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.apis.app;
18 
19 import android.app.Activity;
20 import android.content.Context;
21 import android.content.Intent;
22 import android.provider.Settings;
23 import android.view.ActionProvider;
24 import android.view.LayoutInflater;
25 import android.view.Menu;
26 import android.view.MenuItem;
27 import android.view.View;
28 import android.widget.ImageButton;
29 import android.widget.Toast;
30 
31 import com.example.android.apis.R;
32 
33 /**
34  * This activity demonstrates how to implement an {@link android.view.ActionProvider}
35  * for adding functionality to the Action Bar. In particular this demo creates an
36  * ActionProvider for launching the system settings and adds a menu item with that
37  * provider.
38  */
39 public class ActionBarSettingsActionProviderActivity extends Activity {
40 
41     /**
42      * {@inheritDoc}
43      */
44     @Override
onCreateOptionsMenu(Menu menu)45     public boolean onCreateOptionsMenu(Menu menu) {
46         super.onCreateOptionsMenu(menu);
47         getMenuInflater().inflate(R.menu.action_bar_settings_action_provider, menu);
48         return true;
49     }
50 
51     /**
52      * {@inheritDoc}
53      */
54     @Override
onOptionsItemSelected(MenuItem item)55     public boolean onOptionsItemSelected(MenuItem item) {
56         // If this callback does not handle the item click, onPerformDefaultAction
57         // of the ActionProvider is invoked. Hence, the provider encapsulates the
58         // complete functionality of the menu item.
59         Toast.makeText(this, R.string.action_bar_settings_action_provider_no_handling,
60                 Toast.LENGTH_SHORT).show();
61         return false;
62     }
63 
64     public static class SettingsActionProvider extends ActionProvider {
65 
66         /** An intent for launching the system settings. */
67         private static final Intent sSettingsIntent = new Intent(Settings.ACTION_SETTINGS);
68 
69         /** Context for accessing resources. */
70         private final Context mContext;
71 
72         /**
73          * Creates a new instance.
74          *
75          * @param context Context for accessing resources.
76          */
SettingsActionProvider(Context context)77         public SettingsActionProvider(Context context) {
78             super(context);
79             mContext = context;
80         }
81 
82         /**
83          * {@inheritDoc}
84          */
85         @Override
onCreateActionView()86         public View onCreateActionView() {
87             // Inflate the action view to be shown on the action bar.
88             LayoutInflater layoutInflater = LayoutInflater.from(mContext);
89             View view = layoutInflater.inflate(R.layout.action_bar_settings_action_provider, null);
90             ImageButton button = (ImageButton) view.findViewById(R.id.button);
91             // Attach a click listener for launching the system settings.
92             button.setOnClickListener(new View.OnClickListener() {
93                 @Override
94                 public void onClick(View v) {
95                     mContext.startActivity(sSettingsIntent);
96                 }
97             });
98             return view;
99         }
100 
101         /**
102          * {@inheritDoc}
103          */
104         @Override
onPerformDefaultAction()105         public boolean onPerformDefaultAction() {
106             // This is called if the host menu item placed in the overflow menu of the
107             // action bar is clicked and the host activity did not handle the click.
108             mContext.startActivity(sSettingsIntent);
109             return true;
110         }
111     }
112 }
113