Android : Align three control side by side in Android

I am new in Android I wanna put controls like this,but I can't:

---

textview1

edittext1 edittext2 textview2

<?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:weightSum = "1.0"
    android:orientation="horizontal"
    android:background = "#faadadad" >
    <TextView
        android:layout_width="match_parent"
        android:layout_height="44dp"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Final"
        android:id="@+id/textView4"
        android:layout_gravity="center_horizontal" />


    <LinearLayout android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="0.8">
        <EditText
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft = "2dip"
            android:layout_marginTop = "1dip"
            android:layout_marginBottom = "1dip"
            android:hint="Search Terms" />
    </LinearLayout>
    <Button android:text = "grade:"
        android:layout_width = "0dip"
        android:layout_height="wrap_content"
        android:layout_weight = "0.2"/>


</LinearLayout>

with above code , edittext1 and edittext2 and textview2 shows out of screen and under the textview1