android 侧滑栏

界面

界面布局:
` xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:id="@+id/dl_main"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".activity.MainActivity">

`

private DrawerLayout dl_main;
//利用点击事件打开侧滑栏
dl_main.openDrawer(Gravity.LEFT);