1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5 * in compliance with the License. You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the License
10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11 * or implied. See the License for the specific language governing permissions and limitations under
12 * the License.
13 */
14
15package com.example.android.networkusage;
16
17import android.content.SharedPreferences;
18import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
19import android.os.Bundle;
20import android.preference.PreferenceActivity;
21import com.example.android.networkusage.R;
22
23/**
24 * This preference activity has in its manifest declaration an intent filter for
25 * the ACTION_MANAGE_NETWORK_USAGE action. This activity provides a settings UI
26 * for users to specify network settings to control data usage.
27 */
28public class SettingsActivity extends PreferenceActivity
29        implements
30            OnSharedPreferenceChangeListener {
31
32    @Override
33    protected void onCreate(Bundle savedInstanceState) {
34        super.onCreate(savedInstanceState);
35
36        // Loads the XML preferences file.
37        addPreferencesFromResource(R.xml.preferences);
38    }
39
40    @Override
41    protected void onResume() {
42        super.onResume();
43
44        // Registers a callback to be invoked whenever a user changes a preference.
45        getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
46    }
47
48    @Override
49    protected void onPause() {
50        super.onPause();
51
52        // Unregisters the listener set in onResume().
53        // It's best practice to unregister listeners when your app isn't using them to cut down on
54        // unnecessary system overhead. You do this in onPause().
55        getPreferenceScreen()
56                .getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
57    }
58
59    // Fires when the user changes a preference.
60    @Override
61    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
62        // Sets refreshDisplay to true so that when the user returns to the main
63        // activity, the display refreshes to reflect the new settings.
64        NetworkActivity.refreshDisplay = true;
65    }
66}
67