为一个TextView中的某个单词设置单击事件

为TextView中的字符串“dai ha ha dai lingdaidaing“中的dai单词设置单击事件

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
    	super.onCreate(savedInstanceState);
    	setContentView(R.layout.activity_main);
    	TextView textView = (TextView) findViewById(R.id.tv);
    	String str = "dai ha ha dai lingdaidaing";
    	SpannableStringBuilder ssb = new SpannableStringBuilder(str);
    	Pattern pattern = Pattern.compile("dai");
    	Matcher matcher = pattern.matcher(str);
    	while(matcher.find()) {
    		String group = matcher.group();
    		ClickableSpan cs = new MyClickableSpan(group);
    		ssb.setSpan(cs, matcher.start(), matcher.end(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
    	} 
    	textView.setText(ssb);
    	textView.setMovementMethod(LinkMovementMethod.getInstance());
    }

    class MyClickableSpan extends ClickableSpan{
    	private String group;
    	
    	public MyClickableSpan(){}
    	public MyClickableSpan(String group){
    		this.group = group;
    	}
    	
		@Override
		public void onClick(View widget) {
			Toast.makeText(getApplicationContext(), group, 0).show();
		}
    }
}