Java tutorial
/* * Copyright (C) 2016 Hendrik Borghorst & Frederik Luetkes * * 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 3 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, see <http://www.gnu.org/licenses/>. * */ package org.gateshipone.odyssey.fragments; import android.content.Context; import android.os.RemoteException; import android.provider.MediaStore; import android.os.Bundle; import android.support.v4.content.Loader; import android.view.ContextMenu; import android.view.LayoutInflater; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ListView; import org.gateshipone.odyssey.R; import org.gateshipone.odyssey.adapter.SavedPlaylistsAdapter; import org.gateshipone.odyssey.listener.OnPlaylistSelectedListener; import org.gateshipone.odyssey.loaders.PlaylistLoader; import org.gateshipone.odyssey.models.PlaylistModel; import org.gateshipone.odyssey.utils.PermissionHelper; import java.util.List; public class SavedPlaylistsFragment extends OdysseyFragment<PlaylistModel> implements AdapterView.OnItemClickListener { /** * Listener to open a playlist */ private OnPlaylistSelectedListener mPlaylistSelectedCallback; /** * Save the root ListView for later usage. */ private ListView mRootListView; /** * Save the last scroll position to resume there */ private int mLastPosition = -1; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment View rootView = inflater.inflate(R.layout.list_linear, container, false); // get listview mRootListView = (ListView) rootView.findViewById(R.id.list_linear_listview); mAdapter = new SavedPlaylistsAdapter(getActivity()); mRootListView.setAdapter(mAdapter); mRootListView.setOnItemClickListener(this); // register for context menu registerForContextMenu(mRootListView); return rootView; } /** * Called when the fragment is first attached to its context. */ @Override public void onAttach(Context context) { super.onAttach(context); // This makes sure that the container activity has implemented // the callback interface. If not, it throws an exception try { mPlaylistSelectedCallback = (OnPlaylistSelectedListener) context; } catch (ClassCastException e) { throw new ClassCastException(context.toString() + " must implement OnPlaylistSelectedListener"); } } /** * Called when the fragment resumes. * Reload the data and create the PBS connection. */ @Override public void onResume() { super.onResume(); if (mToolbarAndFABCallback != null) { // set toolbar behaviour and title mToolbarAndFABCallback.setupToolbar(getString(R.string.fragment_title_saved_playlists), false, true, false); // set up play button mToolbarAndFABCallback.setupFAB(null); } } @Override public Loader<List<PlaylistModel>> onCreateLoader(int arg0, Bundle bundle) { return new PlaylistLoader(getActivity(), false); } /** * Called when the loader finished loading its data. * * @param loader The used loader itself * @param data Data of the loader */ @Override public void onLoadFinished(Loader<List<PlaylistModel>> loader, List<PlaylistModel> data) { super.onLoadFinished(loader, data); // Reset old scroll position if (mLastPosition >= 0) { mRootListView.setSelection(mLastPosition); mLastPosition = -1; } } /** * Callback when an item in the ListView was clicked. */ @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // Save scroll position mLastPosition = position; // identify current playlist PlaylistModel clickedPlaylist = (PlaylistModel) mAdapter.getItem(position); String playlistName = clickedPlaylist.getPlaylistName(); long playlistID = clickedPlaylist.getPlaylistID(); // open playlistfragment mPlaylistSelectedCallback.onPlaylistSelected(playlistName, playlistID); } /** * Create the context menu. */ @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); MenuInflater inflater = getActivity().getMenuInflater(); inflater.inflate(R.menu.context_menu_saved_playlists_fragment, menu); } /** * Hook called when an menu item in the context menu is selected. * * @param item The menu item that was selected. * @return True if the hook was consumed here. */ @Override public boolean onContextItemSelected(MenuItem item) { AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo(); if (info == null) { return super.onContextItemSelected(item); } switch (item.getItemId()) { case R.id.saved_playlists_context_menu_action_play: playPlaylist(info.position); return true; case R.id.saved_playlists_context_menu_action_enqueue: enqueuePlaylist(info.position); return true; case R.id.saved_playlists_context_menu_action_delete: deletePlaylist(info.position); return true; default: return super.onContextItemSelected(item); } } /** * Call the PBS to enqueue the selected playlist. * @param position the position of the selected playlist in the adapter */ private void enqueuePlaylist(int position) { // identify current playlist PlaylistModel clickedPlaylist = (PlaylistModel) mAdapter.getItem(position); try { // add playlist mServiceConnection.getPBS().enqueuePlaylist(clickedPlaylist.getPlaylistID()); } catch (RemoteException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * Call the PBS to play the selected playlist. * @param position the position of the selected playlist in the adapter */ private void playPlaylist(int position) { // identify current playlist PlaylistModel clickedPlaylist = (PlaylistModel) mAdapter.getItem(position); try { // clear the playlist mServiceConnection.getPBS().clearPlaylist(); // add playlist mServiceConnection.getPBS().enqueuePlaylist(clickedPlaylist.getPlaylistID()); // start playback mServiceConnection.getPBS().jumpTo(0); } catch (RemoteException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * Remove the selected playlist from the mediastore. * @param position the position of the selected playlist in the adapter */ private void deletePlaylist(int position) { // identify current playlist PlaylistModel clickedPlaylist = (PlaylistModel) mAdapter.getItem(position); // delete current playlist String where = MediaStore.Audio.Playlists._ID + "=?"; String[] whereVal = { "" + clickedPlaylist.getPlaylistID() }; PermissionHelper.delete(getActivity(), MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI, where, whereVal); // reload data getLoaderManager().restartLoader(0, getArguments(), this); } }