diff --git a/DEV-4.5/TP06/Desoxyribonucleique/app/src/main/java/com/example/desoxyribonucleique/ObservateurPrefs.java b/DEV-4.5/TP06/Desoxyribonucleique/app/src/main/java/com/example/desoxyribonucleique/ObservateurPrefs.java
new file mode 100644
index 0000000..9fc9a93
--- /dev/null
+++ b/DEV-4.5/TP06/Desoxyribonucleique/app/src/main/java/com/example/desoxyribonucleique/ObservateurPrefs.java
@@ -0,0 +1,2 @@
+package com.example.desoxyribonucleique;public class ObservateurPrefs {
+}
diff --git a/DEV-4.5/TP06/Desoxyribonucleique/app/src/main/java/com/example/desoxyribonucleique/SettingsActivity.java b/DEV-4.5/TP06/Desoxyribonucleique/app/src/main/java/com/example/desoxyribonucleique/SettingsActivity.java
index d6b8e2c..989acc8 100644
--- a/DEV-4.5/TP06/Desoxyribonucleique/app/src/main/java/com/example/desoxyribonucleique/SettingsActivity.java
+++ b/DEV-4.5/TP06/Desoxyribonucleique/app/src/main/java/com/example/desoxyribonucleique/SettingsActivity.java
@@ -1,16 +1,33 @@
 package com.example.desoxyribonucleique;
 
 import android.os.Bundle;
-import android.preference.PreferenceActivity;
-import android.view.Menu;
 
-public class SettingsActivity extends PreferenceActivity {
+import androidx.appcompat.app.ActionBar;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.preference.PreferenceFragmentCompat;
+
+public class SettingsActivity extends AppCompatActivity {
 
     @Override
-    public void onCreate(Bundle savedInstanceState) {
+    protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        this.addPreferencesFromResource(R.xml.preferences);
+        setContentView(R.layout.settings_activity);
+        if (savedInstanceState == null) {
+            getSupportFragmentManager()
+                    .beginTransaction()
+                    .replace(R.id.settings, new SettingsFragment())
+                    .commit();
+        }
+        ActionBar actionBar = getSupportActionBar();
+        if (actionBar != null) {
+            actionBar.setDisplayHomeAsUpEnabled(true);
+        }
     }
 
-    
-}
+    public static class SettingsFragment extends PreferenceFragmentCompat {
+        @Override
+        public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
+            setPreferencesFromResource(R.xml.root_preferences, rootKey);
+        }
+    }
+}
\ No newline at end of file
diff --git a/DEV-4.5/TP06/Desoxyribonucleique/app/src/main/res/layout/settings_activity.xml b/DEV-4.5/TP06/Desoxyribonucleique/app/src/main/res/layout/settings_activity.xml
new file mode 100644
index 0000000..de6591a
--- /dev/null
+++ b/DEV-4.5/TP06/Desoxyribonucleique/app/src/main/res/layout/settings_activity.xml
@@ -0,0 +1,9 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <FrameLayout
+        android:id="@+id/settings"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+</LinearLayout>
\ No newline at end of file
diff --git a/DEV-4.5/TP06/Desoxyribonucleique/app/src/main/res/values/arrays.xml b/DEV-4.5/TP06/Desoxyribonucleique/app/src/main/res/values/arrays.xml
new file mode 100644
index 0000000..6cf9ed4
--- /dev/null
+++ b/DEV-4.5/TP06/Desoxyribonucleique/app/src/main/res/values/arrays.xml
@@ -0,0 +1,12 @@
+<resources>
+    <!-- Reply Preference -->
+    <string-array name="reply_entries">
+        <item>Reply</item>
+        <item>Reply to all</item>
+    </string-array>
+
+    <string-array name="reply_values">
+        <item>reply</item>
+        <item>reply_all</item>
+    </string-array>
+</resources>
\ No newline at end of file
diff --git a/DEV-4.5/TP06/Desoxyribonucleique/app/src/main/res/xml/root_preferences.xml b/DEV-4.5/TP06/Desoxyribonucleique/app/src/main/res/xml/root_preferences.xml
new file mode 100644
index 0000000..67158db
--- /dev/null
+++ b/DEV-4.5/TP06/Desoxyribonucleique/app/src/main/res/xml/root_preferences.xml
@@ -0,0 +1,35 @@
+<PreferenceScreen xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <PreferenceCategory app:title="@string/messages_header">
+
+        <EditTextPreference
+            app:key="signature"
+            app:title="@string/signature_title"
+            app:useSimpleSummaryProvider="true" />
+
+        <ListPreference
+            app:defaultValue="reply"
+            app:entries="@array/reply_entries"
+            app:entryValues="@array/reply_values"
+            app:key="reply"
+            app:title="@string/reply_title"
+            app:useSimpleSummaryProvider="true" />
+
+    </PreferenceCategory>
+
+    <PreferenceCategory app:title="@string/sync_header">
+
+        <SwitchPreferenceCompat
+            app:key="sync"
+            app:title="@string/sync_title" />
+
+        <SwitchPreferenceCompat
+            app:dependency="sync"
+            app:key="attachment"
+            app:summaryOff="@string/attachment_summary_off"
+            app:summaryOn="@string/attachment_summary_on"
+            app:title="@string/attachment_title" />
+
+    </PreferenceCategory>
+
+</PreferenceScreen>
\ No newline at end of file