Class5 your first project modified dimens and string

activity main

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:background="@color/colorBack"
    tools:context="com.example.android.helloandroid.MainActivity"
    tools:ignore="ExtraText"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="match_parent"
        android:layout_height="0sp"
        android:layout_weight="1" />

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="0sp"
        android:layout_weight="3"
        android:scaleType="centerCrop"
        android:src="@drawable/keep" />

    <!-- Title at 20dp as suggested in MaterialDesign -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/margentop"
        android:fontFamily="sans-serif-condensed"
        android:paddingStart="@dimen/padleft"
        android:text="@string/udacity"
        android:textColor="@color/colorStext"
        android:textSize="@dimen/title"
        android:textStyle="bold" />

    <!-- Body at 14dp -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="8sp"
        android:fontFamily="sans-serif-condensed"
        android:paddingStart="@dimen/padleft"
        android:text="@string/adresse"
        android:textColor="@color/colorText"
        android:textSize="@dimen/body" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="8sp"
        android:fontFamily="sans-serif-condensed"
        android:paddingStart="@dimen/padleft"
        android:text="@string/tlf"
        android:textColor="@color/colorText"
        android:textSize="@dimen/body" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="8sp"
        android:layout_weight="1"
        android:fontFamily="sans-serif-condensed"
        android:paddingStart="@dimen/padleft"
        android:text="@string/web"
        android:textColor="@color/colorLink"
        android:textSize="@dimen/body"
        android:textStyle="bold"/>


</LinearLayout>

colour

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorBack">#2b2b2b</color>
    <color name="colorText">#cfb17c</color>
    <color name="colorStext">#f0eabd</color>
    <color name="colorLink">#415f78</color>
</resources>

dimens

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="title">20sp</dimen>
    <dimen name="body">14sp</dimen>
    <dimen name="extra">16sp</dimen>
    <dimen name="margentop">16sp</dimen>
    <dimen name="padleft">16sp</dimen>
</resources>

strings

<resources>
    <string name="app_name">HelloAndroid</string>
    <string name="udacity">Udacity</string>
    <string name="adresse">2465 Latham St, Mountain View, CA 94043</string>
    <string name="tlf">650-555-5555</string>
    <string name="web">www.udacity.com</string>
</resources>