In this tutorials, we are going to see how to create a simple Android Login Form using Android Studio.

Android Login Form:

Technologies:

• Android SDK Version 27
• Android AppCompact-v7:27.0.1
• Gradle
• Android Studio 3.1

Android Login Example:

Creating a simple Android login screen under Linear Layout.

Project Structure:

Gradle Dependencies:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.onlinetutorialspoint.official.simplelogin"
        minSdkVersion 23
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.0.1'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}

activity_main.xml

Creating a basic login form layout using LinearLayout having one text box, password and Login button.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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="com.onlinetutorialspoint.official.simplelogin.MainActivity">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:layout_marginLeft="16dp"
    android:layout_marginRight="16dp"

    android:layout_centerInParent="true">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="UserName"
        android:id="@+id/username"/>
<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="password"
    android:id="@+id/password"
    android:inputType="textPassword"
    />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Login"
        android:background="#3f76ff"
        android:textColor="#fff"
        android:id="@+id/login"/>
    
</LinearLayout>

</RelativeLayout>

MainActivity.java

Creating MainActivity.java, responsible to read the input from the about layout and validate the user inputs.

package com.onlinetutorialspoint.official.simplelogin;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.util.Objects;

public class MainActivity extends AppCompatActivity {
EditText username,password;
Button login;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        username=findViewById(R.id.username);
        password=findViewById(R.id.password);
        login=findViewById(R.id.login);
        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(Objects.equals(username.getText().toString(), "admin")&&Objects.equals(password.getText().toString(),"admin"))
                {
                    Toast.makeText(MainActivity.this,"You have Authenticated Successfully",Toast.LENGTH_LONG).show();

                }else
                {
                    Toast.makeText(MainActivity.this,"Authentication Failed",Toast.LENGTH_LONG).show();
                }

            }
        });

    }
}

Run Application:

Run Android Virtual Device (AVD):

Giving Valid Credentials: admin – admin

Giving invalid credentials:

Happy Learning 🙂