android--设置TextView部分文字的颜色和背景(高亮显示)

设置部分文字背景高亮显示： 

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);

}

}

 

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。