Try with this :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:id="@+id/linearLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
</LinearLayout>
<TableLayout
android:id="@+id/tableLayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@+id/linearLayout"
android:layout_margin="10dp"
android:weightSum="2" >
<TableRow
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:minHeight="100dp" >
<RelativeLayout
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight=".5" >
<Button
android:id="@+id/searchBtn"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#cccccc"
android:minHeight="100dp"
android:text="Search"
android:textColor="#1d357d"
android:textSize="20dp"
android:textStyle="bold" />
</RelativeLayout>
<RelativeLayout
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight=".5" >
<Button
android:id="@+id/savedBtn"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#cccccc"
android:minHeight="100dp"
android:text="Saved Searches"
android:textColor="#1d357d"
android:textSize="20dp"
android:textStyle="bold" />
<TextView
android:id="@+id/newItemsOverlay"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/savedBtn"
android:layout_alignTop="@+id/savedBtn"
android:background="#ff0000"
android:text="10"
android:textColor="#FFF"
android:textSize="16sp"
android:textStyle="bold" />
</RelativeLayout>
</TableRow>
<TableRow
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginTop="30dip"
android:layout_weight="1"
android:minHeight="100dp" >
<RelativeLayout
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight=".5" >
<Button
android:id="@+id/checkNowBtn"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#cccccc"
android:minHeight="100dp"
android:text="Check Now"
android:textColor="#1d357d"
android:textSize="20dp"
android:textStyle="bold" />
</RelativeLayout>
<RelativeLayout
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight=".5" >
<Button
android:id="@+id/settingsBtn"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#cccccc"
android:minHeight="100dp"
android:text="Settings"
android:textColor="#1d357d"
android:textSize="20dp"
android:textStyle="bold" />
</RelativeLayout>
</TableRow>
</TableLayout>
</RelativeLayout>
This will solve your problem.
Thanks.