Android set navigation drawer list to open exact half of the screen for all device screen

I want to open the drawerlist to the half of the screen for all different device. i tried hard coded values for layout_margineleft 200dp or 100dp to the drawerlist. but it doesn't work in all device it different from device to device. so how can i maintain the exactly half of the screen for drawerlist. i also tried various function like setLeft(int) etc.but some of them doesn't work due to i use minimum version 8. So please help me. thanks in advance. ``` mDrawerLayout = (DrawerLayout) view.findViewById(R.id.drawer_layout); mDrawerList = (ListView) view.findViewById(R.id.top_sectionlist); ``` xml for that: ``` <?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/drawer_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/setting_background" > <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="fill_parent" android:layout_margin="@dimen/top_news_linear_margin" android:background="@color/news_list_divider_color" android:orientation="vertical" android:padding="@dimen/top_news_linear_padding" > </RelativeLayout> <ListView android:id="@+id/drawer_list" android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_gravity="right" android:layout_alignParentTop="true" android:background="@color/setting_background" android:cacheColorHint="@android:color/transparent" android:choiceMode="singleChoice" android:divider="@color/news_list_divider_color" android:dividerHeight="@dimen/news_list_divider_height" /> </android.support.v4.widget.DrawerLayout> ```