AssistContextPreferenceController.java revision 777ed2535a7fd6f618a0d12f381af99252283574 
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
17package com.android.settings.applications.assist;
18
19import android.content.Context;
20import android.net.Uri;
21import android.os.UserHandle;
22import android.provider.Settings;
23import android.support.v7.preference.Preference;
24import android.support.v7.preference.PreferenceScreen;
25import android.support.v7.preference.TwoStatePreference;
26
27import com.android.internal.app.AssistUtils;
28import com.android.settings.core.PreferenceController;
29import com.android.settingslib.core.lifecycle.Lifecycle;
30import com.android.settingslib.core.lifecycle.LifecycleObserver;
31import com.android.settingslib.core.lifecycle.events.OnPause;
32import com.android.settingslib.core.lifecycle.events.OnResume;
33
34import java.util.Arrays;
35import java.util.List;
36
37public class AssistContextPreferenceController extends PreferenceController
38        implements Preference.OnPreferenceChangeListener, LifecycleObserver, OnResume, OnPause {
39
40    private static final String KEY_CONTEXT = "context";
41
42    private final AssistUtils mAssistUtils;
43    private final SettingObserver mSettingObserver;
44
45    private Preference mPreference;
46    private PreferenceScreen mScreen;
47
48    public AssistContextPreferenceController(Context context, Lifecycle lifecycle) {
49        super(context);
50        mAssistUtils = new AssistUtils(context);
51        mSettingObserver = new SettingObserver();
52
53        if (lifecycle != null) {
54            lifecycle.addObserver(this);
55        }
56    }
57
58    @Override
59    public boolean isAvailable() {
60        return mAssistUtils.getAssistComponentForUser(UserHandle.myUserId()) != null;
61    }
62
63    @Override
64    public String getPreferenceKey() {
65        return KEY_CONTEXT;
66    }
67
68    @Override
69    public void displayPreference(PreferenceScreen screen) {
70        mScreen = screen;
71        mPreference = screen.findPreference(getPreferenceKey());
72        super.displayPreference(screen);
73    }
74
75    @Override
76    public void onResume() {
77        mSettingObserver.register(mContext.getContentResolver(), true);
78        updatePreference();
79    }
80
81    @Override
82    public void updateState(Preference preference) {
83        updatePreference();
84    }
85
86    @Override
87    public void onPause() {
88        mSettingObserver.register(mContext.getContentResolver(), false);
89    }
90
91
92    private void updatePreference() {
93        if (mPreference == null || !(mPreference instanceof TwoStatePreference)) {
94            return;
95        }
96        if (isAvailable()) {
97            if (mScreen.findPreference(getPreferenceKey()) == null) {
98                // add it if it's not on scree
99                mScreen.addPreference(mPreference);
100            }
101        } else {
102            mScreen.removePreference(mPreference);
103        }
104
105        ((TwoStatePreference) mPreference).setChecked(isChecked(mContext));
106    }
107
108    @Override
109    public boolean onPreferenceChange(Preference preference, Object newValue) {
110        Settings.Secure.putInt(mContext.getContentResolver(),
111                Settings.Secure.ASSIST_STRUCTURE_ENABLED,
112                (boolean) newValue ? 1 : 0);
113        return true;
114    }
115
116    static boolean isChecked(Context context) {
117        return Settings.Secure.getInt(context.getContentResolver(),
118                Settings.Secure.ASSIST_STRUCTURE_ENABLED, 1) != 0;
119    }
120
121    class SettingObserver extends AssistSettingObserver {
122
123        private final Uri URI =
124                Settings.Secure.getUriFor(Settings.Secure.ASSIST_STRUCTURE_ENABLED);
125
126        @Override
127        protected List<Uri> getSettingUris() {
128            return Arrays.asList(URI);
129        }
130
131        @Override
132        public void onSettingChange() {
133            updatePreference();
134        }
135    }
136}
137