Fichier MainActivity.java

package com.example.organisation;

import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;

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

Fichier activity_main.xml (dans res/layout/)

<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="20dp">

    <View
        android:id="@+id/blueView"
        android:layout_width="0dp"
        android:layout_height="100dp"
        android:layout_weight="2"
        android:background="#33B5E5"/>

    <View
        android:id="@+id/greenView"
        android:layout_width="0dp"
        android:layout_height="100dp"
        android:layout_weight="1"
        android:background="#99CC00"/>
</LinearLayout>