我的Url.OpenConnection找不到Android 4.3中的网址（我的客户端智能手机，她在西班牙），列表视图不会加载任何甚至没有崩溃，但通常在Android 2.2上加载xml内容（我在阿根廷） ，任何人都知道问题会是什么，请从http://dev.mejorconsalud.com/feed/网页获取xml，我没有任何猫日志，所以请提出任何建议
URL url = new URL(urlString);
URLConnection conn = url.openConnection();
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(conn.getInputStream());
答案 0 :(得分：0)
Try to use these two class. It will help you.
**UHttpClient .java**
public class UHttpClient {
private HttpClient httpClient = null;
public static final int OK = 200;
public static final int NO_CONTENT = 204;
private static final int CONNECTION_TIMEOUT = 5000;
/* timeout for waiting for data, since once connection is established then waiting for response*/
private static final int SOCKET_TIMEOUT = 20000;
public UHttpClient(UAppInstance appInstance, String loginURL, String deviceID)
throws UBaseException {
HttpParams httpParameters = new BasicHttpParams();
// Set the timeout in milliseconds until a connection is established.
HttpConnectionParams.setConnectionTimeout(httpParameters, CONNECTION_TIMEOUT);
// Set the default socket timeout (SO_TIMEOUT)
// in milliseconds which is the timeout for waiting for data.
HttpConnectionParams.setSoTimeout(httpParameters, SOCKET_TIMEOUT);
//httpClient = new DefaultHttpClient(httpParameters);
httpClient = new DefaultHttpClient();
login(loginURL, deviceID);
}
/**
* Makes the GET call
* @param urlStr - Url string
* @param paramNames - parameter names
* @param paramValues - parameter values
* @return - response body string
* @throws UBaseException
*/
public String executeGet(String urlStr, String[] paramNames, String[] paramValues)
throws UBaseException {
HttpGet httpget = null;
try {
int length = paramNames != null ? paramNames.length : 0;
urlStr = length > 0 ? (urlStr + "?") : urlStr;
for (int k = 0; k < length; k++) {
urlStr = k > 0 ? (urlStr + "&") : urlStr;
urlStr = urlStr + paramNames[k] + "=" + paramValues[k];
}
httpget = new HttpGet(urlStr);
// Execute HTTP Get Request
ResponseHandler<String> respHandler = new BasicResponseHandler();
String response = httpClient.execute(httpget, respHandler);
return response;
} catch (SocketTimeoutException e) {
throw new UBaseException("Connection Timeout", e);
} catch (Exception e) {
if(null == e.getMessage() || "".equals(e.getMessage()))
throw new UBaseException("Unable to connect to server", e);
else
throw new UBaseException(e.getMessage(), e);
}
}
/**
* Makes the POST call
* @param urlStr - Url string
* @param paramNames - parameter names
* @param paramValues - parameter values
* @return - response body string
* @throws UBaseException
*/
public String executePost(String urlStr, String[] paramNames, String[] paramValues)
throws UBaseException {
HttpPost httppost = new HttpPost(urlStr);
try {
int length = paramNames != null ? paramNames.length : 0;
ArrayList<NameValuePair> paramsList = new ArrayList<NameValuePair>();
for (int k = 0; k < length; k++) {
paramsList.add(new BasicNameValuePair(paramNames[k], paramValues[k]));
}
List<NameValuePair> nameValuePairs = paramsList;
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
ResponseHandler<String> respHandler = new BasicResponseHandler();
String response = httpClient.execute(httppost, respHandler);
return response;
} catch (SocketTimeoutException e) {
throw new UBaseException("Connection Timeout", e);
} catch (Exception e) {
if(null == e.getMessage() || "".equals(e.getMessage()))
throw new UBaseException("Unable to connect to server", e);
else
throw new UBaseException(e.getMessage(), e);
}
}
protected void login(String url, String deviceID)
throws UBaseException {
String[] argNames = new String[] {"userDeviceID", "loginMode", "command"};
String[] argValues = new String[] {deviceID, "handheldLogin", "login"};
String response = executePost(url, argNames, argValues);
if(null != response){
response = response.trim();
}
// if response message is not success that means it's a failure so raising exception
if("success".equals(response) == false) {
if(!"".equals(response))
throw new UBaseException(response, null);
else
throw new UBaseException("Remote login failed to '" + url + "'", null);
}
}
}
**URemoteConnection.java**
public class URemoteConnection {
private UHttpClient client = null;
private String remoteHost = null;
private String appName = null;
private String servletName = null;
private String remoteURL = null;
