TextView是用来显示文本的，有时需要给TextView中的个别字设置为超链接，或者设置个别字的颜色、字体等，那就需要用到Spannable对象，可以借助Spannable对象实现以上设置
myTextView = (TextView) this.findViewById(R.id.myTextView);
  //创建一个 SpannableString对象   
  SpannableString sp = new SpannableString("这句话中有百度超链接,有高亮显示，这样，或者这样，还有斜体.");   
  //设置超链接   
  sp.setSpan(new URLSpan("http://www.baidu.com"), 5, 7,   
  Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);   
  //设置高亮样式一   
  sp.setSpan(new BackgroundColorSpan(Color.RED), 17 ,19,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);   
  //设置高亮样式二   
  sp.setSpan(new ForegroundColorSpan(Color.YELLOW),20,24,Spannable.SPAN_EXCLUSIVE_INCLUSIVE);   
  //设置斜体   
  sp.setSpan(new StyleSpan(android.graphics.Typeface.BOLD_ITALIC), 27, 29, Spannable.SPAN_EXCLUSIVE_INCLUSIVE);   
  //SpannableString对象设置给TextView   
  myTextView.setText(sp);   
  //设置TextView可点击   

  myTextView.setMovementMethod(LinkMovementMethod.getInstance()); 

关键方法：
public void setSpan (Object what, int start, int end, int flags)

下面是一个详细的例子：

public class TextViewJump2Activity extends Activity {
	private TextView mClickableText;
	
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        LinearLayout layout = new LinearLayout(this);
		mClickableText = new TextView(this);
		mClickableText.setClickable(true);
		mClickableText.setTextSize(20);
		layout.addView(mClickableText);
		setContentView(layout);
		mClickableText.setText(getClickableSpan());
		mClickableText.setMovementMethod(LinkMovementMethod.getInstance());
	}
	private SpannableString getClickableSpan() {
		View.OnClickListener l = new View.OnClickListener() {
			public void onClick(View v) {
				Toast.makeText(TextViewJump2Activity.this, "Click Success", Toast.LENGTH_SHORT).show();
				//在这里就可以做跳转到activity或者弹出对话框的操作了
			}
		};
		
		SpannableString spanableInfo = new SpannableString("This is a test, Click Here!");
		int start = 16;
		int end = spanableInfo.length();
		spanableInfo.setSpan(new Clickable(l), start, end,
		Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
		return spanableInfo;
	}
}