仅可使用手写笔单击的按钮 [英] button clickable only with a stylus

问题描述

我有一个按钮，只希望用手写笔单击.我使用了setClickable方法来启用或禁用按钮的单击，但是我怎么能只用笔单击呢?该按钮仅在MotionEvent.TOOL_TYPE_STYLUS

I have a button that I would like clickable only by a stylus. I used the method setClickable to enable or disable the click on the button, but how can I do that is clickable only with a pen? the button should be clickable only when MotionEvent.TOOL_TYPE_STYLUS

我该怎么办?

推荐答案

您可以覆盖 Button 的 onTouchListener ，并在未执行touch事件时立即返回通过 TOOL_TYPE_STYLUS .要检索此信息，可以使用

you could override the Button's onTouchListener, and return immediately it the touch event is not performed through TOOL_TYPE_STYLUS. To retrieve this information, you can use

getToolType(int pointerX)

从文档

获取给定指针索引的指针的工具类型

Gets the tool type of a pointer for the given pointer index

如果返回 TOOL_TYPE_STYLUS ，则只需检查 MotionEvent 中的 ACTION_DOWN / ACTION_UP ，然后调用 performClick().例如

if it returns TOOL_TYPE_STYLUS, then you can simply check the MotionEvent for the ACTION_DOWN/ACTION_UP, and call performClick(). E.g.

b.setOnTouchListener(new OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            if (event.getToolType(0) == MotionEvent.TOOL_TYPE_STYLUS) {
                if (event.getAction() == MotionEvent.ACTION_UP ) {
                    performClick();
                    return true;
                }
            }
            return false;
        }
});

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