使用设计支持库时 EditText getHint() 返回 null [英] EditText getHint() returns null when using design support library

问题描述

将 EditText 与 Design lib(版本 22.2.1)结合使用时，TextInputLayout 以编程方式获取提示返回 null.

When using EditText in combination with Design lib's (ver 22.2.1) TextInputLayout getting hint programmatically returns null.

我正在尝试以编程方式将星号*"附加到必填字段，因此 EditText.getHint() 但它返回 null 的事实在这种情况下是一个问题.

I'm trying to append asterisk '*' to a mandatory field programmatically, hence EditText.getHint() but the fact that it returns null is an issue in this case.

EditText editText = (EditText) findViewById(R.id.edit2);
String hint = String.format("%s *", editText.getHint());
editText.setHint(hint);

一个简单的代码说明:布局.xml:

A simple code illustration: Layout.xml:

<android.support.design.widget.TextInputLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    <EditText
            android:id="@+id/edit2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/hello_world"
            android:inputType="text"/>
</android.support.design.widget.TextInputLayout>

Java:

EditText editText = (EditText) findViewById(R.id.edit2);
if (editText.getHint() == null) throw new AssertionError("Hint should not be null");

依赖:编译'com.android.support:design:22.2.1'

dependency: compile 'com.android.support:design:22.2.1'

以前相关的问题 这里！

推荐答案

实际上提示移动到 EditText 视图周围的父视图 TextInputLayout:

Actually the hint moves to the parent view TextInputLayout that surrounds the EditText view:

你可以得到这样的提示:

You can get the hint like this:

android.support.design.widget.TextInputLayout parent = (android.support.design.widget.TextInputLayout) yourEditText.getParent();
String hint = parent.getHint().toString();

如果你想添加 * 让它像这样:

And if you want to add * make it like this:

parent.setHint(parent.getHint() + "*");

编码愉快！:)

这篇关于使用设计支持库时 EditText getHint() 返回 null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！