res/layout/activity_ara_plox.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout android:id="@+id/chart"
                  android:orientation="horizontal"
                  android:layout_width="fill_parent"
                  android:layout_height="0dip"
                  android:layout_weight="2"/>

    <TextView
        android:id="@+id/textView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_weight="1"
        android:background="#FFFFFF"
        android:fontFamily="sans-serif"
        android:textSize="64sp"
        android:text="@string/hello_world" />

</LinearLayout>