Java tutorial
/* * YAMMP - Yet Another Multi Media Player for android * Copyright (C) 2011-2012 Mariotaku Lee <mariotaku.lee@gmail.com> * * This file is part of YAMMP. * * YAMMP 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 3 of the License, or * (at your option) any later version. * * YAMMP 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 YAMMP. If not, see <http://www.gnu.org/licenses/>. */ package org.yammp.app; import org.yammp.Constants; import org.yammp.R; import org.yammp.util.MusicUtils; import org.yammp.util.PreferencesEditor; import org.yammp.widget.TouchInterceptor; import org.yammp.widget.TouchInterceptor.OnDropListener; import org.yammp.widget.TouchInterceptor.OnRemoveListener; import com.actionbarsherlock.app.SherlockListFragment; import android.app.SearchManager; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.provider.MediaStore; import android.provider.MediaStore.Audio; import android.provider.MediaStore.Audio.Genres; import android.provider.MediaStore.Audio.Playlists; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.support.v4.widget.SimpleCursorAdapter; import android.view.ContextMenu; import android.view.ContextMenu.ContextMenuInfo; import android.view.LayoutInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView.AdapterContextMenuInfo; import android.widget.ListView; import android.widget.TextView; public class TrackFragment extends SherlockListFragment implements LoaderCallbacks<Cursor>, Constants, OnDropListener, OnRemoveListener { private TracksAdapter mAdapter; private Cursor mCursor; private int mSelectedPosition; private long mSelectedId; private String mCurrentTrackName, mCurrentAlbumName, mCurrentArtistNameForAlbum; private int mIdIdx, mTrackIdx, mAlbumIdx, mArtistIdx, mDurationIdx; private boolean mEditMode = false; private ListView mListView; long mPlaylistId = -1; private BroadcastReceiver mMediaStatusReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { if (getListView() != null) { getListView().invalidateViews(); } } }; public TrackFragment() { } public TrackFragment(Bundle arguments) { setArguments(arguments); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); // We have a menu item to show in action bar. setHasOptionsMenu(true); if (getArguments() != null) { String mimetype = getArguments().getString(INTENT_KEY_TYPE); if (Audio.Playlists.CONTENT_TYPE.equals(mimetype)) { mPlaylistId = getArguments().getLong(Audio.Playlists._ID); switch ((int) mPlaylistId) { case (int) PLAYLIST_QUEUE: mEditMode = true; break; case (int) PLAYLIST_FAVORITES: mEditMode = true; break; default: if (mPlaylistId > 0) { mEditMode = true; } break; } } } mAdapter = new TracksAdapter(getActivity(), mEditMode ? R.layout.track_list_item_edit_mode : R.layout.track_list_item, null, new String[] {}, new int[] {}, 0); setListAdapter(mAdapter); mListView = getListView(); mListView.setOnCreateContextMenuListener(this); getLoaderManager().initLoader(0, null, this); } @Override public boolean onContextItemSelected(MenuItem item) { if (mCursor == null) return false; Intent intent; switch (item.getItemId()) { case PLAY_SELECTION: int position = mSelectedPosition; if (mPlaylistId == PLAYLIST_QUEUE) { MusicUtils.setQueuePosition(position); return true; } MusicUtils.playAll(getActivity(), mCursor, position); return true; case DELETE_ITEMS: intent = new Intent(INTENT_DELETE_ITEMS); Bundle bundle = new Bundle(); bundle.putString(INTENT_KEY_PATH, Uri.withAppendedPath(Audio.Media.EXTERNAL_CONTENT_URI, Uri.encode(String.valueOf(mSelectedId))) .toString()); intent.putExtras(bundle); startActivity(intent); return true; case SEARCH: doSearch(); return true; } return super.onContextItemSelected(item); } @Override public void onCreateContextMenu(ContextMenu menu, View view, ContextMenuInfo info) { if (mCursor == null) return; getActivity().getMenuInflater().inflate(R.menu.music_browser_item, menu); AdapterContextMenuInfo adapterinfo = (AdapterContextMenuInfo) info; mSelectedPosition = adapterinfo.position; mCursor.moveToPosition(mSelectedPosition); try { mSelectedId = mCursor.getLong(mIdIdx); } catch (IllegalArgumentException ex) { mSelectedId = adapterinfo.id; } mCurrentAlbumName = mCursor.getString(mAlbumIdx); mCurrentArtistNameForAlbum = mCursor.getString(mArtistIdx); mCurrentTrackName = mCursor.getString(mTrackIdx); menu.setHeaderTitle(mCurrentTrackName); } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { String[] cols = new String[] { Audio.Media._ID, Audio.Media.TITLE, Audio.Media.DATA, Audio.Media.ALBUM, Audio.Media.ARTIST, Audio.Media.ARTIST_ID, Audio.Media.DURATION }; StringBuilder where = new StringBuilder(); String sort_order = Audio.Media.TITLE; where.append(Audio.Media.IS_MUSIC + "=1"); where.append(" AND " + Audio.Media.TITLE + " != ''"); Uri uri = Audio.Media.EXTERNAL_CONTENT_URI; if (getArguments() != null) { String mimetype = getArguments().getString(INTENT_KEY_TYPE); if (Audio.Playlists.CONTENT_TYPE.equals(mimetype)) { where = new StringBuilder(); where.append(Playlists.Members.IS_MUSIC + "=1"); where.append(" AND " + Playlists.Members.TITLE + " != ''"); switch ((int) mPlaylistId) { case (int) PLAYLIST_QUEUE: uri = Audio.Media.EXTERNAL_CONTENT_URI; long[] mNowPlaying = MusicUtils.getQueue(); if (mNowPlaying.length == 0) return null; where = new StringBuilder(); where.append(MediaStore.Audio.Media._ID + " IN ("); if (mNowPlaying == null || mNowPlaying.length <= 0) return null; for (long queue_id : mNowPlaying) { where.append(queue_id + ","); } where.deleteCharAt(where.length() - 1); where.append(")"); sort_order = null; break; case (int) PLAYLIST_FAVORITES: long favorites_id = MusicUtils.getFavoritesId(getActivity()); cols = new String[] { Playlists.Members._ID, Playlists.Members.AUDIO_ID, Playlists.Members.TITLE, Playlists.Members.ALBUM, Playlists.Members.ARTIST, Playlists.Members.DURATION }; uri = Playlists.Members.getContentUri(EXTERNAL_VOLUME, favorites_id); sort_order = Playlists.Members.DEFAULT_SORT_ORDER; break; case (int) PLAYLIST_RECENTLY_ADDED: int X = new PreferencesEditor(getActivity()).getIntPref(PREF_KEY_NUMWEEKS, 2) * 3600 * 24 * 7; where = new StringBuilder(); where.append(Audio.Media.TITLE + " != ''"); where.append(" AND " + Audio.Media.IS_MUSIC + "=1"); where.append(" AND " + MediaStore.MediaColumns.DATE_ADDED + ">" + (System.currentTimeMillis() / 1000 - X)); sort_order = Audio.Media.DATE_ADDED; break; case (int) PLAYLIST_PODCASTS: where = new StringBuilder(); where.append(Audio.Media.TITLE + " != ''"); where.append(" AND " + Audio.Media.IS_PODCAST + "=1"); sort_order = Audio.Media.DATE_ADDED; break; default: if (id < 0) return null; cols = new String[] { Playlists.Members._ID, Playlists.Members.AUDIO_ID, Playlists.Members.TITLE, Playlists.Members.ALBUM, Playlists.Members.ARTIST, Playlists.Members.DURATION }; uri = Playlists.Members.getContentUri(EXTERNAL_VOLUME, mPlaylistId); sort_order = Playlists.Members.DEFAULT_SORT_ORDER; break; } } else if (Audio.Genres.CONTENT_TYPE.equals(mimetype)) { long genre_id = getArguments().getLong(Audio.Genres._ID); uri = Genres.Members.getContentUri(EXTERNAL_VOLUME, genre_id); cols = new String[] { Genres.Members._ID, Genres.Members.TITLE, Genres.Members.ALBUM, Genres.Members.ARTIST, Genres.Members.DURATION }; where = new StringBuilder(); where.append(Genres.Members.IS_MUSIC + "=1"); where.append(" AND " + Genres.Members.TITLE + " != ''"); sort_order = Genres.Members.DEFAULT_SORT_ORDER; } else { if (Audio.Albums.CONTENT_TYPE.equals(mimetype)) { sort_order = Audio.Media.TRACK; long album_id = getArguments().getLong(Audio.Albums._ID); where.append(" AND " + Audio.Media.ALBUM_ID + "=" + album_id); } else if (Audio.Artists.CONTENT_TYPE.equals(mimetype)) { sort_order = Audio.Media.TITLE; long artist_id = getArguments().getLong(Audio.Artists._ID); where.append(" AND " + Audio.Media.ARTIST_ID + "=" + artist_id); } } } // Now create and return a CursorLoader that will take care of // creating a Cursor for the data being displayed. return new CursorLoader(getActivity(), uri, cols, where.toString(), null, sort_order); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.tracks_browser, container, false); return view; } @Override public void onDrop(int from, int to) { if (mPlaylistId >= 0) { Playlists.Members.moveItem(getActivity().getContentResolver(), mPlaylistId, from, to); } else if (mPlaylistId == PLAYLIST_QUEUE) { MusicUtils.moveQueueItem(from, to); reloadQueueCursor(); } else if (mPlaylistId == PLAYLIST_FAVORITES) { long favorites_id = MusicUtils.getFavoritesId(getActivity()); Playlists.Members.moveItem(getActivity().getContentResolver(), favorites_id, from, to); } mAdapter.notifyDataSetChanged(); } @Override public void onListItemClick(ListView l, View v, int position, long id) { if (mCursor == null || mCursor.getCount() == 0) return; // 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. if (mPlaylistId == PLAYLIST_QUEUE) { MusicUtils.setQueueId(id); return; } MusicUtils.playAll(getActivity(), mCursor, position); } @Override public void onLoaderReset(Loader<Cursor> loader) { mCursor = null; mAdapter.changeCursor(null); } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { if (data == null) { getActivity().finish(); return; } mCursor = data; if (getArguments() != null && Playlists.CONTENT_TYPE.equals(getArguments().getString(INTENT_KEY_TYPE)) && (getArguments().getLong(Playlists._ID) >= 0 || getArguments().getLong(Playlists._ID) == PLAYLIST_FAVORITES)) { mIdIdx = data.getColumnIndexOrThrow(Playlists.Members.AUDIO_ID); mTrackIdx = data.getColumnIndexOrThrow(Playlists.Members.TITLE); mAlbumIdx = data.getColumnIndexOrThrow(Playlists.Members.ALBUM); mArtistIdx = data.getColumnIndexOrThrow(Playlists.Members.ARTIST); mDurationIdx = data.getColumnIndexOrThrow(Playlists.Members.DURATION); } else if (getArguments() != null && Genres.CONTENT_TYPE.equals(getArguments().getString(INTENT_KEY_TYPE))) { mIdIdx = data.getColumnIndexOrThrow(Genres.Members._ID); mTrackIdx = data.getColumnIndexOrThrow(Genres.Members.TITLE); mAlbumIdx = data.getColumnIndexOrThrow(Genres.Members.ALBUM); mArtistIdx = data.getColumnIndexOrThrow(Genres.Members.ARTIST); mDurationIdx = data.getColumnIndexOrThrow(Genres.Members.DURATION); } else { mIdIdx = data.getColumnIndexOrThrow(Audio.Media._ID); mTrackIdx = data.getColumnIndexOrThrow(Audio.Media.TITLE); mAlbumIdx = data.getColumnIndexOrThrow(Audio.Media.ALBUM); mArtistIdx = data.getColumnIndexOrThrow(Audio.Media.ARTIST); mDurationIdx = data.getColumnIndexOrThrow(Audio.Media.DURATION); } mAdapter.changeCursor(data); if (mEditMode) { ((TouchInterceptor) mListView).setDropListener(this); ((TouchInterceptor) mListView).setRemoveListener(this); mListView.setDivider(null); mListView.setSelector(R.drawable.list_selector_background); } } @Override public void onRemove(int which) { removePlaylistItem(which); } @Override public void onSaveInstanceState(Bundle outState) { outState.putAll(getArguments() != null ? getArguments() : new Bundle()); super.onSaveInstanceState(outState); } @Override public void onStart() { super.onStart(); IntentFilter filter = new IntentFilter(); filter.addAction(BROADCAST_META_CHANGED); filter.addAction(BROADCAST_QUEUE_CHANGED); getActivity().registerReceiver(mMediaStatusReceiver, filter); } @Override public void onStop() { getActivity().unregisterReceiver(mMediaStatusReceiver); super.onStop(); } private void doSearch() { CharSequence title = null; String query = null; Intent i = new