<ImageButtonandroid:id="@+id/icon"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerVertical="true"android:layout_marginLeft="8dp"android:layout_marginRight="8dp"android:background="@drawable/trans"android:contentDescription="添加图片按钮"android:src="@drawable/photo_pack" />

ImageView rightMoreButton = getRightMoreButton();
if (rightMoreButton != null) {getRightMoreButton().setContentDescription("更多");
}

//首先声明一个无障碍辅助类的变量
protected XXXTouchHelper touchHelper;

//然后初始化无障碍辅助类，初始化的时机可以在构造方法中，也可以在onMeasure方法中if (isAccessibilityEnable()) {//当开启无障碍设置时才执行if(touchHelper==null) {touchHelper = new XXXTouchHelper(this);//无障碍委托ViewCompat.setAccessibilityDelegate(this, touchHelper);//开启无障碍ViewCompat.setImportantForAccessibility(this, ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_YES);}}

/**
**开始实现这个无障碍辅助类
**/
protected class XXXTouchHelper extends ExploreByTouchHelper {

       HashMap<Integer, SubAreaShell> areaShells = new HashMap<Integer, SubAreaShell>(2);//存放找到的虚拟控件public XXXTouchHelper(View host) {super(host);}/*** 如果自绘view中含有多个控件，每个控件相当于一个虚拟节点，这里根据x,y坐标获取对应的虚拟节点的编号* 这里的编号是你自己定的，比如说我这个XXXView里面有两个自定义控件XXXTextArea和XXXSinglePicArea* 且XXXTextArea出现在XXXPicArea的上方，那么XXXTextArea的序号就为0，XXXSinglePicArea的序号就为1* @param x* @param y* @return 找不到虚拟节点就返回ExploreByTouchHelper.INVALID_ID*/@Overrideprotected int getVirtualViewAt(float x, float y) {//这里写你自己的代码逻辑，判断x,y坐标被包含在那个虚拟节点里面,我这里简单写个示例代码SubAreaShell area = findArea(x, y);if (area != null) {if(area.getSubArea() instanceof XXXTextArea){return 0;}else if(area.getSubArea() instanceof XXXSinglePicArea){return 1;}}return ExploreByTouchHelper.INVALID_ID;}/*** 这个方法的命名使人误会，其实它主要的作用就是把你上面找到的虚拟节点的编号放进List中* @param virtualViewIds*/@Overrideprotected void getVisibleVirtualViews(List<Integer> virtualViewIds) {//如果实际情况比较复杂的话，这里可以灵活变化下if (areaShells.size() > 2){ //areaShells只存储两个元素areaShells.clear();}for (SubAreaShell subAreaShell : mAreasList) {//mAreasList是外面类的一个变量，负责把各个view收集起来SubArea subArea = subAreaShell.getSubArea();if (subArea instanceof XXXTextArea) {if (subArea.getType() == ViewArea.TYPE_NORMAL_SUMMARY) {virtualViewIds.add(0);//主要areaShells.put(0, subAreaShell);}} else if (subArea instanceof XXXSinglePicArea) {virtualViewIds.add(1);//主要areaShells.put(1, subAreaShell);}}}/*** 给虚拟view填充事件，即是给对应的虚拟控件设置文字描述* @param virtualViewId* @param event*/@Overrideprotected void onPopulateEventForVirtualView(int virtualViewId, AccessibilityEvent event) {if(virtualViewId == 0){event.setContentDescription("我是文字");}else{event.setContentDescription("我是图片");}}/*** 给虚拟view填充节点，即是给虚拟节点设置文字描述和无障碍边框* @param virtualViewId* @param node*/@Overrideprotected void onPopulateNodeForVirtualView(int virtualViewId, AccessibilityNodeInfoCompat node) {//node.setContentDescription，node.setBoundsInParent必须要设置，不然会报异常，后面我会说if(virtualViewId == 0){node.setContentDescription("我是文字");}else{node.setContentDescription("我是图片");}node.addAction(AccessibilityNodeInfoCompat.ACTION_CLICK);//给虚拟节点添加无障碍点击动作Rect bound = getBoundsForIndex(virtualViewId);//根据上面放进来的虚拟id寻找对应区域的无障碍边框if (bound.isEmpty()) {bound = new Rect(0, 0, 1, 1);    //很无奈的一种保护，防止下一步crash}node.setBoundsInParent(bound);//必须保证bound不是empty,不然会报错}/*** 计算每一个区域的无障碍边框* @param virtualViewId* @return*/public Rect getBoundsForIndex(int virtualViewId) {Rect rect = new Rect();SubAreaShell subAreaShell;SubArea subArea;//这是我的逻辑代码，仅供参考if (virtualViewId != ExploreByTouchHelper.INVALID_ID) {if (virtualViewId == 0) {subAreaShell = areaShells.get(0);if (subAreaShell == null){return rect;    //返回一个空Rect}subArea = subAreaShell.getSubArea();if (subArea instanceof XXXTextArea) {XXXTextArea textArea = (XXXTextArea) subArea;rect.left = 0;rect.top = 0;rect.right = XXXView.this.getWidth();rect.bottom = subAreaShell.getTop() + textArea.getHeight();}} else {subAreaShell = areaShells.get(1);if (subAreaShell == null){return rect;    //返回一个空Rect}subArea = subAreaShell.getSubArea();if (subArea instanceof XXXSinglePicArea) {XXXSinglePicArea singlePicArea = (XXXSinglePicArea) subArea;rect.left = singlePicArea.getPaddingLeft();rect.top = singlePicArea.getMarginTop();rect.right = rect.left + singlePicArea.getWidth();rect.bottom = rect.top + singlePicArea.getHeight();}}}return rect;}/*** 提供无障碍交互* @param virtualViewId* @param action* @param arguments* @return*/@Overrideprotected boolean onPerformActionForVirtualView(int virtualViewId, int action, Bundle arguments) {switch(action){case AccessibilityNodeInfoCompat.ACTION_CLICK:onFeedContentViewClick(virtualViewId);return true;}return false;}}protected void onFeedContentViewClick(int virtualViewId) {super.playSoundEffect(SoundEffectConstants.CLICK);if(touchHelper==null)return;touchHelper.invalidateVirtualView(virtualViewId);touchHelper.sendEventForVirtualView(virtualViewId, AccessibilityEvent.TYPE_VIEW_CLICKED);}/*** 分发触摸事件* @param event* @return*/@Overrideprotected boolean dispatchHoverEvent(MotionEvent event) {if(FeedEnv.isAccessibilityEnable() &&touchHelper!=null && touchHelper.dispatchHoverEvent(event)){return true;}return super.dispatchHoverEvent(event);}

