1 /* 2 * Copyright (C) 2016 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.app.Activity; 21 import android.app.AlertDialog; 22 import android.app.Dialog; 23 import android.content.Context; 24 import android.content.DialogInterface; 25 import android.os.storage.StorageManager; 26 import android.text.BidiFormatter; 27 import android.view.LayoutInflater; 28 import android.view.MotionEvent; 29 import android.view.View; 30 import android.view.Window; 31 import android.view.WindowManager; 32 import android.widget.ImageView; 33 import android.widget.LinearLayout; 34 import android.widget.TextView; 35 import android.widget.Toast; 36 37 import com.android.settings.R; 38 39 import java.util.List; 40 import java.util.Locale; 41 42 import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS; 43 44 /** 45 * Utility class for creating the dialog that asks users for explicit permission to grant 46 * all of the requested capabilities to an accessibility service before the service is enabled 47 */ 48 public class AccessibilityServiceWarning { createCapabilitiesDialog(Activity parentActivity, AccessibilityServiceInfo info, DialogInterface.OnClickListener listener)49 public static Dialog createCapabilitiesDialog(Activity parentActivity, 50 AccessibilityServiceInfo info, DialogInterface.OnClickListener listener) { 51 final AlertDialog ad = new AlertDialog.Builder(parentActivity) 52 .setTitle(parentActivity.getString(R.string.enable_service_title, 53 getServiceName(parentActivity, info))) 54 .setView(createEnableDialogContentView(parentActivity, info)) 55 .setPositiveButton(android.R.string.ok, listener) 56 .setNegativeButton(android.R.string.cancel, listener) 57 .create(); 58 59 final View.OnTouchListener filterTouchListener = (View v, MotionEvent event) -> { 60 // Filter obscured touches by consuming them. 61 if (((event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) 62 || ((event.getFlags() & MotionEvent.FLAG_WINDOW_IS_PARTIALLY_OBSCURED) != 0)) { 63 if (event.getAction() == MotionEvent.ACTION_UP) { 64 Toast.makeText(v.getContext(), R.string.touch_filtered_warning, 65 Toast.LENGTH_SHORT).show(); 66 } 67 return true; 68 } 69 return false; 70 }; 71 72 Window window = ad.getWindow(); 73 WindowManager.LayoutParams params = window.getAttributes(); 74 params.privateFlags |= PRIVATE_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS; 75 window.setAttributes(params); 76 ad.create(); 77 ad.getButton(AlertDialog.BUTTON_POSITIVE).setOnTouchListener(filterTouchListener); 78 ad.setCanceledOnTouchOutside(true); 79 80 return ad; 81 } 82 83 /** 84 * Return whether the device is encrypted with legacy full disk encryption. Newer devices 85 * should be using File Based Encryption. 86 * 87 * @return true if device is encrypted 88 */ isFullDiskEncrypted()89 private static boolean isFullDiskEncrypted() { 90 return StorageManager.isNonDefaultBlockEncrypted(); 91 } 92 93 /** 94 * Get a content View for a dialog to confirm that they want to enable a service. 95 * 96 * @param context A valid context 97 * @param info The info about a service 98 * @return A content view suitable for viewing 99 */ createEnableDialogContentView(Context context, AccessibilityServiceInfo info)100 private static View createEnableDialogContentView(Context context, 101 AccessibilityServiceInfo info) { 102 LayoutInflater inflater = (LayoutInflater) context.getSystemService( 103 Context.LAYOUT_INFLATER_SERVICE); 104 105 View content = inflater.inflate(R.layout.enable_accessibility_service_dialog_content, 106 null); 107 108 TextView encryptionWarningView = (TextView) content.findViewById( 109 R.id.encryption_warning); 110 if (isFullDiskEncrypted()) { 111 String text = context.getString(R.string.enable_service_encryption_warning, 112 getServiceName(context, info)); 113 encryptionWarningView.setText(text); 114 encryptionWarningView.setVisibility(View.VISIBLE); 115 } else { 116 encryptionWarningView.setVisibility(View.GONE); 117 } 118 119 TextView capabilitiesHeaderView = (TextView) content.findViewById( 120 R.id.capabilities_header); 121 capabilitiesHeaderView.setText(context.getString(R.string.capabilities_list_title, 122 getServiceName(context, info))); 123 124 LinearLayout capabilitiesView = (LinearLayout) content.findViewById(R.id.capabilities); 125 126 // This capability is implicit for all services. 127 View capabilityView = inflater.inflate( 128 com.android.internal.R.layout.app_permission_item_old, null); 129 130 ImageView imageView = (ImageView) capabilityView.findViewById( 131 com.android.internal.R.id.perm_icon); 132 imageView.setImageDrawable(context.getDrawable( 133 com.android.internal.R.drawable.ic_text_dot)); 134 135 TextView labelView = (TextView) capabilityView.findViewById( 136 com.android.internal.R.id.permission_group); 137 labelView.setText(context.getString( 138 R.string.capability_title_receiveAccessibilityEvents)); 139 140 TextView descriptionView = (TextView) capabilityView.findViewById( 141 com.android.internal.R.id.permission_list); 142 descriptionView.setText( 143 context.getString(R.string.capability_desc_receiveAccessibilityEvents)); 144 145 List<AccessibilityServiceInfo.CapabilityInfo> capabilities = 146 info.getCapabilityInfos(context); 147 148 capabilitiesView.addView(capabilityView); 149 150 // Service-specific capabilities. 151 final int capabilityCount = capabilities.size(); 152 for (int i = 0; i < capabilityCount; i++) { 153 AccessibilityServiceInfo.CapabilityInfo capability = capabilities.get(i); 154 155 capabilityView = inflater.inflate( 156 com.android.internal.R.layout.app_permission_item_old, null); 157 158 imageView = (ImageView) capabilityView.findViewById( 159 com.android.internal.R.id.perm_icon); 160 imageView.setImageDrawable(context.getDrawable( 161 com.android.internal.R.drawable.ic_text_dot)); 162 163 labelView = (TextView) capabilityView.findViewById( 164 com.android.internal.R.id.permission_group); 165 labelView.setText(context.getString(capability.titleResId)); 166 167 descriptionView = (TextView) capabilityView.findViewById( 168 com.android.internal.R.id.permission_list); 169 descriptionView.setText(context.getString(capability.descResId)); 170 171 capabilitiesView.addView(capabilityView); 172 } 173 174 return content; 175 } 176 177 // Get the service name and bidi wrap it to protect from bidi side effects. getServiceName(Context context, AccessibilityServiceInfo info)178 private static CharSequence getServiceName(Context context, AccessibilityServiceInfo info) { 179 final Locale locale = context.getResources().getConfiguration().getLocales().get(0); 180 final CharSequence label = 181 info.getResolveInfo().loadLabel(context.getPackageManager()); 182 return BidiFormatter.getInstance(locale).unicodeWrap(label); 183 } 184 } 185