Android 中设置EditText输入框提示文本hint的字体大小

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".CustomHintActivity">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal">
        <TextView
            android:layout_width="0dp"
            android:layout_height="50dp"
            android:layout_weight="1"
            android:gravity="center|end"
            android:text="用户名称："
            android:textColor="@color/black"
            android:textSize="15sp" />
        <EditText
            android:id="@+id/editText"
            android:layout_width="0dp"
            android:layout_height="50dp"
            android:layout_weight="3"
            android:textSize="13sp" />
    </LinearLayout>
</LinearLayout>

public class CustomHintActivity extends AppCompatActivity {
    private EditText editText;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_custom_hint);
        editText = findViewById(R.id.editText);
        SpannableString spannableString = new SpannableString("请输入用户名称");
        //设置文字绝对大小
        //第一个参数：size默认单位为px
        //第二个参数：当为true时，单位为dip; 为false时,单位为px
        AbsoluteSizeSpan absoluteSizeSpan = new AbsoluteSizeSpan(13, true);
        spannableString.setSpan(absoluteSizeSpan, 0, spannableString.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        //设置提示文本
        editText.setHint(spannableString);
    }
}