Login app in android studio with source code

 How to make a login application in android studio?

we will make a Material design login form.

In the previous blog post, we learned how to make a simple login form using the SQLite database.

 we will create some advanced login forms with user validation.

In this blog post, I will show you how to create a Material Design login form using the SQLite database in Android Studio.

We will create some different login forms using Materia design in Android Studio.

First, we will create the main activity signup activity, login activity and last welcome activity.

You will use login or sign in by email id.

How to create a simple android login app

Fire android studio

your project name

Choose API lavel

After choosing Java Language because we will create a login app in java.

In the default main activity, we will create a home page and put 2 buttons one is login and another is signup button.

First, we will create a database file using SQLiteOpenHelper class. 

DBmain.java

package com.pd.loginsqlite;

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

import androidx.annotation.Nullable;

public class DBmain extends SQLiteOpenHelper {
    private static final String DB_NAME="student.db";
    private static final String TABLE_NAME="course";
    private static final String KEY_NAME="username";
    private static final String KEY_EMAIL="email";
    private static final String KEY_PASS="password";
    private static final int VER=1;
    Context c;
    public DBmain(@Nullable Context context) {
        super(context, DB_NAME, null, VER);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        try{
            db.execSQL("create table "+TABLE_NAME+"("+KEY_NAME+" text,"+KEY_EMAIL+" text,"+KEY_PASS+" text)");
            Toast.makeText(c, "table creation successfully", Toast.LENGTH_SHORT).show();
        }catch (Exception e){
            Log.e("DBmai","table not creation",e);
        }
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    db.execSQL("drop table if exists "+TABLE_NAME+"");
    onCreate(db);
    }
}
package com.pd.loginsqlite;

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

import androidx.annotation.Nullable;

public class DBmain extends SQLiteOpenHelper {
    private static final String DB_NAME="student.db";
    private static final String TABLE_NAME="course";
    private static final String KEY_NAME="username";
    private static final String KEY_EMAIL="email";
    private static final String KEY_PASS="password";
    private static final int VER=1;
    Context c;
    public DBmain(@Nullable Context context) {
        super(context, DB_NAME, null, VER);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        try{
            db.execSQL("create table "+TABLE_NAME+"("+KEY_NAME+" text,"+KEY_EMAIL+" text,"+KEY_PASS+" text)");
            Toast.makeText(c, "table creation successfully", Toast.LENGTH_SHORT).show();
        }catch (Exception e){
            Log.e("DBmai","table not creation",e);
        }
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    db.execSQL("drop table if exists "+TABLE_NAME+"");
    onCreate(db);
    }
}

After we will create a home page in the MainActvity. 

MainActivity.java

package com.pd.loginsqlite;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {

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

    public void Login(View view) {
        Intent intent=new Intent(MainActivity.this,LoginForm.class);
        startActivity(intent);
    }

    public void SignUp(View view) {
        Intent intent=new Intent(MainActivity.this,SignUpForm.class);
        startActivity(intent);
    }
}

In the XML file, we will use the buttons widget to display buttons. 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:background="@drawable/loginbg"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:onClick="Login"
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Login"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.445"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button2"
        app:layout_constraintVertical_bias="0.098" />

    <Button
        android:onClick="SignUp"
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="300dp"
        android:text="SignUp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.445"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

Then after we will create new empty activity named.

SignUpForm.java

package com.pd.loginsqlite;

import androidx.appcompat.app.AppCompatActivity;

import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Patterns;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.google.android.material.textfield.TextInputEditText;

import org.w3c.dom.Text;

public class SignUpForm extends AppCompatActivity {
TextInputEditText eusername,eemail,epassword,erepassword;
Button ebutton;
DBmain db;
SQLiteDatabase sq;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sign_up_form);

        eusername=(TextInputEditText)findViewById(R.id.username);
        eemail=(TextInputEditText)findViewById(R.id.useremail);
        epassword=(TextInputEditText)findViewById(R.id.password);
        erepassword=(TextInputEditText)findViewById(R.id.confirm_pass);
        ebutton=(Button)findViewById(R.id.btnregi);

        db=new DBmain(this);

        ebutton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String user = eusername.getText().toString().trim();
                String email = eemail.getText().toString().trim();
                String pass = epassword.getText().toString().trim();
                String repass = erepassword.getText().toString().trim();