1.
要实现ExploreByTouchHelper里面的这几个方法，我例子里面都有注释啦
getVirtualViewAt
getVisibleVirtualViews
onPopulateEventForVirtualView
onPopulateNodeForVirtualView
onPerformActionForVirtualView
外加一个
dispatchHoverEvent

2.
请注意以以下的关键点，否则要跪，虚拟节点实现无障碍本来就是个变幻莫测的东西
a.在getVirtualViewAt()方法中获取对应虚拟节点的rect编号的时候，这个rect要和在populateNodeVirtualView中设置的setBoundsInParent()里面的rect（大小）一致，否则无障碍模式的点击操作不起作用！b.一定要在onPopulateNodeForVirtualView中设置node.setContentDescription和node.setBoundsInParent，不然会抛异常，不信你看源码
if(event.getText().isEmpty() && event.getContentDescription() == null) {throw new RuntimeException("Callbacks must add text or a content description in populateEventForVirtualViewId()");}
node.getBoundsInParent(this.mTempParentRect);
if(this.mTempParentRect.isEmpty()) {throw new RuntimeException("Callbacks must set parent bounds in populateNodeForVirtualViewId()");}c.node.setBoundsInParent(bound);必须保证bound不是empty，不然会挂，不信你看源码是怎么抛异常的
if(this.mTempParentRect.isEmpty()) {throw new RuntimeException("Callbacks must set parent bounds in populateNodeForVirtualViewId()");}下面是活生生的例子啊，同志们
错误类型：java.lang.RuntimeException
Crash详情：
java.lang.RuntimeException: Callbacks must set parent bounds in populateNodeForVirtualViewId()
android.support.v4.widget.ExploreByTouchHelper.createNodeForChild(ProGuard:389)
android.support.v4.widget.ExploreByTouchHelper.createNode(ProGuard:318)
android.support.v4.widget.ExploreByTouchHelper.access$100(ProGuard:52)
android.support.v4.widget.ExploreByTouchHelper$ExploreByTouchNodeProvider.createAccessibilityNodeInfo(ProGuard:710)