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