu; import android.view.ContextMenu.ContextMenuInfo; import android.view.LayoutInflater; import android.view.MenuInflater; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.AdapterView.AdapterContextMenuInfo; import android.widget.AdapterView.OnItemClickListener; import android.widget.ExpandableListView; import android.widget.ExpandableListView.ExpandableListContextMenuInfo; import android.widget.ExpandableListView.OnChildClickListener; import android.widget.ExpandableListView.OnGroupClickListener; import android.widget.HorizontalScrollView; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.TextView; import com.actionbarsherlock.app.SherlockFragment; public class AudioBrowserFragment extends SherlockFragment implements ISortable { public final static String TAG = "VLC/AudioBrowserFragment"; private FlingViewGroup mFlingViewGroup; private int mFlingViewPosition = 0; private HorizontalScrollView mHeader; private AudioServiceController mAudioController; private MediaLibrary mMediaLibrary; private AudioListAdapter mSongsAdapter; private AudioPlaylistAdapter mArtistsAdapter; private AudioPlaylistAdapter mAlbumsAdapter; private AudioPlaylistAdapter mGenresAdapter; public final static int SORT_BY_TITLE = 0; public final static int SORT_BY_LENGTH = 1; private boolean mSortReverse = false; private int mSortBy = SORT_BY_TITLE; public final static int MODE_TOTAL = 4; // Number of audio browser modes public final static int MODE_ARTIST = 0; public final static int MODE_ALBUM = 1; public final static int MODE_SONG = 2; public final static int MODE_GENRE = 3; /* All subclasses of Fragment must include a public empty constructor. */ public AudioBrowserFragment() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mAudioController = AudioServiceController.getInstance(); mMediaLibrary = MediaLibrary.getInstance(getActivity()); mSongsAdapter = new AudioListAdapter(getActivity()); mArtistsAdapter = new AudioPlaylistAdapter(getActivity(), R.plurals.albums_quantity, R.plurals.songs_quantity); mAlbumsAdapter = new AudioPlaylistAdapter(getActivity(), R.plurals.songs_quantity, R.plurals.songs_quantity); mGenresAdapter = new AudioPlaylistAdapter(getActivity(), R.plurals.albums_quantity, R.plurals.songs_quantity); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View v = inflater.inflate(R.layout.audio_browser, container, false); mFlingViewGroup = (FlingViewGroup) v.findViewById(R.id.content); mFlingViewGroup.setOnViewSwitchedListener(mViewSwitchListener); mHeader = (HorizontalScrollView) v.findViewById(R.id.header); mHeader.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent e) { // prevent the user from scrolling the header return true; } }); ListView songsList = (ListView) v.findViewById(R.id.songs_list); ExpandableListView artistList = (ExpandableListView) v.findViewById(R.id.artists_list); ExpandableListView albumList = (ExpandableListView) v.findViewById(R.id.albums_list); ExpandableListView genreList = (ExpandableListView) v.findViewById(R.id.genres_list); songsList.setAdapter(mSongsAdapter); artistList.setAdapter(mArtistsAdapter); albumList.setAdapter(mAlbumsAdapter); genreList.setAdapter(mGenresAdapter); songsList.setOnItemClickListener(songListener); artistList.setOnGroupClickListener(playlistListener); albumList.setOnGroupClickListener(playlistListener); genreList.setOnGroupClickListener(playlistListener); artistList.setOnChildClickListener(playlistChildListener); albumList.setOnChildClickListener(playlistChildListener); genreList.setOnChildClickListener(playlistChildListener); registerForContextMenu(songsList); registerForContextMenu(artistList); registerForContextMenu(albumList); registerForContextMenu(genreList); return v; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); updateLists(); } @Override public void onPause() { super.onPause(); mFlingViewPosition = mFlingViewGroup.getPosition(); mMediaLibrary.removeUpdateHandler(mHandler); } @Override public void onResume() { super.onResume(); headerScrollTab(mFlingViewPosition); headerHighlightTab(mFlingViewGroup.getPosition(), mFlingViewPosition); mFlingViewGroup.setPosition(mFlingViewPosition); mMediaLibrary.addUpdateHandler(mHandler); } OnItemClickListener songListener = new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> av, View v, int p, long id) { mAudioController.load(mSongsAdapter.getLocations(), p); AudioPlayerActivity.start(getActivity()); } }; OnGroupClickListener playlistListener = new OnGroupClickListener() { @Override public boolean onGroupClick(ExpandableListView elv, View v, int groupPosition, long id) { AudioPlaylistAdapter adapter = (AudioPlaylistAdapter) elv.getExpandableListAdapter(); if (adapter.getChildrenCount(groupPosition) > 