レイアウトの余白を埋める ref: http://qiita.com/nein37/items/83f6db980a036298a7be

file0.java

    /**
     * Draw nothing.
     *
     * @param canvas an unused parameter.
     */
    @Override
    public void draw(Canvas canvas) {
    }

file1.txt

compile 'com.android.support:gridlayout-v7:20.0.+'

file2.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/darker_gray"
    android:orientation="vertical">
    <ImageView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:src="@drawable/kani" />

    <android.support.v7.widget.Space
        android:layout_width="match_parent"
        android:layout_height="50dp" />

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:src="@drawable/kani" />

</LinearLayout>

file3.xml

    <android.support.v7.widget.Space
        android:layout_width="match_parent"
        android:background="@android:color/white"
        android:layout_height="50dp" />