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      1 /*
      2  * Copyright (C) 2017 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.content.ContentResolver;
     20 import android.content.Context;
     21 import android.database.ContentObserver;
     22 import android.net.Uri;
     23 import android.os.Handler;
     24 import android.provider.Settings;
     25 import android.support.v14.preference.SwitchPreference;
     26 import android.support.v7.preference.Preference;
     27 import android.support.v7.preference.PreferenceScreen;
     28 import android.text.TextUtils;
     29 
     30 import com.android.settings.core.PreferenceControllerMixin;
     31 import com.android.settingslib.core.AbstractPreferenceController;
     32 import com.android.settingslib.core.lifecycle.Lifecycle;
     33 import com.android.settingslib.core.lifecycle.LifecycleObserver;
     34 import com.android.settingslib.core.lifecycle.events.OnPause;
     35 import com.android.settingslib.core.lifecycle.events.OnResume;
     36 
     37 /**
     38  * {@link AbstractPreferenceController} that controls whether we should notify user when open
     39  * network is available.
     40  */
     41 public class NotifyOpenNetworksPreferenceController extends AbstractPreferenceController
     42         implements PreferenceControllerMixin, LifecycleObserver, OnResume, OnPause {
     43 
     44     private static final String KEY_NOTIFY_OPEN_NETWORKS = "notify_open_networks";
     45     private SettingObserver mSettingObserver;
     46 
     47     public NotifyOpenNetworksPreferenceController(Context context, Lifecycle lifecycle) {
     48         super(context);
     49         lifecycle.addObserver(this);
     50     }
     51 
     52     @Override
     53     public void displayPreference(PreferenceScreen screen) {
     54         super.displayPreference(screen);
     55         mSettingObserver = new SettingObserver(screen.findPreference(KEY_NOTIFY_OPEN_NETWORKS));
     56     }
     57 
     58     @Override
     59     public void onResume() {
     60         if (mSettingObserver != null) {
     61             mSettingObserver.register(mContext.getContentResolver(), true /* register */);
     62         }
     63     }
     64 
     65     @Override
     66     public void onPause() {
     67         if (mSettingObserver != null) {
     68             mSettingObserver.register(mContext.getContentResolver(), false /* register */);
     69         }
     70     }
     71 
     72     @Override
     73     public boolean isAvailable() {
     74         return true;
     75     }
     76 
     77     @Override
     78     public boolean handlePreferenceTreeClick(Preference preference) {
     79         if (!TextUtils.equals(preference.getKey(), KEY_NOTIFY_OPEN_NETWORKS)) {
     80             return false;
     81         }
     82         if (!(preference instanceof SwitchPreference)) {
     83             return false;
     84         }
     85         Settings.Global.putInt(mContext.getContentResolver(),
     86                 Settings.Global.WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON,
     87                 ((SwitchPreference) preference).isChecked() ? 1 : 0);
     88         return true;
     89     }
     90 
     91     @Override
     92     public String getPreferenceKey() {
     93         return KEY_NOTIFY_OPEN_NETWORKS;
     94     }
     95 
     96     @Override
     97     public void updateState(Preference preference) {
     98         if (!(preference instanceof SwitchPreference)) {
     99             return;
    100         }
    101         final SwitchPreference notifyOpenNetworks = (SwitchPreference) preference;
    102         notifyOpenNetworks.setChecked(Settings.Global.getInt(mContext.getContentResolver(),
    103                 Settings.Global.WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON, 0) == 1);
    104     }
    105 
    106     class SettingObserver extends ContentObserver {
    107         private final Uri NETWORKS_AVAILABLE_URI = Settings.Global.getUriFor(
    108                 Settings.Global.WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON);
    109 
    110         private final Preference mPreference;
    111 
    112         public SettingObserver(Preference preference) {
    113             super(new Handler());
    114             mPreference = preference;
    115         }
    116 
    117         public void register(ContentResolver cr, boolean register) {
    118             if (register) {
    119                 cr.registerContentObserver(NETWORKS_AVAILABLE_URI, false, this);
    120             } else {
    121                 cr.unregisterContentObserver(this);
    122             }
    123         }
    124 
    125         @Override
    126         public void onChange(boolean selfChange, Uri uri) {
    127             super.onChange(selfChange, uri);
    128             if (NETWORKS_AVAILABLE_URI.equals(uri)) {
    129                 updateState(mPreference);
    130             }
    131         }
    132     }
    133 }
    134