Spacing (Spoofed Keyboard) Buttons Evenly Across Android LinearLayout

I have an XML layout which I'm attempting to add a series of buttons to (A-Z). Thus far I have been able to do so - however they appear lumped together on the left hand side. I'd like for them to be evenly spaced - and I thought that using something such as:

 android:layout_marginLeft="fill_parent"
 android:layout_marginRight="fill_parent"

Would space them evenly across the screen - however I'm left with multiple errors stating:

 "Error: String types not allowed (at 'layout_marginLeft' with value 'fill_parent')."

ScreenShot: http://ift.tt/1IykDdR

Current Source:

<FrameLayout
    android:id="@+id/content_frame"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<LinearLayout
    android:id="@+id/drawer"
    android:layout_width="240dp"
    android:layout_height="match_parent"
    android:layout_gravity="end"
    android:background="@android:color/white"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/drawer_list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@android:color/black"
        android:choiceMode="singleChoice"
        android:divider="@android:color/darker_gray"
        android:dividerHeight="0.1dp"
        android:textColor="@android:color/white" />
</LinearLayout>

<ListView
    android:id="@+id/left_drawer"
    android:layout_width="240dp"
    android:layout_height="match_parent"
    android:layout_gravity="right"
    android:background="#111"
    android:choiceMode="singleChoice"
    android:divider="@android:color/transparent"
    android:dividerHeight="0dp" />

<LinearLayout
    android:id="@+id/mainContent"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="00dp"
    android:layout_marginTop="0dp"
    android:orientation="vertical" >

    <!-- 1st Child Layout  (Nested In Parent Layout) with Horizontal Orientation -->

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="15dp"
        android:layout_marginTop="15dp"
        android:background="@drawable/searchbar"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        android:paddingLeft="20dip" >

        <EditText
            android:id="@+id/editText1"
            android:layout_width="380dp"
            android:layout_height="30dp"
            android:layout_alignParentTop="true"
            android:background="@drawable/searchbartxtcontainer"
            android:ems="10"
            android:hint="  Search Movies" >

            <requestFocus />
        </EditText>

        <Spinner
            android:id="@+id/spinner1"
            android:layout_marginLeft="50dp"
            android:entries="@array/home_spinner1_array"
             android:prompt="@string/select_location" 
            android:layout_width="100dp"
            android:layout_height="30dp"
            android:layout_toRightOf="@+id/editText1"
            android:background="@drawable/searchbartxtcontainer"
            android:textColor="@android:color/white" 
            android:hint="Rating" />

        <Spinner
            android:id="@+id/spinner2"
            android:entries="@array/home_spinner2_array"
             android:text="Genre"
            android:layout_width="140dp"
            android:layout_height="30dp"
            android:layout_alignTop="@+id/spinner1"
            android:layout_marginLeft="50dp"
            android:textColor="@android:color/white" 
            android:hint="Genre" 
            android:layout_toRightOf="@+id/spinner1"
            android:background="@drawable/searchbartxtcontainer" />

        <Button
            android:id="@+id/button1"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="33dp"
            android:textColor="@android:color/white"
            android:layout_marginLeft="50dp"
            android:background="#4D4D4D"
            android:layout_toRightOf="@+id/spinner2"
            android:text="Reset" />



        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"

            android:layout_toRightOf="@+id/button1"
            android:layout_marginLeft="50dp"
            android:text="Sort by:"
            android:textColor="@android:color/white"  />

        <Spinner
            android:id="@+id/spinner3"
            android:layout_width="120dp"
            android:layout_height="30dp"
            android:layout_alignTop="@+id/textView1"
            android:layout_marginLeft="20dp"
            android:layout_toRightOf="@+id/textView1"
            android:background="@drawable/searchbartxtcontainer"
            android:hint="Release Date" 
            android:textColor="@android:color/white" />
    </LinearLayout>

    <!-- 2nd Child Layout  (Nested In Parent Layout) with Horizontal Orientation -->

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#000000"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        android:paddingLeft="20dip" >

        <Button
            android:id="@+id/buttona"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="A" />

        <Button
            android:id="@+id/buttonb"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="B" />

        <Button
            android:id="@+id/buttonc"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="C" />

        <Button
            android:id="@+id/buttond"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="D" />

        <Button
            android:id="@+id/buttone"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="E" />

        <Button
            android:id="@+id/buttonf"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="F" />

        <Button
            android:id="@+id/buttong"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="G" />

        <Button
            android:id="@+id/buttonh"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="H" />

