Android Studio :

                                                    
                                                        
<?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=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Bienvenue sur l'application SicilyLines"
        android:textSize="20sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.493"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.144"
        tools:ignore="HardcodedText" />

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="130dp"
        android:layout_height="116dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.26"
        app:srcCompat="@drawable/ic_action_name"
        tools:ignore="ContentDescription" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Connectez-vous pour acceder a l'espace client, \n ou creez un compte :"
        android:textAlignment="center"
        android:textSize="15sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.494"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.45"
        tools:ignore="HardcodedText" />

    <Button
        android:id="@+id/btnConnect"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/se_connecter"
        android:onClick="bConnect"
        app:backgroundTint="#2661bf"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.686" />

    <Button
        android:id="@+id/btnRegister"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/creer_un_compte"
        android:onClick="bRegister"
        app:backgroundTint="#2661bf"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.565" />

</androidx.constraintlayout.widget.ConstraintLayout>
                                                        
                                                    
                                                

                                                    
                                                        
package com.example.sicilylines;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity
{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void bRegister(View view) {
        Intent intentEnvoyer = new Intent(this, CreerCompteActivity.class);
        startActivity(intentEnvoyer);
    }

    public void bConnect(View view) {
        Intent intentEnvoyer = new Intent(this, ConnexionActivity.class);
        startActivity(intentEnvoyer);
    }
}