Android : SeekBar not showing up on view xml file

I am trying to get the SeekBar to display at the bottom of the screen but actually under the LinerLayout I created, but I can't seem to get it to display. I have split the screen into 5 sections and want the seek bar at the bottom of the screen, where am I going wrong?

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/gray"
android:orientation="horizontal"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin" >

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1.0"
        android:orientation="vertical" >

        <FrameLayout
            android:id="@+id/white"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_margin="3dp"
            android:layout_weight="1.0"
            android:background="@color/white" />

        <FrameLayout
            android:id="@+id/green"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_margin="3dp"
            android:layout_weight="1.0"
            android:background="@color/green" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1.0"
        android:orientation="vertical" >

        <FrameLayout
            android:id="@+id/blue"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_margin="3dp"
            android:layout_weight="1.0"
            android:background="@color/blue" />

        <FrameLayout
            android:id="@+id/red"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_margin="3dp"
            android:layout_weight="1.0"
            android:background="@color/red" />

        <FrameLayout
            android:id="@+id/yellow"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_margin="3dp"
            android:layout_weight="1.0"
            android:background="@color/yellow" />
    </LinearLayout>

    <SeekBar
        android:id="@+id/seekBar1"
        android:layout_width="0dp"
        android:layout_height="wrap_content" />
</LinearLayout>