android:为TextView添加样式——下划线，颜色，设置链接样式及前背景色

实现下划线及颜色设置：

public class AtActivity extends Activity {

LinearLayout ll;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ll=(LinearLayout)findViewById(R.id.ll);
        TextView tv=new TextView(this);
       
        tv.getPaint().setFlags(Paint.UNDERLINE_TEXT_FLAG);//下划线
        tv.setText("使用代码实现下划线样式");
        tv.setTextColor(Color.WHITE);
        ll.addView(tv);
       
        tv=new TextView(this);
       tv.setText(Html.fromHtml("<u>使用html实现下划线样式</u>"));
        ll.addView(tv);

    }
}

设置超链接样式：默认的超链接是蓝色的，我们现在设置成前景红色

public class AtActivity extends Activity {

LinearLayout ll;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ll=(LinearLayout)findViewById(R.id.ll);
        TextView tv=new TextView(this);
       
      
        tv.setText(Html.fromHtml("<a href=\"http://blog.csdn.net/CAIYUNFREEDOM\">自定义的超链接样式</a>"));
        tv.setMovementMethod(LinkMovementMethod.getInstance()); 
        CharSequence text  =  tv.getText();
        if (text instanceof Spannable){
         
               int  end  =  text.length();  
              Spannable sp  =  (Spannable)tv.getText();  
              URLSpan[] urls = sp.getSpans( 0 , end, URLSpan.class );  
            
              SpannableStringBuilder style = new  SpannableStringBuilder(text);  
              style.clearSpans(); // should clear old spans   
               for (URLSpan url : urls){    
                  URLSpan myURLSpan=   new  URLSpan(url.getURL());                       
             style.setSpan(myURLSpan,sp.getSpanStart(url),sp.getSpanEnd(url),Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); 
            style.setSpan(new ForegroundColorSpan(Color.RED), sp.getSpanStart(url), sp.getSpanEnd(url), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);//设置前景色为红色
               }
               tv.setText(style);  
        }
       
        ll.addView(tv);
         
        tv=new TextView(this);
        tv.setText(Html.fromHtml("<a href=\"http://blog.csdn.net/CAIYUNFREEDOM\">默认的超链接样式</a>"));
        tv.setMovementMethod(LinkMovementMethod.getInstance()); 
        ll.addView(tv);

    }
}