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Login and Register user with SQLite Database

1 ) Activity Login

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
                                            xmlns:tools="http://schemas.android.com/tools"
                                            android:id="@+id/nestedScrollView"
                                            android:layout_width="match_parent"
                                            android:layout_height="match_parent"
                                            android:background="@color/colorBackground"
                                            android:paddingBottom="20dp"
                                            android:paddingLeft="20dp"
                                            android:paddingRight="20dp"
                                            android:paddingTop="20dp"
                                            tools:context=".LoginActivity">

    <android.support.v7.widget.LinearLayoutCompat
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <android.support.design.widget.TextInputLayout
            android:id="@+id/textInputLayoutEmail"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="40dp">

            <android.support.design.widget.TextInputEditText
                android:id="@+id/textInputEditTextEmail"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="@string/hint_email"
                android:inputType="text"
                android:maxLines="1"
                android:textColor="@android:color/white" />
        </android.support.design.widget.TextInputLayout>

        <android.support.design.widget.TextInputLayout
            android:id="@+id/textInputLayoutPassword"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp">

            <android.support.design.widget.TextInputEditText
                android:id="@+id/textInputEditTextPassword"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="@string/hint_password"
                android:inputType="textPassword"
                android:maxLines="1"
                android:textColor="@android:color/white" />
        </android.support.design.widget.TextInputLayout>

        <android.support.v7.widget.AppCompatButton
            android:id="@+id/appCompatButtonLogin"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="40dp"
            android:background="@color/colorTextHint"
            android:text="@string/text_login" />

        <android.support.v7.widget.AppCompatTextView
            android:id="@+id/textViewLinkRegister"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="30dp"
            android:gravity="center"
            android:text="@string/text_not_member"
            android:textSize="16dp" />
    </android.support.v7.widget.LinearLayoutCompat>
</LinearLayout>

2 ) Activity Register

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
                                            xmlns:tools="http://schemas.android.com/tools"
                                            android:id="@+id/nestedScrollView"
                                            android:layout_width="match_parent"
                                            android:layout_height="match_parent"
                                            android:background="@color/colorBackground"
                                            android:paddingBottom="20dp"
                                            android:paddingLeft="20dp"
                                            android:paddingRight="20dp"
                                            android:paddingTop="20dp"
                                            tools:context=".LoginActivity">

    <android.support.v7.widget.LinearLayoutCompat
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <android.support.design.widget.TextInputLayout
            android:id="@+id/textInputLayoutName"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="40dp">

            <android.support.design.widget.TextInputEditText
                android:id="@+id/textInputEditTextName"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="@string/hint_name"
                android:inputType="text"
                android:maxLines="1"
                android:textColor="@android:color/black" />
        </android.support.design.widget.TextInputLayout>

        <android.support.design.widget.TextInputLayout
            android:id="@+id/textInputLayoutEmail"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp">

            <android.support.design.widget.TextInputEditText
                android:id="@+id/textInputEditTextEmail"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="@string/hint_email"
                android:inputType="text"
                android:maxLines="1"
                android:textColor="@android:color/black" />
        </android.support.design.widget.TextInputLayout>

        <android.support.design.widget.TextInputLayout
            android:id="@+id/textInputLayoutPassword"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp">

            <android.support.design.widget.TextInputEditText
                android:id="@+id/textInputEditTextPassword"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="@string/hint_password"
                android:inputType="textPassword"
                android:maxLines="1"
                android:textColor="@android:color/black" />
        </android.support.design.widget.TextInputLayout>

        <android.support.design.widget.TextInputLayout
            android:id="@+id/textInputLayoutConfirmPassword"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp">

            <android.support.design.widget.TextInputEditText
                android:id="@+id/textInputEditTextConfirmPassword"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="@string/hint_confirm_password"
                android:inputType="textPassword"
                android:maxLines="1"
                android:textColor="@android:color/black" />
        </android.support.design.widget.TextInputLayout>

        <android.support.v7.widget.AppCompatButton
            android:id="@+id/appCompatButtonRegister"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="40dp"
            android:background="@color/colorTextHint"
            android:text="@string/text_register" />

