Getting Google YouTube API key

You should follow steps in here:
https://developers.google.com/youtube/android/player/register

with small exception since the command returns error:

$ keytool -list -v my-release-key.keystore
keytool error: java.lang.RuntimeException: Usage error, /Users/uki/Documents/Dropbox/Android_Keychains/my-release-key.keystore is not a legal command
java.lang.RuntimeException: Usage error, /Users/uki/Documents/Dropbox/Android_Keychains/my-release-key.keystore is not a legal command
    at sun.security.tools.KeyTool.parseArgs(KeyTool.java:375)
    at sun.security.tools.KeyTool.run(KeyTool.java:171)
    at sun.security.tools.KeyTool.main(KeyTool.java:166)

instead use the following:

$ keytool -list -v -keystore "my-release-key.keystore"
Enter keystore password:  

• Make sure you use option -v to get both SHA1 and MP5
• Make sure you quote the file path to your keystore file.