Android MS SQL Database – Create Login App

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This is a continuation post on explaining android connection to MS SQL Database using jtds jar library. This post is about How to create Login screen in android using SQL Database.  For connecting Android with MySQL server, see this post.

Download Source code.

In previously created signup.xml file we will add new button for Login process. User can use this after successful signup process.

Changes are as below:

res > layout > signup.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/lvparent"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="5dp">


    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="50dp"
        android:orientation="horizontal"
        android:padding="5dp">

        <ImageView
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:layout_gravity="center_vertical"
            android:src="@drawable/user" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_marginRight="5dp"
            android:fontFamily="sans-serif-black"
            android:gravity="center_horizontal"
            android:text="USER SIGN UP"
            android:textColor="@color/colorPrimary"
            android:textSize="25sp" />
    </LinearLayout>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:gravity="start"
        android:text="Enter Email Address"
        android:textSize="16sp" />

    <EditText
        android:id="@+id/edtEmailAddress"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="2dp"
        android:background="@drawable/myedittextbg"
        android:hint="Email Address"
        android:padding="5dp"
        android:textColor="#2d3436" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:gravity="start"
        android:text="Password"
        android:textSize="16sp" />

    <EditText
        android:id="@+id/edtPassword"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="2dp"
        android:background="@drawable/myedittextbg"
        android:hint="Enter Password"
        android:inputType="textPassword"
        android:padding="5dp"
        android:textColor="#2d3436" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:gravity="start"
        android:text="Confirm Password"
        android:textSize="16sp" />

    <EditText
        android:id="@+id/edtConfirmPassword"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="2dp"
        android:background="@drawable/myedittextbg"
        android:hint="Confirm Password"
        android:inputType="textPassword"
        android:padding="5dp"
        android:textColor="#2d3436" />

    <Button
        android:id="@+id/btnSignUp"
        android:layout_width="250dp"
        android:layout_height="34dp"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="20dp"
        android:background="@color/colorPrimary"
        android:text="SIGN UP"
        android:textColor="#fff" />

    <Button
        android:id="@+id/btnSignIn"
        android:layout_width="250dp"
        android:layout_height="34dp"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="20dp"
        android:background="@color/colorLightGray"
        android:onClick="Login"
        android:text="Login"
        android:textColor="#000" />


    <ProgressBar
        android:id="@+id/pbbar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal" />
</LinearLayout>

Now edit the signup.java file as below:

signup.java:

package com.app.myapplication;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.media.tv.TvContract;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.StrictMode;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.Spinner;
import android.widget.Toast;

public class signup extends AppCompatActivity {

    EditText edtEmailAddress, edtPassword, edtConfirmPassword;
    Button btnSignUp;
    ProgressBar progressBar;
    LinearLayout lvparent;

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

        edtEmailAddress = findViewById(R.id.edtEmailAddress);
        edtPassword = findViewById(R.id.edtPassword);
        edtConfirmPassword = findViewById(R.id.edtConfirmPassword);
        btnSignUp = findViewById(R.id.btnSignUp);
        progressBar = findViewById(R.id.pbbar);
        lvparent = findViewById(R.id.lvparent);
        this.setTitle("User SignUp");

        btnSignUp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if (isEmpty(edtEmailAddress.getText().toString()) ||
                        isEmpty(edtPassword.getText().toString()) ||
                        isEmpty(edtConfirmPassword.getText().toString()))
                    ShowSnackBar("Please enter all fields");
                else if (!edtPassword.getText().toString().equals(edtConfirmPassword.getText().toString()))
                    ShowSnackBar("Password does not match");
                else {
                    AddUsers addUsers = new AddUsers();
                    addUsers.execute("");
                }

            }
        });
    }

    public void ShowSnackBar(String message) {
        Snackbar.make(lvparent, message, Snackbar.LENGTH_LONG)
                .setAction("CLOSE", new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {

