Change font of the floating label EditText and TextInputLayout

As of Design Library v23, you can use TextInputLayout#setTypeface().

This will set the typeface on both the expanded and floating hint.

Here is the feature request where it was discussed on b.android.com.

EDIT: The error view typeface was not being set, but is now fixed in v25.1.0.

Unfortunately, you'll have to use reflection to handle this.

The floating label is drawn by CollapsingTextHelper, which is an internal, package-private class and isn't setup to handle spans. So, using something like a custom TypefaceSpan won't work in this case.

Because this uses reflection, it isn't guaranteed to work in the future.

Implementation

final Typeface tf = Typeface.createFromAsset(getAssets(), "your_custom_font.ttf");final TextInputLayout til = (TextInputLayout) findViewById(R.id.yourTextInputLayout);til.getEditText().setTypeface(tf);try {    // Retrieve the CollapsingTextHelper Field    final Field cthf = til.getClass().getDeclaredField("mCollapsingTextHelper");    cthf.setAccessible(true);    // Retrieve an instance of CollapsingTextHelper and its TextPaint    final Object cth = cthf.get(til);    final Field tpf = cth.getClass().getDeclaredField("mTextPaint");    tpf.setAccessible(true);    // Apply your Typeface to the CollapsingTextHelper TextPaint    ((TextPaint) tpf.get(cth)).setTypeface(tf);} catch (Exception ignored) {    // Nothing to do}

Error view

If you needed to change the font of the error, you could do one of two things:

1. Use Reflection grab the error TextView and apply the Typeface much like before
2. Use a custom span. Unlike the floating label, the error view used by TextInputLayout is just a TextView, so it's able to handle spans.

Using reflection

final Field errorField = til.getClass().getDeclaredField("mErrorView");errorField.setAccessible(true);((TextView) errorField.get(til)).setTypeface(tf);

Using a custom span

final SpannableString ss = new SpannableString("Error");ss.setSpan(new FontSpan(tf), 0, ss.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);til.setError(ss);private static final class FontSpan extends MetricAffectingSpan {    private final Typeface mNewFont;    private FontSpan(Typeface newFont) {        mNewFont = newFont;    }    @Override    public void updateDrawState(TextPaint ds) {        ds.setTypeface(mNewFont);    }    @Override    public void updateMeasureState(TextPaint paint) {        paint.setTypeface(mNewFont);    }}

Results

The font I'm using is Smoothie Shoppe.

I'm using new MaterialComponents theme and none of the answers helped me.

Had to play with styles and themes on my own. Will post a chunk of styles here in case somebody faces the same issue.

<style name="AppTheme" parent="Theme.MaterialComponents.Light.NoActionBar">  ...  <item name="textInputStyle">@style/CustomFontTextInputLayout</item></style>  <!-- region TextInputLayout & TextInputEditText styles --><style name="TextInputLayout.OutlineBox.CustomFont" parent="Widget.MaterialComponents.TextInputLayout.OutlinedBox">  <item name="android:theme">@style/ThemeOverlay.TextInputEditText.OutlinedBox.CustomFont</item></style><style name="ThemeOverlay.TextInputEditText.OutlinedBox.CustomFont" parent="ThemeOverlay.MaterialComponents.TextInputEditText.OutlinedBox">  <item name="editTextStyle">@style/TextInputEditText.OutlinedBox.CustomFont</item></style><style name="TextInputEditText.OutlinedBox.CustomFont" parent="Widget.MaterialComponents.TextInputEditText.OutlinedBox">  <item name="android:fontFamily">@font/my_font</item></style><style name="CustomFontTextInputLayout" parent="Widget.Design.TextInputLayout">  <item name="hintTextAppearance">@style/TextInputLayoutHintText</item>  <item name="helperTextTextAppearance">@style/TextInputLayoutHelperText</item>  <item name="errorTextAppearance">@style/TextInputLayoutErrorText</item></style><style name="TextInputLayoutHintText" parent="TextAppearance.Design.Hint">  <item name="android:fontFamily">@font/my_font</item></style><style name="TextInputLayoutHelperText" parent="TextAppearance.Design.HelperText">  <item name="android:fontFamily">@font/my_font</item></style><style name="TextInputLayoutErrorText" parent="TextAppearance.Design.Error">  <item name="android:fontFamily">@font/my_font</item></style><!-- endregion -->

Then in xml layout:

<android.support.design.widget.TextInputLayout    style="@style/TextInputLayout.OutlineBox.CustomFont"    android:layout_width="match_parent"    android:layout_height="wrap_content">    <android.support.design.widget.TextInputEditText        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:hint="@string/first_name"/></android.support.design.widget.TextInputLayout>

Here's the result: