Java Text控件，如何设置字间距？

 java的话布局文件里面 

<Text
        ohos:id="$+id:text_helloworld"
        ohos:height="match_content"
        ohos:width="match_parent"
        ohos:padding="10vp"
        ohos:multiple_lines="true"
        ohos:line_height_num="3.5"
        ohos:letter_spacing="3.5"
        ohos:background_element="$graphic:background_ability_main"
        ohos:layout_alignment="horizontal_center"
        ohos:text="梳洗罢,独倚望江楼，过尽千帆皆不是，斜晖脉脉水悠悠"
        ohos:text_size="20fp"
        />

ohos:line_height_num="3.5"

 ohos:letter_spacing="3.5" 这两个属性

Java代码里

Text text = (Text)findComponentById(ResourceTable.Id_text_helloworld);
        text.setLetterSpacing(2.5f);
        text.setLineSpacing(2.5f, 2f);