Showing posts with label Create Databse. Show all posts
Showing posts with label Create Databse. Show all posts

Saturday, June 22, 2013

Using Database In Android

In this post we will develop an app in which a user can perform following task
1: User Can Create Account
2: User Can log in 

we will use and learn following this in this Post

Customized Dialog:  Here we have used  Customized Dialog   for User Login.
Creating DataBase:  Here we have created database for Storing   UserName and Password.
Writing functions for Inserting, Deleting, Updating and querying a Datbase.


we have create a Table with following Fields :

USERNAME :  to store the user name.
PASSWORD: to store the password of User

Table Name is LOGIN 


The Code is well commented  , just go through , you will understand easily.


Some More Good  Android Topics
Customizing Toast In Android 
 Showing Toast for Longer Time
Customizing Checkboxes In Android  
Customizing Progress Bar

 

  List of XMLs Used.



main.xml :   main screen
signup.xml : to create a new account
login.xml  :   to login


main.xml  



                          


    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center_vertical" >



    <Button
        android:id="@+id/buttonSignIN"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
         android:text="Sign IN"
         android:onClick="signIn"/>

    <Button
        android:id="@+id/buttonSignUP"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Sign UP" />

</LinearLayout>


signup.xml




<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center_vertical" >

    <EditText
        android:id="@+id/editTextUserName"
        android:hint="User Name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        >

        <requestFocus />
    </EditText>

    <EditText
        android:id="@+id/editTextPassword"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
         android:hint="Password"
        android:inputType="textPassword" />

    <EditText
        android:id="@+id/editTextConfirmPassword"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="Confirm Password"
        android:inputType="textPassword" />

    <Button
        android:id="@+id/buttonCreateAccount"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Create Account"
        android:layout_marginBottom="60dp" />
   
</LinearLayout>



login.xml




<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/editTextUserNameToLogin"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="User Name"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <EditText
        android:id="@+id/editTextPasswordToLogin"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textPassword"
        android:hint="Password" />

    <Button
        android:id="@+id/buttonSignIn"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Sign In" />

</LinearLayout>



Activities:


1:    HomeActivity.java


public class HomeActivity extends Activity
{
    
    Button btnSignIn,btnSignUp;
    LoginDataBaseAdapter loginDataBaseAdapter;
   
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
             super.onCreate(savedInstanceState);
             setContentView(R.layout.main);
            
             // create the instance of Databse
             loginDataBaseAdapter=new LoginDataBaseAdapter(this);
             loginDataBaseAdapter=loginDataBaseAdapter.open();
            
             // Get The Refference Of Buttons
             btnSignIn=(Button)findViewById(R.id.buttonSignIN);
             btnSignUp=(Button)findViewById(R.id.buttonSignUP);
            
          
           
            // Set OnClick Listener on SignUp button
             btnSignUp.setOnClickListener(new View.OnClickListener() {
                   
                    public void onClick(View v) {
                        // TODO Auto-generated method stub
                       
                        /// Create Intent for SignUpActivity  abd Start The Activity
                        Intent intentSignUP=new Intent(getApplicationContext(),SignUPActivity.class);
                        startActivity(intentSignUP);
                    }
                });
    }

   
    // Methos to handleClick Event of Sign In Button
    public void signIn(View V)
       {
               
              final Dialog dialog = new Dialog(HomeActivity.this);

                dialog.setContentView(R.layout.login);
                dialog.setTitle("Login");

                // get the Refferences of views
                final  EditText editTextUserName=(EditText)dialog.findViewById(R.id.editTextUserNameToLogin);
                final  EditText editTextPassword=(EditText)dialog.findViewById(R.id.editTextPasswordToLogin);
               
                Button btnSignIn=(Button)dialog.findViewById(R.id.buttonSignIn);
               
                // Set On ClickListener
                btnSignIn.setOnClickListener(new View.OnClickListener() {
                   
                    public void onClick(View v) {
                        // TODO Auto-generated method stub
                       
                        // get The User name and Password
                        String userName=editTextUserName.getText().toString();
                        String password=editTextPassword.getText().toString();
                       
