EditText getHint() returns null when using design

问题:

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

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);

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");

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

Previously related issue here!

回答1:

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

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();

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

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

Happy codding! :)

回答2:

Hint is linked with its's parent layout

((TextInputLayout)view.getParent()).getHint()

回答3:

This is fixed in design support 23.0.0 but the project has to be compiled for api 23.

build.gradle

android {
    compileSdkVersion 23
    buildToolsVersion '23'
    ....
}
dependencies{
    compile 'com.android.support:appcompat-v7:23.0.0'
...
}

Setting the hint on the EditText like before:

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

Now adding an extra character to the hint:

TextInputLayout inputField = (TextInputLayout) findViewById(R.id.inputLayout);
String hint = String.format("%s *", inputField.getHint());
inputField.setHint(hint);