如何使用 android 无障碍服务来检测用户触摸了哪个视图？

Question

There's something that android TalkBack does that I want to do too. Specifically it's to identify the view that the user touched. I made this so far:

@Override
public void onAccessibilityEvent(AccessibilityEvent event) {
    if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_CLICKED) {

        //This only shows the package of the activity that the view is in, I want to identify the view itself
        Toast.makeText(this, "" + event.getSource().getPackageName(), Toast.LENGTH_LONG).show();
    }
}

Answer 1

You can get the view's id, but I think you can only access the AccessibilityNodeInfo associated with the view - I don't think you have access to the view itself. You can check the docs for more information on this.

    // kotlin code
    event.source.viewIdResourceName
    // or
    findFocusedViewInfo().viewIdResourceName

According to the docs :

Gets the fully qualified resource name of the source view's id.

Note: The primary usage of this API is for UI test automation and in order to report the source view id of an AccessibilityNodeInfo the client has to set the AccessibilityServiceInfo#FLAG_REPORT_VIEW_IDS flag when configuring the AccessibilityService.

Answer 2

the question is not clear, but maybe this will help you:-

@Override 
public void onAccessibilityEvent(AccessibilityEvent event) {
    AccessibilityNodeInfo source = event.getSource(); 

    if (source == null) {
        return; 
    } 
    List<AccessibilityNodeInfo> findAccessibilityNodeInfosByViewId = source.findAccessibilityNodeInfosByViewId("YOUR PACKAGE NAME:id/RESOURCE ID FROM WHERE YOU WANT DATA"); 

    if (findAccessibilityNodeInfosByViewId.size() > 0) {
        AccessibilityNodeInfo parent = (AccessibilityNodeInfo) findAccessibilityNodeInfosByViewId.get(0);
        // You can also traverse the list if required data is deep in view hierarchy. 
        String requiredText = parent.getText().toString();
        Log.i("Required Text", requiredText);
    }
}

also read this tutorial