针对一个用户的Android限制注册

时间：2013-10-03 07:12:50

标签： java android sqlite limit

我开发了一个Android应用程序...这是一个应用程序第一页...它有两个按钮...注册并登录..当用户第一次进入时他需要注册并在注册时按下注册进程将开始...用户必须提供用户名，密码和手机号码...一旦他给了所有这些密码将被生成和将被发送到手机号码提供用户必须输入此密码与用户名一起收到和密码注册......一旦他注册..他可以用用户名和密码登录。 Al这些部分工作正常...我的要求是限制只有1个用户名的注册....所以对于一次下载，允许一个用户名..在一个注册后，注册选项必须停用...所以我必须为此而做..我正在给代码..不... ...

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();
}
}

注册活动

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});               
    }        

}

2 个答案:

答案 0 :(得分：2)

简化

只需获取 LOGIN 表的计数。如果它返回1，则隐藏SignUp按钮，否则显示SignUP按钮。使用以下代码行来获取表的总计数。

活动 

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

在数据库中 

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

它应该有用。

答案 1 :(得分：1)

一种快速简单的方法是使用带有表明是否创建帐户的值的“标记”。您可以使用布尔值或int。

所以你的编程逻辑就是这样：

主要活动

import android.content.SharedPreferences;
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) {
            if(getValue("registrationComplete"==1){
               Toast.makeText(getApplicationContext(), "You already have registered.",
                Toast.LENGTH_LONG).show(); }
           else{
                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();
}
public int getValue(String name) {
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
    return prefs.getInt(name, 0);
    }

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

SingUp活动

import android.content.SharedPreferences;
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);
            // Set value of registrationComplete to 1 to indicate its done.
            setValue("registrationComplete",1);
            Toast.makeText(getApplicationContext(), "Account Successfully Created and the passcode is sent to the mobile number you provided. ", Toast.LENGTH_LONG).show();






        }
    }
});
}

public void setValue(String name, int newValue) {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = prefs.edit();
editor.putInt(name, newValue);
editor.commit();
}

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();
}
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