Android-pulltorefresh
A powerful pull refresh open source project that supports various controls drop-down refreshes ListView, Viewpager, Wevview, Expandablelistview, GridView, (horizontal) ScrollView, Fragment
Pull the refresh up or down, more powerful than the Johannilsson that only support the ListView. And he realizes that the dropdown refresh ListView will not show a refresh prompt in the case of item less than one screen, the experience is better.
Project Address: Https://github.com/chrisbanes/Android-PullToRefresh
Demo Address: Https://github.com/Trinea/TrineaDownload/blob/master/pull-to-refreshview-demo.apk?raw=true
Actionbarsherlock
All versions of Android provide a unified Actionbar to address the adaptation issues of the following 4.0 Actionbar
Project Address: Https://github.com/JakeWharton/ActionBarSherlock
Demo Address: Https://play.google.com/store/apps/details?id=com.actionbarsherlock.sample.demos
Slidingmenu
Slide-out menu, slide out menu by dragging screen edge, support screen left and right, support menu zoom, scale and slide up three kinds of animation styles appear.
Project Address: Https://github.com/jfeinstein10/SlidingMenu
Demo Address: Https://play.google.com/store/apps/details?id=com.slidingmenu.example
App Examples: Foursquare, LinkedIn, Zappos, Rdio, Evernote Food, Plume, VLC for Android, ESPN Scorecenter, MLS matchday, 9GAG, Wun Derlist 2, the Verge, MTG familiar, Mantano Reader, Falcon Pro (BETA), MW3 Barracks
Menudrawer and Slidingmenu Comparison: Slidingmenu support menu animation styles appear, Menudrawer support menu view in the upper and lower layers of content
Smoothprogressbar
horizontal progress bar
Project address: https://github.com/castorflex/ Smoothprogressbar
Demo Address: https://play.google.com/store/apps/details?id= Fr.castorflex.android.smoothprogressbar.sample
progresswhe support progress display for circular PROGRESSBA Project address: https://github.com/Todd-Davies/ Progresswheel
demo address: https:// Github.com/trinea/trineadownload/blob/master/progress-wheel-demo.apk?raw=true
Android-calendar-card Calendar  
Project address: Https://github.com/kenumir/android-calendar-card
Demo Address: https://play.google.com/store/apps/ Details?id=com.wt.calendarcardsample
Androidwheel Android Wheel support City, multiple datetime, password, picture
Project Address: Https://github.com/sephiroth74/AndroidWheel
Android-async-http
An asynchronous, callback-based HTTP client development package on Android, built on Apache's httpclient library.
Https://github.com/loopj/android-async-http
Android-universal-image-loader
One of the biggest headaches on Android is getting pictures, displays, and recycling from the web, and it's possible that the project can help you with any problem.
Https://github.com/nostra13/Android-Universal-Image-Loader
Aurora Push
Friends League UPDATE Statistics
Baidu Map + Location
SHARESDK Social Sharing
Time processing
File processing
Character processing
JSON parsing
System Information judgment
Internet
SD Card
IMEI acquisition etc.
No.4 common frameworks and tools in Android development