                        // fetch the Password form database for respective user name
                        String storedPassword=loginDataBaseAdapter.getSinlgeEntry(userName);
                       
                        // check if the Stored password matches with  Password entered by user
                        if(password.equals(storedPassword))
                        {
                            Toast.makeText(HomeActivity.this, "Login Successfull", Toast.LENGTH_LONG).show();
                            dialog.dismiss();
                        }
                        else
                        {
                           
                            Toast.makeText(HomeActivity.this, "User Name and Does Not Matches", Toast.LENGTH_LONG).show();
                        }
                       
                    }
                });
               
           
                 dialog.show();
               
               
               
    }



    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
       
        // Close The Database
        loginDataBaseAdapter.close();
    }
 
   
}

2:  SignUpActivity.java


public class SignUPActivity extends Activity
{
   
            EditText editTextUserName,editTextPassword,editTextConfirmPassword;
            Button btnCreateAccount;
           
            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 Refferences of Views
                    editTextUserName=(EditText)findViewById(R.id.editTextUserName);
                    editTextPassword=(EditText)findViewById(R.id.editTextPassword);
                    editTextConfirmPassword=(EditText)findViewById(R.id.editTextConfirmPassword);
                   
                    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();
                           
                            // check if any of the fields are vaccant
                            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 Matches", Toast.LENGTH_LONG).show();
                                return;
                            }
                            else
                            {
                                    // Save the Data in Database
                                    loginDataBaseAdapter.insertEntry(userName, password);
                                    Toast.makeText(getApplicationContext(), "Account Successfully Created ", Toast.LENGTH_LONG).show();
                            }
                           
                           
                        }
                    });
            }
            
           
            @Override
            protected void onDestroy() {
                // TODO Auto-generated method stub
                super.onDestroy();
               
                loginDataBaseAdapter.close();
            }

}

3:  DataBaseHelper.java


package com.example.login;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class DataBaseHelper extends SQLiteOpenHelper
{
    public DataBaseHelper(Context context, String name,CursorFactory factory, int version)
    {
               super(context, name, factory, version);
    }
    // Called when no database exists in disk and the helper class needs
    // to create a new one.
    @Override
    public void onCreate(SQLiteDatabase _db)
    {
            _db.execSQL(LoginDataBaseAdapter.DATABASE_CREATE);
           
    }
    // Called when there is a database version mismatch meaning that the version
    // of the database on disk needs to be upgraded to the current version.
    @Override
    public void onUpgrade(SQLiteDatabase _db, int _oldVersion, int _newVersion)
    {
            // Log the version upgrade.
            Log.w("TaskDBAdapter", "Upgrading from version " +_oldVersion + " to " +_newVersion + ", which will destroy all old data");
   
   
            // Upgrade the existing database to conform to the new version. Multiple
            // previous versions can be handled by comparing _oldVersion and _newVersion
            // values.
            // The simplest case is to drop the old table and create a new one.
            _db.execSQL("DROP TABLE IF EXISTS " + "TEMPLATE");
            // Create a new one.
            onCreate(_db);
    }
   

}

4: LoginDataBaseAdapter.java


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);
            }

             // Method to openthe Database 
            public  LoginDataBaseAdapter open() throws SQLException
            {
                    db = dbHelper.getWritableDatabase();
                    return this;
            }
       
            // Method to close the Database 
            public void close()
            {
                    db.close();
            }
 
             // method returns an Instance of the Database
            public  SQLiteDatabase getDatabaseInstance()
            {
                    return db;
            }
   
              // method to insert a record in Table
            public void insertEntry(String userName,String password)
            {
                      
                    
                       ContentValues newValues = new ContentValues();
                        // Assign values for each column.
                        newValues.put("USERNAME", userName);
                        newValues.put("PASSWORD",password);
                      
                      
                      
                        // Insert the row into your table
                        db.insert("LOGIN", null, newValues);
                        Toast.makeText(context, "User Info Saved", Toast.LENGTH_LONG).show();
          
      
            }
          
           // method to delete a Record of UserName
            public int deleteEntry(String UserName)
            {
                    
