1 /*
2  * Copyright (C) 2018 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.accessibility;
18 
19 import static com.android.settings.accessibility.AccessibilityUtil.State.OFF;
20 import static com.android.settings.accessibility.AccessibilityUtil.State.ON;
21 
22 import android.accessibilityservice.AccessibilityServiceInfo;
23 import android.content.ComponentName;
24 import android.content.ContentResolver;
25 import android.content.Context;
26 import android.provider.Settings;
27 import android.view.accessibility.AccessibilityManager;
28 
29 import com.android.settings.R;
30 import com.android.settings.core.TogglePreferenceController;
31 import com.android.settingslib.accessibility.AccessibilityUtils;
32 
33 import java.util.List;
34 import java.util.Set;
35 
36 /**
37  * PreferenceController for accessibility services to be used by Slices.
38  * Wraps the common logic which enables accessibility services and checks their availability.
39  * <p>
40  * Should not be used in a {@link com.android.settings.dashboard.DashboardFragment}.
41  */
42 public class AccessibilitySlicePreferenceController extends TogglePreferenceController {
43 
44     private final ComponentName mComponentName;
45 
46     private static final String EMPTY_STRING = "";
47 
AccessibilitySlicePreferenceController(Context context, String preferenceKey)48     public AccessibilitySlicePreferenceController(Context context, String preferenceKey) {
49         super(context, preferenceKey);
50         mComponentName = ComponentName.unflattenFromString(getPreferenceKey());
51 
52         if (mComponentName == null) {
53             throw new IllegalArgumentException(
54                     "Illegal Component Name from: " + preferenceKey);
55         }
56     }
57 
58     @Override
getSummary()59     public CharSequence getSummary() {
60         final AccessibilityServiceInfo serviceInfo = getAccessibilityServiceInfo();
61 
62         return serviceInfo == null ? EMPTY_STRING : AccessibilitySettings.getServiceSummary(
63                 mContext, serviceInfo, isChecked());
64     }
65 
66     @Override
isChecked()67     public boolean isChecked() {
68         final ContentResolver contentResolver = mContext.getContentResolver();
69         final boolean accessibilityEnabled = Settings.Secure.getInt(contentResolver,
70                 Settings.Secure.ACCESSIBILITY_ENABLED, OFF) == ON;
71 
72         if (!accessibilityEnabled) {
73             return false;
74         }
75 
76         final Set<ComponentName> componentNames =
77                 AccessibilityUtils.getEnabledServicesFromSettings(mContext);
78 
79         return componentNames.contains(mComponentName);
80     }
81 
82     @Override
setChecked(boolean isChecked)83     public boolean setChecked(boolean isChecked) {
84         if (getAccessibilityServiceInfo() == null) {
85             return false;
86         }
87         AccessibilityUtils.setAccessibilityServiceState(mContext, mComponentName, isChecked);
88         return isChecked == isChecked(); // Verify that it was probably changed.
89     }
90 
91     @Override
getAvailabilityStatus()92     public int getAvailabilityStatus() {
93         // Return unsupported when the service is disabled or not installed.
94         return getAccessibilityServiceInfo() == null ? UNSUPPORTED_ON_DEVICE : AVAILABLE;
95     }
96 
97     @Override
isPublicSlice()98     public boolean isPublicSlice() {
99         return true;
100     }
101 
102     @Override
getSliceHighlightMenuRes()103     public int getSliceHighlightMenuRes() {
104         return R.string.menu_key_accessibility;
105     }
106 
getAccessibilityServiceInfo()107     private AccessibilityServiceInfo getAccessibilityServiceInfo() {
108         final AccessibilityManager accessibilityManager = mContext.getSystemService(
109                 AccessibilityManager.class);
110         final List<AccessibilityServiceInfo> serviceList =
111                 accessibilityManager.getInstalledAccessibilityServiceList();
112 
113         for (AccessibilityServiceInfo serviceInfo : serviceList) {
114             if (mComponentName.equals(serviceInfo.getComponentName())) {
115                 return serviceInfo;
116             }
117         }
118 
119         return null;
120     }
121 }
122