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

当将EditText与Design lib的(版本22.2.1)结合使用时，以编程方式获取提示的TextInputLayout将返回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()，但是在这种情况下，它返回null的事实是一个问题.

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: Layout.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");

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

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

先前相关的问题这里！

推荐答案

实际上，提示移到包围EditText视图的父视图TextInputLayout:

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

您可以得到如下提示:

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

如果要添加*，请使其如下:

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

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

祝您生日快乐！ :)

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