                   String where="USERNAME=?";
                   int numberOFEntriesDeleted= db.delete("LOGIN", where, new String[]{UserName}) ;
                   Toast.makeText(context, "Number fo Entry Deleted Successfully : "+numberOFEntriesDeleted, Toast.LENGTH_LONG).show();
                return numberOFEntriesDeleted;
              
            }
      
       // method to get the password  of userName
        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
                    return "NOT EXIST";
                cursor.moveToFirst();
                String password= cursor.getString(cursor.getColumnIndex("PASSWORD"));
                return password;
              
          
        }

     // Method to Update an Existing Record
        public void  updateEntry(String userName,String password)
        {
                //  create object of ContentValues
                ContentValues updatedValues = new ContentValues();
                // Assign values for each Column.
                updatedValues.put("USERNAME", userName);
                updatedValues.put("PASSWORD",password);
              
                String where="USERNAME = ?";
                db.update("LOGIN",updatedValues, where, new String[]{userName});
             
        }
      
      
}




 

More Android Topics


               
New Advance Topics:                   Android LiveWallpaer Tutorial
Android ImageSwitcher                    Android TextSwitcher                                Android ViewFlipper
Android Gesture Detector               Handling/Detecting Swap Events                Gradient Drawable
Detecting Missed Calls                    Hide Title Bar                                           GridView Animation
Android AlarmManager                 Android BootReceiver                       Vibrate Phone In a Desirable Pattern    
Developing for Different Screen Sizes           Showing Toast for Longer Time       Publishing your App
How to publish Android App on Google Play

 Beginning With Android
      Android : Introduction(What is Android)                                                              Configuring Eclipse for Android Development
     Creating Your First Android Project                                           Understanding Android Manifest File of your android app

 Advance Android Topics                                                              Customizing Android Views


Working With Layouts                                                                Working With Views

Understanding Layouts in Android                                                   Using Buttons and EditText in Android
Working with Linear Layout (With Example)                                     Using CheckBoxes in Android
Nested Linear Layout (With Example)                                              Using AutoCompleteTextView in Android                                                                                          Grid View
Relative Layout In Android                                                               ListView
Table Layout                                                                                   Android ProgressBar
Frame Layout(With Example)                                                          Customizing ProgressBar
Absolute Layout                                                                             Customizing Radio Buttons
Grid Layout                                                                                    Customizing Checkboxes In Android

Android Components                                                                 Dialogs In Android

Activity In Android                                                                    Working With Alert Dialog
Activity Life Cycle                                                                    Adding Radio Buttons In Dialog
Starting Activity For Result                                                       Adding Check Boxes In Dialog
Sending Data from One Activity to Other in Android                    Creating Customized Dialogs in Android
Returning Result from Activity                                                   Creating Dialog To Collect User Input
Android : Service                                                                     DatePicker and TimePickerDialog
BroadcastReceiver                                                                   Using TimePickerDialog and DatePickerDialog In android

Menus In Android                                                                ListView:
Creating Option Menu                                                               Populating ListView With DataBase
Creating Context Menu In Android                                              Populating ListView with ArrayList
                                                                                               ListView with Custom Adapter

Toast                                                                                      Working With SMS
Customizing Toast In Android                                                       How to Send SMS in Android
Customizing the Display Time of Toast                                        How To Receive SMS
Customizing Toast At Runtime                                                  Accessing Inbox In Android
Adding Image in Toast
Showing Toast for Longer Time


TelephonyManager                                                            Storage: Storing Data In Android
Using Telephony Manager In Android                                          SharedPreferences In Android
                                                                                              Reading and Writing files to Internal Stoarage

Working With Incoming Calls                                       DataBase :  Introduction of SQLiteDataBase
How To Handle Incoming Calls in Android                                Working With Database in Android
How to Forward an Incoming Call In Android                            Creating Table In Android
CALL States In Android                                                          Inserting, Deleting and Updating Records In Table in Android


Miscellaneous
Notifications In Android
How To Vibrate The Android Phone
Sending Email In Android
Opening a webpage In Browser
How to Access PhoneBook In Android
Prompt User Input with an AlertDialog




Wednesday, March 20, 2013

How to Create DataBase in Android

In this Post I will discuss about creating your own database and writing  functions for Insertion, Deletion and Updation of Data in Table.


