这是一篇好文章，我转来收藏，技术的最高境界是分享。

最近在搞android 新浪微博客户端，有一些心得分享
弄android客户端表情功能可以用以下思路
1.首页把新浪的表情下载到本地一文件夹种，表情图片的命名要用新浪微博表情原来的命名
比如新浪的害羞表情是shame.gif 那么你在本地也得命名为shame.gif,命名相同主要是为了能够匹配表情对应的code.
2.把本地的表情都放进android的资源文件里----drawable下面
3.访问新浪的表情接口(新浪返回的数据类型有json和xml两种，本人用xml)，把返回的信息，利用xml解析器解析出来的信息储存在一个Emotion.java的bean里，这样就可以根据Emotion.java的code找到一一对应的资源表情图片了
4.实现一个可以让用户选择的表情界面，本人用GridView实现
5.实现点击GridView的每一个item，处理根据item的index查找对应的表情code，然后再把code利用正则把code转换为相对应的表情图片，最后表情插入EditText进行发送。

下面是具体的实现过程

1.把新浪表情图片下载到本地的实现如下：(这个可以建一个java工程进行下载)

public void getFriendList() throws Exception {
BlogReleaseServiceImpl service = new BlogReleaseServiceImpl();
List<Emotions> list = service.getEmotion();
for (Emotions emotions : list) {
String path = emotions.getUrl();
String filename = path.substring(path.lastIndexOf("/") + 1,path.length());
URL url =  new URL(path);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setRequestMethod("GET");
conn.setReadTimeout(5 * 1000);
if(conn.getResponseCode() == 200){
InputStream is = conn.getInputStream();
byte[] data = readStream(is);
File file = new File("f: \\sina_images\\" + filename);
FileOutputStream fs = new FileOutputStream(file);
fs.write(data);
fs.close();
}else{
System.out.println("请求失败");
}
}
}
public byte[] readStream(InputStream is) throws Exception {
ByteArrayOutputStream os = new ByteArrayOutputStream();
byte[] buffer = new byte[2048];
int len = 0;
while((len = is.read(buffer)) != -1){
os.write(buffer,0,len);
}
is.close();
return os.toByteArray();
}

2:把本地的表情都放进android的资源文件里----drawable下面(这个就不用多说了，直接选取所有文件复制就行了)

3:

3.1访问新浪的表情接口，把返回的信息如下：

       <emotion>
<phrase>[嘻嘻]</phrase>
<type>face</type>
<url>http://img.t.sinajs.cn/t35/style/images/common/face/ext/normal/c2/tooth.gif
</url>
<is_hot>false</is_hot>
<is_common>true</is_common>
<order_number>0</order_number>
<category></category>
</emotion>

3.2 储存在一个Emotion.java里。Emotion.java代码如下：

package com.uim.microblog.model;
import java.io.Serializable;
public class Emotions implements Serializable {
/**
* 
*/
private static final long serialVersionUID = 1L;
private String phrase;//表情使用的替代文字
private String type;
private String url;//表情图片存放的位置
private String isHot;//是否为热门表情
private String isCommon;//是否属于通用
private String orderNumber;//该表情在系统中的排序号码
private String category;//表情分类
private String imageName;//表情名称
public String getImageName() {
return imageName;
}
public void setImageName(String imageName) {
this.imageName = imageName;
}
public String getPhrase() {
return phrase;
}
public void setPhrase(String phrase) {
this.phrase = phrase;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getIsHot() {
return isHot;
}
public void setIsHot(String isHot) {
this.isHot = isHot;
}
public String getIsCommon() {
return isCommon;
}
public void setIsCommon(String isCommon) {
this.isCommon = isCommon;
}
public String getOrderNumber() {
return orderNumber;
}
public void setOrderNumber(String orderNumber) {
this.orderNumber = orderNumber;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
}

3.2 储存在一个Emotion.java里。Emotion.java代码如下：

package com.uim.microblog.net.handler;
import java.util.ArrayList;
import java.util.List;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import com.uim.microblog.model.Emotions;
import com.uim.microblog.model.ResponseResult;
public class BlogEmotionsHandler extends DefaultHandler {
private List<Emotions> list;
private Emotions emotions;
private ResponseResult responseresult;
private String tag = null;//正在解析的元素
public List<Emotions> getEmotionsList(){
return list;
}
@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
if (tag != null) {
String textArea = new String(ch,start,length);
/**开始解析表情数据*/
if ("phrase".equals(tag)) {
emotions.setPhrase(textArea);
} else if ("type".equals(tag)) {
emotions.setType(textArea);
} else if ("url".equals(tag)) {
try {
emotions.setUrl(textArea);
String imageName = textArea.substring(textArea.lastIndexOf("/") + 1,textArea.length() - 4);
emotions.setImageName(imageName);
} catch (Exception e) {
e.printStackTrace();
}
} else if ("is_hot".equals(tag)) {
emotions.setIsHot(textArea);
} else if ("is_common".equals(tag)) {
emotions.setIsCommon(textArea);
} else if ("order_number".equals(tag)) {
emotions.setOrderNumber(textArea);
} else if ("category".equals(tag)) {
emotions.setCategory(textArea);
} else if ("retn".equals(tag)) {
responseresult.setRetn(textArea);
} else if ("desc".equals(tag)) {
responseresult.setDesc(textArea);
}
}
}
@Override
public void endDocument() throws SAXException {
super.endDocument();
}
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
tag = null;
if ("mb".equals(localName)) {
} else if ("emotions".equals(localName)) {
responseresult =null;
} else if ("emotion".equals(localName)) {
list.add(emotions);
emotions = null;
} 
}
@Override
public void startDocument() throws SAXException {
list = new ArrayList<Emotions>();
}
@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
if ("mb".equals(localName)) {
responseresult = new ResponseResult();
} else if ("emotions".equals(localName)) {
} else if ("emotion".equals(localName)) {
emotions = new Emotions();
} 
tag = localName;
}
}

