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/build.gradle b/app/build.gradle
index 570584c..5f2d47a 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -9,11 +9,11 @@ android {
     buildToolsVersion "29.0.2"
     defaultConfig {
         applicationId "fr.plnech.dunbar"
-        minSdkVersion 15
+        minSdkVersion 21
         targetSdkVersion 28
         versionCode 1
         versionName "1.0"
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
         release {
@@ -26,10 +26,10 @@ android {
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-    implementation 'com.android.support:appcompat-v7:28.0.0'
-    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
-    implementation 'com.android.support:design:28.0.0'
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    implementation 'com.google.android.material:material:1.0.0'
     testImplementation 'junit:junit:4.12'
-    androidTestImplementation 'com.android.support.test:runner:1.0.2'
-    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+    androidTestImplementation 'androidx.test:runner:1.2.0'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
 }
diff --git a/app/src/androidTest/java/fr/plnech/dunbar/ExampleInstrumentedTest.kt b/app/src/androidTest/java/fr/plnech/dunbar/ExampleInstrumentedTest.kt
index 47e1f0b..276446b 100644
--- a/app/src/androidTest/java/fr/plnech/dunbar/ExampleInstrumentedTest.kt
+++ b/app/src/androidTest/java/fr/plnech/dunbar/ExampleInstrumentedTest.kt
@@ -1,7 +1,7 @@
 package fr.plnech.dunbar
 
-import android.support.test.InstrumentationRegistry
-import android.support.test.runner.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
 
 import org.junit.Test
 import org.junit.runner.RunWith
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index a661b03..7392302 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -2,8 +2,12 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="fr.plnech.dunbar">
 
+    <uses-permission android:name="android.permission.READ_CONTACTS" />
+    <uses-permission android:name="android.permission.READ_CALL_LOG" />
+    <uses-permission android:name="android.permission.READ_SMS" />
+
     <application
-        android:allowBackup="true"
+        android:allowBackup="false"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
@@ -20,5 +24,4 @@
             </intent-filter>
         </activity>
     </application>
-
 </manifest>
\ No newline at end of file
diff --git a/app/src/main/java/fr/plnech/dunbar/Extensions.kt b/app/src/main/java/fr/plnech/dunbar/Extensions.kt
new file mode 100644
index 0000000..6e5731b
--- /dev/null
+++ b/app/src/main/java/fr/plnech/dunbar/Extensions.kt
@@ -0,0 +1,8 @@
+package fr.plnech.dunbar
+
+fun String.plural(count: Int = 1): String {
+    return when {
+        count > 1 -> this + "s"
+        else -> this
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/fr/plnech/dunbar/Friends.kt b/app/src/main/java/fr/plnech/dunbar/Friends.kt
index b75046c..c9b26b0 100644
--- a/app/src/main/java/fr/plnech/dunbar/Friends.kt
+++ b/app/src/main/java/fr/plnech/dunbar/Friends.kt
@@ -1,7 +1,5 @@
 package fr.plnech.dunbar
 
+// * @see [contacts doc](https://developer.android.com/training/contacts-provider/retrieve-names)
 class Friends {
-    fun loadFriends() {
-
-    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/fr/plnech/dunbar/MainActivity.kt b/app/src/main/java/fr/plnech/dunbar/MainActivity.kt
index f41dbe5..483ffc0 100644
--- a/app/src/main/java/fr/plnech/dunbar/MainActivity.kt
+++ b/app/src/main/java/fr/plnech/dunbar/MainActivity.kt
@@ -1,24 +1,35 @@
 package fr.plnech.dunbar
 
 import android.os.Bundle
-import android.support.design.widget.Snackbar
-import android.support.v7.app.AppCompatActivity
+import android.provider.ContactsContract
 import android.view.Menu
 import android.view.MenuItem
-
+import android.widget.ArrayAdapter
+import android.widget.Toast
+import androidx.appcompat.app.AppCompatActivity
+import com.google.android.material.snackbar.Snackbar
 import kotlinx.android.synthetic.main.activity_main.*
+import kotlinx.android.synthetic.main.content_main.*
+
 
 class MainActivity : AppCompatActivity() {
 
+    private val CONTENT_VIEW_ID = 10101010
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
         setSupportActionBar(toolbar)
 
+
+
+
         fab.setOnClickListener { view ->
             Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
-                    .setAction("Action", null).show()
+                .setAction("Action", null).show()
         }
+
+        fetchFriends()
     }
 