DataBaseHelper:

We will use  SQLiteOpenHelper  class and extend this class
and overside the methods  onCreate, onUpgrade

public class DataBaseHelper extends SQLiteOpenHelper
{
            public DataBaseHelper (Context context, String name,CursorFactory factory, int version)
            {
                       super(context, name, factory, version);
            }
            // Called when no database exists in disk and the helper class needs
            // to create a new one.

            @Override
            public void onCreate(SQLiteDatabase _db)
            {

                     // statement to create the Table
                    _db.execSQL(SMSBlockerDataBaseAdapter.DATABASE_CREATE);
                   
            }
            // Called when there is a database version mismatch meaning that the version
            // of the database on disk needs to be upgraded to the current version.

            @Override
            public void onUpgrade(SQLiteDatabase _db, int _oldVersion, int _newVersion)
            {
                    // Log the version upgrade.
                    Log.w("TaskDBAdapter", "Upgrading from version " +_oldVersion + " to " +_newVersion + ", which will destroy all old data");
           
           
                    // Upgrade the existing database to conform to the new version. Multiple
                    // previous versions can be handled by comparing _oldVersion and _newVersion
                    // values.
                    // The simplest case is to drop the old table and create a new one
.
                    _db.execSQL("DROP TABLE IF EXISTS " + "SMSTABLE");
                    // Create a new one.
                    onCreate(_db);
            }
           
}



SMSBlockerDataBaseAdapter


We create a DataBaseAdpater class and write the functions  for following tasks

  • to Open the database
  • to close the database
  • to insert a new Row/Record in Database
  • to delete one or more Records in Database
  • to update the database

In the example Code given below  I have created  a Table to store SMSes with following Columns

Id:   Primary Key of the Table
Sender Name:  Name of SMS Sender
Sender Number:  Phone Number of the Sender
Time:  date and time (In Miliseconds) at which SMS is received

Inserting  a new Record in table


To Insert  a new Record in Table  we need to create an Object of ContentValues  class and put the Values in this  like:

ContentValues newValues = new ContentValues();
                // Assign values for each row.
                newValues.put("COLUMN_NAME1", values);

              newValues.put("COLUMN_NAME2", values);

            and so on
then

// Insert the row into your table
                db.insert("TABLENAME", null, newValues);



Deleting a Record from Table


we can delete a row from the Table with delete method
delete("TABLE ANME",String where, String[]  valuesForWhere)

for Ex:
String where="ID=?";
                int numberOFEntriesDeleted= db.delete("BLOCKEDSMSTABLE", where, new String[]{ID}) ;


will delete the Record containing IDs in  new String[]{ID}  array.



To get All the Record in the Table


public Cursor getAllEntries ()
        {
             
                return db.query("BLOCKEDSMSTABLE", null,null, null, null, null, "TIME DESC");
        }

TIME DESC    will fetch in descending order of Time , Pass null to fetch in Ascending Order because by Deafault it fetches in ascending Order

To get 1 or more records depending on Some Condition


Task task=new Task();
                Cursor cursor=db.query("BLOCKEDSMSTABLE", null, " ID=?", new String[]{ID}, null, null, null);


"ID=?"       at RunTime ?  will be replaced by string in the Array OF String passed as 4th parameter
the above query will fetch all the records containing the IDs in String Array(4th parameter)


Updating The Table 

Updating is little similar to Inserting  a record in Table
to update the table we need to create an Object of  ContentValues  and put the new Values in ContentValues object

ContentValues updatedValues = new ContentValues();
                // Assign new values for each row.


                updatedValues.put("TIME", taskToBeUpdated.time);
                updatedValues.put("MESSAGE",taskToBeUpdated.message);
                updatedValues.put("RECIPIENTNUMBER",taskToBeUpdated.recipientNumber);
                updatedValues.put("RECIPIENTNAME", taskToBeUpdated.recipientName);
               
               
                String where="ID = ?";
                db.update("SMSTABLE",updatedValues, where, new String[]{ID});


You can Modify the where variable as per your requirement  like where "EMP_ID="  etc.