                    }
                })
                .setActionTextColor(getResources().getColor(android.R.color.holo_red_light))
                .show();
    }

    public Boolean isEmpty(String strValue) {
        if (strValue == null || strValue.trim().equals(("")))
            return true;
        else
            return false;
    }

    private class AddUsers extends AsyncTask<String, Void, String> {
        String emailId, password;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();

            emailId = edtEmailAddress.getText().toString();
            password = edtPassword.getText().toString();
            progressBar.setVisibility(View.VISIBLE);
            btnSignUp.setVisibility(View.GONE);
        }

        @Override
        protected String doInBackground(String... params) {

            try {
                ConnectionHelper con = new ConnectionHelper();
                Connection connect = ConnectionHelper.CONN();

                String queryStmt = "Insert into tblUsers " +
                        " (UserId,Password,UserRole) values "
                        + "('"
                        + emailId
                        + "','"
                        + password
                        + "','User')";

                PreparedStatement preparedStatement = connect
                        .prepareStatement(queryStmt);

                preparedStatement.executeUpdate();

                preparedStatement.close();

                return "Added successfully";
            } catch (SQLException e) {
                e.printStackTrace();
                return e.getMessage().toString();
            } catch (Exception e) {
                return e.getMessage().toString();
            }
        }

        @Override
        protected void onPostExecute(String result) {

            //Toast.makeText(signup.this, result, Toast.LENGTH_SHORT).show();
            ShowSnackBar(result);
            progressBar.setVisibility(View.GONE);
            btnSignUp.setVisibility(View.VISIBLE);
            if (result.equals("Added successfully")) {
                // Clear();
            }

        }

    }

    public void Login(View v) {
        Intent i = new Intent(signup.this, Login.class);
        startActivity(i);
    }

}

The Login method will call our Login page.

Add two new layout file with names:

  1. login.xml
  2. activity_main.xml

in the layout folder and edit them as below.

First, please add two new colors in the colors.xml file as below:

res > values > colors.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#1595e4</color>
    <color name="colorPrimaryDark">#023250</color>
    <color name="colorAccent">#D81B60</color>
    <color name="colorLightGray">#CFCFCF</color>
</resources>

res > layout > login.xml

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


    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="2dp"
        android:gravity="center_horizontal"
        android:text="USER LOGIN"
        android:textSize="25sp" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="2dp"
        android:text="Enter your UserID"
        android:textSize="16sp" />

    <EditText
        android:id="@+id/edtEmailAddress"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="2dp"
        android:background="@drawable/myedittextbg"
        android:hint="Enter your UserID"
        android:padding="5dp" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="2dp"
        android:text="Password"
        android:textSize="16sp" />

    <EditText
        android:id="@+id/edtPassword"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="2dp"
        android:background="@drawable/myedittextbg"
        android:hint="Enter your Password"
        android:padding="5dp" />

    <Button
        android:id="@+id/btnLogin"
        android:layout_width="wrap_content"
        android:layout_height="34dp"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="20dp"
        android:padding="5dp"emai
        android:background="@color/colorLightGray"
        android:text="LOGIN"
        android:onClick="DoLogin"/>

    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal" />
</LinearLayout>
android ms sql database server connection login screen

android ms sql database server connection login screen

This file will be used for performing the login process.

res > layout > activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/lblEmailAddress"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>
android ms sql database server connection dashboard screen

android ms sql database server connection dashboard screen

This layout will be shown after successful login process to the user with email address from SharedPreferences.

Now let’s create methods for performing connection with MS SQL server database and login in the users.

Create a new java class file in your project with name Login.java and edit it as below:

Login.java:

package com.app.myapplication;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ProgressBar;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class Login extends AppCompatActivity {

    EditText edtEmailAddress, edtPassword;
    Button btnLogin;
    ProgressBar progressBar;
    LinearLayout lvparent;

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

        edtEmailAddress = findViewById(R.id.edtEmailAddress);
        edtPassword = findViewById(R.id.edtPassword);
        btnLogin = findViewById(R.id.btnLogin);
        lvparent = findViewById(R.id.lvparent);

        progressBar = findViewById(R.id.progressBar);
    }


    private class DoLoginForUser extends AsyncTask<String, Void, String> {
        String emailId, password;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();

            emailId = edtEmailAddress.getText().toString();
            password = edtPassword.getText().toString();
            progressBar.setVisibility(View.VISIBLE);
            btnLogin.setVisibility(View.GONE);
        }

