How to remove extra solid space between cards in cardview in android layout file

Simply remove linear layout in which cardview is enclosed.
Your xml fie structure should be like.. cardview-->relative layout-->components.

updating jdk in android studio takes long time to Gradle sync.

Upgrade Android Studio 2.1 Preview3 : Cannot configure the 'publishing' extension after it has been accessed

 I was using volley and in build.gradle (volley) after commenting out apply from: 'bintray.gradle' , it worked !!

How to install Intel HAXM for emulation in Android Studio

To install the Intel HAXM kernel extension: Start the Android SDK Manager, select Extras and then select Intel Hardware Accelerated Execution Manager.

How to add loading gif image in android app using Glide

Follow this link
http://stackoverflow.com/questions/31082330/show-gif-file-with-glide-image-loading-and-caching-library

Refresh activity to update results or List items?

Simply write  'onCreate(null);' at the end of function. 

Run Configurations disabled in Android Studio

go to the combo just to the left of the run button, open it and select the main module of your project. It should be enough to enable run button again.

Cheers.