I got my Answer, it was quit simple.
Open Terminal,
Type command:
keytool -list -v -keystore ~/.android/debug.keystore -alias androiddebugkey -storepass android -keypass android
Press Enter: You will get the following info, and SHA1 can be seen there.
…..
Certificate fingerprints:
MD5: 79:F5:59:................FE:09:D1:EC
SHA1: 33:57:0A:C9:..................:91:47:14:CD
SHA256: 39:AA:23:88:D6:...................33:DF:61:24:CB:17:47:EA:39:94:99
…….