public void setDragEdge(DragEdge dragEdge) {
        this.dragEdge = dragEdge;
    }
Swipe or Pull to finish a Activity.
<p/>
This layout must be a root layout and contains only one direct child view.
<p/>
The activity must use a theme that with translucent style.
<style name="Theme.Swipe.Back" parent="AppTheme">
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">@android:color/transparent</item>
</style>
<p/>
Created by Eric on 15/1/8.
library/src/main/java/com/liuguangqiang/swipeback/SwipeBackLayout.java