EffectDemo/app/src/main/res/layout/activity_list.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorWhite">

    <com.xunao.effectdemo.DragGridView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:listSelector="@android:color/transparent"
        android:cacheColorHint="@android:color/transparent"
        android:layout_margin="10dp"
        android:id="@+id/dgv"
        android:gravity="center"
        android:verticalSpacing="10dp"
        android:horizontalSpacing="10dp"
        android:stretchMode="columnWidth">

    </com.xunao.effectdemo.DragGridView>


</RelativeLayout>