How to use this DataBaseAdapter Class  in Activities


Create an Instance of  DataBaseAdapter
Open the DataAbse
Call the Functions/Methods

See The Code :


SMSSchedulerDataBaseAdapter  smsSchedulerDataBaseAdapter =new SMSSchedulerDataBaseAdapter(this);
                    smsSchedulerDataBaseAdapter=smsSchedulerDataBaseAdapter.open();

smsSchedulerDataBaseAdapter.insertEntry(yourParameter);
smsSchedulerDataBaseAdapter.getAllEntries();


The Complete Code :


public class SMSBlockerDataBaseAdapter
{
         // Name of the database
        static final String DATABASE_NAME = "SMSBLOCKERDATABASE.db";

        // database version  if creating first time it should be 1      
        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 BLOCKEDSMSTABLE " +
                                         "( " +"ID integer primary key autoincrement,MESSAGE text, SENDERNUMBER text, SENDERNAME text, TIME integer ); ";
                                         
        // 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 SMSBlockerDataBaseAdapter(Context _context)
        {
                context = _context;
                dbHelper = new DataBaseHelper(context, DATABASE_NAME, null, DATABASE_VERSION);
        }
       
          // Open the Database
        public SMSBlockerDataBaseAdapter open() throws SQLException
        {
                db = dbHelper.getWritableDatabase();
                return this;
        }


         // Close the Database       
        public void close()
        {
                db.close();
        }
   
        public  SQLiteDatabase getDatabaseInstance()
        {
                return db;
        }
   
    // to Insert A record in Table
        public void insertEntry(Task taskToInsert)
        {
                // TODO: Create a new ContentValues to represent the row
                // and insert it into the database.
                ContentValues newValues = new ContentValues();
                // Assign values for each row.
                newValues.put("MESSAGE", taskToInsert.message);
                newValues.put("SENDERNUMBER",taskToInsert.senderNumber);
                newValues.put("SENDERNAME", taskToInsert.senderName);
                newValues.put("TIME",taskToInsert.time);
                               
               
                // Insert the row into your table
                db.insert("BLOCKEDSMSTABLE", null, newValues);
               
       
        }
        public int deleteEntry(String ID)
        {
               
           
                String where="ID=?";
                int numberOFEntriesDeleted= db.delete("BLOCKEDSMSTABLE", where, new String[]{ID}) ;
              
                return numberOFEntriesDeleted;
               
        }
       
        public void deleteOlderEntries()
        {
                  String olderTime=String.valueOf(new GregorianCalendar().getTimeInMillis()-7*24*60*60*1000);
                  String where="TIME < ?";
                  int numberOFEntriesDeleted= db.delete("BLOCKEDSMSTABLE", where, new String[]{olderTime}) ;
                  Toast.makeText(context, "Number Of Entries Deleted "+numberOFEntriesDeleted, Toast.LENGTH_LONG).show();
        }
        public Cursor getAllEntries ()
        {
              
                return db.query("BLOCKEDSMSTABLE", null,null, null, null, null, "TIME DESC");
        }
       
        public Task getSinlgeEntry(String ID)
        {
               
                Task task=new Task();
                Cursor cursor=db.query("BLOCKEDSMSTABLE", null, " ID=?", new String[]{ID}, null, null, null);
                if(cursor.getCount()==0)
                {
                   
                    return null;
                }
                cursor.moveToFirst();
                task.id= cursor.getString(cursor.getColumnIndex("ID"));
                task.message = cursor.getString(cursor.getColumnIndex("MESSAGE"));
                task.senderNumber = cursor.getString(cursor.getColumnIndex("SENDERNUMBER"));
                task.senderName = cursor.getString(cursor.getColumnIndex("SENDERNAME"));
                task.time = Long.parseLong(cursor.getString(cursor.getColumnIndex("TIME")));
                task.reason=cursor.getString(cursor.getColumnIndex("REASON"));
                //Log.i("getSingle Entry ID: "+"PhoneNumber "+task.senderName+"  "+task.message,ID);
                cursor.close();
                return task;
        }
}




