安卓手机最通俗_最实用的Android开发高级培训教程(11).ppt

1、北京传智播客教育 ,北京传智播客教育 ,通信录操作,使用ContentResolver对通信录中的数据进行添加、删除、修改和查询操作： 加入读写联系人信息的权限 添加与查询代码请见ppt下方,北京传智播客教育 ,北京传智播客教育 ,从网络中获取数据,利用HttpURLConnection对象,我们可以从网络中获取网页数据. URL url = new URL(); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(5* 1000);/设置连接超时 conn.setR

2、equestMethod(“GET”);/以get方式发起请求 if (conn.getResponseCode() != 200) throw new RuntimeException(请求url失败); InputStream is = conn.getInputStream();/得到网络返回的输入流 String result = readData(is, GBK); conn.disconnect(); /第一个参数为输入流,第二个参数为字符集编码 public static String readData(InputStream inSream, String charsetNam

3、e) throws Exception ByteArrayOutputStream outStream = new ByteArrayOutputStream(); byte buffer = new byte1024; int len = -1; while( (len = inSream.read(buffer) != -1 ) outStream.write(buffer, 0, len); byte data = outStream.toByteArray(); outStream.close(); inSream.close(); return new String(data, ch

4、arsetName); ,北京传智播客教育 ,北京传智播客教育 ,从网络中获取数据,利用HttpURLConnection对象,我们可以从网络中获取文件数据. URL url = new URL( HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(5* 1000); conn.setRequestMethod(GET); if (conn.getResponseCode() != 200) throw new RuntimeException(请求url失败); I

5、nputStream is = conn.getInputStream(); readAsFile(is, Img269812337.jpg); public static void readAsFile(InputStream inSream, File file) throws Exception FileOutputStream outStream = new FileOutputStream(file); byte buffer = new byte1024; int len = -1; while( (len = inSream.read(buffer) != -1 ) outStr

6、eam.write(buffer, 0, len); outStream.close(); inSream.close(); ,http:/www.anzhuo.cc/ 安卓手机论坛,北京传智播客教育 ,北京传智播客教育 ,向Internet发送请求参数,利用HttpURLConnection对象,我们可以向网络发送请求参数. String requestUrl = http:/localhost:8080/itcast/contanctmanage.do; Map requestParams = new HashMap(); requestParams.put(age, 12); requestParams.put(name, 中国); StringBuilder params = new StringBuilder(); for(Map.Entry entry : requestParams.entrySet() params.append(entry.g