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;}@Overridepublic 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);}}}@Overridepublic void endDocument() throws SAXException {super.endDocument();}@Overridepublic 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;} }@Overridepublic void startDocument() throws SAXException {list = new ArrayList<Emotions>();}@Overridepublic 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Handlerreader.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

 

<GridViewandroid: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