如何在辅助功能服务中获取当前Whatsapp窗口标题栏的名称？

Question

我正在为Whatsapp开发一个辅助功能服务。每当用户按下输入框时，我想知道当前标题栏通常有收件人whatsapp用户或whatsapp组的名称：

我有兴趣获取该字符串Test User

这是我的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" />

这是我的代码：

public void onAccessibilityEvent(AccessibilityEvent event) {
    final int eventType = event.getEventType();
    String eventText = null;
    switch(eventType) {
        case AccessibilityEvent.TYPE_VIEW_CLICKED:
            eventText = "Clicked: ";
            break;
        case AccessibilityEvent.TYPE_VIEW_FOCUSED:
            eventText = "Focused: ";
            break;
    }
    eventText = eventText + event.getContentDescription();
    Log.d(TAG, "onAccessibilityEvent: " + eventText);
    if (eventText.toLowerCase().contains("type a message")) {
        // access the title bar name/string here
    }
}

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();

Answer 1

我编写了一个库来帮助使用AccessibilityNodeInfos和其他Android Accessibility API进行处理。它几乎完成了，需要记录。但是，使用这个库你可以这样做：

在主服务中（为了允许访问root辅助功能节点），请执行以下操作。

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);
   }
});

如果要浏览该元素的辅助功能属性，还可以打印出整个辅助功能树：

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

https://github.com/chriscm2006/Android-Accessibility-Utilities

Answer 2

这对我有用：

error: implicit instantiation of undefined template 'TD<int>'

我的AndroidManifest.xml

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) {}

我的onServiceConnected方法：

<?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"
/>