Java tutorial
/* * 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.talkback.speechrules; import android.content.Context; import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat; import android.text.SpannableStringBuilder; import android.view.accessibility.AccessibilityEvent; import com.android.talkback.R; import com.android.utils.AccessibilityNodeInfoUtils; import com.android.utils.Role; import com.android.utils.StringBuilderUtils; /** Rule for processing pages of ViewPagers. */ public class RulePagerPage implements NodeSpeechRule { @Override public boolean accept(AccessibilityNodeInfoCompat node, AccessibilityEvent event) { if (node != null) { AccessibilityNodeInfoCompat parent = node.getParent(); if (parent != null) { try { int visibleChildren = 0; int totalChildren = parent.getChildCount(); for (int i = 0; i < totalChildren; ++i) { AccessibilityNodeInfoCompat child = parent.getChild(i); if (child != null) { if (child.isVisibleToUser()) { visibleChildren++; } child.recycle(); } } return Role.getRole(parent) == Role.ROLE_PAGER && visibleChildren == 1; } finally { parent.recycle(); } } } return false; } @Override public CharSequence format(Context context, AccessibilityNodeInfoCompat node, AccessibilityEvent event) { SpannableStringBuilder output = new SpannableStringBuilder(); final CharSequence nodeText = AccessibilityNodeInfoUtils.getNodeText(node); final CharSequence roleText; if (node.getRoleDescription() != null) { roleText = node.getRoleDescription(); } else { roleText = context.getString(R.string.value_pager_page); } StringBuilderUtils.append(output, nodeText, roleText); return output; } }