How add LinearLayout and RelativeLayout programmatically in a ScrollView?

How I can add LinearLayout and RelativeLayout programmatically in a ScrollView :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ScrollView
        android:id="@+id/scrollID"
        android:layout_width="fill_parent"
        android:layout_height="0dip"
        android:layout_weight="1" >


    </ScrollView>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:baselineAligned="true"
        android:orientation="horizontal"
        android:paddingBottom="5dp"
        android:paddingLeft="5dp"
        android:paddingRight="5dp"
        android:weightSum="1.5" 
        android:background="@drawable/bottom_conversation">

           <TextView
            android:id="@+id/isTyping"
            android:layout_width="0dip"
            android:layout_weight="0.5"
            android:layout_height="wrap_content"
            android:hint="Chat" />

        <EditText
            android:id="@+id/txtInpuConversation"
            android:layout_width="200dip"
            android:layout_height="wrap_content"
            android:layout_weight="0.5"
            android:hint="@string/edt_Conversation" >

            <requestFocus />
        </EditText>

        <ImageButton
            android:id="@+id/someID"
            android:layout_width="0dip"
            android:layout_weight="0.5"
            android:layout_height="wrap_content"
            android:background="@drawable/background_selector"
            android:contentDescription="@null"
            android:layout_marginTop="5dp"
            android:src="@drawable/social_send_now" />
    </LinearLayout>

</LinearLayout>

Notice : I need that RelativeLayout insert in LinearLayout