Align to the right of the screen with margin Android

Question

I have a Linearlayout within a RelativeLayout that I'm trying to align to the rightmost side of the screen with margin. Example:

How should I modify the LinearLayout's properties to achieve this? thanks

Here is the XML file(the name of the LinearLayout that should be aligned to right is slide_right):

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:gravity="top"
    tools:context=".MainActivity" >

    <WebView android:id="@+id/webview"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"/>

     <LinearLayout
        android:id="@+id/slide_left"
        android:layout_width="400dp"
        android:layout_height="550dp"
        android:layout_marginLeft="-367dp"
        android:layout_marginTop="150dp"
        android:background="@drawable/left_slide"
        android:orientation="vertical" >

    </LinearLayout>

    <LinearLayout
        android:id="@+id/slide_right"
        android:layout_width="400dp"
        android:layout_height="550dp"
       android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:layout_marginRight="-30dp"
        android:orientation="horizontal" 
        android:background="@drawable/right_slide">

    </LinearLayout>

    <LinearLayout
        android:id="@+id/header_linear_l"
        android:layout_width="match_parent"
        android:layout_height="80dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:orientation="horizontal" >

        <ImageButton
            android:id="@+id/mapbt"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/mapbt" />

        <ImageButton
            android:id="@+id/profilebt"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/profilebt" />



        <ImageButton
            android:id="@+id/settingsbt"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/settingsbt" />

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:orientation="vertical" >

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content" >

                <ImageButton
                    android:id="@+id/optionalbt"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:background="@drawable/optionbt" />

                <ImageButton
                    android:id="@+id/lvlbt"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:background="@drawable/levelbt" />
            </LinearLayout>

            <ProgressBar
                android:id="@+id/experiencebar"
                style="?android:attr/progressBarStyleHorizontal"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

        </LinearLayout>

    </LinearLayout>

    <ImageButton
        android:id="@+id/Attack_Button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/slide_left"
        android:layout_marginBottom="129dp"
        android:layout_marginLeft="36dp"
        android:layout_toRightOf="@+id/slide_left"
        android:src="@drawable/ic_launcher_old"
        android:visibility="invisible" />

</RelativeLayout>   

Answer 1

Change Your Relative layout's Property

from

  android:layout_width="wrap_content" 

to

  android:layout_width="match_parent"

thats it... (definitely I have tested it see below snapshot)