src/com/android/car/settings/network/NetworkUtils.java

/*
 * 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.car.settings.network;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.Network;
import android.net.NetworkCapabilities;
import android.telephony.SubscriptionInfo;
import android.telephony.SubscriptionManager;
import android.telephony.TelephonyManager;

import java.util.List;

/** Provides helpful utilities surrounding network related tasks. */
public final class NetworkUtils {

    private NetworkUtils() {
    }

    /** Returns {@code true} if device has a mobile network. */
    public static boolean hasMobileNetwork(ConnectivityManager connectivityManager) {
        Network[] networks = connectivityManager.getAllNetworks();
        for (Network network : networks) {
            NetworkCapabilities capabilities = connectivityManager.getNetworkCapabilities(network);
            if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                return true;
            }
        }
        return false;
    }

    /** Returns {@code true} if device has a sim card. */
    public static boolean hasSim(TelephonyManager telephonyManager) {
        int simState = telephonyManager.getSimState();

        // Note that pulling out the SIM card returns UNKNOWN, not ABSENT.
        return simState != TelephonyManager.SIM_STATE_ABSENT
                && simState != TelephonyManager.SIM_STATE_UNKNOWN;
    }

    /**
     * Sets the mobile data enabled state based on {@code enabled} for the subscription defined by
     * {@code subId}. If {@code disableOtherSubscriptions} is set, other subscriptions will be
     * disabled unless they are opportunistic.
     */
    public static void setMobileDataEnabled(Context context, int subId, boolean enabled,
            boolean disableOtherSubscriptions) {
        TelephonyManager telephonyManager = context.getSystemService(TelephonyManager.class)
                .createForSubscriptionId(subId);
        SubscriptionManager subscriptionManager = context.getSystemService(
                SubscriptionManager.class);
        telephonyManager.setDataEnabled(enabled);

        if (disableOtherSubscriptions) {
            List<SubscriptionInfo> subInfoList =
                    subscriptionManager.getActiveSubscriptionInfoList();
            if (subInfoList != null) {
                for (SubscriptionInfo subInfo : subInfoList) {
                    // We never disable mobile data for opportunistic subscriptions.
                    if (subInfo.getSubscriptionId() != subId && !subInfo.isOpportunistic()) {
                        context.getSystemService(TelephonyManager.class).createForSubscriptionId(
                                subInfo.getSubscriptionId()).setDataEnabled(false);
                    }
                }
            }
        }
    }
}