Java tutorial
/* * Copyright (C) 2017 Team Gateship-One * (Hendrik Borghorst & Frederik Luetkes) * * The AUTHORS.md file contains a detailed contributors list: * <https://github.com/gateship-one/malp/blob/master/AUTHORS.md> * * 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.malp.application.fragments.serverfragments; import android.content.Context; import android.content.SharedPreferences; import android.graphics.Bitmap; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.content.Loader; import android.support.v4.widget.SwipeRefreshLayout; 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.AbsListView; import android.widget.AdapterView; import android.widget.GridView; import android.widget.ListView; import java.util.List; import org.gateshipone.malp.R; import org.gateshipone.malp.application.adapters.ArtistsAdapter; import org.gateshipone.malp.application.artworkdatabase.ArtworkManager; import org.gateshipone.malp.application.callbacks.FABFragmentCallback; import org.gateshipone.malp.application.loaders.ArtistsLoader; import org.gateshipone.malp.application.utils.CoverBitmapLoader; import org.gateshipone.malp.application.utils.ScrollSpeedListener; import org.gateshipone.malp.application.utils.ThemeUtils; import org.gateshipone.malp.mpdservice.handlers.serverhandler.MPDQueryHandler; import org.gateshipone.malp.mpdservice.mpdprotocol.mpdobjects.MPDArtist; public class ArtistsFragment extends GenericMPDFragment<List<MPDArtist>> implements AdapterView.OnItemClickListener { public final static String TAG = ArtistsFragment.class.getSimpleName(); /** * GridView adapter object used for this GridView */ private ArtistsAdapter mArtistAdapter; /** * Save the root GridView for later usage. */ private AbsListView mAdapterView; /** * Save the last position here. Gets reused when the user returns to this view after selecting sme * albums. */ private int mLastPosition = -1; private ArtistSelectedCallback mSelectedCallback; private FABFragmentCallback mFABCallback = null; private boolean mUseList = false; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(getContext()); String libraryView = sharedPref.getString(getString(R.string.pref_library_view_key), getString(R.string.pref_library_view_default)); if (libraryView.equals(getString(R.string.pref_library_view_list_key))) { mUseList = true; } else { mUseList = false; } View rootView; // get gridview if (mUseList) { rootView = inflater.inflate(R.layout.listview_layout_refreshable, container, false); mAdapterView = (ListView) rootView.findViewById(R.id.main_listview); } else { // Inflate the layout for this fragment rootView = inflater.inflate(R.layout.fragment_gridview, container, false); mAdapterView = (GridView) rootView.findViewById(R.id.grid_refresh_gridview); } mArtistAdapter = new ArtistsAdapter(getActivity(), mAdapterView, mUseList); mAdapterView.setAdapter(mArtistAdapter); mAdapterView.setOnItemClickListener(this); mAdapterView.setOnScrollListener(new ScrollSpeedListener(mArtistAdapter, mAdapterView)); // register for context menu registerForContextMenu(mAdapterView); // get swipe layout mSwipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.refresh_layout); // set swipe colors mSwipeRefreshLayout.setColorSchemeColors(ThemeUtils.getThemeColor(getContext(), R.attr.colorAccent), ThemeUtils.getThemeColor(getContext(), R.attr.colorPrimary)); // set swipe refresh listener mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { refreshContent(); } }); return rootView; } @Override public void onResume() { super.onResume(); if (null != mFABCallback) { mFABCallback.setupFAB(false, null); mFABCallback.setupToolbar(getString(R.string.app_name), true, true, false); } ArtworkManager.getInstance(getContext().getApplicationContext()) .registerOnNewArtistImageListener((ArtistsAdapter) mArtistAdapter); } @Override public void onPause() { super.onPause(); ArtworkManager.getInstance(getContext().getApplicationContext()) .unregisterOnNewArtistImageListener((ArtistsAdapter) mArtistAdapter); } /** * 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 { mSelectedCallback = (ArtistSelectedCallback) context; } catch (ClassCastException e) { throw new ClassCastException(context.toString() + " must implement OnArtistSelectedListener"); } // This makes sure that the container activity has implemented // the callback interface. If not, it throws an exception try { mFABCallback = (FABFragmentCallback) context; } catch (ClassCastException e) { mFABCallback = null; } } /** * This method creates a new loader for this fragment. * * @param id * @param args * @return */ @Override public Loader<List<MPDArtist>> onCreateLoader(int id, Bundle args) { // Read albumartists/artists preference SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(getContext()); boolean useAlbumArtists = sharedPref.getBoolean(getString(R.string.pref_use_album_artists_key), getResources().getBoolean(R.bool.pref_use_album_artists_default)); return new ArtistsLoader(getActivity(), useAlbumArtists); } /** * 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<MPDArtist>> loader, List<MPDArtist> data) { super.onLoadFinished(loader, data); // Set the actual data to the adapter. mArtistAdapter.swapModel(data); // Reset old scroll position if (mLastPosition >= 0) { mAdapterView.setSelection(mLastPosition); mLastPosition = -1; } } /** * If a loader is reset the model data should be cleared. * * @param loader Loader that was resetted. */ @Override public void onLoaderReset(Loader<List<MPDArtist>> loader) { // Clear the model data of the adapter. mArtistAdapter.swapModel(null); } /** * 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_artist, 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.fragment_artist_action_enqueue: enqueueArtist(info.position); return true; case R.id.fragment_artist_action_play: playArtist(info.position); return true; default: return super.onContextItemSelected(item); } } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { mLastPosition = position; MPDArtist artist = (MPDArtist) mArtistAdapter.getItem(position); mSelectedCallback.onArtistSelected(artist); } public interface ArtistSelectedCallback { void onArtistSelected(MPDArtist artistname); } private void enqueueArtist(int index) { MPDArtist artist = (MPDArtist) mArtistAdapter.getItem(index); MPDQueryHandler.addArtist(artist.getArtistName()); } private void playArtist(int index) { MPDArtist artist = (MPDArtist) mArtistAdapter.getItem(index); MPDQueryHandler.playArtist(artist.getArtistName()); } public void applyFilter(String name) { mArtistAdapter.applyFilter(name); } public void removeFilter() { mArtistAdapter.removeFilter(); } }