Custom development

Hi

I am new to develop an android application, I am trying to use Wialon Java API to design an application.

on my application i need following steps

Step 1.  Login - Using username and password
Step 2.  Loading available vehicles in Listview in my app

when i am runnig my application i ma getting following error

06-01 12:36:54.326 19935-19935/net.atsuae.myapplicationwialon W/System: ClassLoader referenced unknown path: /system/framework/QPerformance.jar
06-01 12:36:54.330 19935-19935/net.atsuae.myapplicationwialon E/BoostFramework: BoostFramework() : Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib64, /vendor/lib64]]
06-01 12:36:54.526 19935-19935/net.atsuae.myapplicationwialon E/AndroidRuntime: FATAL EXCEPTION: main
    Process: net.atsuae.myapplicationwialon, PID: 19935
    java.lang.NullPointerException: Attempt to invoke virtual method 'boolean com.wialon.

here i am attaching my source code

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import com.wialon.core.Errors;
import com.wialon.core.Session;
import com.wialon.extra.SearchSpec;
import com.wialon.item.Item;
import com.wialon.remote.handlers.ResponseHandler;
import com.wialon.remote.handlers.SearchResponseHandler;

public class MainActivity extends AppCompatActivity {

    private Session session;
    EditText userName, pssword;
    Button userlogin;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        userName = (EditText) findViewById(R.id.username);
        pssword = (EditText) findViewById(R.id.password);
        userlogin = (Button) findViewById(R.id.loginbtn);
       
        userlogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               
                String userid = userName.getText().toString();
                String pass = pssword.getText().toString();
               
              session.initSession("http://host.wialon.com");
              session.login(userid, pass, new ResponseHandler() {
                 
                  @Override
                  public void onSuccess(String response) {
                      super.onSuccess(response);
                      System.out.println(String.format("Logged successfully. User name is %s", session.getCurrUser().getName()));
                  }

                  @Override
                  public void onFailure(int errorCode, Throwable throwableError) {
                      super.onFailure(errorCode, throwableError);
                      // login failed, print error
                      System.out.println(Errors.getErrorText(errorCode));
                  }
              });
            }
        });
    }
}