2) return false; String name = adapter.getGroup(groupPosition); AudioListFragment audioList = new AudioListFragment(); Bundle b = new Bundle(); b.putString(AudioListFragment.EXTRA_NAME, name); b.putString(AudioListFragment.EXTRA_NAME2, null); b.putInt(AudioListFragment.EXTRA_MODE, mFlingViewGroup.getPosition()); audioList.setArguments(b); FragmentManager fm = getActivity().getSupportFragmentManager(); FragmentTransaction ft = fm.beginTransaction(); ft.setCustomAnimations(R.anim.anim_enter_left, R.anim.anim_leave_left, R.anim.anim_enter_left, 0); ft.detach(fm.findFragmentByTag("audio")); ft.setCustomAnimations(R.anim.anim_enter_right, R.anim.anim_leave_right, 0, R.anim.anim_leave_right); ft.replace(R.id.fragment_placeholder, audioList, "tracks"); ft.addToBackStack(null); ft.commit(); return true; } }; OnChildClickListener playlistChildListener = new OnChildClickListener() { @Override public boolean onChildClick(ExpandableListView elv, View v, int groupPosition, int childPosition, long id) { AudioPlaylistAdapter adapter = (AudioPlaylistAdapter) elv.getExpandableListAdapter(); String name = adapter.getGroup(groupPosition); String child = adapter.getChild(groupPosition, childPosition); AudioListFragment audioList = new AudioListFragment(); Bundle b = new Bundle(); b.putString(AudioListFragment.EXTRA_NAME, name); b.putString(AudioListFragment.EXTRA_NAME2, child); b.putInt(AudioListFragment.EXTRA_MODE, mFlingViewGroup.getPosition()); audioList.setArguments(b); FragmentManager fm = getActivity().getSupportFragmentManager(); FragmentTransaction ft = fm.beginTransaction(); ft.setCustomAnimations(R.anim.anim_enter_left, R.anim.anim_leave_left, R.anim.anim_enter_left, 0); ft.detach(fm.findFragmentByTag("audio")); ft.setCustomAnimations(R.anim.anim_enter_right, R.anim.anim_leave_right, 0, R.anim.anim_leave_right); ft.replace(R.id.fragment_placeholder, audioList, "tracks"); ft.addToBackStack(null); ft.commit(); return false; } }; @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { MenuInflater inflater = getActivity().getMenuInflater(); inflater.inflate(R.menu.audio_list_browser, menu); if (v.getId() != R.id.songs_list) { menu.setGroupEnabled(R.id.songs_view_only, false); menu.setGroupEnabled(R.id.phone_only, false); } if (!Util.isPhone()) menu.setGroupVisible(R.id.phone_only, false); } @Override public boolean onContextItemSelected(MenuItem item) { if (!getUserVisibleHint()) return super.onContextItemSelected(item); ContextMenuInfo menuInfo = item.getMenuInfo(); if (menuInfo == null) return super.onContextItemSelected(item); int startPosition; int groupPosition; int childPosition; List<String> medias; int id = item.getItemId(); boolean useAllItems = (id == R.id.audio_list_browser_play_all || id == R.id.audio_list_browser_append_all); boolean append = (id == R.id.audio_list_browser_append || id == R.id.audio_list_browser_append_all); if (ExpandableListContextMenuInfo.class.isInstance(menuInfo)) { ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) menuInfo; groupPosition = ExpandableListView.getPackedPositionGroup(info.packedPosition); childPosition = ExpandableListView.getPackedPositionChild(info.packedPosition); if (childPosition < 0) childPosition = 0; } else { AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo; groupPosition = info.position; childPosition = 0; } if (id == R.id.audio_list_browser_delete) { AlertDialog alertDialog = CommonDialogs.deleteMedia(getActivity(), mSongsAdapter.getLocation(groupPosition).get(0), new VlcRunnable(mSongsAdapter.getItem(groupPosition)) { @Override public void run(Object o) { Media aMedia = (Media) o; mMediaLibrary.getMediaItems().remove(aMedia); updateLists(); } }); alertDialog.show(); return true; } if (id == R.id.audio_list_browser_set_song) { AudioUtil.setRingtone(mSongsAdapter.getItem(groupPosition), getActivity()); return true; } if (useAllItems) { startPosition = groupPosition; medias = mSongsAdapter.getLocations(); } else { startPosition = 0; switch (mFlingViewGroup.getPosition()) { case MODE_SONG: medias = mSongsAdapter.getLocation(groupPosition); break; case MODE_ARTIST: medias = mArtistsAdapter.getPlaylist(groupPosition, childPosition); break; case MODE_ALBUM: medias = mAlbumsAdapter.getPlaylist(groupPosition, childPosition); break; case MODE_GENRE: medias = mGenresAdapter.getPlaylist(groupPosition, childPosition); break; default: return true; } } if (append) mAudioController.append(medias); else mAudioController.load(medias, startPosition); AudioPlayerActivity.start(getActivity()); return super.onContextItemSelected(item); } @Override public void onDestroy() { super.onDestroy(); mSongsAdapter.clear(); mArtistsAdapter.clear(); mAlbumsAdapter.clear(); mGenresAdapter.clear(); } private