| /* |
| * Copyright (C) 2020 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 android.accessibilityservice.util; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.annotation.StringRes; |
| import android.content.Context; |
| import android.content.pm.ApplicationInfo; |
| import android.content.pm.PackageManager; |
| import android.content.res.Resources; |
| import android.graphics.drawable.Drawable; |
| import android.util.TypedValue; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.regex.Pattern; |
| |
| /** |
| * Collection of utilities for accessibility service. |
| * |
| * @hide |
| */ |
| public final class AccessibilityUtils { |
| private AccessibilityUtils() {} |
| |
| // Used for html description of accessibility service. The <img> src tag must follow the |
| // prefix rule. e.g. <img src="R.drawable.fileName"/> |
| private static final String IMG_PREFIX = "R.drawable."; |
| private static final String ANCHOR_TAG = "a"; |
| private static final List<String> UNSUPPORTED_TAG_LIST = new ArrayList<>( |
| Collections.singletonList(ANCHOR_TAG)); |
| |
| /** |
| * Gets the filtered html string for |
| * {@link android.accessibilityservice.AccessibilityServiceInfo} and |
| * {@link android.accessibilityservice.AccessibilityShortcutInfo}. It filters |
| * the <img> tag which do not meet the custom specification and the <a> tag. |
| * |
| * @param text the target text is html format. |
| * @return the filtered html string. |
| */ |
| public static @NonNull String getFilteredHtmlText(@NonNull String text) { |
| final String replacementStart = "<invalidtag "; |
| final String replacementEnd = "</invalidtag>"; |
| |
| for (String tag : UNSUPPORTED_TAG_LIST) { |
| final String regexStart = "(?i)<" + tag + "(\\s+|>)"; |
| final String regexEnd = "(?i)</" + tag + "\\s*>"; |
| text = Pattern.compile(regexStart).matcher(text).replaceAll(replacementStart); |
| text = Pattern.compile(regexEnd).matcher(text).replaceAll(replacementEnd); |
| } |
| |
| final String regexInvalidImgTag = "(?i)<img\\s+(?!src\\s*=\\s*\"(?-i)" + IMG_PREFIX + ")"; |
| text = Pattern.compile(regexInvalidImgTag).matcher(text).replaceAll( |
| replacementStart); |
| |
| return text; |
| } |
| |
| /** |
| * Loads the animated image for |
| * {@link android.accessibilityservice.AccessibilityServiceInfo} and |
| * {@link android.accessibilityservice.AccessibilityShortcutInfo}. It checks the resource |
| * whether to exceed the screen size. |
| * |
| * @param context the current context. |
| * @param applicationInfo the current application. |
| * @param resId the animated image resource id. |
| * @return the animated image which is safe. |
| */ |
| @Nullable |
| public static Drawable loadSafeAnimatedImage(@NonNull Context context, |
| @NonNull ApplicationInfo applicationInfo, @StringRes int resId) { |
| if (resId == /* invalid */ 0) { |
| return null; |
| } |
| |
| final PackageManager packageManager = context.getPackageManager(); |
| final String packageName = applicationInfo.packageName; |
| final Drawable bannerDrawable = packageManager.getDrawable(packageName, resId, |
| applicationInfo); |
| if (bannerDrawable == null) { |
| return null; |
| } |
| |
| final boolean isImageWidthOverScreenLength = |
| bannerDrawable.getIntrinsicWidth() > getScreenWidthPixels(context); |
| final boolean isImageHeightOverScreenLength = |
| bannerDrawable.getIntrinsicHeight() > getScreenHeightPixels(context); |
| |
| return (isImageWidthOverScreenLength || isImageHeightOverScreenLength) |
| ? null |
| : bannerDrawable; |
| } |
| |
| /** |
| * Gets the width of the screen. |
| * |
| * @param context the current context. |
| * @return the width of the screen in term of pixels. |
| */ |
| private static int getScreenWidthPixels(@NonNull Context context) { |
| final Resources resources = context.getResources(); |
| final int screenWidthDp = resources.getConfiguration().screenWidthDp; |
| |
| return Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, screenWidthDp, |
| resources.getDisplayMetrics())); |
| } |
| |
| /** |
| * Gets the height of the screen. |
| * |
| * @param context the current context. |
| * @return the height of the screen in term of pixels. |
| */ |
| private static int getScreenHeightPixels(@NonNull Context context) { |
| final Resources resources = context.getResources(); |
| final int screenHeightDp = resources.getConfiguration().screenHeightDp; |
| |
| return Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, screenHeightDp, |
| resources.getDisplayMetrics())); |
| } |
| } |