問題描述

將 EditText 與 Design lib(版本 22.2.1)結合使用時，TextInputLayout 以編程方式獲取提示返回 null.

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

我正在嘗試以編程方式將星號*"附加到必填字段，因此 EditText.getHint() 但它返回 null 的事實在這種情況下是一個問題.

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);

一個簡單的代碼說明: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");

依賴:編譯'com.android.support:design:22.2.1'

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

以前相關的問題 這里！

推薦答案

實際上提示移動到 EditText 視圖周圍的父視圖 TextInputLayout:

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

你可以得到這樣的提示:

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 * 讓它像這樣:

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

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

編碼愉快！:)

這篇關于使用設計支持庫時 EditText getHint() 返回 null的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！