Stopwatch layout

activity_main.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=".MainActivity">

    <FrameLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:background="@drawable/background"
        android:clickable="false">

        <RelativeLayout
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_gravity="left|top">

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentTop="true"
                android:layout_alignParentLeft="true">

                <TextView
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:text="00:00.0"
                    android:gravity="center"
                    android:id="@+id/timerTextView"
                    android:layout_alignParentTop="true"
                    android:layout_alignLeft="@+id/startStopButton"
                    android:layout_marginTop="18dp"
                    android:textSize="60sp" />

            </LinearLayout>

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="90dp"
                android:layout_alignParentBottom="true"
                android:layout_alignParentLeft="true"
                android:layout_margin="10dp">

                <Button
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Start"
                    android:id="@+id/startStopButton"
                    android:onClick="startStopClick"
                    android:layout_alignTop="@+id/resetButton"
                    android:layout_alignParentLeft="true"
                    android:layout_weight="1"
                    android:textSize="30sp"
                    android:background="@drawable/startbutton" />

                <Button
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Reset"
                    android:id="@+id/resetButton"
                    android:onClick="resetClick"
                    android:layout_alignParentBottom="true"
                    android:layout_toRightOf="@+id/startStopButton"
                    android:layout_weight="1"
                    android:textSize="30sp"
                    android:background="@drawable/resetbutton" />

            </LinearLayout>
        </RelativeLayout>
    </FrameLayout>
</RelativeLayout>