call_activity_layout.xml

<?xml version="1.0" encoding="utf-8"?>
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Author: Adrien Beraud <adrien.beraud@gmail.com>                     
                                                                    
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<LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"
    android:id="@+id/CallActivityLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical">
    <Button
        android:id="@+id/buttonanswer"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:text="Answer Up"/>
    <Button
        android:id="@+id/buttonhangup"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:text="Hang Up"/>
    <Button
        android:id="@+id/buttonhold"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:text="Hold"/>
    <Button
        android:id="@+id/buttonunhold"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:text="Unhold"/>
    <TextView
        android:id="@+id/callstate"
        android:layout_width="match_parent" 
        android:layout_height="match_parent"
        android:gravity="center_vertical|center_horizontal"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Call State"/>
</LinearLayout>