1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.example.android.supportv4.app; 18 19 import android.support.v4.app.FragmentActivity; 20 import android.support.v4.app.FragmentManager; 21 import android.support.v4.app.ListFragment; 22 import android.support.v4.app.LoaderManager; 23 import android.support.v4.content.CursorLoader; 24 import android.support.v4.content.Loader; 25 import android.support.v4.view.MenuItemCompat; 26 import android.support.v4.widget.SearchViewCompat; 27 import android.support.v4.widget.SearchViewCompat.OnCloseListenerCompat; 28 import android.support.v4.widget.SearchViewCompat.OnQueryTextListenerCompat; 29 import android.support.v4.widget.SimpleCursorAdapter; 30 31 import android.database.Cursor; 32 import android.net.Uri; 33 import android.os.Bundle; 34 import android.provider.BaseColumns; 35 import android.provider.Contacts.People; 36 import android.text.TextUtils; 37 import android.util.Log; 38 import android.view.Menu; 39 import android.view.MenuInflater; 40 import android.view.MenuItem; 41 import android.view.View; 42 import android.widget.ListView; 43 44 /** 45 * Demonstration of the use of a CursorLoader to load and display contacts 46 * data in a fragment. 47 */ 48 @SuppressWarnings("all") 49 public class LoaderCursorSupport extends FragmentActivity { 50 51 @Override 52 protected void onCreate(Bundle savedInstanceState) { 53 super.onCreate(savedInstanceState); 54 55 FragmentManager fm = getSupportFragmentManager(); 56 57 // Create the list fragment and add it as our sole content. 58 if (fm.findFragmentById(android.R.id.content) == null) { 59 CursorLoaderListFragment list = new CursorLoaderListFragment(); 60 fm.beginTransaction().add(android.R.id.content, list).commit(); 61 } 62 } 63 64 //BEGIN_INCLUDE(fragment_cursor) 65 public static class CursorLoaderListFragment extends ListFragment 66 implements LoaderManager.LoaderCallbacks<Cursor> { 67 68 // This is the Adapter being used to display the list's data. 69 SimpleCursorAdapter mAdapter; 70 71 // If non-null, this is the current filter the user has provided. 72 String mCurFilter; 73 74 @Override public void onActivityCreated(Bundle savedInstanceState) { 75 super.onActivityCreated(savedInstanceState); 76 77 // Give some text to display if there is no data. In a real 78 // application this would come from a resource. 79 setEmptyText("No phone numbers"); 80 81 // We have a menu item to show in action bar. 82 setHasOptionsMenu(true); 83 84 // Create an empty adapter we will use to display the loaded data. 85 mAdapter = new SimpleCursorAdapter(getActivity(), 86 android.R.layout.simple_list_item_1, null, 87 new String[] { People.DISPLAY_NAME }, 88 new int[] { android.R.id.text1}, 0); 89 setListAdapter(mAdapter); 90 91 // Start out with a progress indicator. 92 setListShown(false); 93 94 // Prepare the loader. Either re-connect with an existing one, 95 // or start a new one. 96 getLoaderManager().initLoader(0, null, this); 97 } 98 99 @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 100 // Place an action bar item for searching. 101 MenuItem item = menu.add("Search"); 102 item.setIcon(android.R.drawable.ic_menu_search); 103 MenuItemCompat.setShowAsAction(item, MenuItemCompat.SHOW_AS_ACTION_ALWAYS 104 | MenuItemCompat.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW); 105 final View searchView = SearchViewCompat.newSearchView(getActivity()); 106 if (searchView != null) { 107 SearchViewCompat.setOnQueryTextListener(searchView, 108 new OnQueryTextListenerCompat() { 109 @Override 110 public boolean onQueryTextChange(String newText) { 111 // Called when the action bar search text has changed. Update 112 // the search filter, and restart the loader to do a new query 113 // with this filter. 114 String newFilter = !TextUtils.isEmpty(newText) ? newText : null; 115 // Don't do anything if the filter hasn't actually changed. 116 // Prevents restarting the loader when restoring state. 117 if (mCurFilter == null && newFilter == null) { 118 return true; 119 } 120 if (mCurFilter != null && mCurFilter.equals(newFilter)) { 121 return true; 122 } 123 mCurFilter = newFilter; 124 getLoaderManager().restartLoader(0, null, CursorLoaderListFragment.this); 125 return true; 126 } 127 }); 128 SearchViewCompat.setOnCloseListener(searchView, 129 new OnCloseListenerCompat() { 130 @Override 131 public boolean onClose() { 132 if (!TextUtils.isEmpty(SearchViewCompat.getQuery(searchView))) { 133 SearchViewCompat.setQuery(searchView, null, true); 134 } 135 return true; 136 } 137 138 }); 139 MenuItemCompat.setActionView(item, searchView); 140 } 141 } 142 143 @Override public void onListItemClick(ListView l, View v, int position, long id) { 144 // Insert desired behavior here. 145 Log.i("FragmentComplexList", "Item clicked: " + id); 146 } 147 148 // These are the Contacts rows that we will retrieve. 149 static final String[] CONTACTS_SUMMARY_PROJECTION = new String[] { 150 People._ID, 151 People.DISPLAY_NAME, 152 }; 153 154 public Loader<Cursor> onCreateLoader(int id, Bundle args) { 155 // This is called when a new Loader needs to be created. This 156 // sample only has one Loader, so we don't care about the ID. 157 // First, pick the base URI to use depending on whether we are 158 // currently filtering. 159 Uri baseUri; 160 if (mCurFilter != null) { 161 baseUri = Uri.withAppendedPath(People.CONTENT_FILTER_URI, Uri.encode(mCurFilter)); 162 } else { 163 baseUri = People.CONTENT_URI; 164 } 165 166 // Now create and return a CursorLoader that will take care of 167 // creating a Cursor for the data being displayed. 168 String select = "((" + People.DISPLAY_NAME + " NOTNULL) AND (" 169 + People.DISPLAY_NAME + " != '' ))"; 170 return new CursorLoader(getActivity(), baseUri, 171 CONTACTS_SUMMARY_PROJECTION, select, null, 172 People.DISPLAY_NAME + " COLLATE LOCALIZED ASC"); 173 } 174 175 public void onLoadFinished(Loader<Cursor> loader, Cursor data) { 176 // Swap the new cursor in. (The framework will take care of closing the 177 // old cursor once we return.) 178 mAdapter.swapCursor(data); 179 180 // The list should now be shown. 181 if (isResumed()) { 182 setListShown(true); 183 } else { 184 setListShownNoAnimation(true); 185 } 186 } 187 188 public void onLoaderReset(Loader<Cursor> loader) { 189 // This is called when the last Cursor provided to onLoadFinished() 190 // above is about to be closed. We need to make sure we are no 191 // longer using it. 192 mAdapter.swapCursor(null); 193 } 194 } 195 //END_INCLUDE(fragment_cursor) 196 } 197
