Android 如何获取当前Whatsapp窗口的名称'；辅助功能服务中的标题栏？

我正在为Whatsapp提供无障碍服务。每当用户按下输入框时，我想知道当前的标题栏，其中通常有收件人whatsapp用户或whatsapp组的名称：

我对获取字符串

testuser

以下是我的xml：

<accessibility-service xmlns:android="http://schemas.android.com/apk/res/android"
    android:accessibilityEventTypes="typeViewClicked|typeViewFocused"
    android:packageNames="com.whatsapp"
    android:accessibilityFeedbackType="feedbackSpoken"
    android:notificationTimeout="100"
    android:settingsActivity="com.example.android.apis.accessibility.TestBackActivity"
    android:canRetrieveWindowContent="true" />

我尝试获取当前窗口或父窗口并检查其标题，两者似乎都为空：

AccessibilityNodeInfo currentNode = event.getSource();
AccessibilityNodeInfo parentNode = nodeInfo.getParent();
AccessibilityWindowInfo currentWindow = currentNode.getWindow();
AccessibilityWindowInfo parentWindow = parentNode.getWindow();
// currentWindow.getTitle();
// parentWindow.getTitle();

---

我已经编写了一个库来帮助使用AccessibilityNodeInfos和其他Android AccessibilityAPI进行工作。几乎完成了，需要记录在案。但是，使用此库，您可以这样完成：

在主服务中（允许访问根辅助功能节点），执行以下操作

A11yNodeInfo nodeInfo = A11yNodeInfo.wrap(getRootInActiveWindow());

A11yNodeInfo result = nodeInfo.visit(new A11yNodeInfo.OnVisitListener() {
   @Override
   public boolean onVisit(A11yNodeInfo nodeInfo) {
       A11yNodeInfoMatcher matcher = new A11yNodeInfoMatcher();
       //Add properties to the matcher as needed.  I'm just guessing here!

       return matcher.matches(nodeInfo);
   }
});

如果要查看该元素的可访问性属性，还可以打印整个可访问性树：

Log.d("Tag", A11yNodeInfo.wrap(getRootInActiveWindow).toViewHeirarchy());

这对我很有效：

AccessibilityNodeInfo nodeInfo = event.getSource();

try
{
 List<AccessibilityNodeInfo> findAccessibilityNodeInfosByViewId = nodeInfo.findAccessibilityNodeInfosByViewId("com.whatsapp:id/conversation_contact_name");

 if (findAccessibilityNodeInfosByViewId.size() > 0)
 {
  AccessibilityNodeInfo parent = (AccessibilityNodeInfo) findAccessibilityNodeInfosByViewId.get(0);

  String contactName = parent.getText().toString();

  if (contactName != null && !contactName.isEmpty()) // do your stuff here, contactName contains the chat contact name!

 }
}
catch(Exception contactName) {}

---

我想你忘了链接到你的图书馆了

AccessibilityNodeInfo nodeInfo = event.getSource();

try
{
 List<AccessibilityNodeInfo> findAccessibilityNodeInfosByViewId = nodeInfo.findAccessibilityNodeInfosByViewId("com.whatsapp:id/conversation_contact_name");

 if (findAccessibilityNodeInfosByViewId.size() > 0)
 {
  AccessibilityNodeInfo parent = (AccessibilityNodeInfo) findAccessibilityNodeInfosByViewId.get(0);

  String contactName = parent.getText().toString();

  if (contactName != null && !contactName.isEmpty()) // do your stuff here, contactName contains the chat contact name!

 }
}
catch(Exception contactName) {}

<?xml version="1.0" encoding="utf-8"?>
<accessibility-service xmlns:android="http://schemas.android.com/apk/res/android"
    android:accessibilityFeedbackType="feedbackAllMask"
    android:accessibilityFlags="flagIncludeNotImportantViews|flagReportViewIds"
    android:canRetrieveWindowContent="true"
    android:packageNames="com.whatsapp"
/>

@Override
public void onServiceConnected()
{
 AccessibilityServiceInfo info=getServiceInfo();
 info.eventTypes = AccessibilityEvent.TYPES_ALL_MASK;
 this.setServiceInfo(info);
}