android--设置TextView部分文字的颜色和背景(高亮显示)

转载自：http://dev.10086.cn/cmdn/wiki/index.php?edition-view-6663-1.html

同时设置文字和背景高亮显示： 

    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。