ConnectivityManagerCompat.java revision 5d79c2b6211936177817f2492816c1dba76dac3e 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.support.v4.net;
18
19import static android.net.ConnectivityManager.TYPE_MOBILE;
20import static android.net.ConnectivityManager.TYPE_WIFI;
21
22import android.net.ConnectivityManager;
23import android.net.NetworkInfo;
24import android.os.Build;
25
26/**
27 * Helper for accessing features in {@link ConnectivityManager} introduced after
28 * API level 16 in a backwards compatible fashion.
29 */
30public class ConnectivityManagerCompat {
31
32    interface ConnectivityManagerCompatImpl {
33        boolean isActiveNetworkMetered(ConnectivityManager cm);
34    }
35
36    static class BaseConnectivityManagerCompatImpl implements ConnectivityManagerCompatImpl {
37        @Override
38        public boolean isActiveNetworkMetered(ConnectivityManager cm) {
39            final NetworkInfo info = cm.getActiveNetworkInfo();
40            if (info == null) {
41                // err on side of caution
42                return true;
43            }
44
45            final int type = info.getType();
46            switch (type) {
47                case TYPE_MOBILE:
48                    return true;
49                case TYPE_WIFI:
50                    return false;
51                default:
52                    // err on side of caution
53                    return true;
54            }
55        }
56    }
57
58    static class GingerbreadConnectivityManagerCompatImpl implements ConnectivityManagerCompatImpl {
59        @Override
60        public boolean isActiveNetworkMetered(ConnectivityManager cm) {
61            return ConnectivityManagerCompatGingerbread.isActiveNetworkMetered(cm);
62        }
63    }
64
65    static class HoneycombMR2ConnectivityManagerCompatImpl
66            implements ConnectivityManagerCompatImpl {
67        @Override
68        public boolean isActiveNetworkMetered(ConnectivityManager cm) {
69            return ConnectivityManagerCompatHoneycombMR2.isActiveNetworkMetered(cm);
70        }
71    }
72
73    static class JellyBeanConnectivityManagerCompatImpl implements ConnectivityManagerCompatImpl {
74        @Override
75        public boolean isActiveNetworkMetered(ConnectivityManager cm) {
76            return ConnectivityManagerCompatJellyBean.isActiveNetworkMetered(cm);
77        }
78    }
79
80    private static final ConnectivityManagerCompatImpl IMPL;
81
82    static {
83        if (Build.VERSION.SDK_INT >= 16) {
84            IMPL = new JellyBeanConnectivityManagerCompatImpl();
85        } else if (Build.VERSION.SDK_INT >= 13) {
86            IMPL = new HoneycombMR2ConnectivityManagerCompatImpl();
87        } else if (Build.VERSION.SDK_INT >= 8) {
88            IMPL = new GingerbreadConnectivityManagerCompatImpl();
89        } else {
90            IMPL = new BaseConnectivityManagerCompatImpl();
91        }
92    }
93
94    /**
95     * Returns if the currently active data network is metered. A network is
96     * classified as metered when the user is sensitive to heavy data usage on
97     * that connection. You should check this before doing large data transfers,
98     * and warn the user or delay the operation until another network is
99     * available.
100     */
101    public boolean isActiveNetworkMetered(ConnectivityManager cm) {
102        return IMPL.isActiveNetworkMetered(cm);
103    }
104}
105