1 /* 2 * Copyright (C) 2007 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.notepad; 18 19 import android.app.ListActivity; 20 import android.content.ComponentName; 21 import android.content.ContentUris; 22 import android.content.Intent; 23 import android.database.Cursor; 24 import android.net.Uri; 25 import android.os.Bundle; 26 import android.util.Log; 27 import android.view.ContextMenu; 28 import android.view.Menu; 29 import android.view.MenuInflater; 30 import android.view.MenuItem; 31 import android.view.View; 32 import android.view.ContextMenu.ContextMenuInfo; 33 import android.widget.AdapterView; 34 import android.widget.ListView; 35 import android.widget.SimpleCursorAdapter; 36 37 import com.example.android.notepad.NotePad.NoteColumns; 38 39 /** 40 * Displays a list of notes. Will display notes from the {@link Uri} 41 * provided in the intent if there is one, otherwise defaults to displaying the 42 * contents of the {@link NoteProvider} 43 */ 44 public class NotesList extends ListActivity { 45 private static final String TAG = "NotesList"; 46 47 /** 48 * The columns we are interested in from the database 49 */ 50 private static final String[] PROJECTION = new String[] { 51 NoteColumns._ID, // 0 52 NoteColumns.TITLE, // 1 53 }; 54 55 /** The index of the title column */ 56 private static final int COLUMN_INDEX_TITLE = 1; 57 58 @Override 59 protected void onCreate(Bundle savedInstanceState) { 60 super.onCreate(savedInstanceState); 61 62 setDefaultKeyMode(DEFAULT_KEYS_SHORTCUT); 63 64 // If no data was given in the intent (because we were started 65 // as a MAIN activity), then use our default content provider. 66 Intent intent = getIntent(); 67 if (intent.getData() == null) { 68 intent.setData(NoteColumns.CONTENT_URI); 69 } 70 71 // Inform the list we provide context menus for items 72 getListView().setOnCreateContextMenuListener(this); 73 74 // Perform a managed query. The Activity will handle closing and requerying the cursor 75 // when needed. 76 Cursor cursor = managedQuery(getIntent().getData(), PROJECTION, null, null, 77 NoteColumns.DEFAULT_SORT_ORDER); 78 79 // Used to map notes entries from the database to views 80 SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.noteslist_item, cursor, 81 new String[] { NoteColumns.TITLE }, new int[] { android.R.id.text1 }); 82 setListAdapter(adapter); 83 } 84 85 @Override 86 public boolean onCreateOptionsMenu(Menu menu) { 87 // Inflate menu from XML resource 88 MenuInflater inflater = getMenuInflater(); 89 inflater.inflate(R.menu.list_options_menu, menu); 90 91 // Generate any additional actions that can be performed on the 92 // overall list. In a normal install, there are no additional 93 // actions found here, but this allows other applications to extend 94 // our menu with their own actions. 95 Intent intent = new Intent(null, getIntent().getData()); 96 intent.addCategory(Intent.CATEGORY_ALTERNATIVE); 97 menu.addIntentOptions(Menu.CATEGORY_ALTERNATIVE, 0, 0, 98 new ComponentName(this, NotesList.class), null, intent, 0, null); 99 100 return super.onCreateOptionsMenu(menu); 101 } 102 103 @Override 104 public boolean onOptionsItemSelected(MenuItem item) { 105 switch (item.getItemId()) { 106 case R.id.menu_add: 107 // Launch activity to insert a new item 108 startActivity(new Intent(Intent.ACTION_INSERT, getIntent().getData())); 109 return true; 110 default: 111 return super.onOptionsItemSelected(item); 112 } 113 } 114 115 @Override 116 public void onCreateContextMenu(ContextMenu menu, View view, ContextMenuInfo menuInfo) { 117 AdapterView.AdapterContextMenuInfo info; 118 try { 119 info = (AdapterView.AdapterContextMenuInfo) menuInfo; 120 } catch (ClassCastException e) { 121 Log.e(TAG, "bad menuInfo", e); 122 return; 123 } 124 125 Cursor cursor = (Cursor) getListAdapter().getItem(info.position); 126 if (cursor == null) { 127 // For some reason the requested item isn't available, do nothing 128 return; 129 } 130 131 // Inflate menu from XML resource 132 MenuInflater inflater = getMenuInflater(); 133 inflater.inflate(R.menu.list_context_menu, menu); 134 135 // Set the context menu header 136 menu.setHeaderTitle(cursor.getString(COLUMN_INDEX_TITLE)); 137 138 // Append to the 139 // menu items for any other activities that can do stuff with it 140 // as well. This does a query on the system for any activities that 141 // implement the ALTERNATIVE_ACTION for our data, adding a menu item 142 // for each one that is found. 143 Intent intent = new Intent(null, Uri.withAppendedPath(getIntent().getData(), 144 Integer.toString((int) info.id) )); 145 intent.addCategory(Intent.CATEGORY_ALTERNATIVE); 146 menu.addIntentOptions(Menu.CATEGORY_ALTERNATIVE, 0, 0, 147 new ComponentName(this, NotesList.class), null, intent, 0, null); 148 } 149 150 @Override 151 public boolean onContextItemSelected(MenuItem item) { 152 AdapterView.AdapterContextMenuInfo info; 153 try { 154 info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo(); 155 } catch (ClassCastException e) { 156 Log.e(TAG, "bad menuInfo", e); 157 return false; 158 } 159 160 Uri noteUri = ContentUris.withAppendedId(getIntent().getData(), info.id); 161 162 switch (item.getItemId()) { 163 case R.id.context_open: 164 // Launch activity to view/edit the currently selected item 165 startActivity(new Intent(Intent.ACTION_EDIT, noteUri)); 166 return true; 167 case R.id.context_delete: 168 // Delete the note that the context menu is for 169 getContentResolver().delete(noteUri, null, null); 170 return true; 171 default: 172 return super.onContextItemSelected(item); 173 } 174 } 175 176 @Override 177 protected void onListItemClick(ListView l, View v, int position, long id) { 178 Uri noteUri = ContentUris.withAppendedId(getIntent().getData(), id); 179 180 String action = getIntent().getAction(); 181 if (Intent.ACTION_PICK.equals(action) || Intent.ACTION_GET_CONTENT.equals(action)) { 182 // The caller is waiting for us to return a note selected by 183 // the user. The have clicked on one, so return it now. 184 setResult(RESULT_OK, new Intent().setData(noteUri)); 185 } else { 186 // Launch activity to view/edit the currently selected item 187 startActivity(new Intent(Intent.ACTION_EDIT, noteUri)); 188 } 189 } 190 } 191