        <android.support.v7.widget.AppCompatTextView
            android:id="@+id/appCompatTextViewLoginLink"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="30dp"
            android:gravity="center"
            android:text="Already a member? Login"
            android:textSize="16dp" />
    </android.support.v7.widget.LinearLayoutCompat>
</android.support.v4.widget.NestedScrollView>

3 ) Database Handler

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

import com.example.discusit.sqlitedatabasedemowithapicalling.model.User;

import java.util.ArrayList;
import java.util.List;

public class DatabaseHelper extends SQLiteOpenHelper {

    // Database Version
    private static final int DATABASE_VERSION = 1;

    // Database Name
    private static final String DATABASE_NAME = "UserManager.db";

    // User table name
    private static final String TABLE_USER = "user";

    // User Table Columns names
    private static final String COLUMN_USER_ID = "user_id";
    private static final String COLUMN_USER_NAME = "user_name";
    private static final String COLUMN_USER_EMAIL = "user_email";
    private static final String COLUMN_USER_PASSWORD = "user_password";

    // create table sql query
    private String CREATE_USER_TABLE = "CREATE TABLE " + TABLE_USER + "("
            + COLUMN_USER_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," + COLUMN_USER_NAME + " TEXT,"
            + COLUMN_USER_EMAIL + " TEXT," + COLUMN_USER_PASSWORD + " TEXT" + ")";

    // drop table sql query
    private String DROP_USER_TABLE = "DROP TABLE IF EXISTS " + TABLE_USER;

    /**
     * Constructor
     *
     * @param context
     */
    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_USER_TABLE);
    }


    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

        //Drop User Table if exist
        db.execSQL(DROP_USER_TABLE);

        // Create tables again
        onCreate(db);

    }

    /**
     * This method is to create user record
     *
     * @param user
     */
    public void addUser(User user) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(COLUMN_USER_NAME, user.getName());
        values.put(COLUMN_USER_EMAIL, user.getEmail());
        values.put(COLUMN_USER_PASSWORD, user.getPassword());

        // Inserting Row
        db.insert(TABLE_USER, null, values);
        db.close();
    }

    /**
     * This method is to fetch all user and return the list of user records
     *
     * @return list
     */
    public List<User> getAllUser() {
        // array of columns to fetch
        String[] columns = {
                COLUMN_USER_ID,
                COLUMN_USER_EMAIL,
                COLUMN_USER_NAME,
                COLUMN_USER_PASSWORD
        };
        // sorting orders
        String sortOrder =
                COLUMN_USER_NAME + " ASC";
        List<User> userList = new ArrayList<User>();

        SQLiteDatabase db = this.getReadableDatabase();

        // query the user table
        /**
         * Here query function is used to fetch records from user table this function works like we use sql query.
         * SQL query equivalent to this query function is
         * SELECT user_id,user_name,user_email,user_password FROM user ORDER BY user_name;
         */
        Cursor cursor = db.query(TABLE_USER, //Table to query
                columns,    //columns to return
                null,        //columns for the WHERE clause
                null,        //The values for the WHERE clause
                null,       //group the rows
                null,       //filter by row groups
                sortOrder); //The sort order


        // Traversing through all rows and adding to list
        if (cursor.moveToFirst()) {
            do {
                User user = new User();
                user.setId(Integer.parseInt(cursor.getString(cursor.getColumnIndex(COLUMN_USER_ID))));
                user.setName(cursor.getString(cursor.getColumnIndex(COLUMN_USER_NAME)));
                user.setEmail(cursor.getString(cursor.getColumnIndex(COLUMN_USER_EMAIL)));
                user.setPassword(cursor.getString(cursor.getColumnIndex(COLUMN_USER_PASSWORD)));
                // Adding user record to list
                userList.add(user);
            } while (cursor.moveToNext());
        }
        cursor.close();
        db.close();

