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      1 /*
      2  * Copyright (C) 2011 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.supportv13.app;
     18 
     19 import android.app.ListFragment;
     20 import android.app.LoaderManager;
     21 import android.content.CursorLoader;
     22 import android.content.Loader;
     23 import android.database.Cursor;
     24 import android.net.Uri;
     25 import android.os.Bundle;
     26 import android.provider.ContactsContract.Contacts;
     27 import android.text.TextUtils;
     28 import android.util.Log;
     29 import android.view.Menu;
     30 import android.view.MenuInflater;
     31 import android.view.MenuItem;
     32 import android.view.View;
     33 import android.widget.ListView;
     34 import android.widget.SearchView;
     35 import android.widget.SearchView.OnQueryTextListener;
     36 import android.widget.SimpleCursorAdapter;
     37 
     38 
     39 public class CursorFragment extends ListFragment
     40         implements OnQueryTextListener, LoaderManager.LoaderCallbacks<Cursor> {
     41 
     42     // This is the Adapter being used to display the list's data.
     43     SimpleCursorAdapter mAdapter;
     44 
     45     // If non-null, this is the current filter the user has provided.
     46     String mCurFilter;
     47 
     48     @Override public void onActivityCreated(Bundle savedInstanceState) {
     49         super.onActivityCreated(savedInstanceState);
     50 
     51         // Give some text to display if there is no data.  In a real
     52         // application this would come from a resource.
     53         setEmptyText("No phone numbers");
     54 
     55         // We have a menu item to show in action bar.
     56         setHasOptionsMenu(true);
     57 
     58         // Create an empty adapter we will use to display the loaded data.
     59         mAdapter = new SimpleCursorAdapter(getActivity(),
     60                 android.R.layout.simple_list_item_2, null,
     61                 new String[] { Contacts.DISPLAY_NAME, Contacts.CONTACT_STATUS },
     62                 new int[] { android.R.id.text1, android.R.id.text2 }, 0);
     63         setListAdapter(mAdapter);
     64 
     65         // Start out with a progress indicator.
     66         setListShown(false);
     67 
     68         // Prepare the loader.  Either re-connect with an existing one,
     69         // or start a new one.
     70         getLoaderManager().initLoader(0, null, this);
     71     }
     72 
     73     @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
     74         // Place an action bar item for searching.
     75         MenuItem item = menu.add("Search");
     76         item.setIcon(android.R.drawable.ic_menu_search);
     77         item.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM
     78                 | MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW);
     79         SearchView sv = new SearchView(getActivity());
     80         sv.setOnQueryTextListener(this);
     81         item.setActionView(sv);
     82     }
     83 
     84     @Override
     85     public boolean onQueryTextChange(String newText) {
     86         // Called when the action bar search text has changed.  Update
     87         // the search filter, and restart the loader to do a new query
     88         // with this filter.
     89         mCurFilter = !TextUtils.isEmpty(newText) ? newText : null;
     90         getLoaderManager().restartLoader(0, null, this);
     91         return true;
     92     }
     93 
     94     @Override public boolean onQueryTextSubmit(String query) {
     95         // Don't care about this.
     96         return true;
     97     }
     98 
     99     @Override public void onListItemClick(ListView l, View v, int position, long id) {
    100         // Insert desired behavior here.
    101         Log.i("FragmentComplexList", "Item clicked: " + id);
    102     }
    103 
    104     // These are the Contacts rows that we will retrieve.
    105     static final String[] CONTACTS_SUMMARY_PROJECTION = new String[] {
    106         Contacts._ID,
    107         Contacts.DISPLAY_NAME,
    108         Contacts.CONTACT_STATUS,
    109         Contacts.CONTACT_PRESENCE,
    110         Contacts.PHOTO_ID,
    111         Contacts.LOOKUP_KEY,
    112     };
    113 
    114     @Override
    115     public Loader<Cursor> onCreateLoader(int id, Bundle args) {
    116         // This is called when a new Loader needs to be created.  This
    117         // sample only has one Loader, so we don't care about the ID.
    118         // First, pick the base URI to use depending on whether we are
    119         // currently filtering.
    120         Uri baseUri;
    121         if (mCurFilter != null) {
    122             baseUri = Uri.withAppendedPath(Contacts.CONTENT_FILTER_URI,
    123                     Uri.encode(mCurFilter));
    124         } else {
    125             baseUri = Contacts.CONTENT_URI;
    126         }
    127 
    128         // Now create and return a CursorLoader that will take care of
    129         // creating a Cursor for the data being displayed.
    130         String select = "((" + Contacts.DISPLAY_NAME + " NOTNULL) AND ("
    131                 + Contacts.HAS_PHONE_NUMBER + "=1) AND ("
    132                 + Contacts.DISPLAY_NAME + " != '' ))";
    133         return new CursorLoader(getActivity(), baseUri,
    134                 CONTACTS_SUMMARY_PROJECTION, select, null,
    135                 Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC");
    136     }
    137 
    138     @Override
    139     public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
    140         // Swap the new cursor in.  (The framework will take care of closing the
    141         // old cursor once we return.)
    142         mAdapter.swapCursor(data);
    143 
    144         // The list should now be shown.
    145         if (isResumed()) {
    146             setListShown(true);
    147         } else {
    148             setListShownNoAnimation(true);
    149         }
    150     }
    151 
    152     @Override
    153     public void onLoaderReset(Loader<Cursor> loader) {
    154         // This is called when the last Cursor provided to onLoadFinished()
    155         // above is about to be closed.  We need to make sure we are no
    156         // longer using it.
    157         mAdapter.swapCursor(null);
    158     }
    159 }
    160