Java tutorial
/* * Copyright (c) 2015 David Schulte * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package de.arcus.playmusicexporter2.fragments; import android.net.Uri; import android.os.Bundle; import android.support.design.widget.FloatingActionButton; import android.support.v4.app.Fragment; import android.text.TextUtils; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import de.arcus.playmusicexporter2.R; import de.arcus.playmusicexporter2.activities.MusicContainerListActivity; import de.arcus.playmusicexporter2.activities.MusicTrackListActivity; import de.arcus.playmusicexporter2.adapter.MusicTrackListAdapter; import de.arcus.playmusicexporter2.items.SelectedTrack; import de.arcus.playmusicexporter2.items.SelectedTrackList; import de.arcus.playmusicexporter2.settings.PlayMusicExporterSettings; import de.arcus.playmusicexporter2.utils.ArtworkViewLoader; import de.arcus.playmusicexporter2.utils.MusicPathBuilder; import de.arcus.playmusiclib.PlayMusicManager; import de.arcus.playmusiclib.items.MusicTrack; import de.arcus.playmusiclib.items.MusicTrackList; /** * A fragment representing a single Track detail screen. * This fragment is either contained in a {@link MusicContainerListActivity} * in two-pane mode (on tablets) or a {@link MusicTrackListActivity} * on handsets. */ public class MusicTrackListFragment extends Fragment { /** * The fragment argument representing the item ID that this fragment * represents. */ public static final String ARG_MUSIC_TRACK_LIST_ID = "music_track_list_id"; public static final String ARG_MUSIC_TRACK_LIST_TYPE = "music_track_list_type"; /** * The track list */ private MusicTrackList mMusicTrackList; /** * The list view */ private ListView mListView; private FloatingActionButton mFloatingButtonExport; private MusicTrackListAdapter mMusicTrackAdapter; /** * Mandatory empty constructor for the fragment manager to instantiate the * fragment (e.g. upon screen orientation changes). */ public MusicTrackListFragment() { } /** * Update the list view */ public void updateListView() { if (mListView != null) mListView.invalidateViews(); updateFloatingButton(); } /** * Update the floating button */ public void updateFloatingButton() { if (SelectedTrackList.getInstance().getSelectedItems().size() > 0) { mFloatingButtonExport.show(); } else { mFloatingButtonExport.hide(); } } /** * Select all items */ public void selectAll() { // Select all tracks for (int i = 0; i < mMusicTrackAdapter.getCount(); i++) { MusicTrack musicTrack = mMusicTrackAdapter.getItem(i); selectTrack(musicTrack, null, TrackSelectionState.Select); } updateListView(); } /** * Deselect all items */ public void deselectAll() { // Deselect all tracks for (int i = 0; i < mMusicTrackAdapter.getCount(); i++) { MusicTrack musicTrack = mMusicTrackAdapter.getItem(i); selectTrack(musicTrack, null, TrackSelectionState.Deselect); } updateListView(); } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (getArguments().containsKey(ARG_MUSIC_TRACK_LIST_ID) && getArguments().containsKey(ARG_MUSIC_TRACK_LIST_TYPE)) { // Loads the track list long id = getArguments().getLong(ARG_MUSIC_TRACK_LIST_ID); String type = getArguments().getString(ARG_MUSIC_TRACK_LIST_TYPE); PlayMusicManager playMusicManager = PlayMusicManager.getInstance(); if (playMusicManager != null) { mMusicTrackList = MusicTrackList.deserialize(playMusicManager, id, type); } } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_track_detail, container, false); // Show the dummy content as text in a TextView. if (mMusicTrackList != null) { mListView = (ListView) rootView.findViewById(R.id.list_music_track); mMusicTrackAdapter = new MusicTrackListAdapter(getActivity()); mMusicTrackAdapter.setShowArtworks(mMusicTrackList.getShowArtworkInTrack()); View headerView = inflater.inflate(R.layout.header_music_track_list, mListView, false); headerView.setEnabled(false); TextView textView; ImageView imageView; // Sets the artwork image imageView = (ImageView) headerView.findViewById(R.id.image_music_track_artwork); // Loads the artwork ArtworkViewLoader.loadImage(mMusicTrackList, imageView, R.drawable.cd_case); // Sets the title textView = (TextView) headerView.findViewById(R.id.text_music_track_list_title); textView.setText(mMusicTrackList.getTitle()); // Sets the description textView = (TextView) headerView.findViewById(R.id.text_music_track_list_description); textView.setText(mMusicTrackList.getDescription()); mListView.addHeaderView(headerView); mMusicTrackAdapter.setList(mMusicTrackList.getMusicTrackList()); mListView.setAdapter(mMusicTrackAdapter); // Click on one list item mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // The header is not clicked if (position > 0) { // We need to subtract the header view position -= 1; // Gets the selected track MusicTrack musicTrack = mMusicTrackAdapter.getItem(position); // Toggle the track selectTrack(musicTrack, view, TrackSelectionState.Toggle); } } }); // The floating action button mFloatingButtonExport = (FloatingActionButton) rootView.findViewById(R.id.floating_button_export); mFloatingButtonExport.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // Export all selected tracks for (SelectedTrack selectedTrack : SelectedTrackList.getInstance().getSelectedItems()) { selectedTrack.export(getActivity()); } // Clear the selection SelectedTrackList.getInstance().clear(true); } }); updateFloatingButton(); } return rootView; } private enum TrackSelectionState { Deselect, Select, Toggle } /** * Select a track * @param musicTrack The track * @param view The view * @param state Selection state */ private void selectTrack(MusicTrack musicTrack, View view, TrackSelectionState state) { // Track is available if (musicTrack.isOfflineAvailable()) { // Gets the settings PlayMusicExporterSettings settings = new PlayMusicExporterSettings(getActivity()); // Default structure String pathStructure = "{album-artist} - {title}.mp3"; // Track is exported from a group (playlist or artist) if (!TextUtils.isEmpty(musicTrack.getContainerName())) { pathStructure = "{group}/{album-artist} - {title}.mp3"; } // Build the path String path = MusicPathBuilder.Build(musicTrack, pathStructure); // Gets the root uri Uri uri = settings.getUri(PlayMusicExporterSettings.PREF_EXPORT_URI, Uri.EMPTY); // Prevent the closing SelectedTrackList.getInstance().setDoNotCloseActionMode(true); switch (state) { case Select: SelectedTrackList.getInstance().setSelected(new SelectedTrack(musicTrack.getId(), uri, path), true, view); break; case Deselect: SelectedTrackList.getInstance().setSelected(new SelectedTrack(musicTrack.getId(), uri, path), false, view); break; case Toggle: SelectedTrackList.getInstance().toggle(new SelectedTrack(musicTrack.getId(), uri, path), view); break; } SelectedTrackList.getInstance().setDoNotCloseActionMode(false); } else { if (state == TrackSelectionState.Toggle) { // Show an info message for offline tracks Toast toast = Toast.makeText(getActivity(), R.string.toast_error_track_not_offline, Toast.LENGTH_LONG); toast.show(); } } updateFloatingButton(); } }