        // return user list
        return userList;
    }

    /**
     * This method to update user record
     *
     * @param user
     */
    public void updateUser(User user) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(COLUMN_USER_NAME, user.getName());
        values.put(COLUMN_USER_EMAIL, user.getEmail());
        values.put(COLUMN_USER_PASSWORD, user.getPassword());

        // updating row
        db.update(TABLE_USER, values, COLUMN_USER_ID + " = ?",
                new String[]{String.valueOf(user.getId())});
        db.close();
    }

    /**
     * This method is to delete user record
     *
     * @param user
     */
    public void deleteUser(User user) {
        SQLiteDatabase db = this.getWritableDatabase();
        // delete user record by id
        db.delete(TABLE_USER, COLUMN_USER_ID + " = ?",
                new String[]{String.valueOf(user.getId())});
        db.close();
    }

    /**
     * This method to check user exist or not
     *
     * @param email
     * @return true/false
     */
    public boolean checkUser(String email) {

        // array of columns to fetch
        String[] columns = {
                COLUMN_USER_ID
        };
        SQLiteDatabase db = this.getReadableDatabase();

        // selection criteria
        String selection = COLUMN_USER_EMAIL + " = ?";

        // selection argument
        String[] selectionArgs = {email};

        // query user table with condition
        /**
         * Here query function is used to fetch records from user table this function works like we use sql query.
         * SQL query equivalent to this query function is
         * SELECT user_id FROM user WHERE user_email = 'jack@androidtutorialshub.com';
         */
        Cursor cursor = db.query(TABLE_USER, //Table to query
                columns,                    //columns to return
                selection,                  //columns for the WHERE clause
                selectionArgs,              //The values for the WHERE clause
                null,                       //group the rows
                null,                      //filter by row groups
                null);                      //The sort order
        int cursorCount = cursor.getCount();
        cursor.close();
        db.close();

        if (cursorCount > 0) {
            return true;
        }

        return false;
    }

    /**
     * This method to check user exist or not
     *
     * @param email
     * @param password
     * @return true/false
     */
    public boolean checkUser(String email, String password) {

        // array of columns to fetch
        String[] columns = {
                COLUMN_USER_ID
        };
        SQLiteDatabase db = this.getReadableDatabase();
        // selection criteria
        String selection = COLUMN_USER_EMAIL + " = ?" + " AND " + COLUMN_USER_PASSWORD + " = ?";

        // selection arguments
        String[] selectionArgs = {email, password};

        // query user table with conditions
        /**
         * Here query function is used to fetch records from user table this function works like we use sql query.
         * SQL query equivalent to this query function is
         * SELECT user_id FROM user WHERE user_email = 'jack@androidtutorialshub.com' AND user_password = 'qwerty';
         */
        Cursor cursor = db.query(TABLE_USER, //Table to query
                columns,                    //columns to return
                selection,                  //columns for the WHERE clause
                selectionArgs,              //The values for the WHERE clause
                null,                       //group the rows
                null,                       //filter by row groups
                null);                      //The sort order

        int cursorCount = cursor.getCount();

        cursor.close();
        db.close();
        if (cursorCount > 0) {
            return true;
        }

        return false;
    }
}

4 ) Model Class

public class User {

    private int id;
    private String name;
    private String email;
    private String password;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

5 ) Login Activity

import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.TextInputEditText;
import android.support.design.widget.TextInputLayout;
import android.support.v4.widget.NestedScrollView;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.AppCompatButton;
import android.support.v7.widget.AppCompatTextView;
import android.view.View;
import android.widget.Toast;

import com.example.discusit.sqlitedatabasedemowithapicalling.db.DatabaseHelper;

public class LoginActivity extends AppCompatActivity implements View.OnClickListener {
    private final AppCompatActivity activity = LoginActivity.this;

    private NestedScrollView nestedScrollView;

    private TextInputLayout textInputLayoutEmail;
    private TextInputLayout textInputLayoutPassword;

    private TextInputEditText textInputEditTextEmail;
    private TextInputEditText textInputEditTextPassword;

    private AppCompatButton appCompatButtonLogin;

    private AppCompatTextView textViewLinkRegister;

