Login and Registration using SQLite

csdevbin
This is a good example of login  and Sign up page using SQLite.

In this project, we have 3 activities and 2  java classes.

 Contact.java
 DatabaseHelper.java

 Display.java
 MainActivity.java
 SignUp.java


















activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.blogspot.csdevbin.sqliteexample.MainActivity">

    <EditText
        android:id="@+id/editText_u"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="91dp"
        android:hint="Username" />

    <EditText
        android:id="@+id/editText_p"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/editText_u"
        android:ems="10"
        android:hint="Password"
        android:inputType="textPassword" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentStart="true"
        android:layout_centerVertical="true"
        android:onClick="onSignIn"
        android:text="Log in" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"

        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/button"
        android:layout_marginTop="48dp"
        android:text="Sign up" />
</RelativeLayout>


activity_signup.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.blogspot.csdevbin.sqliteexample.SignUp">

    <EditText
        android:id="@+id/editText_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="58dp"
        android:hint="Name" />

    <EditText
        android:id="@+id/editText_email"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/editText_name"
        android:ems="10"
        android:hint="E-mail"
        android:inputType="textEmailAddress" />

    <EditText
        android:id="@+id/editText_uname"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/editText_email"
        android:hint="Username" />

    <EditText
        android:id="@+id/editText_pass"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/editText_uname"
        android:ems="10"
        android:hint="Password"
        android:inputType="textPassword" />

    <EditText
        android:id="@+id/editText_confirmpass"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/editText_pass"
        android:ems="10"
        android:hint="Confirm Password"
        android:inputType="textPassword" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/editText_confirmpass"
        android:layout_marginTop="50dp"
        android:onClick="onSignUp"
        android:text="Sign up" />
</RelativeLayout>


activity_display
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.blogspot.csdevbin.sqliteexample.Display">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Large Text"
        android:id="@+id/textView"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="57dp"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />
</RelativeLayout>

Contact.java
package com.blogspot.csdevbin.sqliteexample;

/** * Created by DeskTop on 4/21/2016. */
public class Contact {
    int id;
    String name, email, uname, pass;

    public void setName(String name){
        this.name=name;
    }
    public String getName(){
        return this.name;
    }
    public void setEmail(String email){
        this.email=email;
    }
    public String getEmail(){
        return this.email;
    }
    public void setUname(String uname){
        this.uname=uname;
    }
    public String getUname(){
        return this.uname;
    }
    public void setPass(String pass){
        this.pass=pass;
    }
    public String getPass(){
        return this.pass;
    }
}


DatabaseHelper.java

package com.blogspot.csdevbin.sqliteexample;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class DatabaseHelper extends SQLiteOpenHelper {
    private static final int DATABASE_VERSION = 1;
    private static final String DATABASE_NAME = "contact.db";
    private static final String TABLE_NAME = "contacts";
    private static final String COLUMN_ID = "id";
    private static final String COLUMN_NAME = "name";
    private static final String COLUMN_EMAIL = "email";
    private static final String COLUMN_UNAME = "uname";
    private static final String COLUMN_PASS = "pass";

    SQLiteDatabase db;
    private static final String TABLE_CREATE = "create table contacts
(id integer primary key not null ," +
            "name text not null , email text not null
 ,uname text not null ,pass text not null);";

    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    public void onCreate(SQLiteDatabase db) {

        db.execSQL(TABLE_CREATE);
        this.db = db;
    }
    public void insertContact(Contact c) {

        db = this.getWritableDatabase();
        ContentValues values = new ContentValues();

        String query ="select * from contacts";
        Cursor cursor = db.rawQuery(query,null);
        int count =cursor.getCount();
        values.put(COLUMN_ID,count);
        values.put(COLUMN_NAME, c.getName());
        values.put(COLUMN_EMAIL, c.getEmail());
        values.put(COLUMN_UNAME, c.getUname());
        values.put(COLUMN_PASS, c.getPass());

        db.insert(TABLE_NAME, null, values);
        db.close();
    }
    public String searchPass(String uname) {

        db = this.getReadableDatabase();
        String query = "select uname, pass from " + TABLE_NAME;
        Cursor cursor = db.rawQuery(query, null);
        String a, b;
        b = "not found";

        if (cursor.moveToFirst()) {
            do {
                a = cursor.getString(0);
                if (a.equals(uname))
                {
                    b = cursor.getString(1);
                    break;
                }
            }
            while (cursor.moveToNext());
        }
        return b;
    }
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        String query = "DROP TABLE IF EXISTS " + TABLE_NAME;
                                db.execSQL(query);
        this.onCreate(db);
    }
}
MainActivity.java

package com.blogspot.csdevbin.sqliteexample;
import android.content.Intent;
import android.opengl.EGLDisplay;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
    DatabaseHelper helper = new DatabaseHelper(this);
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button b = (Button) findViewById(R.id.button2);
        b.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View v) {
                Intent in = new Intent(MainActivity.this, SignUp.class);
                startActivity(in);
            }
        });
    }
    public void onSignIn(View v) {
        if (v.getId() == R.id.button) {
            EditText u = (EditText) findViewById(R.id.editText_u);
            String str = u.getText().toString();
            EditText p = (EditText) findViewById(R.id.editText_p);
            String pass = p.getText().toString();
            String password = helper.searchPass(str);
            if (pass.equals(password)) {
                Intent in = new Intent(MainActivity.this, Display.class);
                in.putExtra("Username", str);
                startActivity(in);
            } else {
                Toast.makeText(MainActivity.this, "Username and Password
doesn't matched", Toast.LENGTH_SHORT)
                        .show();
            }
        }
    }
}

SignUp.java

package com.blogspot.csdevbin.sqliteexample;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class SignUp extends AppCompatActivity {
    DatabaseHelper helper = new DatabaseHelper(this);
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sign_up);
    }
    public void onSignUp(View v) {
        if (v.getId() == R.id.button3) {
            EditText name = (EditText) findViewById(R.id.editText_name);
            EditText email = (EditText) findViewById(R.id.editText_email);
            EditText uname = (EditText) findViewById(R.id.editText_uname);
            EditText pass = (EditText) findViewById(R.id.editText_pass);
            EditText confirmpass = (EditText) findViewById(R.id.editText_confirmpass);
            String namestr = name.getText().toString();
            String emailstr = email.getText().toString();
            String unamestr = uname.getText().toString();
            String passstr = pass.getText().toString();
            String confirmpassstr = confirmpass.getText().toString();
            if (!passstr.equals(confirmpassstr)) {
                Toast.makeText(SignUp.this, "Password doesn't matched", Toast.LENGTH_SHORT)
                        .show();
            } else {
                Intent in = new Intent(SignUp.this, MainActivity.class);
                Contact c = new Contact();
                c.setName(namestr);
                c.setEmail(emailstr);
                c.setUname(unamestr);
                c.setPass(passstr);
                helper.insertContact(c);
                Toast.makeText(SignUp.this,"Sign up successful",Toast.LENGTH_SHORT).show();
                startActivity(in);
            }
        }
    }
}

Display.java
package com.blogspot.csdevbin.sqliteexample;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
public class Display extends AppCompatActivity {
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_display);
        TextView tv = (TextView)findViewById(R.id.textView);
       Intent in =getIntent();
        String str =in.getStringExtra("Username");
        tv.setText(str);
    }
}

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