Java tutorial
/* * Copyright (C) 2005-2015 Team XBMC * http://xbmc.org * * 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, 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 XBMC Remote; see the file license. If not, write to * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. * http://www.gnu.org/copyleft/gpl.html * */ package org.xbmc.android.remotesandbox.ui; import android.content.Context; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.provider.BaseColumns; import android.provider.ContactsContract.Contacts; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.support.v4.widget.CursorAdapter; import android.text.TextUtils; import android.util.Log; import android.view.View; import android.view.ViewGroup; import android.widget.ListView; import android.widget.TextView; import org.xbmc.android.jsonrpc.provider.AudioContract; import org.xbmc.android.jsonrpc.provider.AudioDatabase.Tables; import org.xbmc.android.jsonrpc.service.AudioSyncService; import org.xbmc.android.remotesandbox.R; public class AlbumsFragment extends ReloadableListFragment implements LoaderManager.LoaderCallbacks<Cursor> { private static final String TAG = AlbumsFragment.class.getSimpleName(); // This is the Adapter being used to display the list's data. private CursorAdapter mAdapter; // If non-null, this is the current filter the user has provided. private String mCurrentFilter; private final AudioSyncService.RefreshObserver mRefreshObserver = new AudioSyncService.RefreshObserver() { @Override public void onRefreshed() { Log.d(TAG, "Refreshing Albums from database."); getLoaderManager().restartLoader(0, null, AlbumsFragment.this); } }; @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); // Give some text to display if there is no data. setEmptyText(getResources().getString(R.string.empty_albums)); // Create an empty adapter we will use to display the loaded data. mAdapter = new AlbumsAdapter(getActivity()); setListAdapter(mAdapter); // Start out with a progress indicator. setListShown(false); // Prepare the loader. Either re-connect with an existing one, // or start a new one. getLoaderManager().initLoader(0, null, this); } public boolean onQueryTextChange(String newText) { // Called when the action bar search text has changed. Update // the search filter, and restart the loader to do a new query // with this filter. mCurrentFilter = !TextUtils.isEmpty(newText) ? newText : null; getLoaderManager().restartLoader(0, null, this); return true; } @Override public void onListItemClick(ListView l, View v, int position, long id) { // Insert desired behavior here. Log.i("FragmentComplexList", "Item clicked: " + id); } public Loader<Cursor> onCreateLoader(int id, Bundle args) { // This is called when a new Loader needs to be created. This // sample only has one Loader, so we don't care about the ID. // First, pick the base URI to use depending on whether we are // currently filtering. Uri baseUri; if (mCurrentFilter != null) { baseUri = Uri.withAppendedPath(Contacts.CONTENT_FILTER_URI, Uri.encode(mCurrentFilter)); } else { baseUri = Contacts.CONTENT_URI; } return new CursorLoader(getActivity(), AudioContract.Albums.CONTENT_URI, AlbumsQuery.PROJECTION, null, null, AudioContract.Albums.DEFAULT_SORT); } public void onLoadFinished(Loader<Cursor> loader, Cursor data) { // see: http://stackoverflow.com/questions/6757156/android-cursorloader-crash-on-non-topmost-fragment if (!isVisible()) { return; } // Swap the new cursor in. (The framework will take care of closing the // old cursor once we return.) mAdapter.swapCursor(data); // The list should now be shown. if (isResumed()) { setListShown(true); } else { setListShownNoAnimation(true); } } public void onLoaderReset(Loader<Cursor> loader) { // This is called when the last Cursor provided to onLoadFinished() // above is about to be closed. We need to make sure we are no // longer using it. mAdapter.swapCursor(null); } @Override public void onResume() { super.onResume(); if (getActivity() instanceof BaseFragmentTabsActivity) { ((BaseFragmentTabsActivity) getActivity()).registerRefreshObserver(mRefreshObserver); } getLoaderManager().restartLoader(0, null, this); } @Override public void onPause() { super.onPause(); if (getActivity() instanceof BaseFragmentTabsActivity) { ((BaseFragmentTabsActivity) getActivity()).unregisterRefreshObserver(mRefreshObserver); } } /** * {@link CursorAdapter} that renders a {@link AlbumsQuery}. */ private class AlbumsAdapter extends CursorAdapter { public AlbumsAdapter(Context context) { super(context, null, false); } /** {@inheritDoc} */ @Override public View newView(Context context, Cursor cursor, ViewGroup parent) { return getActivity().getLayoutInflater().inflate(R.layout.list_item_threelabels, parent, false); } /** {@inheritDoc} */ @Override public void bindView(View view, Context context, Cursor cursor) { final TextView titleView = (TextView) view.findViewById(R.id.item_title); final TextView subtitleView = (TextView) view.findViewById(R.id.item_subtitle); final TextView subsubtitleView = (TextView) view.findViewById(R.id.item_subsubtitle); titleView.setText(cursor.getString(AlbumsQuery.TITLE)); subtitleView.setText(cursor.getString(AlbumsQuery.ARTIST)); subsubtitleView.setText(cursor.getString(AlbumsQuery.YEAR)); } } /** * {@link org.xbmc.android.jsonrpc.provider.AudioContract.Albums} * query parameters. */ private interface AlbumsQuery { // int _TOKEN = 0x1; String[] PROJECTION = { Tables.ALBUMS + "." + BaseColumns._ID, AudioContract.Albums.ID, AudioContract.Albums.TITLE, AudioContract.Albums.YEAR, AudioContract.Artists.NAME }; // int _ID = 0; // int ID = 1; int TITLE = 2; int YEAR = 3; int ARTIST = 4; } }