        @Override
        protected String doInBackground(String... params) {

            try {
                ConnectionHelper con = new ConnectionHelper();
                Connection connect = ConnectionHelper.CONN();

                String query = "Select * from tblUsers where UserId='" + emailId + "'";
                PreparedStatement ps = connect.prepareStatement(query);

                Log.e("query",query);
                ResultSet rs = ps.executeQuery();
                if (rs.next()) {
                    String passcode = rs.getString("password");
                    connect.close();
                    rs.close();
                    ps.close();
                    if (passcode != null && !passcode.trim().equals("") && passcode.equals(password))
                        return "success";
                    else
                        return "Invalid Credentials";

                } else
                    return "User does not exists.";
            } catch (SQLException e) {

                return "Error:" + e.getMessage().toString();
            } catch (Exception e) {
                return "Error:" + e.getMessage().toString();
            }
        }

        @Override
        protected void onPostExecute(String result) {

            //Toast.makeText(signup.this, result, Toast.LENGTH_SHORT).show();
            ShowSnackBar(result);
            progressBar.setVisibility(View.GONE);
            btnLogin.setVisibility(View.VISIBLE);
            if (result.equals("success")) {
                SharedPreferences sharedPreferences = getApplicationContext().getSharedPreferences("userdetails",0);
                SharedPreferences.Editor editor = sharedPreferences.edit();

                editor.putString("email",edtEmailAddress.getText().toString());

                editor.commit();

                Intent i = new Intent(Login.this, MainActivity.class);
                startActivity(i);

            } else {
                ShowSnackBar(result);
            }
        }
    }

    public void ShowSnackBar(String message) {
        Snackbar.make(lvparent, message, Snackbar.LENGTH_LONG)
                .setAction("CLOSE", new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {

                    }
                })
                .setActionTextColor(getResources().getColor(android.R.color.holo_red_light))
                .show();
    }

    public void DoLogin(View v)
    {
        DoLoginForUser login = new DoLoginForUser();
        login.execute("");
    }

}

The DoLoginForUser async process will be called on clicking the login button. It will check for the emailId in the sql database table using jtds ResultSets. Upon getting data from sql database, we are comparing the password if it matches or not. On success, we will store the user email address from sql database in Android SharedPreferences and move on to next activity. Now create a new class file with MainActivity.java and edit it as below:

MainActivity.java:

package com.app.myapplication;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    TextView lblEmail;

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

        lblEmail = findViewById(R.id.lblEmailAddress);


        SharedPreferences sharedPreferences = getApplicationContext().getSharedPreferences("userdetails",0);

        lblEmail.setText(sharedPreferences.getString("email","0"));
    }
}

This file will simply display email address of the user stored in Android SharedPreferences at Login task.

Please edit your AndroidManifest.xml file and add newly created activities name in android manifest file or else you will get run time exception.

AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.app.myapplication">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />


    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".signup"
            android:screenOrientation="portrait"
            android:label="@string/app_name"
            android:theme="@style/AppTheme">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity
            android:name=".MainActivity"
            android:screenOrientation="portrait"
            android:label="@string/app_dashboard"
            />

        <activity
            android:name=".Login"
            android:screenOrientation="portrait"
            android:label="@string/app_login"
            />

    </application>

</manifest>

Download Source code.

Also see related to Android connection with MS SQL database:

  1. Using stored procedure in Android from MS SQL Server.
  2. Bind Android Spinner using MS SQL Database.
  3. Android GridView using MS SQL Database.
  4. Filling data in Android Listview using MS SQL Database.
  5. Storing Images in MS SQL database in Base64 string values using Android
  6. Retrieving Images from MS SQL Database in Android.
  7. Storing images using ASP.NET webservice in MS SQL database from Android
  8. Android Login Application using MS SQL Server and SharedPreferences