title: How to make floating label bold for TextInputLayout
body: <p>I have a <code>TextInputLayout</code>. I try to apply custom <code>hintTextAppearance</code> style</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      android:orientation="vertical"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:paddingLeft="@dimen/wizard_horizontal_margin"
      android:paddingRight="@dimen/wizard_horizontal_margin"
      android:paddingTop="@dimen/wizard_vertical_margin"
      android:paddingBottom="@dimen/wizard_vertical_margin"&gt;
  
      &lt;TextView
          android:paddingBottom="@dimen/wizard_vertical_margin"
          android:text="What's your email address?"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:textColor="?attr/wizardTextViewColor"
          android:textSize="18sp"
          android:id="@+id/text_view" /&gt;
  
      &lt;android.support.design.widget.TextInputLayout
          app:hintTextAppearance="@style/WizardTextInputLayout"
          android:id="@+id/text_input_layout"
          android:layout_width="match_parent"
          android:layout_height="wrap_content" &gt;
          &lt;EditText
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:inputType="textEmailAddress"
              android:hint="Email address"
              android:id="@+id/email_edit_text" /&gt;
      &lt;/android.support.design.widget.TextInputLayout&gt;
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>I try to make the text bold by applying the following custom style.</p>
  
  <pre><code>&lt;style name="WizardTextInputLayout" parent="TextAppearance.Design.Hint"&gt;
      &lt;item name="android:textStyle"&gt;bold&lt;/item&gt;
  &lt;/style&gt;
  </code></pre>
  
  <p>However, it looks no different before &amp; after applying the custom style.</p>
  
  <h2>Before custom <code>hintTextAppearance</code> style</h2>
  
  <p><a href="https://i.stack.imgur.com/8tLKC.png" rel="noreferrer"><img src="https://i.stack.imgur.com/8tLKC.png" alt="enter image description here"></a></p>
  
  <h2>After custom <code>hintTextAppearance</code> style</h2>
  
  <p><a href="https://i.stack.imgur.com/rR0Vb.png" rel="noreferrer"><img src="https://i.stack.imgur.com/rR0Vb.png" alt="enter image description here"></a></p>
  
  <p>I can confirm the styling works. As, if I add <code>android:textSize</code> attribute in <code>WizardTextInputLayout</code> style, I can see there is change on floating label text size.</p>
  
  <p>But, why making the floating label text bold doesn't work? Anything I can try out to make the floating label text bold?</p>