android textview 部分文字加颜色并可点击

package com.example.urlspantextviewclick;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Color;
import android.text.Html;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.method.LinkMovementMethod;
import android.text.style.ClickableSpan;
import android.text.style.ForegroundColorSpan;
import android.view.Menu;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

	private TextView t1;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		t1=(TextView)findViewById(R.id.txt);
		CharSequence str=getText(R.string.hello_world);
		SpannableString spannableString1 = new SpannableString(str);
		
		
		spannableString1.setSpan(new ClickableSpan(){
			@Override
			public void onClick(View widget) {
				Toast.makeText(getApplicationContext(), "who hit me", Toast.LENGTH_SHORT).show();
				
			}
		}, str.length()-3, str.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
		spannableString1.setSpan(new ForegroundColorSpan(Color.RED),str.length()-3, str.length(),Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
		t1.setText(spannableString1);
		t1.setMovementMethod(LinkMovementMethod.getInstance());
		//Html.fromHtml(source)
		//spannableString1.
		/**to see http://www.cnblogs.com/mxgsa/archive/2012/11/15/2760256.html
		 * Android TextView 支持的HTML标签
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      */
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}