Intent(); i.setAction(MediaStore.INTENT_ACTION_MEDIA_SEARCH); i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); title = mCurrentTrackName; if (MediaStore.UNKNOWN_STRING.equals(mCurrentArtistNameForAlbum)) { query = mCurrentTrackName; } else { query = mCurrentArtistNameForAlbum + " " + mCurrentTrackName; i.putExtra(MediaStore.EXTRA_MEDIA_ARTIST, mCurrentArtistNameForAlbum); } if (MediaStore.UNKNOWN_STRING.equals(mCurrentAlbumName)) { i.putExtra(MediaStore.EXTRA_MEDIA_ALBUM, mCurrentAlbumName); } i.putExtra(MediaStore.EXTRA_MEDIA_FOCUS, "audio/*"); title = getString(R.string.mediasearch, title); i.putExtra(SearchManager.QUERY, query); startActivity(Intent.createChooser(i, title)); } private void reloadQueueCursor() { if (mPlaylistId == PLAYLIST_QUEUE) { String[] cols = new String[] { Audio.Media._ID, Audio.Media.TITLE, Audio.Media.DATA, Audio.Media.ALBUM, Audio.Media.ARTIST, Audio.Media.ARTIST_ID, Audio.Media.DURATION }; StringBuilder where = new StringBuilder(); where.append(Playlists.Members.IS_MUSIC + "=1"); where.append(" AND " + Playlists.Members.TITLE + " != ''"); Uri uri = Audio.Media.EXTERNAL_CONTENT_URI; long[] mNowPlaying = MusicUtils.getQueue(); if (mNowPlaying.length == 0) { // return; } where = new StringBuilder(); where.append(MediaStore.Audio.Media._ID + " IN ("); for (int i = 0; i < mNowPlaying.length; i++) { where.append(mNowPlaying[i]); if (i < mNowPlaying.length - 1) { where.append(","); } } where.append(")"); mCursor = MusicUtils.query(getActivity(), uri, cols, where.toString(), null, null); mAdapter.changeCursor(mCursor); } } private void removePlaylistItem(int which) { mCursor.moveToPosition(which); long id = mCursor.getLong(mIdIdx); if (mPlaylistId >= 0) { Uri uri = Playlists.Members.getContentUri("external", mPlaylistId); getActivity().getContentResolver().delete(uri, Playlists.Members.AUDIO_ID + "=" + id, null); } else if (mPlaylistId == PLAYLIST_QUEUE) { MusicUtils.removeTrack(id); reloadQueueCursor(); } else if (mPlaylistId == PLAYLIST_FAVORITES) { MusicUtils.removeFromFavorites(getActivity(), id); } mListView.invalidateViews(); } private class TracksAdapter extends SimpleCursorAdapter { private TracksAdapter(Context context, int layout, Cursor cursor, String[] from, int[] to, int flags) { super(context, layout, cursor, from, to, flags); } @Override public void bindView(View view, Context context, Cursor cursor) { ViewHolder viewholder = (ViewHolder) view.getTag(); String track_name = cursor.getString(mTrackIdx); viewholder.track_name.setText(track_name); String artist_name = cursor.getString(mArtistIdx); if (artist_name == null || MediaStore.UNKNOWN_STRING.equals(artist_name)) { viewholder.artist_name.setText(R.string.unknown_artist); } else { viewholder.artist_name.setText(artist_name); } long secs = cursor.getLong(mDurationIdx) / 1000; if (secs <= 0) { viewholder.track_duration.setText(""); } else { viewholder.track_duration.setText(MusicUtils.makeTimeString(context, secs)); } long audio_id = cursor.getLong(mIdIdx); long currentaudioid = MusicUtils.getCurrentAudioId(); if (currentaudioid == audio_id) { viewholder.track_name.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_indicator_nowplaying_small, 0); } else { viewholder.track_name.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0); } } @Override public View newView(Context context, Cursor cursor, ViewGroup parent) { View view = super.newView(context, cursor, parent); ViewHolder viewholder = new ViewHolder(view); view.setTag(viewholder); return view; } private class ViewHolder { TextView track_name; TextView artist_name; TextView track_duration; public ViewHolder(View view) { track_name = (TextView) view.findViewById(R.id.name); artist_name = (TextView) view.findViewById(R.id.summary); track_duration = (TextView) view.findViewById(R.id.duration); } } } }