use a material design

allows resetting the emulator

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

@@ -1,21 +1,58 @@
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<android.support.design.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"
-    android:keepScreenOn="true"
-    android:orientation="vertical"
-    tools:context="com.vsmartcard.remotesmartcardreader.app.MainActivity">
+    android:fitsSystemWindows="true"
+    tools:context="com.vsmartcard.smartcardemulator.MainActivity">
 
-    <ScrollView
+    <android.support.design.widget.AppBarLayout
+        android:id="@+id/app_bar"
         android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:id="@+id/scrollView">
-        <TextView
+        android:layout_height="@dimen/app_bar_height"
+        android:fitsSystemWindows="true"
+        android:theme="@style/AppTheme.AppBarOverlay">
+
+        <android.support.design.widget.CollapsingToolbarLayout
+            android:id="@+id/toolbar_layout"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
-            android:textAppearance="?android:attr/textAppearanceSmall"
-            android:id="@+id/textViewLog"
-            android:typeface="monospace" />
-    </ScrollView>
+            android:fitsSystemWindows="true"
+            app:contentScrim="?attr/colorPrimary"
+            app:layout_scrollFlags="scroll|exitUntilCollapsed">
 
-</LinearLayout>
+            <android.support.v7.widget.Toolbar
+                android:id="@+id/toolbar"
+                android:layout_width="match_parent"
+                android:layout_height="?attr/actionBarSize"
+                app:layout_collapseMode="pin"
+                app:popupTheme="@style/AppTheme.PopupOverlay" />
+
+        </android.support.design.widget.CollapsingToolbarLayout>
+    </android.support.design.widget.AppBarLayout>
+
+    <android.support.v4.widget.NestedScrollView 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="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_behavior="@string/appbar_scrolling_view_behavior"
+        tools:context="com.vsmartcard.remotesmartcardreader.app.MainActivity"
+        tools:showIn="@layout/activity_main">
+        <TextView
+            android:layout_margin="@dimen/text_margin"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:id="@+id/textViewLog" />
+    </android.support.v4.widget.NestedScrollView>
+
+    <android.support.design.widget.FloatingActionButton
+        android:id="@+id/fab"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_margin="@dimen/fab_margin"
+        android:src="@mipmap/ic_reset"
+        app:layout_anchor="@id/app_bar"
+        app:layout_anchorGravity="bottom|end" />
+
+</android.support.design.widget.CoordinatorLayout>

ACardEmulator/app/src/main/res/values/colors.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#3F51B5</color>
+    <color name="colorPrimaryDark">#303F9F</color>
+    <color name="colorAccent">#fdd017</color>
+</resources>

ACardEmulator/app/src/main/res/values/dimens.xml

@@ -1,6 +1,5 @@
 <resources>
-    <!-- Default screen margins, per the Android Design guidelines. -->
-    <dimen name="activity_horizontal_margin">16dp</dimen>
-    <dimen name="activity_vertical_margin">16dp</dimen>
-
-    </resources>
+    <dimen name="app_bar_height">180dp</dimen>
+    <dimen name="fab_margin">16dp</dimen>
+    <dimen name="text_margin">16dp</dimen>
+</resources>

ACardEmulator/app/src/main/res/values/styles.xml

@@ -3,6 +3,18 @@
     <!-- Base application theme. -->
     <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
         <!-- Customize your theme here. -->
+        <item name="colorPrimary">@color/colorPrimary</item>
+        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
+        <item name="colorAccent">@color/colorAccent</item>
     </style>
 
+    <style name="AppTheme.NoActionBar">
+        <item name="windowActionBar">false</item>
+        <item name="windowNoTitle">true</item>
+    </style>
+
+    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
+
+    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
+
 </resources>