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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.Context;
     20 import android.provider.Settings;
     21 import android.support.v14.preference.SwitchPreference;
     22 import android.support.v7.preference.Preference;
     23 import android.text.TextUtils;
     24 
     25 import com.android.settings.core.PreferenceControllerMixin;
     26 import com.android.settingslib.core.AbstractPreferenceController;
     27 
     28 /**
     29  * {@link AbstractPreferenceController} that controls whether we should fall back to celluar when
     30  * wifi is bad.
     31  */
     32 public class CellularFallbackPreferenceController extends AbstractPreferenceController
     33         implements PreferenceControllerMixin {
     34 
     35     private static final String KEY_CELLULAR_FALLBACK = "wifi_cellular_data_fallback";
     36 
     37 
     38     public CellularFallbackPreferenceController(Context context) {
     39         super(context);
     40     }
     41 
     42     @Override
     43     public boolean isAvailable() {
     44         return !avoidBadWifiConfig();
     45     }
     46 
     47     @Override
     48     public String getPreferenceKey() {
     49         return KEY_CELLULAR_FALLBACK;
     50     }
     51 
     52     @Override
     53     public boolean handlePreferenceTreeClick(Preference preference) {
     54         if (!TextUtils.equals(preference.getKey(), KEY_CELLULAR_FALLBACK)) {
     55             return false;
     56         }
     57         if (!(preference instanceof SwitchPreference)) {
     58             return false;
     59         }
     60         // On: avoid bad wifi. Off: prompt.
     61         String settingName = Settings.Global.NETWORK_AVOID_BAD_WIFI;
     62         Settings.Global.putString(mContext.getContentResolver(), settingName,
     63                 ((SwitchPreference) preference).isChecked() ? "1" : null);
     64         return true;
     65     }
     66 
     67     @Override
     68     public void updateState(Preference preference) {
     69         final boolean currentSetting = avoidBadWifiCurrentSettings();
     70         // TODO: can this ever be null? The return value of avoidBadWifiConfig() can only
     71         // change if the resources change, but if that happens the activity will be recreated...
     72         if (preference != null) {
     73             SwitchPreference pref = (SwitchPreference) preference;
     74             pref.setChecked(currentSetting);
     75         }
     76     }
     77 
     78     private boolean avoidBadWifiConfig() {
     79         return mContext.getResources().getInteger(
     80                 com.android.internal.R.integer.config_networkAvoidBadWifi) == 1;
     81     }
     82 
     83     private boolean avoidBadWifiCurrentSettings() {
     84         return "1".equals(Settings.Global.getString(mContext.getContentResolver(),
     85                 Settings.Global.NETWORK_AVOID_BAD_WIFI));
     86     }
     87 }
     88