Responsive Layout for different devises

Responsive Layout.xml

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

    tools:context="com.example.shohruh.otherlayouts.MainActivity">


    <LinearLayout
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <LinearLayout
            android:orientation="vertical"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent">

            <LinearLayout
                android:orientation="horizontal"
                android:layout_width="match_parent"
                android:layout_weight="1"
                android:layout_height="wrap_content">

                <LinearLayout
                    android:orientation="vertical"
                    android:layout_width="0dp"
                    android:layout_weight="1"
                    android:layout_height="fill_parent">


                    <Button
                        android:layout_height="fill_parent"
                        android:layout_width="fill_parent" />


                </LinearLayout>

                <LinearLayout
                    android:orientation="vertical"
                    android:layout_width="0dp"
                    android:layout_weight="1"
                    android:layout_height="fill_parent">


                    <Button
                        android:layout_height="fill_parent"
                        android:layout_width="fill_parent" />


                </LinearLayout>
            </LinearLayout>

            <LinearLayout
                android:orientation="horizontal"
                android:layout_weight="1"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content">

                <LinearLayout
                    android:orientation="vertical"
                    android:layout_width="0dp"
                    android:layout_weight="1"
                    android:layout_height="fill_parent">


                    <Button
                        android:layout_height="fill_parent"
                        android:layout_width="fill_parent" />
                </LinearLayout>

                <LinearLayout
                    android:orientation="vertical"
                    android:layout_width="0dp"
                    android:layout_weight="1"
                    android:layout_height="fill_parent">


                    <Button
                        android:layout_height="fill_parent"
                        android:layout_width="fill_parent" />
                </LinearLayout>
            </LinearLayout>
        </LinearLayout>
    </LinearLayout>
</RelativeLayout>