Toolbar.setTitleTextAppearance implementation in AOSP

Toolbar#setTitleTextAppearance.java

/**
 * Sets the text color, size, style, hint color, and highlight color
 * from the specified TextAppearance resource.
 */
public void setTitleTextAppearance(Context context, @StyleRes int resId) {
    mTitleTextAppearance = resId;
    if (mTitleTextView != null) {
        mTitleTextView.setTextAppearance(context, resId);
    }
}