3.4sax解析

public List<Emotions> getEmotion(){
BlogGetData getdata = new BlogGetData();
String result = getdata.blogEmotionsServlet();
try {
//生成SAX解析对象
parser = SAXParserFactory.newInstance().newSAXParser();
//生成xml读取器
reader = parser.getXMLReader();
BlogEmotionsHandler handler = new BlogEmotionsHandler();
//设置Handler
reader.setContentHandler(handler);
//指定文件，进行解析
reader.parse(new InputSource(new StringReader(result)));
//获取 List<Emotions>
emotionList = handler.getEmotionsList();
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return emotionList;
}

4：

4.1实现表情选择器---GridView

<GridView
android:id="@+id/blog_sendmsg_gvemotion"
android:layout_width="fill_parent"
android:layout_height="150sp"
android:scrollbars="vertical"
android:numColumns="auto_fit"
android:verticalSpacing="15dp"
android:background="@color/blog_list_back"
android:stretchMode="columnWidth"
android:gravity="center"
android:visibility="gone"
android:columnWidth="40dp">
</GridView>

4.2 GridView的item-----gridview_emotion_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView
android:id="@+id/blog_sendmsg_emotion"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="50"
android:layout_gravity="center">
</ImageView>
</LinearLayout>

4.3代码加载表情图片到GridView进行显示

public void addexpression(View view){
if (expressionGriView.getVisibility() == View.GONE) {
expressionGriView.setVisibility(View.VISIBLE);
emotionList = BlogHomeActivity.emotions;
ArrayList<HashMap<String, Object>> lstImageItem = new ArrayList<HashMap<String, Object>>();
for(int i=0;i<70;i++)  
{ 
emtions = emotionList.get(i);   
if (emtions != null) {
HashMap<String, Object> map = new HashMap<String, Object>();
Field f;
try {
f = (Field)R.drawable.class.getDeclaredField(emtions.getImageName());
int j = f.getInt(R.drawable.class);	
map.put("ItemImage", j);//添加图像资源的ID  
lstImageItem.add(map);  
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchFieldException e) {
e.printStackTrace();
}catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}  
}  
//生成适配器的ImageItem <====> 动态数组的元素，两者一一对应  
SimpleAdapter saImageItems = new SimpleAdapter(this, 
lstImageItem,//数据来源   
R.layout.blog_emotion_list,
//动态数组与ImageItem对应的子项          
new String[] {"ItemImage"},   
//ImageItem的XML文件里面的一个ImageView
new int[] {R.id.blog_sendmsg_emotion});  
expressionGriView.setAdapter(saImageItems);  
} else {
expressionGriView.setVisibility(View.GONE);
}
}

5：实现点击GridView的每一个item，处理根据item的index查找对应的表情code，然后再把code利用正则把code转换为相对应的表情图片，最后表情插入EditText进行发送

5.1:code转换为图片:

public SpannableString txtToImg(String content){
SpannableString ss = new SpannableString(content);
int starts = 0;
int end = 0;
if(content.indexOf("[", starts) != -1 && content.indexOf("]", end) != -1){
starts = content.indexOf("[", starts);
end = content.indexOf("]", end);
String phrase = content.substring(starts,end + 1);
String imageName = "";
List<Emotions> list = BlogHomeActivity.emotions;
for (Emotions emotions : list) {
if (emotions.getPhrase().equals(phrase)) {
imageName = emotions.getImageName();
}
}
try {
Field f = (Field)R.drawable.class.getDeclaredField(imageName);
int i= f.getInt(R.drawable.class);
Drawable drawable = BlogSendMsgActivity.this.getResources().getDrawable(i);  
if (drawable != null) {
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight()); 
ImageSpan span = new ImageSpan(drawable, ImageSpan.ALIGN_BASELINE);  
ss.setSpan(span, starts,end + 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);  
}
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchFieldException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
}
}
return ss;
}

5.2：插入EditText

emtions = emotionList.get(position);//获取表情bean
int cursor = etcontent.getSelectionStart();
etcontent.getText().insert(cursor, txtToImg(emtions.getPhrase()));