                //email validation
                if (!Patterns.EMAIL_ADDRESS.matcher(email).matches()) {
                    eemail.setError("enter valid email");
                    return;
                }
                //username validation
                else if (eusername.getText().toString().length() <= 2) {
                    //if username less then 2 characters then generate error
                    eusername.setError("Please set valid username");
                }
                //password validation
                else if (epassword.getText().toString().length() <= 0) {
                    epassword.setError("Please enter password");
                }
                //check password length
                else if (epassword.getText().toString().length() <= 6) {
                    epassword.setError("Too short password\n should 6 characters or more");
                }
                //repassword or confirm password
                else if (erepassword.getText().toString().length() <= 6) {
                    erepassword.setError("Please enter confirm password");
                }
                //if remain empty field
                else if (eusername.equals("") || eemail.equals("") || epassword.equals("") || erepassword.equals("")) {
                    Toast.makeText(SignUpForm.this, "Empty field not allow", Toast.LENGTH_SHORT).show();
                }else {
                    //match password
                    if (pass.equals(repass)){
                        Boolean checkuser=checkusername(user,email);
                        if (checkuser==false){
                            Boolean insert=insertData(user,email,pass);
                            if (insert==true){
                                Toast.makeText(SignUpForm.this,user+ "Registration successfully", Toast.LENGTH_SHORT).show();
                                startActivity(new Intent(getApplicationContext(),LoginForm.class));
                                //after click on button clear data
                                eusername.setText("");
                                eemail.setText("");
                                epassword.setText("");
                                erepassword.setText("");
                            }else {
                                Toast.makeText(SignUpForm.this, "Registration failed", Toast.LENGTH_SHORT).show();
                                epassword.setText("");
                                erepassword.setText("");
                            }
                        }else {
                            Toast.makeText(SignUpForm.this, "Username already exist\n click to login", Toast.LENGTH_SHORT).show();
                            //clear password filed
                            epassword.setText("");
                            erepassword.setText("");
                        }
                    }else {
                        Toast.makeText(SignUpForm.this, "Password Not Match", Toast.LENGTH_SHORT).show();
                    }
                }
            }

        });
    }

    private Boolean insertData(String user, String email, String pass) {
        sq=db.getWritableDatabase();
        ContentValues cv=new ContentValues();
        cv.put("username",user);
        cv.put("email",email);
        cv.put("password",pass);
        long rec=sq.insert("course",null,cv);
        if (rec==-1){
            return false;
        }else {
            return true;
        }
    }

    private Boolean checkusername(String user, String email) {
        sq=db.getWritableDatabase();
        Cursor cursor=sq.rawQuery("select *from course where username=? or email=?",new String[]{user,email});
        if (cursor.getCount()>0){
            return true;
        }else{
            return false;
        }
    }

    public void Login(View view) {
        Intent intent=new Intent(SignUpForm.this,LoginForm.class);
        startActivity(intent);
    }
}

Now we will create a user interface.

activity_sign_up_form.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"
    android:gravity="center_vertical"
    android:orientation="vertical"
    android:background="@drawable/homebg"
    tools:context=".SignUpForm">

    <LinearLayout
        android:background="@drawable/bgcolor"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:orientation="vertical">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/mrl"
            android:layout_marginTop="@dimen/mt"
            android:layout_marginRight="@dimen/mrl"
            android:background="@drawable/headerbg"
            android:gravity="center"
            android:padding="25dp"
            android:text="Registration Form"
            android:textColor="@color/white"
            android:textSize="25dp" />

