| /* |
| * Copyright (C) 2012 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except |
| * in compliance with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software distributed under the License |
| * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express |
| * or implied. See the License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| |
| package com.example.android.networkusage; |
| |
| import android.content.SharedPreferences; |
| import android.content.SharedPreferences.OnSharedPreferenceChangeListener; |
| import android.os.Bundle; |
| import android.preference.PreferenceActivity; |
| import com.example.android.networkusage.R; |
| |
| /** |
| * This preference activity has in its manifest declaration an intent filter for |
| * the ACTION_MANAGE_NETWORK_USAGE action. This activity provides a settings UI |
| * for users to specify network settings to control data usage. |
| */ |
| public class SettingsActivity extends PreferenceActivity |
| implements |
| OnSharedPreferenceChangeListener { |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| |
| // Loads the XML preferences file. |
| addPreferencesFromResource(R.xml.preferences); |
| } |
| |
| @Override |
| protected void onResume() { |
| super.onResume(); |
| |
| // Registers a callback to be invoked whenever a user changes a preference. |
| getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this); |
| } |
| |
| @Override |
| protected void onPause() { |
| super.onPause(); |
| |
| // Unregisters the listener set in onResume(). |
| // It's best practice to unregister listeners when your app isn't using them to cut down on |
| // unnecessary system overhead. You do this in onPause(). |
| getPreferenceScreen() |
| .getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this); |
| } |
| |
| // Fires when the user changes a preference. |
| @Override |
| public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) { |
| // Sets refreshDisplay to true so that when the user returns to the main |
| // activity, the display refreshes to reflect the new settings. |
| NetworkActivity.refreshDisplay = true; |
| } |
| } |