如何在网格布局中居中显示图像按钮- Android Studio

<android.support.v7.widget.GridLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/gridLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:columnCount="2"
    android:rowCount="2">
</android.support.v7.widget.GridLayout>

<android.support.v7.widget.GridLayout
    ...
    >
    <ImageButton
        android:id="@+id/imageButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/your_image"
        android:scaleType="centerInside"
        android:layout_gravity="center"
        android:layout_column="0"
        android:layout_row="0"
        android:layout_columnSpan="2"
        android:layout_rowSpan="2" />
</android.support.v7.widget.GridLayout>