Use for SDK : KeyHash

getkeyhash.java

  try {
      PackageInfo info = getPackageManager().getPackageInfo("myandroid.package.name", PackageManager.GET_SIGNATURES);
      for (Signature signature : info.signatures) {
          MessageDigest md = MessageDigest.getInstance("SHA");
          md.update(signature.toByteArray());
          DebugLogger.d("==============================");
          DebugLogger.d("KeyHash:" + Base64.encodeToString(md.digest(), Base64.DEFAULT));
          DebugLogger.d("==============================");
      }
  } catch (PackageManager.NameNotFoundException e) {
      e.printStackTrace();
  } catch (NoSuchAlgorithmException e) {
      e.printStackTrace();
  }