c# - Change layout size depends on Screen size -

i'm new in android programming. wrote small app. when launched on 4.7" screen device looks small. how can make autoscaling different sizes of screen?

my xml:

<?xml version="1.0" encoding="utf-8"?>  <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"      android:orientation="vertical"      android:weightsum="100"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:minwidth="25px"      android:minheight="25px">      <framelayout          android:layout_width="wrap_content"          android:layout_height="267.9dp"          android:weight="100"          android:id="@+id/framelayout1">          <imageview              android:src="@drawable/fone"              android:layout_width="match_parent"              android:layout_height="match_parent"              android:scaletype="centercrop"              android:id="@+id/imageview1" />          <linearlayout              android:orientation="horizontal"              android:layout_width="match_parent"              android:layout_height="140dp"              android:id="@+id/linearlayout1"              android:layout_marginbottom="0.0dp">              <imagebutton                  android:src="@android:drawable/ic_menu_gallery"                  android:layout_width="49.0dp"                  android:layout_height="50.8dp"                  android:id="@+id/privatebutton"                  android:layout_marginright="98.9dp"                  android:background="#00000000" />              <imagebutton                  android:src="@drawable/logo"                  android:layout_width="75.3dp"                  android:layout_height="64.1dp"                  android:id="@+id/logobutton"                  android:layout_marginright="113.7dp"                  android:background="#00000000" />              <imagebutton                  android:src="@android:drawable/ic_menu_gallery"                  android:layout_width="49.0dp"                  android:layout_height="50.8dp"                  android:id="@+id/cartbutton"                  android:background="#00000000" />          </linearlayout>      </framelayout>      <linearlayout          android:orientation="horizontal"          android:minwidth="25px"          android:minheight="25px"          android:layout_width="match_parent"          android:layout_height="142.7dp"          android:id="@+id/linearlayout2">          <button              android:text="Суші"              android:layout_width="192.8dp"              android:layout_height="fill_parent"              android:id="@+id/button1"              android:background="@drawable/sushi"              android:textcolor="#ffffff"              android:textsize="20sp"              android:textstyle="bold" />          <button              android:text="Роли"              android:layout_width="192.8dp"              android:layout_height="fill_parent"              android:id="@+id/button2"              android:background="@drawable/rolli"              android:textcolor="#ffffff"              android:textsize="20sp"              android:textstyle="bold" />      </linearlayout>      <linearlayout          android:orientation="horizontal"          android:minwidth="25px"          android:minheight="25px"          android:layout_width="match_parent"          android:layout_height="142.7dp"          android:id="@+id/linearlayout3">          <button              android:text="Сети"              android:layout_width="192.8dp"              android:layout_height="match_parent"              android:id="@+id/button3"              android:background="@drawable/sets"              android:textcolor="#ffffff"              android:textsize="20sp"              android:textstyle="bold" />          <button              android:text="Холодні Закуски"              android:layout_width="192.8dp"              android:layout_height="match_parent"              android:id="@+id/button4"              android:background="@drawable/holodni"              android:textcolor="#ffffff"              android:textsize="20sp"              android:textstyle="bold" />      </linearlayout>      <linearlayout          android:orientation="horizontal"          android:minwidth="25px"          android:minheight="25px"          android:layout_width="match_parent"          android:layout_height="70.2dp"          android:id="@+id/linearlayout4"          android:layout_marginleft="0.0dp">          <linearlayout              android:orientation="horizontal"              android:layout_width="fill_parent"              android:layout_height="65dp"              android:background="#f2565c"              android:id="@+id/linearlayout5">              <imagebutton                  android:src="@drawable/back"                  android:layout_width="49.0dp"                  android:layout_height="50.8dp"                  android:id="@+id/previousbutton"                  android:layout_marginright="120.8dp"                  android:background="#00000000"                  android:layout_margintop="8.6dp"                  android:clickable="true" />              <imagebutton                  android:src="@drawable/home"                  android:layout_width="49.0dp"                  android:layout_height="50.8dp"                  android:id="@+id/homebutton"                  android:layout_marginright="117.5dp"                  android:background="#00000000"                  android:layout_margintop="7.4dp"                  android:clickable="true" />              <imagebutton                  android:src="@drawable/next"                  android:layout_width="49.0dp"                  android:layout_height="50.8dp"                  android:id="@+id/nextbutton"                  android:layout_marginleft="0.0dp"                  android:background="#00000000"                  android:layout_margintop="8.6dp"                  android:clickable="true" />          </linearlayout>      </linearlayout>  </linearlayout>

and should written in xml or in main activity?

if want application support different screen sizes should try use views not mocked values like:

android:layout_height="140dp"

but play values: match_parent & wrap_content, example:

android:layout_height="wrap_content" android:layout_width="match_parent" 

to align components play gravity , layout_gravity properties. example:

android:layout_gravity="center_horizontal" android:gravity="center"