| /* |
| * 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 android.support.v4.net; |
| |
| import static android.net.ConnectivityManager.TYPE_MOBILE; |
| import static android.net.ConnectivityManager.TYPE_WIFI; |
| |
| import android.content.Intent; |
| import android.net.ConnectivityManager; |
| import android.net.NetworkInfo; |
| import android.os.Build; |
| |
| /** |
| * Helper for accessing features in {@link ConnectivityManager} introduced after |
| * API level 16 in a backwards compatible fashion. |
| */ |
| public class ConnectivityManagerCompat { |
| |
| interface ConnectivityManagerCompatImpl { |
| boolean isActiveNetworkMetered(ConnectivityManager cm); |
| } |
| |
| static class BaseConnectivityManagerCompatImpl implements ConnectivityManagerCompatImpl { |
| @Override |
| public boolean isActiveNetworkMetered(ConnectivityManager cm) { |
| final NetworkInfo info = cm.getActiveNetworkInfo(); |
| if (info == null) { |
| // err on side of caution |
| return true; |
| } |
| |
| final int type = info.getType(); |
| switch (type) { |
| case TYPE_MOBILE: |
| return true; |
| case TYPE_WIFI: |
| return false; |
| default: |
| // err on side of caution |
| return true; |
| } |
| } |
| } |
| |
| static class GingerbreadConnectivityManagerCompatImpl implements ConnectivityManagerCompatImpl { |
| @Override |
| public boolean isActiveNetworkMetered(ConnectivityManager cm) { |
| return ConnectivityManagerCompatGingerbread.isActiveNetworkMetered(cm); |
| } |
| } |
| |
| static class HoneycombMR2ConnectivityManagerCompatImpl |
| implements ConnectivityManagerCompatImpl { |
| @Override |
| public boolean isActiveNetworkMetered(ConnectivityManager cm) { |
| return ConnectivityManagerCompatHoneycombMR2.isActiveNetworkMetered(cm); |
| } |
| } |
| |
| static class JellyBeanConnectivityManagerCompatImpl implements ConnectivityManagerCompatImpl { |
| @Override |
| public boolean isActiveNetworkMetered(ConnectivityManager cm) { |
| return ConnectivityManagerCompatJellyBean.isActiveNetworkMetered(cm); |
| } |
| } |
| |
| private static final ConnectivityManagerCompatImpl IMPL; |
| |
| static { |
| if (Build.VERSION.SDK_INT >= 16) { |
| IMPL = new JellyBeanConnectivityManagerCompatImpl(); |
| } else if (Build.VERSION.SDK_INT >= 13) { |
| IMPL = new HoneycombMR2ConnectivityManagerCompatImpl(); |
| } else if (Build.VERSION.SDK_INT >= 8) { |
| IMPL = new GingerbreadConnectivityManagerCompatImpl(); |
| } else { |
| IMPL = new BaseConnectivityManagerCompatImpl(); |
| } |
| } |
| |
| /** |
| * Returns if the currently active data network is metered. A network is |
| * classified as metered when the user is sensitive to heavy data usage on |
| * that connection. You should check this before doing large data transfers, |
| * and warn the user or delay the operation until another network is |
| * available. |
| */ |
| public static boolean isActiveNetworkMetered(ConnectivityManager cm) { |
| return IMPL.isActiveNetworkMetered(cm); |
| } |
| |
| /** |
| * Return the {@link NetworkInfo} that caused the given |
| * {@link ConnectivityManager#CONNECTIVITY_ACTION} broadcast. This obtains |
| * the current state from {@link ConnectivityManager} instead of using the |
| * potentially-stale value from |
| * {@link ConnectivityManager#EXTRA_NETWORK_INFO}. May be {@code null}. |
| */ |
| public static NetworkInfo getNetworkInfoFromBroadcast(ConnectivityManager cm, Intent intent) { |
| final NetworkInfo info = intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO); |
| if (info != null) { |
| return cm.getNetworkInfo(info.getType()); |
| } else { |
| return null; |
| } |
| } |
| } |