时间轴Step by step，just use HorizontalStepView，VerticalStepView. step indicator，flow indicator，timeline，order process，express status

(放淘宝商品详情滚动)vertical slide to switch to the next fragment page, looks like vertical viewpager

(动态滚动)Scrollable list of items, where current item is centered and can be changed using swipes

(数字键盘)A customisable decimal and hexadecimal material picker view for Android.

(音乐播放器源码)A material designed music player for Android

(时间格式化)Android date/time formatting library supporting formatting placeholders

(类似QQ消息提醒)CookieBar is a lightweight library for showing a brief message at the top or bottom of the screen.

(取色)This is ColorPickerView by skydoves

VerticalViewPager与VertialTabLayout的结合使用

Easy Swipe Maker

(箭头变换)Nice and simple customizable implementation of Google style up/down expand arrow.

(Android使用HTML)Build valid HTML for Android TextView

java implement Higher-order function ，support map，filter with parallel, android

(图片加载工具)It's a custom image-loading repository for Android.

(底部导航条)This is a awesome TabLayout for Android with a central Floating Action Button :D

(双向进度条)SimpleRangeView is custom view component for Android, that provides for the selection of a range

(翻页效果时钟)

(图片滚动缩放)Provides parallax effects when ImageView scrolls in the screen.

Android BottomBar封装底部TAB导航栏，支持显示红点和数字提醒。

(购物车添加数量)Custom view to pick up a value from a given range using click button or swiping.

(竖向TextView)PlumbTextView is a vertical textview.

(图片剪切圆弧)With Arc Layout explore new styles and approaches on material design

可以配置水平和垂直滚动的HVScrollView，参照NestedScrollView和RecyclerView代码写的

（炫酷时钟）The core of it is SVG .

（代码改变drawable颜色）Android library to change drawable color dynamically

（仪表板）Imitation of Ali credit sesame new old ring view.http://www.jianshu.com/p/8486a5baa708

（双悬停列表）An Android library for double level section headers that stick to the top of list.

（TextView 折叠）Expandable TextView With Smooth Transition Animation

(时间倒计时)Android Countdown View

（图片压缩）Luban(鲁班)——可能是最接近微信朋友圈的图片压缩算法