SHA

SHA1-certificate-ingerprint

try {
  PackageInfo info = getPackageManager().getPackageInfo("com.xxx.yyy", PackageManager.GET_SIGNATURES);
    for (Signature signature : info.signatures) {
      MessageDigest md = MessageDigest.getInstance("SHA");
      md.update(signature.toByteArray());
      Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
    }
  } catch (PackageManager.NameNotFoundException e) {
} catch (NoSuchAlgorithmException e) {
}