android--设置TextView部分文字的颜色和背景(高亮显示)

public class HighLightActivity extends Activity {      
    String strs="我的心太乱了，给我点空白。";      
    TextView textview;      
    int start =3;      
    int end = 5;      
    /** Called when the activity is first created. */     
    @Override     
    public void onCreate(Bundle savedInstanceState) {      
        super.onCreate(savedInstanceState);      
        setContentView(R.layout.high_light);      
        textview=(TextView)findViewById(R.id.textview);      
        SpannableStringBuilder style=new SpannableStringBuilder(strs);      
        style.setSpan(new BackgroundColorSpan(Color.RED),start,end,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);      
        textview.setText(style);      
              
    }      
     
}

package com.justel.contact;      
     
import android.app.Activity;      
import android.graphics.Color;      
import android.os.Bundle;      
import android.text.Spannable;      
import android.text.SpannableStringBuilder;      
import android.text.style.BackgroundColorSpan;      
import android.text.style.ForegroundColorSpan;      
import android.widget.TextView;      
     
public class HighLightActivity extends Activity {      
    String strs="我的心太乱了，给我点空白。";      
    TextView textview;      
    int start =3;      
    int end = 5;      
    /** Called when the activity is first created. */     
    @Override     
    public void onCreate(Bundle savedInstanceState) {      
        super.onCreate(savedInstanceState);      
        setContentView(R.layout.high_light);      
        textview=(TextView)findViewById(R.id.textview);      
        SpannableStringBuilder style=new SpannableStringBuilder(strs);      
        style.setSpan(new BackgroundColorSpan(Color.RED),start,end,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);      
        style.setSpan(new ForegroundColorSpan(Color.RED),7,9,Spannable.SPAN_EXCLUSIVE_INCLUSIVE);      
        textview.setText(style);      
              
    }      
     
}

参数说明： 
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE 
API里面解释：Spans of type SPAN_EXCLUSIVE_EXCLUSIVE do not expand to include text inserted at either their starting or ending point. They can never have a length of 0 and are automatically removed from the buffer if all the text they cover is removed. 
即在原文本头或尾追加新文本的样式不受原文本样式影响，原文本高亮，新追加文本不高亮。
Spannable.SPAN_EXCLUSIVE_INCLUSIVE 
API里面解释：Non-0-length spans of type SPAN_INCLUSIVE_EXCLUSIVE expand to include text inserted at their ending point but not at their starting point. When 0-length, they behave like points. 
即在原文本尾追加新文本的样式受原文本样式影响，原来文本尾高亮，新追加文本也高亮。