WifiEnabler.java revision b1c0e0b1c93acbc71a2063411ae4ac86f9fc9fbf 
1/*
2 * Copyright (C) 2010 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 com.android.settings.wifi;
18
19import android.content.BroadcastReceiver;
20import android.content.Context;
21import android.content.Intent;
22import android.content.IntentFilter;
23import android.net.NetworkInfo;
24import android.net.wifi.SupplicantState;
25import android.net.wifi.WifiInfo;
26import android.net.wifi.WifiManager;
27import android.provider.Settings;
28import android.widget.CompoundButton;
29import android.widget.Switch;
30import android.widget.Toast;
31
32import com.android.settings.R;
33import com.android.settings.WirelessSettings;
34
35import java.util.concurrent.atomic.AtomicBoolean;
36
37public class WifiEnabler implements CompoundButton.OnCheckedChangeListener  {
38    private final Context mContext;
39    private Switch mSwitch;
40    private AtomicBoolean mConnected = new AtomicBoolean(false);
41
42    private final WifiManager mWifiManager;
43    private boolean mStateMachineEvent;
44    private final IntentFilter mIntentFilter;
45    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
46        @Override
47        public void onReceive(Context context, Intent intent) {
48            String action = intent.getAction();
49            if (WifiManager.WIFI_STATE_CHANGED_ACTION.equals(action)) {
50                handleWifiStateChanged(intent.getIntExtra(
51                        WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_UNKNOWN));
52            } else if (WifiManager.SUPPLICANT_STATE_CHANGED_ACTION.equals(action)) {
53                if (!mConnected.get()) {
54                    handleStateChanged(WifiInfo.getDetailedStateOf((SupplicantState)
55                            intent.getParcelableExtra(WifiManager.EXTRA_NEW_STATE)));
56                }
57            } else if (WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(action)) {
58                NetworkInfo info = (NetworkInfo) intent.getParcelableExtra(
59                        WifiManager.EXTRA_NETWORK_INFO);
60                mConnected.set(info.isConnected());
61                handleStateChanged(info.getDetailedState());
62            }
63        }
64    };
65
66    public WifiEnabler(Context context, Switch switch_) {
67        mContext = context;
68        mSwitch = switch_;
69
70        mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
71        mIntentFilter = new IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION);
72        // The order matters! We really should not depend on this. :(
73        mIntentFilter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION);
74        mIntentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
75    }
76
77    public void resume() {
78        // Wi-Fi state is sticky, so just let the receiver update UI
79        mContext.registerReceiver(mReceiver, mIntentFilter);
80        mSwitch.setOnCheckedChangeListener(this);
81    }
82
83    public void pause() {
84        mContext.unregisterReceiver(mReceiver);
85        mSwitch.setOnCheckedChangeListener(null);
86    }
87
88    public void setSwitch(Switch switch_) {
89        if (mSwitch == switch_) return;
90        mSwitch.setOnCheckedChangeListener(null);
91        mSwitch = switch_;
92        mSwitch.setOnCheckedChangeListener(this);
93
94        final int wifiState = mWifiManager.getWifiState();
95        boolean isEnabled = wifiState == WifiManager.WIFI_STATE_ENABLED;
96        boolean isDisabled = wifiState == WifiManager.WIFI_STATE_DISABLED;
97        mSwitch.setChecked(isEnabled);
98        mSwitch.setEnabled(isEnabled || isDisabled);
99    }
100
101    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
102        //Do nothing if called as a result of a state machine event
103        if (mStateMachineEvent) {
104            return;
105        }
106        // Show toast message if Wi-Fi is not allowed in airplane mode
107        if (isChecked && !WirelessSettings.isRadioAllowed(mContext, Settings.System.RADIO_WIFI)) {
108            Toast.makeText(mContext, R.string.wifi_in_airplane_mode, Toast.LENGTH_SHORT).show();
109            // Reset switch to off. No infinite check/listenenr loop.
110            buttonView.setChecked(false);
111        }
112
113        // Disable tethering if enabling Wifi
114        int wifiApState = mWifiManager.getWifiApState();
115        if (isChecked && ((wifiApState == WifiManager.WIFI_AP_STATE_ENABLING) ||
116                (wifiApState == WifiManager.WIFI_AP_STATE_ENABLED))) {
117            mWifiManager.setWifiApEnabled(null, false);
118        }
119
120        if (mWifiManager.setWifiEnabled(isChecked)) {
121            // Intent has been taken into account, disable until new state is active
122            mSwitch.setEnabled(false);
123        } else {
124            // Error
125            Toast.makeText(mContext, R.string.wifi_error, Toast.LENGTH_SHORT).show();
126        }
127    }
128
129    private void handleWifiStateChanged(int state) {
130        switch (state) {
131            case WifiManager.WIFI_STATE_ENABLING:
132                mSwitch.setEnabled(false);
133                break;
134            case WifiManager.WIFI_STATE_ENABLED:
135                setSwitchChecked(true);
136                mSwitch.setEnabled(true);
137                break;
138            case WifiManager.WIFI_STATE_DISABLING:
139                mSwitch.setEnabled(false);
140                break;
141            case WifiManager.WIFI_STATE_DISABLED:
142                setSwitchChecked(false);
143                mSwitch.setEnabled(true);
144                break;
145            default:
146                setSwitchChecked(false);
147                mSwitch.setEnabled(true);
148                break;
149        }
150    }
151
152    private void setSwitchChecked(boolean checked) {
153        if (checked != mSwitch.isChecked()) {
154            mStateMachineEvent = true;
155            mSwitch.setChecked(checked);
156            mStateMachineEvent = false;
157        }
158    }
159
160    private void handleStateChanged(@SuppressWarnings("unused") NetworkInfo.DetailedState state) {
161        // After the refactoring from a CheckBoxPreference to a Switch, this method is useless since
162        // there is nowhere to display a summary.
163        // This code is kept in case a future change re-introduces an associated text.
164        /*
165        // WifiInfo is valid if and only if Wi-Fi is enabled.
166        // Here we use the state of the switch as an optimization.
167        if (state != null && mSwitch.isChecked()) {
168            WifiInfo info = mWifiManager.getConnectionInfo();
169            if (info != null) {
170                //setSummary(Summary.get(mContext, info.getSSID(), state));
171            }
172        }
173        */
174    }
175}
176