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      1 /*
      2  * Copyright (C) 2015 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 android.accessibilityservice.AccessibilityServiceInfo;
     20 import android.content.ComponentName;
     21 import android.content.Context;
     22 import android.content.pm.ServiceInfo;
     23 import android.os.Bundle;
     24 import android.support.v7.preference.Preference;
     25 import android.text.TextUtils;
     26 import android.view.accessibility.AccessibilityManager;
     27 
     28 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
     29 import com.android.settings.R;
     30 import com.android.settings.SettingsPreferenceFragment;
     31 
     32 import java.util.List;
     33 
     34 /**
     35  * Activity with the accessibility settings specific to Setup Wizard.
     36  */
     37 public class AccessibilitySettingsForSetupWizard extends SettingsPreferenceFragment
     38         implements Preference.OnPreferenceChangeListener {
     39 
     40     // Preferences.
     41     private static final String DISPLAY_MAGNIFICATION_PREFERENCE =
     42             "screen_magnification_preference";
     43     private static final String SCREEN_READER_PREFERENCE = "screen_reader_preference";
     44     private static final String SELECT_TO_SPEAK_PREFERENCE = "select_to_speak_preference";
     45     private static final String FONT_SIZE_PREFERENCE = "font_size_preference";
     46 
     47     // Package names and service names used to identify screen reader and SelectToSpeak services.
     48     private static final String SCREEN_READER_PACKAGE_NAME = "com.google.android.marvin.talkback";
     49     private static final String SCREEN_READER_SERVICE_NAME =
     50             "com.google.android.marvin.talkback.TalkBackService";
     51     private static final String SELECT_TO_SPEAK_PACKAGE_NAME = "com.google.android.marvin.talkback";
     52     private static final String SELECT_TO_SPEAK_SERVICE_NAME =
     53             "com.google.android.accessibility.selecttospeak.SelectToSpeakService";
     54 
     55     // Preference controls.
     56     private Preference mDisplayMagnificationPreference;
     57     private Preference mScreenReaderPreference;
     58     private Preference mSelectToSpeakPreference;
     59 
     60     @Override
     61     public int getMetricsCategory() {
     62         return MetricsEvent.SUW_ACCESSIBILITY;
     63     }
     64 
     65     @Override
     66     public void onCreate(Bundle icicle) {
     67         super.onCreate(icicle);
     68         addPreferencesFromResource(R.xml.accessibility_settings_for_setup_wizard);
     69 
     70         mDisplayMagnificationPreference = findPreference(DISPLAY_MAGNIFICATION_PREFERENCE);
     71         mScreenReaderPreference = findPreference(SCREEN_READER_PREFERENCE);
     72         mSelectToSpeakPreference = findPreference(SELECT_TO_SPEAK_PREFERENCE);
     73     }
     74 
     75     @Override
     76     public void onResume() {
     77         super.onResume();
     78         updateAccessibilityServicePreference(mScreenReaderPreference,
     79                 findService(SCREEN_READER_PACKAGE_NAME, SCREEN_READER_SERVICE_NAME));
     80         updateAccessibilityServicePreference(mSelectToSpeakPreference,
     81                 findService(SELECT_TO_SPEAK_PACKAGE_NAME, SELECT_TO_SPEAK_SERVICE_NAME));
     82         configureMagnificationPreferenceIfNeeded(mDisplayMagnificationPreference);
     83     }
     84 
     85     @Override
     86     public void onActivityCreated(Bundle savedInstanceState) {
     87         super.onActivityCreated(savedInstanceState);
     88         setHasOptionsMenu(false);
     89     }
     90 
     91     @Override
     92     public boolean onPreferenceChange(Preference preference, Object newValue) {
     93         return false;
     94     }
     95 
     96     @Override
     97     public boolean onPreferenceTreeClick(Preference preference) {
     98         if (mDisplayMagnificationPreference == preference) {
     99             Bundle extras = mDisplayMagnificationPreference.getExtras();
    100             extras.putBoolean(AccessibilitySettings.EXTRA_LAUNCHED_FROM_SUW, true);
    101         }
    102 
    103         return super.onPreferenceTreeClick(preference);
    104     }
    105 
    106     private AccessibilityServiceInfo findService(String packageName, String serviceName) {
    107         final AccessibilityManager manager =
    108                 getActivity().getSystemService(AccessibilityManager.class);
    109         final List<AccessibilityServiceInfo> accessibilityServices =
    110                 manager.getInstalledAccessibilityServiceList();
    111         for (AccessibilityServiceInfo info : accessibilityServices) {
    112             ServiceInfo serviceInfo = info.getResolveInfo().serviceInfo;
    113             if (packageName.equals(serviceInfo.packageName)
    114                     && serviceName.equals(serviceInfo.name)) {
    115                 return info;
    116             }
    117         }
    118 
    119         return null;
    120     }
    121 
    122     private void updateAccessibilityServicePreference(Preference preference,
    123             AccessibilityServiceInfo info) {
    124         if (info == null) {
    125             getPreferenceScreen().removePreference(preference);
    126             return;
    127         }
    128 
    129         ServiceInfo serviceInfo = info.getResolveInfo().serviceInfo;
    130         String title = info.getResolveInfo().loadLabel(getPackageManager()).toString();
    131         preference.setTitle(title);
    132         ComponentName componentName = new ComponentName(serviceInfo.packageName, serviceInfo.name);
    133         preference.setKey(componentName.flattenToString());
    134 
    135         // Update the extras.
    136         Bundle extras = preference.getExtras();
    137         extras.putParcelable(AccessibilitySettings.EXTRA_COMPONENT_NAME, componentName);
    138 
    139         extras.putString(AccessibilitySettings.EXTRA_PREFERENCE_KEY,
    140             preference.getKey());
    141         extras.putString(AccessibilitySettings.EXTRA_TITLE, title);
    142 
    143         String description = info.loadDescription(getPackageManager());
    144         if (TextUtils.isEmpty(description)) {
    145             description = getString(R.string.accessibility_service_default_description);
    146         }
    147         extras.putString(AccessibilitySettings.EXTRA_SUMMARY, description);
    148     }
    149 
    150     private static void configureMagnificationPreferenceIfNeeded(Preference preference) {
    151         // Some devices support only a single magnification mode. In these cases, we redirect to
    152         // the magnification mode's UI directly, rather than showing a PreferenceScreen with a
    153         // single list item.
    154         final Context context = preference.getContext();
    155         if (!MagnificationPreferenceFragment.isApplicable(context.getResources())) {
    156             preference.setFragment(
    157                     ToggleScreenMagnificationPreferenceFragmentForSetupWizard.class.getName());
    158             final Bundle extras = preference.getExtras();
    159             MagnificationPreferenceFragment.populateMagnificationGesturesPreferenceExtras(extras,
    160                     context);
    161         }
    162     }
    163 }
    164