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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.settings.accessibility;
import android.accessibilityservice.AccessibilityServiceInfo;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.storage.StorageManager;
import android.text.BidiFormatter;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.android.settings.R;
import java.util.List;
import java.util.Locale;
import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS;
/**
* Utility class for creating the dialog that asks users for explicit permission to grant
* all of the requested capabilities to an accessibility service before the service is enabled
*/
public class AccessibilityServiceWarning {
public static Dialog createCapabilitiesDialog(Activity parentActivity,
AccessibilityServiceInfo info, DialogInterface.OnClickListener listener) {
final AlertDialog ad = new AlertDialog.Builder(parentActivity)
.setTitle(parentActivity.getString(R.string.enable_service_title,
getServiceName(parentActivity, info)))
.setView(createEnableDialogContentView(parentActivity, info))
.setPositiveButton(android.R.string.ok, listener)
.setNegativeButton(android.R.string.cancel, listener)
.create();
final View.OnTouchListener filterTouchListener = (View v, MotionEvent event) -> {
// Filter obscured touches by consuming them.
if (((event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0)
|| ((event.getFlags() & MotionEvent.FLAG_WINDOW_IS_PARTIALLY_OBSCURED) != 0)) {
if (event.getAction() == MotionEvent.ACTION_UP) {
Toast.makeText(v.getContext(), R.string.touch_filtered_warning,
Toast.LENGTH_SHORT).show();
}
return true;
}
return false;
};
Window window = ad.getWindow();
WindowManager.LayoutParams params = window.getAttributes();
params.privateFlags |= PRIVATE_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS;
window.setAttributes(params);
ad.create();
ad.getButton(AlertDialog.BUTTON_POSITIVE).setOnTouchListener(filterTouchListener);
ad.setCanceledOnTouchOutside(true);
return ad;
}
/**
* Return whether the device is encrypted with legacy full disk encryption. Newer devices
* should be using File Based Encryption.
*
* @return true if device is encrypted
*/
private static boolean isFullDiskEncrypted() {
return StorageManager.isNonDefaultBlockEncrypted();
}
/**
* Get a content View for a dialog to confirm that they want to enable a service.
*
* @param context A valid context
* @param info The info about a service
* @return A content view suitable for viewing
*/
private static View createEnableDialogContentView(Context context,
AccessibilityServiceInfo info) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
View content = inflater.inflate(R.layout.enable_accessibility_service_dialog_content,
null);
TextView encryptionWarningView = (TextView) content.findViewById(
R.id.encryption_warning);
if (isFullDiskEncrypted()) {
String text = context.getString(R.string.enable_service_encryption_warning,
getServiceName(context, info));
encryptionWarningView.setText(text);
encryptionWarningView.setVisibility(View.VISIBLE);
} else {
encryptionWarningView.setVisibility(View.GONE);
}
TextView capabilitiesHeaderView = (TextView) content.findViewById(
R.id.capabilities_header);
capabilitiesHeaderView.setText(context.getString(R.string.capabilities_list_title,
getServiceName(context, info)));
LinearLayout capabilitiesView = (LinearLayout) content.findViewById(R.id.capabilities);
// This capability is implicit for all services.
View capabilityView = inflater.inflate(
com.android.internal.R.layout.app_permission_item_old, null);
ImageView imageView = (ImageView) capabilityView.findViewById(
com.android.internal.R.id.perm_icon);
imageView.setImageDrawable(context.getDrawable(
com.android.internal.R.drawable.ic_text_dot));
TextView labelView = (TextView) capabilityView.findViewById(
com.android.internal.R.id.permission_group);
labelView.setText(context.getString(
R.string.capability_title_receiveAccessibilityEvents));
TextView descriptionView = (TextView) capabilityView.findViewById(
com.android.internal.R.id.permission_list);
descriptionView.setText(
context.getString(R.string.capability_desc_receiveAccessibilityEvents));
List<AccessibilityServiceInfo.CapabilityInfo> capabilities =
info.getCapabilityInfos(context);
capabilitiesView.addView(capabilityView);
// Service-specific capabilities.
final int capabilityCount = capabilities.size();
for (int i = 0; i < capabilityCount; i++) {
AccessibilityServiceInfo.CapabilityInfo capability = capabilities.get(i);
capabilityView = inflater.inflate(
com.android.internal.R.layout.app_permission_item_old, null);
imageView = (ImageView) capabilityView.findViewById(
com.android.internal.R.id.perm_icon);
imageView.setImageDrawable(context.getDrawable(
com.android.internal.R.drawable.ic_text_dot));
labelView = (TextView) capabilityView.findViewById(
com.android.internal.R.id.permission_group);
labelView.setText(context.getString(capability.titleResId));
descriptionView = (TextView) capabilityView.findViewById(
com.android.internal.R.id.permission_list);
descriptionView.setText(context.getString(capability.descResId));
capabilitiesView.addView(capabilityView);
}
return content;
}
// Get the service name and bidi wrap it to protect from bidi side effects.
private static CharSequence getServiceName(Context context, AccessibilityServiceInfo info) {
final Locale locale = context.getResources().getConfiguration().getLocales().get(0);
final CharSequence label =
info.getResolveInfo().loadLabel(context.getPackageManager());
return BidiFormatter.getInstance(locale).unicodeWrap(label);
}
}
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