        <Button
            android:id="@+id/buttoni"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="I" />

        <Button
            android:id="@+id/buttonj"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="J" />

        <Button
            android:id="@+id/buttonk"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="K" />

        <Button
            android:id="@+id/buttonl"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="L" />

        <Button
            android:id="@+id/buttonm"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="M" />

        <Button
            android:id="@+id/buttonn"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="N" />

        <Button
            android:id="@+id/buttono"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="O" />

        <Button
            android:id="@+id/buttonp"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="P" />

        <Button
            android:id="@+id/buttonq"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="Q" />

        <Button
            android:id="@+id/buttonr"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="R" />

        <Button
            android:id="@+id/buttons"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="S" />

        <Button
            android:id="@+id/buttont"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="T" />

        <Button
            android:id="@+id/buttonu"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="U" />

        <Button
            android:id="@+id/buttonv"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="V" />

        <Button
            android:id="@+id/buttonw"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="W" />

        <Button
            android:id="@+id/buttonx"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="X" />

        <Button
            android:id="@+id/buttony"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="Y" />

        <Button
            android:id="@+id/buttonz"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginLeft="fill_parent"
            android:layout_marginRight="fill_parent"
            android:layout_toRightOf="@+id/spinner2"
            android:text="Z" />
    </LinearLayout>

    <ScrollView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_below="@+id/imageView1" >

        <!-- 3rd Child Layout  (Nested In Parent Layout) with Horizontal Orientation -->

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="0dp"
            android:background="#000000"
            android:orientation="vertical" >

            <!-- Container view to scroll horizontally which gives the carousel effect -->

            <HorizontalScrollView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:scrollbars="none" >

                <!-- Carousel items container - lays out items horizontally -->

                <LinearLayout
                    android:id="@+id/carousel1"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal" />
            </HorizontalScrollView>

            <!-- Container view to scroll horizontally which gives the carousel effect -->

            <HorizontalScrollView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:scrollbars="none" >

                <!-- Carousel items container - lays out items horizontally -->

                <LinearLayout
                    android:id="@+id/carousel2"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="5dp"
                    android:orientation="horizontal" />
            </HorizontalScrollView>

            <!-- Container view to scroll horizontally which gives the carousel effect -->

            <HorizontalScrollView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:scrollbars="none" >

                <!-- Carousel items container - lays out items horizontally -->

                <LinearLayout
                    android:id="@+id/carousel3"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="5dp"
                    android:orientation="horizontal" />
            </HorizontalScrollView>

            <!-- Container view to scroll horizontally which gives the carousel effect -->

            <HorizontalScrollView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:scrollbars="none" >

                <!-- Carousel items container - lays out items horizontally -->

                <LinearLayout
                    android:id="@+id/carousel4"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="5dp"
                    android:orientation="horizontal" />
            </HorizontalScrollView>

            <!-- Container view to scroll horizontally which gives the carousel effect -->

            <HorizontalScrollView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:scrollbars="none" >

                <!-- Carousel items container - lays out items horizontally -->

                <LinearLayout
                    android:id="@+id/carousel5"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="5dp"
                    android:orientation="horizontal" />
            </HorizontalScrollView>

            <HorizontalScrollView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:scrollbars="none" >

                <!-- Carousel items container - lays out items horizontally -->

                <LinearLayout
                    android:id="@+id/carousel6"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="5dp"
                    android:orientation="horizontal" />
            </HorizontalScrollView>

            <HorizontalScrollView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:scrollbars="none" >

                <!-- Carousel items container - lays out items horizontally -->

                <LinearLayout
                    android:id="@+id/carousel7"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="5dp"
                    android:orientation="horizontal" />
            </HorizontalScrollView>
        </LinearLayout>
    </ScrollView>
    <!-- 4th Child Layout  (Nested In Parent Layout) with Horizontal Orientation -->

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

        <ImageView
            android:id="@+id/imageView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/clear" />
    </LinearLayout>
</LinearLayout>

<ProgressBar
    android:id="@+id/progress_bar"
    style="?android:attr/progressBarStyleLarge"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:indeterminateDrawable="@drawable/ic_launcher"
    android:visibility="gone" >
</ProgressBar>
<!-- List of Actions (pages) -->

<ListView
    android:id="@+id/navList"
    android:layout_width="280dp"
    android:layout_height="match_parent"
    android:layout_below="@+id/profileBox"
    android:layout_gravity="end"
    android:background="#ffffffff"
    android:choiceMode="singleChoice" />

<ImageView
    android:id="@+id/drawer_item_icon"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />