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 
17 package com.android.settings.wifi;
18 
19 import android.app.settings.SettingsEnums;
20 import android.content.BroadcastReceiver;
21 import android.content.Context;
22 import android.content.Intent;
23 import android.content.IntentFilter;
24 import android.net.ConnectivityManager;
25 import android.net.NetworkInfo;
26 import android.net.wifi.SupplicantState;
27 import android.net.wifi.WifiInfo;
28 import android.net.wifi.WifiManager;
29 import android.provider.Settings;
30 import android.widget.Toast;
31 
32 import androidx.annotation.VisibleForTesting;
33 
34 import com.android.settings.R;
35 import com.android.settings.widget.SwitchWidgetController;
36 import com.android.settingslib.WirelessUtils;
37 import com.android.settingslib.core.instrumentation.MetricsFeatureProvider;
38 
39 import java.util.concurrent.atomic.AtomicBoolean;
40 
41 public class WifiEnabler implements SwitchWidgetController.OnSwitchChangeListener  {
42 
43     private final SwitchWidgetController mSwitchWidget;
44     private final WifiManager mWifiManager;
45     private final ConnectivityManager mConnectivityManager;
46     private final MetricsFeatureProvider mMetricsFeatureProvider;
47 
48     private Context mContext;
49     private boolean mListeningToOnSwitchChange = false;
50     private AtomicBoolean mConnected = new AtomicBoolean(false);
51 
52 
53     private boolean mStateMachineEvent;
54     private final IntentFilter mIntentFilter;
55     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
56         @Override
57         public void onReceive(Context context, Intent intent) {
58             String action = intent.getAction();
59             if (WifiManager.WIFI_STATE_CHANGED_ACTION.equals(action)) {
60                 handleWifiStateChanged(mWifiManager.getWifiState());
61             } else if (WifiManager.SUPPLICANT_STATE_CHANGED_ACTION.equals(action)) {
62                 if (!mConnected.get()) {
63                     handleStateChanged(WifiInfo.getDetailedStateOf((SupplicantState)
64                             intent.getParcelableExtra(WifiManager.EXTRA_NEW_STATE)));
65                 }
66             } else if (WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(action)) {
67                 NetworkInfo info = (NetworkInfo) intent.getParcelableExtra(
68                         WifiManager.EXTRA_NETWORK_INFO);
69                 mConnected.set(info.isConnected());
70                 handleStateChanged(info.getDetailedState());
71             }
72         }
73     };
74 
WifiEnabler(Context context, SwitchWidgetController switchWidget, MetricsFeatureProvider metricsFeatureProvider)75     public WifiEnabler(Context context, SwitchWidgetController switchWidget,
76         MetricsFeatureProvider metricsFeatureProvider) {
77         this(context, switchWidget, metricsFeatureProvider,
78             (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE));
79     }
80 
81     @VisibleForTesting
WifiEnabler(Context context, SwitchWidgetController switchWidget, MetricsFeatureProvider metricsFeatureProvider, ConnectivityManager connectivityManager)82     WifiEnabler(Context context, SwitchWidgetController switchWidget,
83             MetricsFeatureProvider metricsFeatureProvider,
84             ConnectivityManager connectivityManager) {
85         mContext = context;
86         mSwitchWidget = switchWidget;
87         mSwitchWidget.setListener(this);
88         mMetricsFeatureProvider = metricsFeatureProvider;
89         mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
90         mConnectivityManager = connectivityManager;
91 
92         mIntentFilter = new IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION);
93         // The order matters! We really should not depend on this. :(
94         mIntentFilter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION);
95         mIntentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
96 
97         setupSwitchController();
98     }
99 
setupSwitchController()100     public void setupSwitchController() {
101         final int state = mWifiManager.getWifiState();
102         handleWifiStateChanged(state);
103         if (!mListeningToOnSwitchChange) {
104             mSwitchWidget.startListening();
105             mListeningToOnSwitchChange = true;
106         }
107         mSwitchWidget.setupView();
108     }
109 
teardownSwitchController()110     public void teardownSwitchController() {
111         if (mListeningToOnSwitchChange) {
112             mSwitchWidget.stopListening();
113             mListeningToOnSwitchChange = false;
114         }
115         mSwitchWidget.teardownView();
116     }
117 
resume(Context context)118     public void resume(Context context) {
119         mContext = context;
120         // Wi-Fi state is sticky, so just let the receiver update UI
121         mContext.registerReceiver(mReceiver, mIntentFilter);
122         if (!mListeningToOnSwitchChange) {
123             mSwitchWidget.startListening();
124             mListeningToOnSwitchChange = true;
125         }
126     }
127 
pause()128     public void pause() {
129         mContext.unregisterReceiver(mReceiver);
130         if (mListeningToOnSwitchChange) {
131             mSwitchWidget.stopListening();
132             mListeningToOnSwitchChange = false;
133         }
134     }
135 
handleWifiStateChanged(int state)136     private void handleWifiStateChanged(int state) {
137         // Clear any previous state
138         mSwitchWidget.setDisabledByAdmin(null);
139 
140         switch (state) {
141             case WifiManager.WIFI_STATE_ENABLING:
142                 break;
143             case WifiManager.WIFI_STATE_ENABLED:
144                 setSwitchBarChecked(true);
145                 mSwitchWidget.setEnabled(true);
146                 break;
147             case WifiManager.WIFI_STATE_DISABLING:
148                 break;
149             case WifiManager.WIFI_STATE_DISABLED:
150                 setSwitchBarChecked(false);
151                 mSwitchWidget.setEnabled(true);
152                 break;
153             default:
154                 setSwitchBarChecked(false);
155                 mSwitchWidget.setEnabled(true);
156         }
157     }
158 
setSwitchBarChecked(boolean checked)159     private void setSwitchBarChecked(boolean checked) {
160         mStateMachineEvent = true;
161         mSwitchWidget.setChecked(checked);
162         mStateMachineEvent = false;
163     }
164 
handleStateChanged(@uppressWarningsR) NetworkInfo.DetailedState state)165     private void handleStateChanged(@SuppressWarnings("unused") NetworkInfo.DetailedState state) {
166         // After the refactoring from a CheckBoxPreference to a Switch, this method is useless since
167         // there is nowhere to display a summary.
168         // This code is kept in case a future change re-introduces an associated text.
169         /*
170         // WifiInfo is valid if and only if Wi-Fi is enabled.
171         // Here we use the state of the switch as an optimization.
172         if (state != null && mSwitch.isChecked()) {
173             WifiInfo info = mWifiManager.getConnectionInfo();
174             if (info != null) {
175                 //setSummary(Summary.get(mContext, info.getSSID(), state));
176             }
177         }
178         */
179     }
180 
181     @Override
onSwitchToggled(boolean isChecked)182     public boolean onSwitchToggled(boolean isChecked) {
183         //Do nothing if called as a result of a state machine event
184         if (mStateMachineEvent) {
185             return true;
186         }
187         // Show toast message if Wi-Fi is not allowed in airplane mode
188         if (isChecked && !WirelessUtils.isRadioAllowed(mContext, Settings.Global.RADIO_WIFI)) {
189             Toast.makeText(mContext, R.string.wifi_in_airplane_mode, Toast.LENGTH_SHORT).show();
190             // Reset switch to off. No infinite check/listener loop.
191             mSwitchWidget.setChecked(false);
192             return false;
193         }
194 
195         if (isChecked) {
196             mMetricsFeatureProvider.action(mContext, SettingsEnums.ACTION_WIFI_ON);
197         } else {
198             // Log if user was connected at the time of switching off.
199             mMetricsFeatureProvider.action(mContext, SettingsEnums.ACTION_WIFI_OFF,
200                     mConnected.get());
201         }
202         if (!mWifiManager.setWifiEnabled(isChecked)) {
203             // Error
204             mSwitchWidget.setEnabled(true);
205             Toast.makeText(mContext, R.string.wifi_error, Toast.LENGTH_SHORT).show();
206         }
207         return true;
208     }
209 }
210