Amélioration et prep question d'après.

app/src/main/res/layout/activity_main.xml

@@ -6,27 +6,48 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:id="@+id/firstLayout"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toTopOf="@+id/secondLayout"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent">
+
+        <Button
+            android:id="@+id/button"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="Entrer"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toEndOf="@+id/textInput"
+            app:layout_constraintTop_toTopOf="parent" />
+
         <EditText
             android:id="@+id/textInput"
             android:layout_width="0dp"
             android:layout_height="60dp"
             android:ems="10"
+            android:hint="Tapez une question"
             android:inputType="textPersonName"
             android:text="Name"
-        app:layout_constraintBottom_toTopOf="@+id/button"
-        app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toStartOf="@+id/button"
             app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent"
-        android:hint="Tapez une question" />
+            app:layout_constraintTop_toTopOf="parent" />
+    </androidx.constraintlayout.widget.ConstraintLayout>
 
-    <Button
-        android:id="@+id/button"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Button"
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:id="@+id/secondLayout"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:layout_constraintTop_toBottomOf="@+id/firstLayout"
         app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/textInput" />
+        app:layout_constraintEnd_toEndOf="parent">
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
 
 </androidx.constraintlayout.widget.ConstraintLayout>
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