Android Limiting signup for one user

Question

I developed an android application ... It is an applications first page... two buttons it have ... signup and sign in .. when user enter for first time he needs to signup and when sign up is pressed registration process will start ... user has to give an username, password and a mobile number .. once he give all this a passcode will be generated annd will be send to the mobile number provided user has to enter this passcode recieved along with the username and password to register... once he got register .. he can signin with the username and password. Al these part is working fine ... My requirement is to limit the registration for only 1 username.... so for one download one username is allowed .. after one registartion the signup option must deactivated... so what I have to do for that .. I am giving the code ..below...

MainActivity

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.app.Activity;
import android.app.Dialog;
import android.content.Intent;

public class MainActivity extends Activity {


     Button btnSignIn,btnSignUp;
    LoginDataBaseAdapter loginDataBaseAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);



        loginDataBaseAdapter=new LoginDataBaseAdapter(this);
        loginDataBaseAdapter=loginDataBaseAdapter.open();


        btnSignIn=(Button)findViewById(R.id.buttonSignIn);
        btnSignUp=(Button)findViewById(R.id.buttonSignUP);



        btnSignUp.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                Intent intentSignUP=new Intent(getApplicationContext(),SignUPActivity.class);
                startActivity(intentSignUP);

            }
        });
    }

    public void signIn(View V)
    {
         final Dialog dialog = new Dialog(MainActivity.this);
         dialog.setContentView(R.layout.login);
         dialog.setTitle("Login");

         // get the References of views
         final  EditText editTextUserName=(EditText)dialog.findViewById(R.id.editTextUserNameToLogin);
         final  EditText editTextPassword=(EditText)dialog.findViewById(R.id.editTextPasswordToLogin);
         final  EditText editTextMobileNumber = (EditText)dialog.findViewById(R.id.editText1);


         Button btnSignIn=(Button)dialog.findViewById(R.id.buttonSignIn);


         btnSignIn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                String userName=editTextUserName.getText().toString();
                String password=editTextPassword.getText().toString();
                String mobileNumber = editTextMobileNumber.getText().toString();

                // fetch the Password form database for respective user name
                String storedPassword=loginDataBaseAdapter.getSinlgeEntry(userName);



                String sd = getIntent().getStringExtra("number"); 




                // check if the Stored password matches with  Password entered by user
                if(password.equals(storedPassword) && (mobileNumber.equals(sd))) 
                {
                    Toast.makeText(MainActivity.this, "Congrats: Login Successfull", Toast.LENGTH_LONG).show();
                    dialog.dismiss();
                }
                else
                {
                    Toast.makeText(MainActivity.this, "User Name or Password does not match", Toast.LENGTH_LONG).show();
                }

            }
        });


         dialog.show();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        // Close The Database
        loginDataBaseAdapter.close();
}
}

Signup Activity

import java.util.Random;
import java.util.StringTokenizer;

import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class SignUPActivity extends Activity

{
    EditText editTextUserName,editTextPassword,editTextConfirmPassword, editMobileNumber;
    Button btnCreateAccount;


    Random r = new Random();
    int number =r.nextInt(9999 - 1000) + 1000;



    LoginDataBaseAdapter loginDataBaseAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.signup);

        // get Instance  of Database Adapter
        loginDataBaseAdapter=new LoginDataBaseAdapter(this);
        loginDataBaseAdapter=loginDataBaseAdapter.open();

        // Get References of Views


        editTextUserName=(EditText)findViewById(R.id.editTextUserName);
        editTextPassword=(EditText)findViewById(R.id.editTextPassword);
        editTextConfirmPassword=(EditText)findViewById(R.id.editTextConfirmPassword);
        editMobileNumber = (EditText)findViewById(R.id.mobileNumber);




        btnCreateAccount=(Button)findViewById(R.id.buttonCreateAccount);
        btnCreateAccount.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub



            String userName=editTextUserName.getText().toString();
            String password=editTextPassword.getText().toString();
            String confirmPassword=editTextConfirmPassword.getText().toString();

            String phoneNo = editMobileNumber.getText().toString();
            String sms = Integer.toString(number);


            Intent intent = new Intent(SignUPActivity.this, MainActivity.class);

            intent.putExtra("number", sms + "");
            startActivity(intent);



            StringTokenizer st=new StringTokenizer(phoneNo,",");
            while (st.hasMoreElements())

            {

                String tempMobileNumber = (String)st.nextElement();
                if(tempMobileNumber.length()>0 && sms.trim().length()>0) {
                    sendSMS(tempMobileNumber, sms);

                }


                else 

                {

                    Toast.makeText(getBaseContext(), 
                            "Please enter both phone number and message.", 
                            Toast.LENGTH_SHORT).show();
                }

            }








            // check if any of the fields are vacant
            if(userName.equals("")||password.equals("")||confirmPassword.equals(""))
            {
                    Toast.makeText(getApplicationContext(), "Field Vaccant", Toast.LENGTH_LONG).show();
                    return;
            }
            // check if both password matches
            if(!password.equals(confirmPassword))
            {
                Toast.makeText(getApplicationContext(), "Password does not match", Toast.LENGTH_LONG).show();
                return;
            }
            else
            {
                // Save the Data in Database
                loginDataBaseAdapter.insertEntry(userName, password);
                Toast.makeText(getApplicationContext(), "Account Successfully Created and the passcode is sent to the mobile number you provided. ", Toast.LENGTH_LONG).show();






            }
        }
    });
}










    private void sendSMS(String phoneNumber, String message)
    {
        String SENT = "SMS_SENT";
        String DELIVERED = "SMS_DELIVERED";