Tuesday, March 12, 2013

Creating User Sign in Dialog In Android

Android Tutorials for Beginners

In this post we will develop an app in which a user can perform following task
1: User Can Create Account
2: User Can log in 

we will use and learn following this in this Post

Customized Dialog:  Here we have used  Customized Dialog   for User Login.
Creating DataBase:  Here we have created database for Storing   UserName and Password.
Writing functions for Inserting, Deleting, Updating and querying a Datbase.


we have create a Table with following Fields :

USERNAME :  to store the user name.
PASSWORD: to store the password of User

Table Name is LOGIN 


The Code is well commented  , just go through , you will understand easily.


Some More Good  Android Topics
Customizing Toast In Android 
 Showing Toast for Longer Time
Customizing Checkboxes In Android  
Customizing Progress Bar

 



  List of XMLs Used.



main.xml :   main screen
signup.xml : to create a new account
login.xml  :   to login


main.xml  



                          


    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center_vertical" >



    <Button
        android:id="@+id/buttonSignIN"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
         android:text="Sign IN"
         android:onClick="signIn"/>

    <Button
        android:id="@+id/buttonSignUP"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Sign UP" />

</LinearLayout>


signup.xml




<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center_vertical" >

    <EditText
        android:id="@+id/editTextUserName"
        android:hint="User Name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        >

        <requestFocus />
    </EditText>

    <EditText
        android:id="@+id/editTextPassword"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
         android:hint="Password"
        android:inputType="textPassword" />

    <EditText
        android:id="@+id/editTextConfirmPassword"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="Confirm Password"
        android:inputType="textPassword" />

    <Button
        android:id="@+id/buttonCreateAccount"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Create Account"
        android:layout_marginBottom="60dp" />
   
</LinearLayout>



login.xml




<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/editTextUserNameToLogin"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="User Name"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <EditText
        android:id="@+id/editTextPasswordToLogin"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textPassword"
        android:hint="Password" />

    <Button
        android:id="@+id/buttonSignIn"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Sign In" />

</LinearLayout>



Activities:


1:    HomeActivity.java


public class HomeActivity extends Activity
{
    
    Button btnSignIn,btnSignUp;
    LoginDataBaseAdapter loginDataBaseAdapter;
   
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
             super.onCreate(savedInstanceState);
             setContentView(R.layout.main);
            
             // create the instance of Databse
             loginDataBaseAdapter=new LoginDataBaseAdapter(this);
             loginDataBaseAdapter=loginDataBaseAdapter.open();
            
             // Get The Refference Of Buttons
             btnSignIn=(Button)findViewById(R.id.buttonSignIN);
             btnSignUp=(Button)findViewById(R.id.buttonSignUP);
            
          
           
            // Set OnClick Listener on SignUp button
             btnSignUp.setOnClickListener(new View.OnClickListener() {
                   
                    public void onClick(View v) {
                        // TODO Auto-generated method stub
                       
                        /// Create Intent for SignUpActivity  abd Start The Activity
                        Intent intentSignUP=new Intent(getApplicationContext(),SignUPActivity.class);
                        startActivity(intentSignUP);
                    }
                });
    }

   
    // Methos to handleClick Event of Sign In Button
    public void signIn(View V)
       {
               
              final Dialog dialog = new Dialog(HomeActivity.this);

                dialog.setContentView(R.layout.login);
                dialog.setTitle("Login");

                // get the Refferences of views
                final  EditText editTextUserName=(EditText)dialog.findViewById(R.id.editTextUserNameToLogin);
                final  EditText editTextPassword=(EditText)dialog.findViewById(R.id.editTextPasswordToLogin);
               
                Button btnSignIn=(Button)dialog.findViewById(R.id.buttonSignIn);
               
                // Set On ClickListener
                btnSignIn.setOnClickListener(new View.OnClickListener() {
                   
                    public void onClick(View v) {
                        // TODO Auto-generated method stub
                       
