In my application have six buttons,the screen size is 4.65" 720p(720X1280 : xhdpi),device take this resolution from normal layout folder.when i run it in device.it display like the image am shown below.how to set this six buttons fit to the screen according to layout width and height.I don't know how to do.Can any one know please help me to solve this problem.

My XML coding

 <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/home_xml"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff" >

<Button
    android:id="@+id/btn_login"
    android:layout_width="101dp"
    android:layout_height="193dp"
    android:layout_alignParentLeft="true"
    android:layout_below="@+id/imageView1"
    android:layout_marginLeft="4dp"
    android:layout_marginTop="78dp"
    android:background="@drawable/login_button" />

<Button
    android:id="@+id/btn_order"
    android:layout_width="101dp"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/btn_login"
    android:layout_alignTop="@+id/btn_login"
    android:layout_marginLeft="3dp"
    android:layout_toRightOf="@+id/btn_login"
    android:background="@drawable/order_button" />

<Button
    android:id="@+id/btn_abtus"
    android:layout_width="101dp"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/btn_order"
    android:layout_alignTop="@+id/btn_order"
    android:layout_marginLeft="3dp"
    android:layout_toRightOf="@+id/btn_order"
    android:background="@drawable/aboutus_button" />

<Button
    android:id="@+id/btn_outlet"
    android:layout_width="100dp"
    android:layout_height="198dp"
    android:layout_alignLeft="@+id/btn_login"
    android:layout_alignRight="@+id/btn_login"
    android:layout_below="@+id/btn_login"
    android:background="@drawable/outlets_button" />

<Button
    android:id="@+id/btn_feedback"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/btn_outlet"
    android:layout_alignLeft="@+id/btn_order"
    android:layout_alignRight="@+id/btn_order"
    android:layout_alignTop="@+id/btn_outlet"
    android:background="@drawable/feedback_button" />

<Button
    android:id="@+id/btn_games"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/btn_feedback"
    android:layout_alignLeft="@+id/btn_abtus"
    android:layout_alignRight="@+id/btn_abtus"
    android:layout_alignTop="@+id/btn_feedback"
    android:background="@drawable/games_button" />

<RelativeLayout
    android:id="@+id/relativeLayout1"
    android:layout_width="match_parent"
    android:layout_height="44dp"
    android:layout_alignParentRight="true"
    android:layout_alignParentTop="true"
    android:background="#98110e" >
</RelativeLayout>