| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.example.android.supportv4.app; |
| |
| import android.database.Cursor; |
| import android.net.Uri; |
| import android.os.Bundle; |
| import android.provider.Contacts.People; |
| import android.support.v4.app.FragmentActivity; |
| import android.support.v4.app.FragmentManager; |
| import android.support.v4.app.ListFragment; |
| import android.support.v4.app.LoaderManager; |
| import android.support.v4.content.CursorLoader; |
| import android.support.v4.content.Loader; |
| import android.support.v4.widget.SimpleCursorAdapter; |
| import android.text.TextUtils; |
| import android.util.Log; |
| import android.view.Menu; |
| import android.view.MenuInflater; |
| import android.view.MenuItem; |
| import android.view.View; |
| import android.widget.ListView; |
| import android.widget.SearchView; |
| |
| /** |
| * Demonstration of the use of a CursorLoader to load and display contacts |
| * data in a fragment. |
| */ |
| @SuppressWarnings("all") |
| public class LoaderCursorSupport extends FragmentActivity { |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| |
| FragmentManager fm = getSupportFragmentManager(); |
| |
| // Create the list fragment and add it as our sole content. |
| if (fm.findFragmentById(android.R.id.content) == null) { |
| CursorLoaderListFragment list = new CursorLoaderListFragment(); |
| fm.beginTransaction().add(android.R.id.content, list).commit(); |
| } |
| } |
| |
| //BEGIN_INCLUDE(fragment_cursor) |
| public static class CursorLoaderListFragment extends ListFragment |
| implements LoaderManager.LoaderCallbacks<Cursor> { |
| |
| // This is the Adapter being used to display the list's data. |
| SimpleCursorAdapter mAdapter; |
| |
| // If non-null, this is the current filter the user has provided. |
| String mCurFilter; |
| |
| @Override public void onActivityCreated(Bundle savedInstanceState) { |
| super.onActivityCreated(savedInstanceState); |
| |
| // Give some text to display if there is no data. In a real |
| // application this would come from a resource. |
| setEmptyText("No phone numbers"); |
| |
| // We have a menu item to show in action bar. |
| setHasOptionsMenu(true); |
| |
| // Create an empty adapter we will use to display the loaded data. |
| mAdapter = new SimpleCursorAdapter(getActivity(), |
| android.R.layout.simple_list_item_1, null, |
| new String[] { People.DISPLAY_NAME }, |
| new int[] { android.R.id.text1}, 0); |
| 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); |
| } |
| |
| @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { |
| // Place an action bar item for searching. |
| MenuItem item = menu.add("Search"); |
| item.setIcon(android.R.drawable.ic_menu_search); |
| item.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS |
| | MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW); |
| final SearchView searchView = new SearchView(getActivity()); |
| searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() { |
| @Override |
| 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. |
| String newFilter = !TextUtils.isEmpty(newText) ? newText : null; |
| // Don't do anything if the filter hasn't actually changed. |
| // Prevents restarting the loader when restoring state. |
| if (mCurFilter == null && newFilter == null) { |
| return true; |
| } |
| if (mCurFilter != null && mCurFilter.equals(newFilter)) { |
| return true; |
| } |
| mCurFilter = newFilter; |
| getLoaderManager().restartLoader(0, null, CursorLoaderListFragment.this); |
| return true; |
| } |
| |
| @Override |
| public boolean onQueryTextSubmit(String s) { |
| return false; |
| } |
| }); |
| searchView.setOnCloseListener(new SearchView.OnCloseListener() { |
| @Override |
| public boolean onClose() { |
| if (!TextUtils.isEmpty(searchView.getQuery())) { |
| searchView.setQuery(null, true); |
| } |
| return true; |
| } |
| }); |
| item.setActionView(searchView); |
| } |
| |
| @Override public void onListItemClick(ListView l, View v, int position, long id) { |
| // Insert desired behavior here. |
| Log.i("FragmentComplexList", "Item clicked: " + id); |
| } |
| |
| // These are the Contacts rows that we will retrieve. |
| static final String[] CONTACTS_SUMMARY_PROJECTION = new String[] { |
| People._ID, |
| People.DISPLAY_NAME, |
| }; |
| |
| 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 (mCurFilter != null) { |
| baseUri = Uri.withAppendedPath(People.CONTENT_FILTER_URI, Uri.encode(mCurFilter)); |
| } else { |
| baseUri = People.CONTENT_URI; |
| } |
| |
| // Now create and return a CursorLoader that will take care of |
| // creating a Cursor for the data being displayed. |
| String select = "((" + People.DISPLAY_NAME + " NOTNULL) AND (" |
| + People.DISPLAY_NAME + " != '' ))"; |
| return new CursorLoader(getActivity(), baseUri, |
| CONTACTS_SUMMARY_PROJECTION, select, null, |
| People.DISPLAY_NAME + " COLLATE LOCALIZED ASC"); |
| } |
| |
| public void onLoadFinished(Loader<Cursor> loader, Cursor data) { |
| // 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); |
| } |
| } |
| //END_INCLUDE(fragment_cursor) |
| } |