                        // get The User name and Password
                        String userName=editTextUserName.getText().toString();
                        String password=editTextPassword.getText().toString();
                       
                        // fetch the Password form database for respective user name
                        String storedPassword=loginDataBaseAdapter.getSinlgeEntry(userName);
                       
                        // check if the Stored password matches with  Password entered by user
                        if(password.equals(storedPassword))
                        {
                            Toast.makeText(HomeActivity.this, "Login Successfull", Toast.LENGTH_LONG).show();
                            dialog.dismiss();
                        }
                        else
                        {
                           
                            Toast.makeText(HomeActivity.this, "User Name and Does Not Matches", Toast.LENGTH_LONG).show();
                        }
                       
                    }
                });
               
           
                 dialog.show();
               
               
               
    }



    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
       
        // Close The Database
        loginDataBaseAdapter.close();
    }
 
   
}

2:  SignUpActivity.java


public class SignUPActivity extends Activity
{
   
            EditText editTextUserName,editTextPassword,editTextConfirmPassword;
            Button btnCreateAccount;
           
            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 Refferences of Views
                    editTextUserName=(EditText)findViewById(R.id.editTextUserName);
                    editTextPassword=(EditText)findViewById(R.id.editTextPassword);
                    editTextConfirmPassword=(EditText)findViewById(R.id.editTextConfirmPassword);
                   
                    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();
                           
                            // check if any of the fields are vaccant
                            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 Matches", Toast.LENGTH_LONG).show();
                                return;
                            }
                            else
                            {
                                    // Save the Data in Database
                                    loginDataBaseAdapter.insertEntry(userName, password);
                                    Toast.makeText(getApplicationContext(), "Account Successfully Created ", Toast.LENGTH_LONG).show();
                            }
                           
                           
                        }
                    });
            }
            
           
            @Override
            protected void onDestroy() {
                // TODO Auto-generated method stub
                super.onDestroy();
               
                loginDataBaseAdapter.close();
            }

}

3:  DataBaseHelper.java


package com.example.login;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class DataBaseHelper extends SQLiteOpenHelper
{
    public DataBaseHelper(Context context, String name,CursorFactory factory, int version)
    {
               super(context, name, factory, version);
    }
    // Called when no database exists in disk and the helper class needs
    // to create a new one.
    @Override
    public void onCreate(SQLiteDatabase _db)
    {
            _db.execSQL(LoginDataBaseAdapter.DATABASE_CREATE);
           
    }
    // Called when there is a database version mismatch meaning that the version
    // of the database on disk needs to be upgraded to the current version.
    @Override
    public void onUpgrade(SQLiteDatabase _db, int _oldVersion, int _newVersion)
    {
            // Log the version upgrade.
            Log.w("TaskDBAdapter", "Upgrading from version " +_oldVersion + " to " +_newVersion + ", which will destroy all old data");
   
   
            // Upgrade the existing database to conform to the new version. Multiple
            // previous versions can be handled by comparing _oldVersion and _newVersion
            // values.
            // The simplest case is to drop the old table and create a new one.
            _db.execSQL("DROP TABLE IF EXISTS " + "TEMPLATE");
            // Create a new one.
            onCreate(_db);
    }
   

}

4: LoginDataBaseAdapter.java


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);
            }

             // Method to openthe Database 
            public  LoginDataBaseAdapter open() throws SQLException
            {
                    db = dbHelper.getWritableDatabase();
                    return this;
            }
         
            // Method to close the Database 
            public void close()
            {
                    db.close();
            }
  
             // method returns an Instance of the Database
            public  SQLiteDatabase getDatabaseInstance()
            {
                    return db;
            }
   
              // method to insert a record in Table
            public void insertEntry(String userName,String password)
            {
                      
                    
                       ContentValues newValues = new ContentValues();
                        // Assign values for each column.
                        newValues.put("USERNAME", userName);
                        newValues.put("PASSWORD",password);
                      
                      
                      
                        // Insert the row into your table
                        db.insert("LOGIN", null, newValues);
                        Toast.makeText(context, "User Info Saved", Toast.LENGTH_LONG).show();
          
