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：

Java代码  

1. public class HighLightActivity extends Activity {   
2.     String strs="我的心太乱了，给我点空白。";   
3.     TextView textview;   
4.     int start =3;   
5.     int end = 5;   
6.     /** Called when the activity is first created. */  
7.     @Override  
8.     public void onCreate(Bundle savedInstanceState) {   
9.         super.onCreate(savedInstanceState);   
10.         setContentView(R.layout.high_light);   
11.         textview=(TextView)findViewById(R.id.textview);   
12.         SpannableStringBuilder style=new SpannableStringBuilder(strs);   
13.         style.setSpan(new BackgroundColorSpan(Color.RED),start,end,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);   
14.         textview.setText(style);   
15.            
16.     }   
17.   
18. }  

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);            }}

显示效果：



同时设置文字和背景高亮显示：

Java代码  

1. package com.justel.contact;   
2.   
3. import android.app.Activity;   
4. import android.graphics.Color;   
5. import android.os.Bundle;   
6. import android.text.Spannable;   
7. import android.text.SpannableStringBuilder;   
8. import android.text.style.BackgroundColorSpan;   
9. import android.text.style.ForegroundColorSpan;   
10. import android.widget.TextView;   
11.   
12. public class HighLightActivity extends Activity {   
13.     String strs="我的心太乱了，给我点空白。";   
14.     TextView textview;   
15.     int start =3;   
16.     int end = 5;   
17.     /** Called when the activity is first created. */  
18.     @Override  
19.     public void onCreate(Bundle savedInstanceState) {   
20.         super.onCreate(savedInstanceState);   
21.         setContentView(R.layout.high_light);   
22.         textview=(TextView)findViewById(R.id.textview);   
23.         SpannableStringBuilder style=new SpannableStringBuilder(strs);   
24.         style.setSpan(new BackgroundColorSpan(Color.RED),start,end,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);   
25.         style.setSpan(new ForegroundColorSpan(Color.RED),7,9,Spannable.SPAN_EXCLUSIVE_INCLUSIVE);   
26.         textview.setText(style);   
27.            
28.     }   
29.   
30. }  

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);            }}

显示效果：



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。