http://blog.andresteingress.com/2011/09/27/fighting-orientation-changes-in-android/
http://courses.coreservlets.com/Course-Materials/pdf/android/Android-Drawing-1.pdf
http://wptrafficanalyzer.in/blog/different-layouts-for-different-screen-sizes-in-android/
http://blogactivity.wordpress.com/2012/02/22/smart-headers-and-footers-in-scrollviews/
http://www.chess-ix.com/2012/01/17/the-use-of-layout_weight-with-android-layouts/
Above link will tell how to start method or activity after some time say 30 min or 5 seconds etc
https://www.udemy.com/learn-android-programming-from-scratch-beta/
Best link for GCM Client and Server
http://avilyne.com/?p=267
How to use a ScheduledThreadPoolExecutor
http://codelatte.wordpress.com/2013/11/13/49/
Four ways of scheduling recurring task in android
http://stackoverflow.com/questions/14376470/scheduling-recurring-task-in-android
Best link on Java Annotations
http://www.java2novice.com/java-annotations/custom/
Best link on how to implement Google Play Services
Badge ICON similar to IOS in Android
http://vardhan-justlikethat.blogspot.de/2014/07/android-ios-style-badge-app-icon-for.html
My google site contains this sample project
Dynamically inflating the layout
http://www.mysamplecode.com/2011/10/android-dynamic-layout-using-xml-add.html
how to browse sqlite data in emulator
http://www.techrepublic.com/blog/software-engineer/browse-sqlite-data-on-the-android-emulator/
Best link for gallery with dots(page indicator)
http://www.myandroidsolutions.com/2012/04/21/android-gallery-with-dots-on-scroll/
hashmap-single-key-multiple-values
http://www.skilledmonster.com/2013/10/21/hashmap-single-key-multiple-values-example/
Best link for custom Toggle Button
http://www.coderzheaven.com/2012/05/20/create-custom-toggle-button-android/
check google site too
ANT Script Links
http://jeffreysambells.com/2013/02/14/build-your-android-apk-with-the-manifest-version-number
http://www.irasenthil.com/2013/01/android-how-to-version-command-line.html
http://www.programmingodyssey.com/2013/01/create-signed-build-of-android.html
VS Communication with hardware
http://english.cxem.net/arduino/arduino5.php
http://digitalhacksblog.blogspot.de/2012/05/arduino-to-android-basic-bluetooth.html
http://digitalhacksblog.blogspot.de/2012/05/arduino-to-android-turning-led-on-and.html
http://www.intorobotics.com/how-to-develop-simple-bluetooth-android-application-to-control-a-robot-remote/
Best link for android DB operations update happens based on the unique_id(auto inc) used in DB
http://chintankhetiya.wordpress.com/2013/06/01/sqlite-database-example/comment-page-1/#comment-614
Check google site too
Best link on db information android
http://androidshortnotes.blogspot.in/2013/03/store-data-in-android.html
Best link on db information android
http://androidsolution4u.blogspot.in/2013/09/android-populate-listview-from-sqlite.html
Best link to check whether android device has BLE (Bluetooth Low Energy)support or not
http://weimenglee.blogspot.in/2013/10/check-if-your-android-device-supports.html
Blog
http://www.compiletimeerror.com/search/label/Android%20Basics#.VIFpqmL0xQL
Avoid Out Of Memory Error BitMap
http://stackoverflow.com/questions/15377186/decode-file-from-sdcard-android-to-avoid-out-of-memory-error-due-to-large-bitmap
http://www.php-intro.com/software-mac-xampp.php
Execute Robotium Test Cases in specific order
http://www.androiddevelopersolutions.com/2014/03/android-robotium-run-robotium-tests-in.html
Tab layout Material Design
http://www.androidhive.info/2015/09/android-material-design-working-with-tabs/
Espresso Links Android
http://evgenii.com/blog/testing-activity-in-android-studio-tutorial-part-3/
http://blog.sqisland.com/2015/04/espresso-custom-idling-resource.html
http://blog.novatec-gmbh.de/mobile-testing-espresso-framework/
https://androidresearch.wordpress.com/2015/04/04/an-introduction-to-espresso/
https://mayojava.github.io/android/android-ui-instrumentation-test-with-espresso/
Junit Parameterized Test
http://www.java2s.com/Tutorials/Java/JUnit/0140__JUnit_Parameterized_Test.htm
Jenkins
http://www.everybodytests.com/2015/04/jenkins-devices-androidjunitrunner.html
https://www.cloudbees.com/sites/default/files/2014-0625-Berlin-Christopher_Orr-Build_Test_Deploy_w-Android.pdf
Best Java and Android Blogs
https://mindorks.com/blogs
https://javaradar.blogspot.in/2017/03/class-variable-vs-instance-variable-in.html
http://wiki.workassis.com/android-how-to-set-a-ripple-effect/
Android native scripting
http://docs.nativescript.org/tutorial/chapter-1
https://docs.nativescript.org/angular/integration-with-existing-ios-and-android-apps/extend-existing-android-app-with-ns-angular2.html
BestLinks forCalendar Apps
https://github.com/luvyouso/CalendarGoogle2016
https://github.com/khacpv/Calendar-Day-View/blob/master/README.md
https://github.com/AnilMH/Android-WeekView-Demo
Drag n Drop
http://stackoverflow.com/questions/16990247/drag-and-drop-persistent-location
Drag n Drop in GridView
https://blahti.wordpress.com/2011/10/03/drag-drop-for-android-gridview/
Constrained Drop and Drag
https://github.com/rfreedman/android-constrained-drag-and-drop-view
Service and handler for long running asks
http://gradlewhy.ghost.io/a-service-and-a-handler-for-long-tasks/
MVC and MVP and MVVM
http://www.tothenew.com/blog/androidmvc-mvp-mvvm/
Good links these are during the POC which I was working for FCM registration , IAP and Uploading image to IAP
https://spring.io/guides/gs/rest-service/#scratch
https://dzone.com/articles/build-rest-web-service-using-spring
https://code.tutsplus.com/tutorials/android-from-scratch-using-rest-apis--cms-27117
https://androidjson.com/capture-image-camera-upload-server/
https://www.callicoder.com/spring-boot-file-upload-download-rest-api-example/
http://zetcode.com/springboot/uploadfile/
https://www.mkyong.com/spring-mvc/spring-mvc-file-upload-example/
https://www.mkyong.com/spring-boot/spring-boot-file-upload-example-ajax-and-rest/
https://stackoverflow.com/questions/37516589/send-push-notifications-from-server-with-fcm
https://medium.com/@srinuraop/sending-messages-from-app-server-to-clients-using-fcm-b2a471fc3e33
https://www.zoftino.com/sending-device-specific-push-notification-message-using-firebase-cloud-messaging
https://www.myflashlabs.com/send-fcm-messages-server/
https://dzone.com/articles/spring-boot-restful-web-service-complete-example
https://www.callicoder.com/spring-boot-file-upload-download-rest-api-example/
https://www.17od.com/2010/02/18/multipart-form-upload-on-android/
https://learnwithmehere.blogspot.com/2015/10/is-multipart-request-complicated-think.html
https://stackoverflow.com/questions/35839130/send-file-and-parameters-to-server-with-httpurlconnection-in-android-api-23
https://demonuts.com/upload-image-to-server-in-android-using-multipart-volley/
https://stackoverflow.com/questions/11766878/sending-files-using-post-with-httpurlconnection