    private DatabaseHelper databaseHelper;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        getSupportActionBar().hide();

        initViews();
        initListeners();
        initObjects();
    }

    /**
     * This method is to initialize views
     */
    private void initViews() {

        textInputLayoutEmail = (TextInputLayout) findViewById(R.id.textInputLayoutEmail);
        textInputLayoutPassword = (TextInputLayout) findViewById(R.id.textInputLayoutPassword);

        textInputEditTextEmail = (TextInputEditText) findViewById(R.id.textInputEditTextEmail);
        textInputEditTextPassword = (TextInputEditText) findViewById(R.id.textInputEditTextPassword);

        appCompatButtonLogin = (AppCompatButton) findViewById(R.id.appCompatButtonLogin);

        textViewLinkRegister = (AppCompatTextView) findViewById(R.id.textViewLinkRegister);

    }

    /**
     * This method is to initialize listeners
     */
    private void initListeners() {
        appCompatButtonLogin.setOnClickListener(this);
        textViewLinkRegister.setOnClickListener(this);
    }

    /**
     * This method is to initialize objects to be used
     */
    private void initObjects() {
        databaseHelper = new DatabaseHelper(activity);
    }

    /**
     * This implemented method is to listen the click on view
     *
     * @param v
     */
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.appCompatButtonLogin:
                verifyFromSQLite();
                break;
            case R.id.textViewLinkRegister:
                // Navigate to RegisterActivity
                Intent intentRegister = new Intent(getApplicationContext(), RegisterActivity.class);
                startActivity(intentRegister);
                break;
        }
    }

    /**
     * This method is to validate the input text fields and verify login credentials from SQLite
     */
    private void verifyFromSQLite() {
        if (databaseHelper.checkUser(textInputEditTextEmail.getText().toString().trim()
                , textInputEditTextPassword.getText().toString().trim())) {


            Intent accountsIntent = new Intent(activity, MainActivity.class);
            accountsIntent.putExtra("EMAIL", textInputEditTextEmail.getText().toString().trim());
            emptyInputEditText();
            startActivity(accountsIntent);


        } else {
            Toast.makeText(activity, LoginActivity.this.getResources().getString(R.string.error_message_email), Toast
                    .LENGTH_SHORT)
                    .show();
        }
    }

    /**
     * This method is to empty all input edit text
     */
    private void emptyInputEditText() {
        textInputEditTextEmail.setText(null);
        textInputEditTextPassword.setText(null);
    }
}

6 ) Register Activity

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.design.widget.Snackbar;
import android.support.design.widget.TextInputEditText;
import android.support.design.widget.TextInputLayout;
import android.support.v4.widget.NestedScrollView;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.AppCompatButton;
import android.support.v7.widget.AppCompatTextView;
import android.view.View;

import com.example.discusit.sqlitedatabasedemowithapicalling.db.DatabaseHelper;
import com.example.discusit.sqlitedatabasedemowithapicalling.model.User;

public class RegisterActivity extends AppCompatActivity implements View.OnClickListener {

    private final AppCompatActivity activity = RegisterActivity.this;

    private NestedScrollView nestedScrollView;

    private TextInputLayout textInputLayoutName;
    private TextInputLayout textInputLayoutEmail;
    private TextInputLayout textInputLayoutPassword;
    private TextInputLayout textInputLayoutConfirmPassword;

    private TextInputEditText textInputEditTextName;
    private TextInputEditText textInputEditTextEmail;
    private TextInputEditText textInputEditTextPassword;
    private TextInputEditText textInputEditTextConfirmPassword;

    private AppCompatButton appCompatButtonRegister;
    private AppCompatTextView appCompatTextViewLoginLink;

    private DatabaseHelper databaseHelper;
    private User user;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);
        getSupportActionBar().hide();
        initViews();
        initListeners();
        initObjects();
    }

