import org.threeten.bp.ZoneId;
import org.threeten.bp.ZonedDateTime;

// 現在時刻
ZonedDateTime now = ZonedDateTime.now();
// 任意の日付
ZonedDateTime target = ZonedDateTime.of(2021, 04, 01, 0, 0, 0, 0, ZoneId.systemDefault());
if (now.compareTo(target_date) < 0) {
  // targetが未来日付の場合はここに入る！
}

Call<ResponseBody> call = client.hoge();
Response<ResponseBody> response = call.execute();
if (response.isSuccessful()) {
    response.body().close();
} else {
    List<String> list = getErrorMessages(response.errorBody().string());
    Objects.requireNonNull(getActivity()).runOnUiThread(() -> Toast.makeText(getContext(), list.get(0), Toast.LENGTH_LONG).show());
}

/**
  * APIのエラーレスポンスからmessagesを取り出してListとして返す
  */
public static List<String> getErrorMessages(String errorBody) throws JSONException {
    JSONObject errorJson = new JSONObject(errorBody);
    String s = errorJson.getString("messages");
    s = s.replace("[", "").replace("]", "");
    String[] split = s.split(",");
    return Arrays.asList(split);
}

/**
 * テキストにハイパーリンクを設定する
 */
TextView textView = root.findViewById(R.id.hoge);
String link_text = "こちら";
String link_url = "https://hoge.com";
addHyperLink(textView, link_text, link_url, this);

/**
 * テキストにハイパーリンクを設定する関数
 */
public static void addHyperLink(TextView textView, String link_text, String link_url, Fragment fragment) {
    Map<String, String> map = new HashMap<>();
    map.put(link_text, link_url);
    SpannableString ss = MiscUtils.createSpannableString(textView.getText().toString(), map, fragment);
    textView.setText(ss);
    textView.setMovementMethod(LinkMovementMethod.getInstance());
}

/**
 * 内部関数
 */
private static SpannableString createSpannableString(String message, Map<String, String> map, Fragment fragment) {

    SpannableString ss = new SpannableString(message);

    for (final Map.Entry<String, String> entry : map.entrySet()) {
        int start = 0;
        int end = 0;

        // リンク化対象の文字列の start, end を算出する
        Pattern pattern = Pattern.compile(entry.getKey());
        Matcher matcher = pattern.matcher(message);
        while (matcher.find()) {
            start = matcher.start();
            end = matcher.end();
            break;
        }

        // SpannableString にクリックイベント、パラメータをセットする
        ss.setSpan(new ClickableSpan() {
            @Override
            public void onClick(View textView) {
                String url = entry.getValue();
                Uri uri = Uri.parse(url);
                Intent intent = new Intent(Intent.ACTION_VIEW, uri);
                fragment.startActivity(intent);
            }
        }, start, end, Spanned.SPAN_INCLUSIVE_INCLUSIVE);
    }

    return ss;
}

ExecutorService executor = Executors.newSingleThreadExecutor();
executor.execute(() -> {
  Toast.makeText(getContext(), "エラーメッセージ", Toast.LENGTH_LONG).show()
});

final Handler handler = new Handler();
ExecutorService executor = Executors.newSingleThreadExecutor();
executor.execute(() -> {
  handler.post(() -> {
    Toast.makeText(getContext(), "エラーメッセージ", Toast.LENGTH_LONG).show()
  });
});

public class HogeFragment extends BaseFragment implements AdapterView.OnItemSelectedListener {

    public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) {
        spinner.setFocusable(false);
    })

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        // 画面表示時にonItemSelectedが呼ばれちゃう対処法
        Spinner spinner = mRoot.findViewById(R.id.spinner_id);
        if (!spinner.isFocusable()) {
            spinner.setFocusable(true);
            return;
        }
    }
  }

// 拡大対象のImageViewにタップ時のリスナーをセット
mImageView.setOnClickListener(v -> {
    SubsamplingScaleImageView imageViewEnlarged = new SubsamplingScaleImageView(getContext());
    Bitmap bitmap = ((BitmapDrawable) mImageView.getDrawable()).getBitmap();
    imageViewEnlarged.setImage(ImageSource.bitmap(bitmap));
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setView(imageViewEnlarged);
    builder.setNegativeButton(R.string.label_close, null);
    builder.show();
});