Android 在DialogFragment中更改布局时发生IllegalStateException

当我做一些布局更改时，我在DialogFragment中的一些设备上得到一个非法状态异常。在我的DialogFragment中，我通过截取从JSON获取一些数据，当出现ResponseError时，我想更改一些视图。例如，这是我的视图更改方法：

private void showErrorLayout() {
        mProgressBar.setVisibility(View.INVISIBLE);
        mText.setVisibility(View.VISIBLE);
        mText.setText(getString(R.string.volley_firmware_update_error));
}

这是我截击的方法：

private void checkVersionNetwork() {
    final int fw = sharedPreferencesManager.loadFirmwareVersion();
        JsonObjectRequest request = new JsonObjectRequest(
                Request.Method.GET, JSON_LINK, null, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                try {
                    JSONObject object = response.getJSONObject(OBJECT);
                    JSONObject changelogObject = response.getJSONObject(CHANGELOG_OBJECT);

                    if (fw >= Integer.parseInt(object.getString(JSON_FIRMWARE_VERSION))) {
                        Log.i(LOG_TAG, "onResponse: FIRMWARE IS UP TO DATE");
                        mText.setText(R.string.firmware_most_recent);
                        mButton.setText(R.string.sb_ok);
                        btnClose.setVisibility(View.INVISIBLE);
                        mText.setVisibility(View.VISIBLE);
                        mButton.setVisibility(View.VISIBLE);
                        mProgressBar.setVisibility(View.INVISIBLE);

                    } else {
                        Log.i(LOG_TAG, "onResponse: FIRMWARE IS OUT OF DATE");

                        if (Locale.getDefault().getLanguage().equals("en")) {
                            mText.setText(getString(R.string.firmware_need_download) + "\n" + getString(R.string.changes) + "\n" + changelogObject.getString(JSON_FIRMWARE_CHANGELOG_TEXT_ENG));
                        } else if (Locale.getDefault().getLanguage().equals("de")) {
                            mText.setText(getString(R.string.firmware_need_download) + "\n" + getString(R.string.changes) + "\n"  + changelogObject.getString(JSON_FIRMWARE_CHANGELOG_TEXT_GER));
                        }
                        mText.setVisibility(View.VISIBLE);
                        mButton.setVisibility(View.VISIBLE);
                        mProgressBar.setVisibility(View.INVISIBLE);
                        downloadLink = object.getString("url");
                        Log.i(LOG_TAG, "onResponse: " + downloadLink);
                        mButton.setText(getContext().getResources().getString(R.string.download));
                    }
                    Log.i("RESPONSE", object.getString(JSON_FIRMWARE_VERSION));
                } catch (JSONException | NullPointerException e) {
                    e.printStackTrace();
                    showErrorLayout();
                }
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.e("VOLLEY", error.toString());
                showErrorLayout();
            }
        }
        );

        mRequestQueue.add(request);
    //}
}

---

HTTP请求完成后，调用onResponse或onError，它们在主线程上工作，而不知道活动是否仍在前台。如果用户导航到其他位置时活动消失，getActivity将返回null，并检查DialogFragment是否已添加

此行出错，请尝试此操作

if(getActivity()!=null && isAdded()) {
    mText.setText(getActivity().getResources().getString(R.string.volley_firmware_update_error));
}

if(getActivity()!=null && isAdded()) {
    mText.setText(getActivity().getResources().getString(R.string.volley_firmware_update_error));
}