diff --git a/.idea/misc.xml b/.idea/misc.xml
index cca2cda..7158618 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -37,7 +37,7 @@
     <ConfirmationsSetting value="0" id="Add" />
     <ConfirmationsSetting value="0" id="Remove" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" assert-keyword="true" jdk-15="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" default="true" assert-keyword="true" jdk-15="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/app/src/main/java/com/example/diceroller/DiceActivity.java b/app/src/main/java/com/example/diceroller/DiceActivity.java
new file mode 100644
index 0000000..6eadd4f
--- /dev/null
+++ b/app/src/main/java/com/example/diceroller/DiceActivity.java
@@ -0,0 +1,10 @@
+package com.example.diceroller;
+
+import android.app.Activity;
+
+/**
+ * Created by thibaud on 20/04/17.
+ */
+
+public class DiceActivity extends Activity {
+}
diff --git a/app/src/main/res/layout/activity_dice.xml b/app/src/main/res/layout/activity_dice.xml
new file mode 100644
index 0000000..0c7436d
--- /dev/null
+++ b/app/src/main/res/layout/activity_dice.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical" android:layout_width="match_parent"
+    android:layout_height="match_parent">
+    <TextView
+        android:id="@+id/textTitle"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_horizontal"
+        android:text="@string/x_sided_dice"
+        android:textSize="30sp"/>
+
+    <TextView
+        android:id="@+id/textResult"
+        android:layout_width="wrap_content"
+        android:layout_height="0dp"
+        android:layout_weight="1"
+        android:layout_gravity="center"
+        android:gravity="center"
+        android:text="@string/x"
+        android:textSize="250sp"/>
+
+    <Button
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/roll_dice"
+        android:textSize="25sp"
+        android:layout_gravity="center"/>
+
+</LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index e3de2db..db8cbd7 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,18 +1,47 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.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="com.example.diceroller.MainActivity">
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical" android:layout_width="match_parent"
+    android:layout_height="match_parent">
+    <Space
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1" />
 
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+    <!-- On place les Button dans des FrameLayout afin de pouvoir
+    définir leur taille verticale -->
+    <FrameLayout
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1">
+        <Button
+            android:id="@+id/button6"
+            android:layout_width="fill_parent"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center"
+            android:padding="20dp"
+            android:layout_margin="20dp"
+            android:text="@string/_6_sided_dice"
+            android:textSize="18sp"/>
+    </FrameLayout>
 
-</android.support.constraint.ConstraintLayout>
+    <FrameLayout
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1">
+        <Button
+            android:id="@+id/button20"
+            android:layout_width="fill_parent"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center"
+            android:padding="20dp"
+            android:layout_margin="20dp"
+            android:text="@string/_20_sided_dice"
+            android:textSize="18sp"/>
+    </FrameLayout>
+
+    <Space
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1" />
+
+</LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index cae5db0..f052cf0 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,8 @@
 <resources>
     <string name="app_name">DiceRoller</string>
+    <string name="_6_sided_dice">6-sided dice</string>
+    <string name="_20_sided_dice">20-sided dice</string>
+    <string name="x_sided_dice">X sided dice</string>
+    <string name="x">X</string>
+    <string name="roll_dice">Roll dice !</string>
 </resources>