    /**
     * This method is to initialize views
     */
    private void initViews() {
        nestedScrollView = (NestedScrollView) findViewById(R.id.nestedScrollView);

        textInputLayoutName = (TextInputLayout) findViewById(R.id.textInputLayoutName);
        textInputLayoutEmail = (TextInputLayout) findViewById(R.id.textInputLayoutEmail);
        textInputLayoutPassword = (TextInputLayout) findViewById(R.id.textInputLayoutPassword);
        textInputLayoutConfirmPassword = (TextInputLayout) findViewById(R.id.textInputLayoutConfirmPassword);

        textInputEditTextName = (TextInputEditText) findViewById(R.id.textInputEditTextName);
        textInputEditTextEmail = (TextInputEditText) findViewById(R.id.textInputEditTextEmail);
        textInputEditTextPassword = (TextInputEditText) findViewById(R.id.textInputEditTextPassword);
        textInputEditTextConfirmPassword = (TextInputEditText) findViewById(R.id.textInputEditTextConfirmPassword);

        appCompatButtonRegister = (AppCompatButton) findViewById(R.id.appCompatButtonRegister);

        appCompatTextViewLoginLink = (AppCompatTextView) findViewById(R.id.appCompatTextViewLoginLink);

    }

    /**
     * This method is to initialize listeners
     */
    private void initListeners() {
        appCompatButtonRegister.setOnClickListener(this);
        appCompatTextViewLoginLink.setOnClickListener(this);

    }

    /**
     * This method is to initialize objects to be used
     */
    private void initObjects() {
        databaseHelper = new DatabaseHelper(activity);
        user = new User();

    }

    /*
     * This implemented method is to listen the click on view
     *
     * @param v
     */
    @Override
    public void onClick(View v) {
        switch (v.getId()) {

            case R.id.appCompatButtonRegister:
                postDataToSQLite();
                break;

            case R.id.appCompatTextViewLoginLink:
                finish();
                break;
        }
    }

    /**
     * This method is to validate the input text fields and post data to SQLite
     */
    private void postDataToSQLite() {
        if (!databaseHelper.checkUser(textInputEditTextEmail.getText().toString().trim())) {

            user.setName(textInputEditTextName.getText().toString().trim());
            user.setEmail(textInputEditTextEmail.getText().toString().trim());
            user.setPassword(textInputEditTextPassword.getText().toString().trim());

            databaseHelper.addUser(user);

            // Snack Bar to show success message that record saved successfully
            Snackbar.make(nestedScrollView, getString(R.string.success_message), Snackbar.LENGTH_LONG).show();
            emptyInputEditText();


        } else {
            // Snack Bar to show error message that record already exists
            Snackbar.make(nestedScrollView, getString(R.string.error_email_exists), Snackbar.LENGTH_LONG).show();
        }


    }

    /**
     * This method is to empty all input edit text
     */
    private void emptyInputEditText() {
        textInputEditTextName.setText(null);
        textInputEditTextEmail.setText(null);
        textInputEditTextPassword.setText(null);
        textInputEditTextConfirmPassword.setText(null);
    }
}

7 ) String XML

<resources>
    <string name="app_name">SQLiteDatabaseDemoWithAPICalling</string>
    <string name="text_accounts">All Accounts</string>
    <string name="hint_name">Name</string>
    <string name="hint_email">Email</string>
    <string name="hint_password">Password</string>
    <string name="hint_confirm_password">Confirm Password</string>
    <string name="text_login">Login</string>
    <string name="text_register">Register</string>
    <string name="error_message_name">Enter Full Name</string>
    <string name="error_message_email">Enter Valid Email</string>
    <string name="error_message_age">Enter Age</string>
    <string name="error_message_password">Enter Password</string>
    <string name="success_message">Registration Successful</string>
    <string name="text_not_member">No account yet? Create one</string>
    <string name="text_already_member">Already a member? Login</string>
    <string name="error_email_exists">Email Already Exists</string>
    <string name="error_password_match">Password Does Not Matches</string>
    <string name="error_valid_email_password">Wrong Email or Password</string>
    <string name="action_settings">Settings</string>
    <string name="text_hello">Hello,</string>
    <string name="text_title">Android Demo</string>
</resources>

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