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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.applications.assist;
     18 
     19 import android.content.ComponentName;
     20 import android.content.Context;
     21 import android.net.Uri;
     22 import android.os.UserHandle;
     23 import android.provider.Settings;
     24 import android.support.v7.preference.Preference;
     25 import android.support.v7.preference.PreferenceScreen;
     26 import android.support.v7.preference.TwoStatePreference;
     27 
     28 import com.android.internal.annotations.VisibleForTesting;
     29 import com.android.internal.app.AssistUtils;
     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 import java.util.Arrays;
     38 import java.util.List;
     39 
     40 public class AssistFlashScreenPreferenceController extends AbstractPreferenceController
     41         implements PreferenceControllerMixin, Preference.OnPreferenceChangeListener,
     42         LifecycleObserver, OnResume, OnPause {
     43 
     44     private static final String KEY_FLASH = "flash";
     45 
     46     private final AssistUtils mAssistUtils;
     47     private final SettingObserver mSettingObserver;
     48     private PreferenceScreen mScreen;
     49     private Preference mPreference;
     50 
     51     public AssistFlashScreenPreferenceController(Context context, Lifecycle lifecycle) {
     52         super(context);
     53         mAssistUtils = new AssistUtils(context);
     54         mSettingObserver = new SettingObserver();
     55 
     56         if (lifecycle != null) {
     57             lifecycle.addObserver(this);
     58         }
     59     }
     60 
     61     @Override
     62     public boolean isAvailable() {
     63         return getCurrentAssist() != null && allowDisablingAssistDisclosure();
     64     }
     65 
     66     @Override
     67     public String getPreferenceKey() {
     68         return KEY_FLASH;
     69     }
     70 
     71     @Override
     72     public void displayPreference(PreferenceScreen screen) {
     73         mScreen = screen;
     74         mPreference = screen.findPreference(getPreferenceKey());
     75         super.displayPreference(screen);
     76     }
     77 
     78     @Override
     79     public void onResume() {
     80         mSettingObserver.register(mContext.getContentResolver(), true);
     81         updatePreference();
     82     }
     83 
     84     @Override
     85     public void updateState(Preference preference) {
     86         updatePreference();
     87     }
     88 
     89     @Override
     90     public void onPause() {
     91         mSettingObserver.register(mContext.getContentResolver(), false);
     92     }
     93 
     94     @Override
     95     public boolean onPreferenceChange(Preference preference, Object newValue) {
     96         Settings.Secure.putInt(mContext.getContentResolver(),
     97                 Settings.Secure.ASSIST_DISCLOSURE_ENABLED,
     98                 (boolean) newValue ? 1 : 0);
     99         return true;
    100     }
    101 
    102     private void updatePreference() {
    103         if (mPreference == null || !(mPreference instanceof TwoStatePreference)) {
    104             return;
    105         }
    106         if (isAvailable()) {
    107             if (mScreen.findPreference(getPreferenceKey()) == null) {
    108                 // add it if it's not on scree
    109                 mScreen.addPreference(mPreference);
    110             }
    111         } else {
    112             mScreen.removePreference(mPreference);
    113         }
    114         ComponentName assistant = getCurrentAssist();
    115 
    116         boolean isContextChecked = AssistContextPreferenceController.isChecked(mContext);
    117 
    118         mPreference.setEnabled(isContextChecked && isPreInstalledAssistant(assistant));
    119         ((TwoStatePreference) mPreference).setChecked(willShowFlash(assistant));
    120     }
    121 
    122     @VisibleForTesting
    123     boolean willShowFlash(ComponentName assistant) {
    124         return AssistUtils.shouldDisclose(mContext, assistant);
    125     }
    126 
    127     @VisibleForTesting
    128     boolean isPreInstalledAssistant(ComponentName assistant) {
    129         return AssistUtils.isPreinstalledAssistant(mContext, assistant);
    130     }
    131 
    132     @VisibleForTesting
    133     boolean allowDisablingAssistDisclosure() {
    134         return AssistUtils.allowDisablingAssistDisclosure(mContext);
    135     }
    136 
    137     private ComponentName getCurrentAssist() {
    138         return mAssistUtils.getAssistComponentForUser(UserHandle.myUserId());
    139     }
    140 
    141     class SettingObserver extends AssistSettingObserver {
    142 
    143         private final Uri URI =
    144                 Settings.Secure.getUriFor(Settings.Secure.ASSIST_DISCLOSURE_ENABLED);
    145         private final Uri CONTEXT_URI =
    146                 Settings.Secure.getUriFor(Settings.Secure.ASSIST_STRUCTURE_ENABLED);
    147 
    148         @Override
    149         protected List<Uri> getSettingUris() {
    150             return Arrays.asList(URI, CONTEXT_URI);
    151         }
    152 
    153         @Override
    154         public void onSettingChange() {
    155             updatePreference();
    156         }
    157     }
    158 
    159 
    160 }
    161