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In my Code I have a XML file having multiple child layouts. Aand I just want to set one of these child layout's width programmatically according to device's screen width. till now I had tried Layout params, setparam, and other methods but it shows null pointer exception on getting layout id. my parent layout is a Relative Layout, and 1st Child Layout is a Linear Layout("for this layout I need to change width") <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/parentlayout" android:layout_width="fill_parent" android:layout_height="fill_parent"> <LinearLayout android:id="@+id/childlayout" android:layout_width="250dip" android:layout_height="fill_parent" android:orientation="vertical" android:background="#153746"> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical" android:background="@drawable/sub_title" android:gravity="center_vertical" > <TextView android:id="@+id/menu_header_label" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textStyle="bold" android:text="asd" android:textColor="#ffffff" android:layout_marginLeft="10dip" /> <ImageView android:id="@+id/menu_header" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" /> </LinearLayout> <ListView android:id="@+id/menu_listview" android:layout_width="fill_parent" android:layout_height="wrap_content" android:divider="@android:color/darker_gray" android:divid

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