activity_camera_viewer.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".CameraViewerActivity" >

    <Button
        android:id="@+id/takePictureButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onClickTakePicture"
        android:text="@string/takePicture"

     />

    <Button
        android:id="@+id/savePictureButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:onClick="onClickSavePicture"
        android:text="@string/savePicture" />

    <Button
        android:id="@+id/uploadPictureButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:onClick="onClickUploadPicture"
        android:text="@string/uploadPicture" />

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_alignParentBottom="true"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/takePictureButton" />

</RelativeLayout>