        <com.google.android.material.textfield.TextInputLayout
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
            android:layout_width="wrap_content"
            app:startIconDrawable="@drawable/ic_baseline_account_circle_24"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/mrl"
            android:layout_marginTop="@dimen/mt"
            android:background="@color/white"
            android:layout_marginRight="@dimen/mrl"
            android:hint="Enter username"
            app:endIconMode="clear_text"
            app:endIconTint="#F44336">

            <com.google.android.material.textfield.TextInputEditText
                android:id="@+id/username"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:ems="25" />
        </com.google.android.material.textfield.TextInputLayout>

        <com.google.android.material.textfield.TextInputLayout
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
            android:layout_width="wrap_content"
            android:background="@color/white"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/mrl"
            android:layout_marginTop="@dimen/mt"
            android:layout_marginRight="@dimen/mrl"
            android:hint="Enter Email"
            app:startIconDrawable="@drawable/ic_baseline_email_24"
            app:endIconMode="clear_text"
            app:endIconTint="#F44336">

            <com.google.android.material.textfield.TextInputEditText
                android:id="@+id/useremail"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:ems="25" />
        </com.google.android.material.textfield.TextInputLayout>

        <com.google.android.material.textfield.TextInputLayout
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
            android:layout_width="wrap_content"
            android:background="@color/white"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/mrl"
            android:layout_marginTop="@dimen/mt"
            app:startIconDrawable="@drawable/ic_baseline_vpn_key_24"
            android:layout_marginRight="@dimen/mrl"
            android:hint="Enter password"
            app:endIconMode="clear_text"
            app:endIconTint="#F44336">

            <com.google.android.material.textfield.TextInputEditText
                android:id="@+id/password"
                android:layout_width="match_parent"
                android:inputType="textPassword"
                android:layout_height="match_parent"
                android:ems="25" />
        </com.google.android.material.textfield.TextInputLayout>

        <com.google.android.material.textfield.TextInputLayout
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
            android:layout_width="wrap_content"
            android:background="@color/white"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/mrl"
            android:layout_marginTop="@dimen/mt"
            app:startIconDrawable="@drawable/ic_baseline_vpn_key_24"
            android:layout_marginRight="@dimen/mrl"
            android:hint="Confirm password"
            app:endIconMode="clear_text"
            app:endIconTint="#F44336">

            <com.google.android.material.textfield.TextInputEditText
                android:id="@+id/confirm_pass"
                android:inputType="textPassword"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:ems="25" />
        </com.google.android.material.textfield.TextInputLayout>

        <Button
            android:id="@+id/btnregi"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/mrl"
            android:layout_marginTop="@dimen/mt"
            android:layout_marginRight="@dimen/mrl"
            android:background="@drawable/btncorner"
            android:text="Registration" />

        <TextView
            android:onClick="Login"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Already Account"
            android:textColor="@color/purple_700"
            android:textSize="20dp"
            android:layout_gravity="end"
            android:layout_marginRight="@dimen/mrl"
            android:layout_marginBottom="10dp"/>

    </LinearLayout>

</LinearLayout>

Now create a new empty activity named...

LoginForm.java

package com.pd.loginsqlite;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Patterns;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.google.android.material.textfield.TextInputEditText;

public class LoginForm extends AppCompatActivity {
TextInputEditText eloginuser,eloginpass;
Button ebutton;
DBmain db;
SQLiteDatabase sq;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login_form);

        eloginuser=(TextInputEditText)findViewById(R.id.loginuser);
        eloginpass=(TextInputEditText)findViewById(R.id.loginpass);
        ebutton=(Button)findViewById(R.id.loginbtn);
        db=new DBmain(this);

        //when click on login button
        ebutton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String loginuser=eloginuser.getText().toString().trim();
                String loginpass=eloginpass.getText().toString().trim();

