The simplest we can go is to build a simple keypad in the shape of a cross on the left-hand side of the screen and a fire button on its right-hand side. For this layout, we are going to create a new file under the layout folder and call it view_keypad.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_gravity="bottom"
android:padding="@dimen/keypad_size"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/keypad_up"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/keypad_left"
android:layout_width="@dimen/keypad_size"
android:layout_height="@dimen/keypad_size" />
<Button
android:id="@+id/keypad_down"
android:layout_below="@+id/keypad_left"
android:layout_toRightOf="@+id/keypad_left"
android:layout_width="@dimen/keypad_size"
android:layout_height...