我试图将Android应用程序连接到WCF服务,但它无法正常工作。 WCF托管在IIS服务器上。我不知道哪个是错误的android应用程序或WCF服务本身。测试时,WCF服务正常运行。这是我的WCF服务代码。
[ServiceContract(Namespace = "http://services.example.com")]
public interface IEmployeeInfo
{
[OperationContract]
[WebInvoke(
BodyStyle = WebMessageBodyStyle.Wrapped,
Method="Get",
ResponseFormat = WebMessageFormat.Json,
UriTemplate = "GetEmployee/?key={employeeId}" )]
Employee GetEmployee(int employeeId);
}
这是我正在访问WCF服务的安卓代码
try {
DefaultHttpClient client = new DefaultHttpClient();
// http get request
HttpGet request = new HttpGet(EMPLOYEE_SERVICE_URI + evEmployeeId.getText());
Log.d("Connect","Connecting to Server 0");
Log.d("Connect","Connecting to Server 1");
// set the hedear to get the data in JSON formate
request.setHeader("Accept", "application/json");
request.setHeader("Content-type", "application/json");
//get the response
HttpResponse response = client.execute(request);
HttpEntity entity = response.getEntity();
//if entity contect lenght 0, means no employee exist in the system with these code
if(entity.getContentLength() != 0) {
// stream reader object
Reader employeeReader = new InputStreamReader(response.getEntity().getContent());
//create a buffer to fill if from reader
char[] buffer = new char[(int) response.getEntity().getContentLength()];
//fill the buffer by the help of reader
employeeReader.read(buffer);
//close the reader streams
employeeReader.close();
Log.d("Connect","Connecting to Server 2");
//for the employee json object
JSONObject employee = new JSONObject(new String(buffer));
//set the text of text view
tvEmployeeCode.setText("Code: " + employee.getString("EmployeeId"));
tvName.setText("Name: " + employee.getString("FirstName") + " " + employee.getString("LastName"));
tvAddress.setText("Address: " + employee.getString("Address"));
tvBloodGroup.setText("Blood Group: " + employee.getString("BloodGroup"));
}
else {
text.setTextSize(R.string.text);
}
}
catch (Exception e) {
Log.d("Error",e.getMessage());
e.printStackTrace();
}
感谢任何帮助。
当我从android模拟器applcation请求WCF服务时崩溃。这里是logchat。
11-17 22:56:55.566: W/dalvikvm(1174): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
11-17 22:56:55.616: E/AndroidRuntime(1174): FATAL EXCEPTION: main
11-17 22:56:55.616: E/AndroidRuntime(1174): java.lang.NullPointerException: println needs a message
11-17 22:56:55.616: E/AndroidRuntime(1174): at android.util.Log.println_native(Native Method)
11-17 22:56:55.616: E/AndroidRuntime(1174): at android.util.Log.d(Log.java:138)
11-17 22:56:55.616: E/AndroidRuntime(1174): at com.yyousuf.sample.EmployeeInfoActivity.onClick
答案 0 :(得分:0)
抛出异常,但由于您正在捕获所有异常,因此您没有详细信息。由于某种原因,抛出的Exception没有消息集,这就是你在这一行得到NullPointerException的原因
Log.d("Error",e.getMessage());
请发布有关真实抛出异常的更多信息。