gistfile1.txt

  private void printKeyHash() {
    try {
      PackageInfo info = getPackageManager().getPackageInfo(getPackageName(), 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) {
      Log.d("KeyHash:", e.toString());
    } catch (NoSuchAlgorithmException e) {
      Log.d("KeyHash:", e.toString());
    }
  }