的performAction为什么（AccessibilityNodeInfo.ACTION_CLEAR_FOCUS）总是EDITTEXT返回false？ [英] Why performAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS) always return false on editText?

问题描述

我要清除输入焦点从一个EditText在我的辅助服务上的特定行动。

I want to clear the input focus from an editText in my accessibility service on a specific action.

我得到输入焦点的节点，并尝试将其清除，但总的performAction返回false：

I get the node with the input focus and try to clear it but performAction always return false:

AccessibilityNodeInfo root = getRootInActiveWindow();
AccessibilityNodeInfo focus = root.findFocus(AccessibilityNodeInfo.FOCUS_INPUT);

if(focus != null){

    focus.getText(); //return the text in my input
    focus.isFocusable(); //return true
    focus.isFocused(); // return true
    focus.getActions(); //Return the bitmask that contain the Action_clear_focus

    boolean sucess = focus.performAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS);
    Log.v(TAG, "sucess = " + sucess); //Always return FALSE

}

为什么不能执行该操作？

Why the action cannot be performed?

推荐答案

如果你明确的重点从视图，该视图框架将试图将焦点回到屏幕上的第一个聚焦元素上。所以，如果在屏幕上一个聚焦元素，像一个EditText，它总是具有焦点 - 即使你调用clearFocus（）

If you clear focus from a view, the view framework will attempt to place focus back on the first focusable element on the screen. So, if there is a single focusable element on screen, like an EditText, it will always have focus -- even if you call clearFocus().

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