Katie McCormick | 2f8cc17 | 2012-03-16 17:47:55 -0700 | [diff] [blame] | 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 | |
| 15 | package com.example.android.networkusage; |
| 16 | |
| 17 | import android.content.SharedPreferences; |
| 18 | import android.content.SharedPreferences.OnSharedPreferenceChangeListener; |
| 19 | import android.os.Bundle; |
| 20 | import android.preference.PreferenceActivity; |
| 21 | import 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 | */ |
| 28 | public 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 | } |