android 新浪微博客户端的表情功能的实现

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()));

写完收工，给个效果图：

转自：http://jspjson.iteye.com/blog/1109222