Android onxml中的onfocuschange [英] Android onfocuschange in xml

问题描述

我有一个Android应用程序，在xml布局文件中，我有类似以下内容:

I have an Android app, and in the xml layout file I have something like this:

    <CheckBox
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/checkBoxDone"
    android:checked="false"
    android:clickable="true"
    android:onClick="doneCheckBoxClicked" />

然后在我实现的Java代码中

Then in the java code I implemented

    public void doneCheckBoxClicked(View v) { ...}

我可以使用类似的方法进行焦点更改操作吗?在xml中有类似

Can I use similar approach for focus changing actions. Have in the xml something like

android:onFocusChanged="editTextFieldFocusChanged"

，然后使用Java代码:

and then in java code:

public void editTextFieldFocusChanged(View v, boolean hasFocus) { ...}

还是没有办法在xml中执行onFocusChange?

Or there is no way to do onFocusChange in the xml?

推荐答案

我们无法在XML文件(如onclick侦听器)中设置editext的焦点更改侦听器.我们只需要在Java文件中完成该操作即可.

We can't set focus change listener of editext in xml file like onclick listener. We need to do it in Java file only.

edit_Text.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
    if(hasFocus){
        Toast.makeText(getApplicationContext(), "got the focus", Toast.LENGTH_LONG).show();
    }else {
        Toast.makeText(getApplicationContext(), "lost the focus", Toast.LENGTH_LONG).show();
    }
   }
});

这篇关于Android onxml中的onfocuschange的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！