Html 字体大小在 android 应用程序中不起作用

我是 android 新手，我正在开发小型 android 应用程序.在我的应用程序中，有一个按钮，其中包含多行文本和不同样式的文本.我是通过以下方式做到的:

I am new to android, and I am developing small android application.In my application one button is there which contains text with multiple lines and with different style of text. I did it in following ways :

<Button
           android:id="@+id/downloadButton"
       android:layout_width="200px"
       android:layout_height="65px"  
           android:background="@drawable/download_button"
       android:textColor="@android:color/white"
       android:layout_alignParentLeft="true"
      />

为了显示文本，我做了以下事情:

And for displaying text I did following thing:

Button download_button = (Button) findViewById(R.id.downloadButton);
    String download_styledText = "<font size='10'color='white'>"
            + "Download" + "</font> " + "<br />"+""+"<font size='7'color='#883e33'>" 
            + "Save it now!"+"</font>";
    download_button.setText(Html.fromHtml(download_styledText));

一切正常，唯一的问题是我的字体大小属性不起作用...如果我定义了大或小标签，其工作正常，但对于字体大小，它没有提供正确的输出...该怎么办?需要帮助...谢谢...

everything is working fine the only thing is that My font size property is not working... If I define tags like big or small its working fine but for font size its not giving proper output ... What to do ? Need help ... Thank you ...