使用SwipeBackLayout實現滑動退出頁面的效果

先提供SwipeBackLayout的github:SwipeBackLayout

很簡單，四步：

1. gradle  

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

2.extends SwipeBackActivity

3.給activity的主題裡面加一句：

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

4.拿到 SwipeBackLayout,然後設定方向

mSwipeBackLayout = getSwipeBackLayout();

mSwipeBackLayout.setEdgeTrackingEnabled(SwipeBackLayout.EDGE_LEFT);

方向有四個選項：

SwipeBackLayout.EDGE_LEFT

SwipeBackLayout.EDGE_RIGHT

SwipeBackLayout.EDGE_BOTTOM

SwipeBackLayout.EDGE_ALL