| /* |
| * Copyright (C) 2019 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.android.settings.network; |
| |
| import android.content.Context; |
| import android.provider.Settings; |
| import android.telephony.SubscriptionManager; |
| |
| /** Helper class to listen for changes in the enabled state of mobile data. */ |
| public class MobileDataEnabledListener { |
| private Context mContext; |
| private Client mClient; |
| private int mSubId; |
| |
| // There're 2 listeners both activated at the same time. |
| // For project that access MOBILE_DATA, only first listener is functional. |
| // For project that access "MOBILE_DATA + subId", first listener will be stopped when receiving |
| // any onChange from second listener. |
| |
| private GlobalSettingsChangeListener mListener; |
| private GlobalSettingsChangeListener mListenerForSubId; |
| |
| public interface Client { |
| void onMobileDataEnabledChange(); |
| } |
| |
| /** |
| * Constructor |
| * |
| * @param context of this listener |
| * @param client callback when configuration changed |
| */ |
| public MobileDataEnabledListener(Context context, Client client) { |
| mContext = context; |
| mClient = client; |
| mSubId = SubscriptionManager.INVALID_SUBSCRIPTION_ID; |
| } |
| |
| /** |
| * Starts listening to changes in the enabled state for data on the given subscription id. |
| * |
| * @param subId subscription id for enabled state of data subscription |
| */ |
| public void start(int subId) { |
| mSubId = subId; |
| |
| if (mListener == null) { |
| mListener = new GlobalSettingsChangeListener(mContext, |
| Settings.Global.MOBILE_DATA) { |
| public void onChanged(String field) { |
| mClient.onMobileDataEnabledChange(); |
| } |
| }; |
| } |
| stopMonitorSubIdSpecific(); |
| |
| if (mSubId == SubscriptionManager.INVALID_SUBSCRIPTION_ID) { |
| return; |
| } |
| |
| mListenerForSubId = new GlobalSettingsChangeListener(mContext, |
| Settings.Global.MOBILE_DATA + mSubId) { |
| public void onChanged(String field) { |
| stopMonitor(); |
| mClient.onMobileDataEnabledChange(); |
| } |
| }; |
| } |
| |
| /** |
| * Get latest subscription id configured for listening |
| * |
| * @return subscription id |
| */ |
| public int getSubId() { |
| return mSubId; |
| } |
| |
| /** |
| * Stop listening to changes in the enabled state for data. |
| */ |
| public void stop() { |
| stopMonitor(); |
| stopMonitorSubIdSpecific(); |
| } |
| |
| private void stopMonitor() { |
| if (mListener != null) { |
| mListener.close(); |
| mListener = null; |
| } |
| } |
| |
| private void stopMonitorSubIdSpecific() { |
| if (mListenerForSubId != null) { |
| mListenerForSubId.close(); |
| mListenerForSubId = null; |
| } |
| } |
| } |