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
@@ -36,4 +47,40 @@ class MainActivity : AppCompatActivity() {
             else -> super.onOptionsItemSelected(item)
         }
     }
+
+    fun fetchFriends() {
+        contentResolver.query(
+            ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
+            null,
+            null,
+            null,
+            null
+        )?.let {
+
+            val contacts = mutableListOf<List<Pair<String, String>>>()
+            while (it.moveToNext()) {
+                contacts.add(mutableListOf<Pair<String, String>>().also { contact ->
+                    it.columnNames.forEach { name ->
+                        contact.add(Pair(name, it.getString(it.getColumnIndex(name))))
+                    }
+                })
+            }
+
+            friends.adapter =
+                ArrayAdapter<String>(this, R.layout.contact, R.id.name,
+                    contacts.map { contact ->
+                        contact.filter { !it.second.isNullOrBlank() }
+                            .joinToString { "${it.first}:${it.second}" }
+                    })
+
+            val nbFriends = friends.adapter.count
+            welcomeTitle.text = "$nbFriends ${"friend".plural(nbFriends)} on Dunbar"
+
+            Toast.makeText(this@MainActivity, "$nbFriends ", Toast.LENGTH_LONG).show()
+
+            it?.close()
+        }
+
+
+    }
 }
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index eed4d89..e9fa907 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,28 +1,28 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.coordinatorlayout.widget.CoordinatorLayout 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">
 
-    <android.support.design.widget.AppBarLayout
+    <com.google.android.material.appbar.AppBarLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:theme="@style/AppTheme.AppBarOverlay">
 
-        <android.support.v7.widget.Toolbar
+        <androidx.appcompat.widget.Toolbar
             android:id="@+id/toolbar"
             android:layout_width="match_parent"
             android:layout_height="?attr/actionBarSize"
             android:background="?attr/colorPrimary"
             app:popupTheme="@style/AppTheme.PopupOverlay" />
 
-    </android.support.design.widget.AppBarLayout>
+    </com.google.android.material.appbar.AppBarLayout>
 
     <include layout="@layout/content_main" />
 
-    <android.support.design.widget.FloatingActionButton
+    <com.google.android.material.floatingactionbutton.FloatingActionButton
         android:id="@+id/fab"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
@@ -30,4 +30,4 @@
         android:layout_margin="@dimen/fab_margin"
         app:srcCompat="@android:drawable/ic_dialog_email" />
 
-</android.support.design.widget.CoordinatorLayout>
\ No newline at end of file
+</androidx.coordinatorlayout.widget.CoordinatorLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/contact.xml b/app/src/main/res/layout/contact.xml
new file mode 100644
index 0000000..e423727
--- /dev/null
+++ b/app/src/main/res/layout/contact.xml
@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<androidx.cardview.widget.CardView 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"
+    android:elevation="5dp">
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+
+
+        <ImageView
+            android:id="@+id/pic"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_margin="10dp"
+            android:height="150dp"
+            android:src="@android:drawable/"
+            android:elevation="2dp"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintLeft_toLeftOf="parent"
+            app:layout_constraintRight_toLeftOf="@id/name"
+            app:layout_constraintTop_toTopOf="parent"
+            tools:src="@tools:sample/avatars"
+            android:contentDescription="TODO" />
+
+        <TextView
+            android:id="@+id/name"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginLeft="15dp"
+            android:clickable="true"
+            android:focusable="true"
+            android:maxLines="2"
+            android:textAppearance="@style/TextAppearance.AppCompat.Title"
+            android:textSize="32sp"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintLeft_toRightOf="@id/pic"
+            app:layout_constraintRight_toLeftOf="@id/name"
+            app:layout_constraintTop_toTopOf="parent"
+            tools:text="@tools:sample/full_names" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+</androidx.cardview.widget.CardView>
diff --git a/app/src/main/res/layout/contacts.xml b/app/src/main/res/layout/contacts.xml
new file mode 100644
index 0000000..cd4b749
--- /dev/null
+++ b/app/src/main/res/layout/contacts.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ListView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/contact_list_item"
+    tools:listitem="@layout/contact"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent" />
diff --git a/app/src/main/res/layout/content_main.xml b/app/src/main/res/layout/content_main.xml
index 3fc2170..946822d 100644
--- a/app/src/main/res/layout/content_main.xml
+++ b/app/src/main/res/layout/content_main.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<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"
@@ -9,12 +9,27 @@
     tools:showIn="@layout/activity_main">
 
     <TextView
+        android:id="@+id/welcomeTitle"
+        android:layout_marginTop="50dp"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
+        tools:text="N friends on Dunbar"
+        android:textSize="24sp"
+        app:layout_constraintBottom_toTopOf="@id/friends"
         app:layout_constraintLeft_toLeftOf="parent"
         app:layout_constraintRight_toRightOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+    <ListView
+        android:id="@+id/friends"
+        android:layout_width="match_parent"
+        android:padding="10dp"
+        android:layout_height="wrap_content"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/welcomeTitle"
+        tools:listitem="@layout/contact"
+        tools:text="@tools:sample/last_names" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index eccd7a6..e3245e7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,7 +8,7 @@ buildscript {
         
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:3.5.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/gradle.properties b/gradle.properties
index 85be9ea..3d8ce0c 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -13,3 +13,5 @@ org.gradle.jvmargs=-Xmx1536m
 # org.gradle.parallel=true
 # Kotlin code style for this project: "official" or "obsolete":
 kotlin.code.style=official
+android.useAndroidX=true
+android.enableJetifier=true