How to create google map release Key -Android

I was recently working on maps after a very long time and found i was stuck creating release key for google map , i was stuck for nearly one and half hour , then it was simple , Here it is how it works

1. Initially you would be creating apps with debug key which wont work in the app store

2. so wat you do is very simple 

3. Export your app and create a intial apk with the debug key 

4. Then wat u do is simple go to 

5. once again you try to export with the previous key store generated before with debug key , then go go to the final dialog box where you export so u will be getting the SHA1 key 

6.Using the SHA1 key go to the developer console and generate your API KEY for the app your are going to put in app store

thats it 

enjoy