                //check empty field
                if (eloginuser.equals("")||eloginpass.equals("")){
                    Toast.makeText(LoginForm.this, "Empty field not allow", Toast.LENGTH_SHORT).show();
                }
                //check email id
                else if (!Patterns.EMAIL_ADDRESS.matcher(loginuser).matches()){
                    eloginuser.setError("Enter valid email id");
                }else {
                    Boolean checkusername=checkusernamepass(loginuser,loginpass);
                    if (checkusername==true){
                        Toast.makeText(LoginForm.this, "Login successfully", Toast.LENGTH_SHORT).show();
                    //when login successfully redirect welcome activity
                        Intent intent=new Intent(LoginForm.this,Welcome.class);
                        startActivity(intent);
                        eloginuser.setText("");
                        eloginpass.setText("");
                    }else {
                        Toast.makeText(LoginForm.this, "user name and password wrong", Toast.LENGTH_SHORT).show();
                    }
                }
            }
        });
    }

    private Boolean checkusernamepass(String loginuser, String loginpass) {
        sq=db.getWritableDatabase();
        Cursor cursor=sq.rawQuery("select *from course where email=? and password=?",new String[]{loginuser,loginpass});
        if (cursor.getCount()>0){
            return true;
        }else{
            return false;
        }
    }

    public void SignUp(View view) {
        Intent intent=new Intent(LoginForm.this,SignUpForm.class);
        startActivity(intent);
    }
}

Now create layout design in XML file

activity_login_form.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"
    android:background="@drawable/loginbg"
    android:gravity="center_vertical"
    android:orientation="vertical"
    tools:context=".LoginForm">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:layout_marginTop="@dimen/mt"
        android:background="@drawable/bgcolor"
        android:orientation="vertical">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/mrl"
            android:layout_marginTop="@dimen/mt"
            android:layout_marginRight="@dimen/mrl"
            android:background="@drawable/headerbg"
            android:gravity="center"
            android:padding="20dp"
            android:text="Login Form"
            android:textColor="@color/white"
            android:textSize="25dp" />

        <com.google.android.material.textfield.TextInputLayout
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/mrl"
            android:layout_marginTop="@dimen/mt"
            android:layout_marginRight="@dimen/mrl"
            android:background="@color/white"
            android:hint="Email"
            app:startIconDrawable="@drawable/ic_baseline_email_24">

            <com.google.android.material.textfield.TextInputEditText
                android:id="@+id/loginuser"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:ems="25" />
        </com.google.android.material.textfield.TextInputLayout>

        <com.google.android.material.textfield.TextInputLayout
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/mrl"
            android:layout_marginTop="@dimen/mt"
            android:layout_marginRight="@dimen/mrl"
            android:background="@color/white"
            android:hint="Password"
            app:endIconMode="password_toggle"
            app:startIconDrawable="@drawable/ic_baseline_vpn_key_24">
            <com.google.android.material.textfield.TextInputEditText
                android:id="@+id/loginpass"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:ems="25" />
        </com.google.android.material.textfield.TextInputLayout>

        <Button
            android:id="@+id/loginbtn"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/mrl"
            android:layout_marginTop="@dimen/mt"
            android:layout_marginRight="@dimen/mrl"
            android:background="@drawable/btncorner"
            android:text="Login" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="end"
            android:layout_marginTop="@dimen/mt"
            android:layout_marginRight="@dimen/mrl"
            android:onClick="SignUp"
            android:layout_marginBottom="10dp"
            android:text="New User Sign Up"
            android:textColor="@color/purple_700"
            android:textSize="18dp" />
    </LinearLayout>
</LinearLayout>

After login successfully user will be redirected to the welcome page so we will create a new empty activity file.

Welcome.java

package com.pd.loginsqlite;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class Welcome extends AppCompatActivity {

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

In XML layout we will show any text message.

activity_welcome.java

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".Welcome">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Welcome to Course code"
        android:textSize="20dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

we will create a resource XML file for This configuration size.

dimens.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="mrl">30dp</dimen>
    <dimen name="mt">5dp</dimen>
</resources>

AndroidManifest.xml

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

    <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/Theme.LoginSqlite">
        <activity android:name=".Welcome"></activity>
        <activity android:name=".SignUpForm" />
        <activity android:name=".LoginForm" />
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

watch live demo 

https://youtu.be/W-rImcDkgjQ 

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