final ViewSwitchListener mViewSwitchListener = new ViewSwitchListener() { int mCurrentPosition = 0; @Override public void onSwitching(float progress) { headerScroll(progress); } @Override public void onSwitched(int position) { headerHighlightTab(mCurrentPosition, position); mCurrentPosition = position; } }; private void headerHighlightTab(int existingPosition, int newPosition) { LinearLayout hl = (LinearLayout) getActivity().findViewById(R.id.header_layout); if (hl == null) return; TextView oldView = (TextView) hl.getChildAt(existingPosition); if (oldView != null) oldView.setTextColor(Color.GRAY); TextView newView = (TextView) hl.getChildAt(newPosition); if (newView != null) newView.setTextColor(Color.WHITE); } private void headerScroll(float progress) { /* * How progress works: * |------|------|------| * 0 1/3 2/3 1 * * To calculate the "progress" of a particular tab, one can use this * formula: * * <tab beginning with 0> * (1 / (total tabs - 1)) */ LinearLayout hl = (LinearLayout) getActivity().findViewById(R.id.header_layout); if (hl == null) return; int width = hl.getChildAt(0).getWidth(); int x = (int) (progress * width); mHeader.smoothScrollTo(x, 0); } private void headerScrollTab(int tab) { headerScroll((float) tab * (1 / (MODE_TOTAL - 1))); } /** * Handle changes on the list */ private Handler mHandler = new AudioBrowserHandler(this); private static class AudioBrowserHandler extends WeakHandler<AudioBrowserFragment> { public AudioBrowserHandler(AudioBrowserFragment owner) { super(owner); } @Override public void handleMessage(Message msg) { AudioBrowserFragment fragment = getOwner(); if (fragment == null) return; switch (msg.what) { case MediaLibrary.MEDIA_ITEMS_UPDATED: fragment.updateLists(); break; } } }; private final Comparator<Media> byName = new Comparator<Media>() { @Override public int compare(Media m1, Media m2) { return String.CASE_INSENSITIVE_ORDER.compare(m1.getTitle(), m2.getTitle()); }; }; private final Comparator<Media> byMRL = new Comparator<Media>() { @Override public int compare(Media m1, Media m2) { return String.CASE_INSENSITIVE_ORDER.compare(m1.getLocation(), m2.getLocation()); }; }; private final Comparator<Media> byLength = new Comparator<Media>() { @Override public int compare(Media m1, Media m2) { if (m1.getLength() > m2.getLength()) return -1; if (m1.getLength() < m2.getLength()) return 1; else return 0; }; }; private final Comparator<Media> byAlbum = new Comparator<Media>() { @Override public int compare(Media m1, Media m2) { int res = String.CASE_INSENSITIVE_ORDER.compare(m1.getAlbum(), m2.getAlbum()); if (res == 0) res = byMRL.compare(m1, m2); return res; }; }; private final Comparator<Media> byArtist = new Comparator<Media>() { @Override public int compare(Media m1, Media m2) { int res = String.CASE_INSENSITIVE_ORDER.compare(m1.getArtist(), m2.getArtist()); if (res == 0) res = byAlbum.compare(m1, m2); return res; }; }; private final Comparator<Media> byGenre = new Comparator<Media>() { @Override public int compare(Media m1, Media m2) { int res = String.CASE_INSENSITIVE_ORDER.compare(m1.getGenre(), m2.getGenre()); if (res == 0) res = byArtist.compare(m1, m2); return res; }; }; private void updateLists() { List<Media> audioList = MediaLibrary.getInstance(getActivity()).getAudioItems(); mSongsAdapter.clear(); mArtistsAdapter.clear(); mAlbumsAdapter.clear(); mGenresAdapter.clear(); switch (mSortBy) { case SORT_BY_LENGTH: Collections.sort(audioList, byLength); break; case SORT_BY_TITLE: default: Collections.sort(audioList, byName); break; } if (mSortReverse) { Collections.reverse(audioList); } for (int i = 0; i < audioList.size(); i++) mSongsAdapter.add(audioList.get(i)); Collections.sort(audioList, byArtist); for (int i = 0; i < audioList.size(); i++) { Media media = audioList.get(i); mArtistsAdapter.add(media.getArtist(), null, media); mArtistsAdapter.add(media.getArtist(), media.getAlbum(), media); } Collections.sort(audioList, byAlbum); for (int i = 0; i < audioList.size(); i++) { Media media = audioList.get(i); mAlbumsAdapter.add(media.getAlbum(), null, media); } Collections.sort(audioList, byGenre); for (int i = 0; i < audioList.size(); i++) { Media media = audioList.get(i); mGenresAdapter.add(media.getGenre(), null, media); mGenresAdapter.add(media.getGenre(), media.getAlbum(), media); } mSongsAdapter.notifyDataSetChanged(); mArtistsAdapter.notifyDataSetChanged(); mAlbumsAdapter.notifyDataSetChanged(); mGenresAdapter.notifyDataSetChanged(); } @Override public void sortBy(int sortby) { if (mSortBy == sortby) { mSortReverse = !mSortReverse; } else { mSortBy = sortby; mSortReverse = false; } updateLists(); } }