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 package com.example.android.apis.app;
17 
18 import android.app.Activity;
19 import android.os.Bundle;
20 import android.view.Menu;
21 import android.view.MenuItem;
22 import android.view.Window;
23 import android.widget.Toast;
24 
25 /**
26  * This demonstrates the basics of the Action Bar and how it interoperates with the
27  * standard options menu. This demo is for informative purposes only; see ActionBarUsage for
28  * an example of using the Action Bar in a more idiomatic manner.
29  */
30 public class ActionBarMechanics extends Activity {
31     @Override
onCreate(Bundle savedInstanceState)32     protected void onCreate(Bundle savedInstanceState) {
33         super.onCreate(savedInstanceState);
34 
35         // The Action Bar is a window feature. The feature must be requested
36         // before setting a content view. Normally this is set automatically
37         // by your Activity's theme in your manifest. The provided system
38         // theme Theme.WithActionBar enables this for you. Use it as you would
39         // use Theme.NoTitleBar. You can add an Action Bar to your own themes
40         // by adding the element <item name="android:windowActionBar">true</item>
41         // to your style definition.
42         getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
43     }
44 
45     @Override
onCreateOptionsMenu(Menu menu)46     public boolean onCreateOptionsMenu(Menu menu) {
47         // Menu items default to never show in the action bar. On most devices this means
48         // they will show in the standard options menu panel when the menu button is pressed.
49         // On xlarge-screen devices a "More" button will appear in the far right of the
50         // Action Bar that will display remaining items in a cascading menu.
51         menu.add("Normal item");
52 
53         MenuItem actionItem = menu.add("Action Button");
54 
55         // Items that show as actions should favor the "if room" setting, which will
56         // prevent too many buttons from crowding the bar. Extra items will show in the
57         // overflow area.
58         actionItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
59 
60         // Items that show as actions are strongly encouraged to use an icon.
61         // These icons are shown without a text description, and therefore should
62         // be sufficiently descriptive on their own.
63         actionItem.setIcon(android.R.drawable.ic_menu_share);
64 
65         return true;
66     }
67 
68     @Override
onOptionsItemSelected(MenuItem item)69     public boolean onOptionsItemSelected(MenuItem item) {
70         Toast.makeText(this, "Selected Item: " + item.getTitle(), Toast.LENGTH_SHORT).show();
71         return true;
72     }
73 }
74