Practical – 28

Q1) WAP to create the login form with necessary validation like length of username and
password, empty text fields, count of unsuccessful login attempts. Display the login
successful / unsuccessful toast message.
XML CODE:

<?xml version="1.0" encoding="utf-8"?> app:layout_constraintBottom_toTopOf="@+id/E1"

<androidx.constraintlayout.widget.ConstraintLayout app:layout_constraintStart_toStartOf="@+id/E1"
xmlns:android="http://schemas.android.com/apk/res/an app:layout_constraintTop_toBottomOf="@+id/t1"
droid" />
xmlns:app="http://schemas.android.com/apk/res-
auto" <EditText
xmlns:tools="http://schemas.android.com/tools" android:id="@+id/E1"
android:layout_width="match_parent" android:layout_width="wrap_content"
android:layout_height="match_parent" android:layout_height="wrap_content"
android:padding="20dp" android:layout_marginBottom="44dp"
tools:context=".MainActivity"> android:ems="10"
android:hint="Username"
<ImageView android:inputType="text"
android:id="@+id/imageView" app:layout_constraintBottom_toTopOf="@+id/t3"
android:layout_width="217dp" app:layout_constraintEnd_toEndOf="parent"
android:layout_height="133dp" app:layout_constraintStart_toStartOf="parent"
android:layout_gravity="center_horizontal" app:layout_constraintTop_toBottomOf="@+id/t2"
android:layout_marginStart="80dp" />
android:layout_marginTop="36dp"
android:layout_marginBottom="36dp" <TextView
app:layout_constraintBottom_toTopOf="@+id/t1" android:id="@+id/t3"
app:layout_constraintStart_toStartOf="parent" android:layout_width="wrap_content"
app:layout_constraintTop_toTopOf="parent" android:layout_height="wrap_content"
android:layout_marginStart="1dp"
app:srcCompat="@drawable/undraw_secure_login_pdn android:layout_marginBottom="8dp"
4" /> android:text="Enter Password"
app:layout_constraintBottom_toTopOf="@+id/E2"
<TextView app:layout_constraintStart_toStartOf="@+id/E2"
android:id="@+id/t1" app:layout_constraintTop_toBottomOf="@+id/E1"
android:layout_width="wrap_content" />
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal" <EditText
android:layout_marginStart="68dp" android:id="@+id/E2"
android:layout_marginBottom="55dp" android:layout_width="wrap_content"
android:text="Login" android:layout_height="wrap_content"
android:textSize="30dp" android:layout_marginBottom="60dp"
android:textStyle="bold" android:ems="10"
app:layout_constraintBottom_toTopOf="@+id/t2" android:hint="Password"
android:inputType="textPassword"
app:layout_constraintStart_toStartOf="@+id/imageView
" app:layout_constraintBottom_toTopOf="@+id/button"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imageVie app:layout_constraintStart_toStartOf="parent"
w" /> app:layout_constraintTop_toBottomOf="@+id/t3"
/>
<TextView
android:id="@+id/t2" <Button
android:layout_width="wrap_content" android:id="@+id/button"
android:layout_height="wrap_content" android:layout_width="wrap_content"
android:layout_marginStart="2dp" android:layout_height="wrap_content"
android:layout_marginBottom="9dp" android:layout_marginBottom="163dp"
android:text="Enter Username" android:text="LOGIN"
 android:textStyle="bold" app:layout_constraintTop_toBottomOf="@+id/E2"
app:layout_constraintBottom_toBottomOf="parent" />
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" </androidx.constraintlayout.widget.ConstraintLayout>

JAVA CODE:
package com.example.prac28;
import androidx.appcompat.app.AppCompatActivity;
import android.annotation.SuppressLint;
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 {

private EditText uET, pET;
private Button b1;
private int loginAttempts = 0;

@SuppressLint("MissingInflatedId")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
uET = findViewById(R.id.E1);
pET = findViewById(R.id.E2);
b1 = findViewById(R.id.button);

b1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String username = uET.getText().toString();
String password = pET.getText().toString();

if(username.isEmpty()||password.isEmpty()){
Toast.makeText(MainActivity.this,"Fields can't be Empty !!",Toast.LENGTH_SHORT).show();
} else if (username.equals("Nisha")&&password.equals("nisha234")){
Toast.makeText(MainActivity.this,"Login Successful !!",Toast.LENGTH_SHORT).show();
}else{
loginAttempts++;
if(loginAttempts >= 3){
b1.setEnabled(false);
Toast.makeText(MainActivity.this,"Too many Login Attempts",Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(MainActivity.this,"Incorrect Username or Password",Toast.LENGTH_SHORT).show();
}
}
}
});
}
}