      
            }
          
           // method to delete a Record of UserName
            public int deleteEntry(String UserName)
            {
                    
                   String where="USERNAME=?";
                   int numberOFEntriesDeleted= db.delete("LOGIN", where, new String[]{UserName}) ;
                   Toast.makeText(context, "Number fo Entry Deleted Successfully : "+numberOFEntriesDeleted, Toast.LENGTH_LONG).show();
                return numberOFEntriesDeleted;
              
            }
      
       // method to get the password  of userName
        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
                    return "NOT EXIST";
                cursor.moveToFirst();
                String password= cursor.getString(cursor.getColumnIndex("PASSWORD"));
                return password;
              
          
        }

     // Method to Update an Existing Record
        public void  updateEntry(String userName,String password)
        {
                //  create object of ContentValues
                ContentValues updatedValues = new ContentValues();
                // Assign values for each Column.
                updatedValues.put("USERNAME", userName);
                updatedValues.put("PASSWORD",password);
              
                String where="USERNAME = ?";
                db.update("LOGIN",updatedValues, where, new String[]{userName});
             
        }
      
      
}




 

Advance Android Topics


                   Customizing Toast In Android 
                   Showing Toast for Longer Time
                   Customizing the Display Time of Toast
                   Using TimePickerDialog and DatePickerDialog In android
                   Animating A Button In Android
                    Populating ListView With DataBase

                    Customizing Checkboxes In Android 
                    Increasin Size of Checkboxes
                    Android ProgressBar
                    Designing For Different Screen Sizes
                    Handling Keyboard Events


More Android Topics:

Android : Introduction


       Eclipse Setup for Android Development

                     Configuring Eclipse for Android Development

          Begging With Android

                     Creating Your First Android Project
                     Understanding Android Manifest File of your android app


         Working With Layouts

                      Understanding Layouts in Android
                          Working with Linear Layout (With Example)
                                Nested Linear Layout (With Example)
                          Table Layout
                          Frame Layout(With Example)
                         Absolute Layout
                         Grid Layout


       Activity

                     Activity In Android
                     Activity Life Cycle
                     Starting Activity For Result
                     Sending Data from One Activity to Other in Android
                     Returning Result from Activity

     Working With Views

                     Using Buttons and EditText in Android 
                     Using CheckBoxes in Android 
                     Using AutoCompleteTextView in Android
                     Grid View

       Toast

                     Customizing Toast In Android
                     Customizing the Display Time of Toast
                     Customizing Toast At Runtime
                     Adding Image in Toast
                     Showing Toast for Longer Time

     Dialogs In Android

                     Working With Alert Dialog
                     Adding Radio Buttons In Dialog
                     Adding Check Boxes In Dialog
                     Creating Customized Dialogs in Android
                    Adding EditText in Dialog

                   Creating Dialog To Collect User Input

                 DatePicker and TimePickerDialog

                              Using TimePickerDialog and DatePickerDialog In android

    Working With SMS

                  How to Send SMS in Android
                  How To Receive SMS
                  Accessing Inbox In Android

    ListView:

               Populating ListView With DataBase

      Menus In Android

                    Creating Option Menu
                    Creating Context Menu In Android

      TelephonyManager

                    Using Telephony Manager In Android

     Working With Incoming Calls

                    How To Handle Incoming Calls in Android
                    How to Forward an Incoming Call In Android
                   CALL States In Android
 

    Miscellaneous

                   Notifications In Android
                   How To Vibrate The Android Phone
                   Sending Email In Android
                  Opening a webpage In Browser
                   How to Access PhoneBook In Android
                   Prompt User Input with an AlertDialog

   Storage:  Storing Data In Android


               Shared Prefferences  In Android

                             SharedPreferences In Android

               Files: File Handling In Android

                              Reading and Writing files to Internal Stoarage
                              Reading and Writing files to SD Card 
                           

                DataBase : Working With Database

                             Working With Database in Android
                             Creating Table In Android
                             Inserting, Deleting and Updating Records In Table in Android
                             How to Create DataBase in Android
                             Accessing Inbox In Android

     Animation In Android:

                  Animating A Button In Android