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