[android help] Need help on getting data from WAMS android

I'm trying to get my username & password from my WAMS (android) to check during login (my login part is at btn1). I not sure if I did it correctly. Please help me take a look at it and see what did I do wrongly. Thanks.

package mp.memberuse;

import java.net.MalformedURLException;
import java.util.List;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;
import android.widget.TextView;

import com.microsoft.windowsazure.mobileservices.MobileServiceClient;
import com.microsoft.windowsazure.mobileservices.MobileServiceTable;
import com.microsoft.windowsazure.mobileservices.ServiceFilterResponse;
import com.microsoft.windowsazure.mobileservices.TableOperationCallback;
import com.microsoft.windowsazure.mobileservices.TableQueryCallback;

public class LoginRegister extends Activity {

Button btn1, btn2, btn3;
EditText tf1, tf2, tf3, tf4, tf5, tf6, tf7, tf8, tf9, tf10, tf11;
TextView tv1, tv2;

private MobileServiceClient mClient;
private MobileServiceTable mMembersTable;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    TabHost tabs = (TabHost) this.findViewById(R.id.lt2tabhost);
    tabs.setup();

    TabSpec ts1 = tabs.newTabSpec("Login");
    ts1.setIndicator("Login");
    ts1.setContent(R.id.c1);
    tabs.addTab(ts1);

    TabSpec ts2 = tabs.newTabSpec("Register");
    ts2.setIndicator("Register");
    ts2.setContent(R.id.c2);
    tabs.addTab(ts2);

    btn1 = (Button)findViewById(R.id.button1);
    btn2 = (Button)findViewById(R.id.button2);
    btn3 = (Button)findViewById(R.id.button3);

    tf1=(EditText) findViewById(R.id.editText1);
    tf2=(EditText) findViewById(R.id.editText2);
    tf3=(EditText) findViewById(R.id.editText3);
    tf4=(EditText) findViewById(R.id.editText4);
    tf5=(EditText) findViewById(R.id.editText5);
    tf6=(EditText) findViewById(R.id.editText6);
    tf7=(EditText) findViewById(R.id.editText7);
    tf8=(EditText) findViewById(R.id.editText8);
    tf9=(EditText) findViewById(R.id.editText9);
    tf10=(EditText) findViewById(R.id.editText10);

    tv1=(TextView) findViewById(R.id.login);
    tv2=(TextView) findViewById(R.id.register);

    try {
        // Create the Mobile Service Client instance, using the provided
        // Mobile Service URL and key
        mClient = new MobileServiceClient(
                  "https://*****.azure-mobile.net/",
                  "********************************",
                  this
            );

        // Get the Mobile Service Table instance to use
        mMembersTable = mClient.getTable(Members.class);


        } catch (MalformedURLException e) {
            //createAndShowDialog(new Exception("There was an error creating the Mobile Service. Verify the URL"), "Error");
        }

    btn1.setOnClickListener(new View.OnClickListener(){
        public void onClick(View v)
        {
            final String username, password;
            username = tf1.getText().toString();
            password = tf2.getText().toString();

            mMembersTable.select("username", "password").execute(new TableQueryCallback() 
            {
                public void onCompleted(List result, int count, Exception exception, ServiceFilterResponse response) {
                    if (exception == null) 
                    {
                         for (Members mbs : result) 
                         {
                             mbs.getUsername();
                             mbs.getPassword();

                             if(username.equals(mbs.getUsername()) && password.equals(mbs.getPassword()))
                             {
                                 Intent intent = new Intent (LoginRegister.this, Map.class);
                                 startActivity(intent);
                             }
                         }
                    }
                    else
                    {
                        tv1.setText("Invalid user");
                    }
                }
            });
        }
    });

    btn2.setOnClickListener(new View.OnClickListener(){
        public void onClick(View v)
        {
            String username, password, cpassword, fullname, nric, address, phone, email;
            username = tf3.getText().toString();
            password = tf4.getText().toString();
            cpassword = tf5.getText().toString();
            fullname = tf6.getText().toString();
            nric = tf7.getText().toString();
            address = tf8.getText().toString();
            phone = tf9.getText().toString();
            email = tf10.getText().toString();

            if (mClient == null) {
                return;
            }

            Members mbs = new Members();

            mbs.setUsername(username);
            mbs.setPassword(password);
            mbs.setFullname(fullname);
            mbs.setNric(nric);
            mbs.setAddress(address);
            mbs.setPhone(phone);
            mbs.setEmail(email);

            if(!password.equals(cpassword))
            {
                tv2.setText("Password & Confirm Password does not match.");
            }
            else if(username.equals("") || password.equals("") || cpassword.equals("") || fullname.equals("") || nric.equals("") || address.equals("") || phone.equals("") || email.equals(""))
            {
                tv2.setText("Do not leave any field empty.");
            }
            else
            {
                mMembersTable.insert(mbs, new TableOperationCallback() 
                {

                            public void onCompleted(Members entity, Exception exception, ServiceFilterResponse response) 
                            {

                                if (exception == null) 
                                {
                                    tv2.setText("Register Complete.");
                                    tf3.setText("");
                                    tf4.setText("");
                                    tf5.setText("");
                                    tf6.setText("");
                                    tf7.setText("");
                                    tf8.setText("");
                                    tf9.setText("");
                                    tf10.setText(""); 
                                } 
                                else 
                                {
                                    tv2.setText("Fail to register!");
                                    tf3.setText("");
                                    tf4.setText("");
                                    tf5.setText("");
                                    tf6.setText("");
                                    tf7.setText("");
                                    tf8.setText("");
                                    tf9.setText("");
                                    tf10.setText("");
                                }

                            }
                });         
            }
        }
    });

    btn3.setOnClickListener(new View.OnClickListener(){
        public void onClick(View v)
        {
            tf3.setText("");
            tf4.setText("");
            tf5.setText("");
            tf6.setText("");
            tf7.setText("");
            tf8.setText("");
            tf9.setText("");
            tf10.setText("");           
        }
    });
}
}

.

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