core/java/com/android/internal/app/AccessibilityButtonChooserActivity.java

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