        PendingIntent sentPI = PendingIntent.getBroadcast(this, 0,
            new Intent(SENT), 0);

        PendingIntent deliveredPI = PendingIntent.getBroadcast(this, 0,
            new Intent(DELIVERED), 0);

      //---when the SMS has been sent---
        registerReceiver(new BroadcastReceiver(){
            @Override
            public void onReceive(Context arg0, Intent arg1) {
                switch (getResultCode())
                {
                    case Activity.RESULT_OK:
                        Toast.makeText(getBaseContext(), "SMS sent", 
                                Toast.LENGTH_SHORT).show();
                        break;
                    case SmsManager.RESULT_ERROR_GENERIC_FAILURE:
                        Toast.makeText(getBaseContext(), "Generic failure", 
                                Toast.LENGTH_SHORT).show();
                        break;
                    case SmsManager.RESULT_ERROR_NO_SERVICE:
                        Toast.makeText(getBaseContext(), "No service", 
                                Toast.LENGTH_SHORT).show();
                        break;
                    case SmsManager.RESULT_ERROR_NULL_PDU:
                        Toast.makeText(getBaseContext(), "Null PDU", 
                                Toast.LENGTH_SHORT).show();
                        break;
                    case SmsManager.RESULT_ERROR_RADIO_OFF:
                        Toast.makeText(getBaseContext(), "Radio off", 
                                Toast.LENGTH_SHORT).show();
                        break;
                }
            }
        },new IntentFilter(SENT));

        //---when the SMS has been delivered---
        registerReceiver(new BroadcastReceiver(){
            @Override
            public void onReceive(Context arg0, Intent arg1) {
                switch (getResultCode())
                {
                    case Activity.RESULT_OK:
                        Toast.makeText(getBaseContext(), "SMS delivered", 
                                Toast.LENGTH_SHORT).show();
                        break;
                    case Activity.RESULT_CANCELED:
                        Toast.makeText(getBaseContext(), "SMS not delivered", 
                                Toast.LENGTH_SHORT).show();
                        break;                        
                }
            }
        }, new IntentFilter(DELIVERED));        

        SmsManager sms = SmsManager.getDefault();
        sms.sendTextMessage(phoneNumber, null, message, sentPI, deliveredPI);       


    }









    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();

        loginDataBaseAdapter.close();
    }



}

LoginDataBaseAdapter.java

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;

public class LoginDataBaseAdapter {

    static final String DATABASE_NAME = "login.db";
    static final int DATABASE_VERSION = 1;
    public static final int NAME_COLUMN = 1;
    // TODO: Create public field for each column in your table.
    // SQL Statement to create a new database.
    static final String DATABASE_CREATE = "create table "+"LOGIN"+
                                 "( " +"ID"+" integer primary key autoincrement,"+ "USERNAME  text,PASSWORD text); ";
    // Variable to hold the database instance
    public  SQLiteDatabase db;
    // Context of the application using the database.
    private final Context context;
    // Database open/upgrade helper
    private DataBaseHelper dbHelper;
    public  LoginDataBaseAdapter(Context _context) 
    {
        context = _context;
        dbHelper = new DataBaseHelper(context, DATABASE_NAME, null, DATABASE_VERSION);
    }
    public  LoginDataBaseAdapter open() throws SQLException 
    {
        db = dbHelper.getWritableDatabase();
        return this;
    }
    public void close() 
    {
        db.close();
    }

    public  SQLiteDatabase getDatabaseInstance()
    {
        return db;
    }

    public void insertEntry(String userName,String password)
    {
       ContentValues newValues = new ContentValues();
        // Assign values for each row.
        newValues.put("USERNAME", userName);
        newValues.put("PASSWORD",password);

        // Insert the row into your table
        db.insert("LOGIN", null, newValues);
        ///Toast.makeText(context, "Reminder Is Successfully Saved", Toast.LENGTH_LONG).show();
    }
    public int deleteEntry(String UserName)
    {
        //String id=String.valueOf(ID);
        String where="USERNAME=?";
        int numberOFEntriesDeleted= db.delete("LOGIN", where, new String[]{UserName}) ;
       // Toast.makeText(context, "Number for Entry Deleted Successfully : "+numberOFEntriesDeleted, Toast.LENGTH_LONG).show();
        return numberOFEntriesDeleted;
    }    
    public String getSinlgeEntry(String userName)
    {
        Cursor cursor=db.query("LOGIN", null, " USERNAME=?", new String[]{userName}, null, null, null);
        if(cursor.getCount()<1) // UserName Not Exist
        {
            cursor.close();
            return "NOT EXIST";
        }
        cursor.moveToFirst();
        String password= cursor.getString(cursor.getColumnIndex("PASSWORD"));
        cursor.close();
        return password;                
    }
    public void  updateEntry(String userName,String password)
    {
        // Define the updated row content.
        ContentValues updatedValues = new ContentValues();
        // Assign values for each row.
        updatedValues.put("USERNAME", userName);
        updatedValues.put("PASSWORD",password);

        String where="USERNAME = ?";
        db.update("LOGIN",updatedValues, where, new String[]{userName});               
    }        

}

vinothp · Accepted Answer

To make it simple

Just get the count of the LOGIN Table. If it returns 1 then hide the SignUp button otherwise show the SignUP button. Use the following line of code to get the total count of the table.

In Activity

 if(loginDataBaseAdapter.getUsercount()==1){
          btnSignUp.setVisibility(View.INVISIBLE);
 }

In Database

   public long getUsercount() { 
        return DatabaseUtils.queryNumEntries(db, "LOGIN");
    }

It should work.

Android Limiting signup for one user

Answers (2)

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