Android Development Login Form Code For Java and XML

Java Code (LoginActivity.java)

Create a new Java class (e.g., LoginActivity.java) and add the following code to handle the login logic:

// LoginActivity.java

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class LoginActivity extends AppCompatActivity {

    private EditText editTextUsername, editTextPassword;

    private Button buttonLogin;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_login);

        // Initialize views

        editTextUsername = findViewById(R.id.editTextUsername);

        editTextPassword = findViewById(R.id.editTextPassword);

        buttonLogin = findViewById(R.id.buttonLogin);

        // Set click listener for login button

        buttonLogin.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                // Retrieve input values

                String username = editTextUsername.getText().toString().trim();

                String password = editTextPassword.getText().toString().trim();

                // Check if username and password are correct

                if (username.equals("your_username") && password.equals("your_password")) {

                    // Successful login

                    Toast.makeText(LoginActivity.this, "Login Successful", Toast.LENGTH_SHORT).show();

                    // Add your code to proceed to the next activity or perform other actions

                } else {

                    // Invalid login

                    Toast.makeText(LoginActivity.this, "Invalid username or password", Toast.LENGTH_SHORT).show();

                }

            }

        });

    }

}

Layout XML (activity_login.xml)

Create a new XML file in your res/layout directory called activity_login.xml:

<!-- activity_login.xml -->

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    android:padding="16dp">

    <EditText

        android:id="@+id/editTextUsername"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:hint="Username"

        android:inputType="text"/>

    <EditText

        android:id="@+id/editTextPassword"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:hint="Password"

        android:inputType="textPassword"/>

    <Button

        android:id="@+id/buttonLogin"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="Login"/>

</LinearLayout>

Explanation: 

• Layout XML (activity_login.xml):  
• Defines a simple login form with two EditText fields for username and password, and a Button for login. 

• Java Code (LoginActivity.java):
•   Sets up the LoginActivity class which extends AppCompatActivity. 
• Retrieves references to the EditText fields and Button from the layout XML. 
• Sets an OnClickListener on the login button to handle login attempts. 
• Checks if the entered username and password match hardcoded values ("your_username" and "your_password" in this example). 
• Displays a toast message indicating success or failure of the login attempt. 

Notes: 

• Security: Hardcoding usernames and passwords directly in code is insecure. In a real application, you would use secure storage methods like encryption or authentication services. 
• Error Handling: This example does minimal error handling (e.g., empty fields), which should be expanded upon in a real application.