private String deviceID = null;
private String httpPortNum = "";
private String httpsPortNum = "";
private static final String REMOTE_APP_NAME = "_REMOTE_APP_NAME_";
private static final String REMOTE_HOST_ADDRESS = "_REMOTE_HOST_ADDR_";
private static final String REMOTE_HTTP_PORT = "_REMOTE_HTTP_PORT_";
private static final String REMOTE_HTTPS_PORT = "_REMOTE_HTTPS_PORT_";
private static final String FEEDBACK_MSG_SEPERATOR = "-stat-";
private static final String FEEDBACK_MSG_SUCCESS_STR = "200";
/**
* URemoteConnection constructor
*
* @param appInstance
* - UAppInstance object
* @param app
* - remote application name
* @param servlet
* - servlet name
* @throws UBaseException
*/
public URemoteConnection(UAppInstance appInstance, String app,
String servlet) throws UBaseException {
try {
appName = app;
servletName = servlet;
remoteHost = getServerAddress(appInstance, appName);
httpPortNum = getServerHttpPort(appInstance, appName);
httpsPortNum = getServerHttpsPort(appInstance, appName);
deviceID = CommonUtils.getUserDeviceID(appInstance);
remoteURL = "http://" + remoteHost + ":" + httpPortNum + "/"
+ appName + "/" + servletName;
String loginURL = "http://" + remoteHost + ":" + httpPortNum + "/"
+ appName + "/Login";
Log.d("URemoteConnection", "remoteURL : " + remoteURL);
Log.d("URemoteConnection", "loginURL : " + loginURL);
client = new UHttpClient(appInstance, loginURL, deviceID);
} catch (Exception e) {
throw new UBaseException(e.getMessage(), e);
}
}
/**
* Call to do any data upload. Makes Http POST call.
*
* @param argsNames
* @param argsValues
* @return - response text
* @throws UBaseException
*/
public String processData(String[] argsNames, String[] argsValues)
throws UBaseException {
try {
String response = client.executePost(remoteURL, argsNames,
argsValues);
response = _filterFeedBackMsg(response);
return response;
} catch (Exception e) {
throw new UBaseException(e.getMessage(), e);
}
}
/**
* Call to do any data download. Makes Http GET call.
*
* @param argsNames
* @param argsValues
* @return - response body string
* @throws UBaseException
*/
public String requestData(String[] argsNames, String[] argsValues)
throws UBaseException {
try {
String response = client.executeGet(remoteURL, argsNames,
argsValues);
response = _filterFeedBackMsg(response);
return response;
} catch (Exception e) {
throw new UBaseException(e.getMessage(), e);
}
}
/**
* Loads the remote app details from database and populates the in-memory
* cache.
*
* @param appInstance
* @throws UDBAccessException
*/
public static void loadRemoteAppDetails(UAppInstance appInstance)
throws UDBAccessException {
Cursor cur = appInstance.getDBHandle().executeQuery(
"mobi_remote_app",
new String[] { "remote_app_name", "remote_host_address",
"remote_http_port", "remote_https_port" }, null, null,
null, null, null);
while (null != cur && cur.moveToNext()) {
String appName = cur.getString(cur
.getColumnIndex("remote_app_name"));
appInstance.setAttribute(REMOTE_APP_NAME, appName);
appInstance.setAttribute(REMOTE_HOST_ADDRESS + "~" + appName,
cur.getString(cur.getColumnIndex("remote_host_address")));
appInstance.setAttribute(REMOTE_HTTP_PORT + "~" + appName,
cur.getString(cur.getColumnIndex("remote_http_port")));
appInstance.setAttribute(REMOTE_HTTPS_PORT + "~" + appName,
cur.getString(cur.getColumnIndex("remote_https_port")));
}
if (null != cur) {
cur.close();
}
}
public static String getServerAddress(UAppInstance appInstance,
String appName) {
return "172.16.0.117";
}
public static String getServerHttpPort(UAppInstance appInstance,
String appName) {
return "8080";
}
public static String getServerHttpsPort(UAppInstance appInstance,
String appName) {
return appInstance.getAttribute(REMOTE_HTTPS_PORT + "~" + appName, "");
}
/*
* Checking if from the server side if any error coming then throw the
* exception else sent the original feedback
*/
private static String _filterFeedBackMsg(String feedBackMsg)
throws Exception {
if (feedBackMsg != null && !"".equals(feedBackMsg)
&& !feedBackMsg.equalsIgnoreCase("null")) {
if (feedBackMsg.indexOf(FEEDBACK_MSG_SEPERATOR) > -1) {
String feedBackMsgArr[] = feedBackMsg
.split(FEEDBACK_MSG_SEPERATOR);
if (feedBackMsgArr != null && feedBackMsgArr.length > 1) {
if (feedBackMsgArr[0] != null
&& !FEEDBACK_MSG_SUCCESS_STR
.equals(feedBackMsgArr[0])) {
throw new Exception(feedBackMsgArr[1]);
}
}
}
}
return feedBackMsg;
}
}