android - LinearLayout Line up -

i have edittext , want imagebutton left of it. want edittext's width fill_parent except leave room imagebutton. right edittext isn't leaving room. have them nested in linearlayout.

<?xml version="1.0" encoding="utf-8"?> <linearlayout      xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     >     <linearlayout          android:layout_height="wrap_content"          android:id="@+id/linearlayout1"          android:layout_width="fill_parent"          android:orientation="horizontal"          >         <edittext              android:id="@+id/edittext1"              android:layout_marginleft="10dp"              android:layout_height="wrap_content"              android:layout_marginright="10dp"              android:layout_width="fill_parent"         />         <imagebutton              android:id="@+id/imagebutton1"              android:layout_height="wrap_content"              android:src="@drawable/icon"              android:layout_width="wrap_content"         />     </linearlayout>  ...  </linearlayout> 

change android:layout_width="0dp" , add android:layout_weight="1" edittext.