在Android button上添加icon，让icon和文字都居中显示

参考这个链接：

http://gundumw100.iteye.com/blog/1205578

在xml文件里仍然有这个button，只不过不加icon和文字。

写了个函数：

private void addButtonIcon(Button btn, int icon_drawable, int text_id)
 {
  ImageGetter imgGetter = new ImageGetter() { 
            @Override 
            public Drawable getDrawable(String source) { 
                    Drawable drawable = null; 
                    drawable = getResources().getDrawable( 
                                    Integer.parseInt(source)); 
                    drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), 
                                    drawable.getIntrinsicHeight()); 
                    return drawable; 
            } 
     }; 
   
     StringBuffer sb = new StringBuffer();
     String text = "  " + getString(text_id); //add two space to look better
     sb.append("<img src=\"").append(icon_drawable).append("\"/>").append(text);
     Spanned span = Html.fromHtml(sb.toString(), imgGetter, null); 
     btn.setText(span); 
     sb = null;
 }

调用的时候：

exportBtn = (Button)findViewById(R.id.setting_export_btn);

   addButtonIcon(exportBtn, R.drawable.icon_export, R.string.setting_export);