Android Robolectric test example in Android Studio (link)

http://www.peterfriese.de/android-testing-with-robolectric/

Practice your shell skills (link)

http://explainshell.com

How to hide action bar before activity is created (link)

I had to solve somehow the issue when default actionbar is shown right before I've to inflate the custom view for it. I've found this link with good explanation how to fix it.

http://stackoverflow.com/questions/8500283/how-to-hide-action-bar-before-activity-is-created-and-then-show-it-again

Android - Shaders explanation

https://sriramramani.wordpress.com/2012/12/21/shaders/

Android shapes tutorial (link)

http://www.b2creativedesigns.com/shapes.php#2.4

Android - a good tutorial of AsyncTask (link)

http://startandroid.ru/ru/uroki/vse-uroki-spiskom/151-urok-88-asynctask-itogovyj-rezultat-metod-get

Android: prevent display from turning off

http://stackoverflow.com/questions/10165108/android-prevent-display-from-turning-off

Android: Proof that findViewById() is slower than using a ViewHolder

http://www.blackmoonit.com/2011/06/proof-findviewbyid-slower-than-viewholder/

Android - How to apply color filter over ImageView component (link)

http://stackoverflow.com/questions/8193447/i-want-to-add-a-color-filter-to-the-imageview

If you want to use your predefined colours get them this way e.g. :

v.setColorFilter(getResources().getColor(R.color.green), PorterDuff.Mode.SRC_ATOP);

Android - How to apply borders to ImageView component (link)

1http://stackoverflow.com/questions/5841128/how-to-display-border-to-imageview