StickyNavigationBar

Listview上下滑动，导航栏view可吸附在顶部的效果，仿微博、人人的feed详情页面。

效果如下：

Name		Name	Last commit message	Last commit date
Latest commit History 6 Commits
app		app
gradle/wrapper		gradle/wrapper
preview		preview
.gitignore		.gitignore
LICENSE		LICENSE
README.md		README.md
build.gradle		build.gradle
gradle.properties		gradle.properties
gradlew		gradlew
gradlew.bat		gradlew.bat
settings.gradle		settings.gradle

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