使用SwipeBackLayout实现滑动退出页面的效果

先提供SwipeBackLayout的github:SwipeBackLayout

很简单，四步：

1. gradle  

compile 'me.imid.swipebacklayout.lib:library:1.0.0'

2.extends SwipeBackActivity

3.给activity的主题里面加一句：

<item name="android:windowIsTranslucent">true</item>

4.拿到 SwipeBackLayout,然后设置方向

mSwipeBackLayout = getSwipeBackLayout();

mSwipeBackLayout.setEdgeTrackingEnabled(SwipeBackLayout.EDGE_LEFT);

方向有四个选项：

SwipeBackLayout.EDGE_LEFT

SwipeBackLayout.EDGE_RIGHT

SwipeBackLayout.EDGE_BOTTOM

SwipeBackLayout.EDGE_ALL