I Want the return dataset from JSON webservice to android ListView Using KSoap2

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Am Priya.Created Json project which consume webservice from dotnet..from json webservice i want to display list of dataset in android listview..when i debuging the error shows in this line data.resultData, data.resultExtras, data.resultAbort); from ActivityThread.java.. this is my code..help me

public class MainActivity extends Fragment {
SessionManager session;
private static final String Soap_Action_JSONEXP="";
private static final String METHOD_NAME_JSONEXP="";
private static final String NAMESPACEEXP="";
private static final String URL_jsEXP="";
private String TAG="";
ListView lv;
private static String responseJSON;
ProgressBar pg;
Gson gson=new Gson();
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState){
session=new SessionManager(getActivity());
session.checkLogin();
View view=inflater.inflate(R.layout.activity_main,container,false);
return view;
}
@Override
public void onActivityCreated(Bundle savedInstanceState){
super.onActivityCreated(savedInstanceState);
lv=(ListView)getActivity().findViewById(R.id.listView1);
Thread cmdthredlista=new Thread(){

@Override
public void run(){
SoapObject cmdrequest=new SoapObject(NAMESPACEEXP,METHOD_NAME_JSONEXP);
System.out.println("requsest "+cmdrequest);
SoapSerializationEnvelope envelope=new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.dotNet=true;
envelope.setOutputSoapObject(cmdrequest);
HttpTransportSE ahttptransport=new HttpTransportSE(URL_jsEXP);
try {
ahttptransport.call(Soap_Action_JSONEXP,envelope);
//final SoapPrimitive response=(SoapPrimitive)envelope.getResponse();
SoapPrimitive response=(SoapPrimitive)envelope.getResponse();
responseJSON=response.toString();
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
try {
String[] placelist;
placelist=gson.fromJson(responseJSON,String[].class);
ArrayAdapter<string>cmdlistaadapteri;
cmdlistaadapteri=new ArrayAdapter<string>(getActivity(),android.R.layout.activity_list_item,placelist);
lv.setAdapter(cmdlistaadapteri);
}
catch (Exception e){
e.printStackTrace();
System.out.println("error ");
}
}
});
}
catch (Exception e){
e.printStackTrace();
System.out.println("error ");
}
}
};
cmdthredlista.start();

public String getTAG() {
return TAG;
}
public void setTAG(String tAG) {
TAG = tAG;
}



}

this is my logcat

03-31 18:34:36.849: E/AndroidRuntime(2300): FATAL EXCEPTION: main
03-31 18:34:36.849: E/AndroidRuntime(2300): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.tracking/com.example.tracking.MainActivity}: java.lang.ClassCastException: com.example.tracking.MainActivity
03-31 18:34:36.849: E/AndroidRuntime(2300): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585)
03-31 18:34:36.849: E/AndroidRuntime(2300): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
03-31 18:34:36.849: E/AndroidRuntime(2300): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
03-31 18:34:36.849: E/AndroidRuntime(2300): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
03-31 18:34:36.849: E/AndroidRuntime(2300): at android.os.Handler.dispatchMessage(Handler.java:99)
03-31 18:34:36.849: E/AndroidRuntime(2300): at android.os.Looper.loop(Looper.java:123)
03-31 18:34:36.849: E/AndroidRuntime(2300): at android.app.ActivityThread.main(ActivityThread.java:4627)
03-31 18:34:36.849: E/AndroidRuntime(2300): at java.lang.reflect.Method.invokeNative(Native Method)
03-31 18:34:36.849: E/AndroidRuntime(2300): at java.lang.reflect.Method.invoke(Method.java:521)
03-31 18:34:36.849: E/AndroidRuntime(2300): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-31 18:34:36.849: E/AndroidRuntime(2300): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-31 18:34:36.849: E/AndroidRuntime(2300): at dalvik.system.NativeStart.main(Native Method)
03-31 18:34:36.849: E/AndroidRuntime(2300): Caused by: java.lang.ClassCastException: com.example.tracking.MainActivity
03-31 18:34:36.849: E/AndroidRuntime(2300): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
03-31 18:34:36.849: E/AndroidRuntime(2300): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
03-31 18:34:36.849: E/AndroidRuntime(2300): ... 11 more