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