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 package com.android.internal.app;
17 
18 import android.accessibilityservice.AccessibilityServiceInfo;
19 import android.annotation.NonNull;
20 import android.annotation.Nullable;
21 import android.app.Activity;
22 import android.content.Context;
23 import android.graphics.drawable.Drawable;
24 import android.os.Bundle;
25 import android.provider.Settings;
26 import android.text.TextUtils;
27 import android.view.LayoutInflater;
28 import android.view.View;
29 import android.view.ViewGroup;
30 import android.view.accessibility.AccessibilityManager;
31 import android.widget.BaseAdapter;
32 import android.widget.GridView;
33 import android.widget.ImageView;
34 import android.widget.TextView;
35 
36 import com.android.internal.R;
37 import com.android.internal.widget.ResolverDrawerLayout;
38 
39 import java.util.ArrayList;
40 import java.util.Collections;
41 import java.util.List;
42 
43 /**
44  * Activity used to display and persist a service or feature target for the Accessibility button.
45  */
46 public class AccessibilityButtonChooserActivity extends Activity {
47 
48     private static final String MAGNIFICATION_COMPONENT_ID =
49             "com.android.server.accessibility.MagnificationController";
50 
51     private AccessibilityButtonTarget mMagnificationTarget = null;
52 
53     private List<AccessibilityButtonTarget> mTargets = null;
54 
55     @Override
onCreate(@ullable Bundle savedInstanceState)56     protected void onCreate(@Nullable Bundle savedInstanceState) {
57         super.onCreate(savedInstanceState);
58         setContentView(R.layout.accessibility_button_chooser);
59 
60         final ResolverDrawerLayout rdl = findViewById(R.id.contentPanel);
61         if (rdl != null) {
62             rdl.setOnDismissedListener(this::finish);
63         }
64 
65         String component = Settings.Secure.getString(getContentResolver(),
66                 Settings.Secure.ACCESSIBILITY_BUTTON_TARGET_COMPONENT);
67         if (TextUtils.isEmpty(component)) {
68             TextView prompt = findViewById(R.id.accessibility_button_prompt);
69             prompt.setVisibility(View.VISIBLE);
70         }
71 
72         mMagnificationTarget = new AccessibilityButtonTarget(this, MAGNIFICATION_COMPONENT_ID,
73                 R.string.accessibility_magnification_chooser_text,
74                 R.drawable.ic_accessibility_magnification);
75 
76         mTargets = getServiceAccessibilityButtonTargets(this);
77         if (Settings.Secure.getInt(getContentResolver(),
78                 Settings.Secure.ACCESSIBILITY_DISPLAY_MAGNIFICATION_NAVBAR_ENABLED, 0) == 1) {
79             mTargets.add(mMagnificationTarget);
80         }
81 
82         if (mTargets.size() < 2) {
83             // Why are we here?
84             finish();
85         }
86 
87         GridView gridview = findViewById(R.id.accessibility_button_chooser_grid);
88         gridview.setAdapter(new TargetAdapter());
89         gridview.setOnItemClickListener((parent, view, position, id) -> {
90             onTargetSelected(mTargets.get(position));
91         });
92     }
93 
getServiceAccessibilityButtonTargets( @onNull Context context)94     private static List<AccessibilityButtonTarget> getServiceAccessibilityButtonTargets(
95             @NonNull Context context) {
96         AccessibilityManager ams = (AccessibilityManager) context.getSystemService(
97                 Context.ACCESSIBILITY_SERVICE);
98         List<AccessibilityServiceInfo> services = ams.getEnabledAccessibilityServiceList(
99                 AccessibilityServiceInfo.FEEDBACK_ALL_MASK);
100         if (services == null) {
101             return Collections.emptyList();
102         }
103 
104         ArrayList<AccessibilityButtonTarget> targets = new ArrayList<>(services.size());
105         for (AccessibilityServiceInfo info : services) {
106             if ((info.flags & AccessibilityServiceInfo.FLAG_REQUEST_ACCESSIBILITY_BUTTON) != 0) {
107                 targets.add(new AccessibilityButtonTarget(context, info));
108             }
109         }
110 
111         return targets;
112     }
113 
onTargetSelected(AccessibilityButtonTarget target)114     private void onTargetSelected(AccessibilityButtonTarget target) {
115         Settings.Secure.putString(getContentResolver(),
116                 Settings.Secure.ACCESSIBILITY_BUTTON_TARGET_COMPONENT, target.getId());
117         finish();
118     }
119 
120     private class TargetAdapter extends BaseAdapter {
121         @Override
getCount()122         public int getCount() {
123             return mTargets.size();
124         }
125 
126         @Override
getItem(int position)127         public Object getItem(int position) {
128             return null;
129         }
130 
131         @Override
getItemId(int position)132         public long getItemId(int position) {
133             return position;
134         }
135 
136         @Override
getView(int position, View convertView, ViewGroup parent)137         public View getView(int position, View convertView, ViewGroup parent) {
138             LayoutInflater inflater = AccessibilityButtonChooserActivity.this.getLayoutInflater();
139             View root = inflater.inflate(R.layout.accessibility_button_chooser_item, parent, false);
140             final AccessibilityButtonTarget target = mTargets.get(position);
141             ImageView iconView = root.findViewById(R.id.accessibility_button_target_icon);
142             TextView labelView = root.findViewById(R.id.accessibility_button_target_label);
143             iconView.setImageDrawable(target.getDrawable());
144             labelView.setText(target.getLabel());
145             return root;
146         }
147     }
148 
149     private static class AccessibilityButtonTarget {
150         public String mId;
151         public CharSequence mLabel;
152         public Drawable mDrawable;
153 
AccessibilityButtonTarget(@onNull Context context, @NonNull AccessibilityServiceInfo serviceInfo)154         public AccessibilityButtonTarget(@NonNull Context context,
155                 @NonNull AccessibilityServiceInfo serviceInfo) {
156             this.mId = serviceInfo.getComponentName().flattenToString();
157             this.mLabel = serviceInfo.getResolveInfo().loadLabel(context.getPackageManager());
158             this.mDrawable = serviceInfo.getResolveInfo().loadIcon(context.getPackageManager());
159         }
160 
AccessibilityButtonTarget(Context context, @NonNull String id, int labelResId, int iconRes)161         public AccessibilityButtonTarget(Context context, @NonNull String id, int labelResId,
162                 int iconRes) {
163             this.mId = id;
164             this.mLabel = context.getText(labelResId);
165             this.mDrawable = context.getDrawable(iconRes);
166         }
167 
getId()168         public String getId() {
169             return mId;
170         }
171 
getLabel()172         public CharSequence getLabel() {
173             return mLabel;
174         }
175 
getDrawable()176         public Drawable getDrawable() {
177             return mDrawable;
178         }
179     }
180 }