相关疑难解决方法(0)

我在为RssReader运行我的Android项目时遇到错误.

码:

URL url = new URL(urlToRssFeed);
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser parser = factory.newSAXParser();
XMLReader xmlreader = parser.getXMLReader();
RssHandler theRSSHandler = new RssHandler();
xmlreader.setContentHandler(theRSSHandler);
InputSource is = new InputSource(url.openStream());
xmlreader.parse(is);
return theRSSHandler.getFeed();

它显示以下错误:

android.os.NetworkOnMainThreadException

我该如何解决这个问题？

这里我使用此代码加载Json.它与Android 2.2工作正常,但当我使用Android 4.2它抛出android.os.NetworkOnMainThreadException 异常请给我解决方案

 public class JSONParser {

    static InputStream is = null;

static JSONObject jObj = null;
static String json = "";

// constructor
public JSONParser() {

}

public JSONObject getJSONFromUrl(String url) {

    // Making HTTP request
    try {
        // defaultHttpClient
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpGet httpPost = new HttpGet(url);

            HttpResponse getResponse = httpClient.execute(httpPost);
           final int statusCode = getResponse.getStatusLine().getStatusCode();

           if (statusCode != HttpStatus.SC_OK) { 
              Log.w(getClass().getSimpleName(), 
                  "Error " + statusCode + " for URL " + url); 
              return …

我正在使用Rxjava2,

我flatmap在RxJava中使用以下结构:

Observable1.flatmap() 并返回Observable 2.

如下代码:

getApi().createUser(os, deviceToken)
            .compose(view.regisObserver())
            .subscribeOn(Schedulers.io())
            .flatMap(result -> {
                String user_token = result.data.user_token;
                getPreferenceStore().setAuthToken(user_token);

                setReadPolicy();

                Observable<ObjectDto<UserProfile>> obs = getApi().updateProfile(null, null, null);
                        obs.compose(view.regisObserver());

                return obs;
            })
            .subscribe(result-> {
                getPreferenceStore().setUserId(result.data.user_id);

            //                    view.onUpdateProfile();
            }, Throwable::printStackTrace);

@Override
public <T> ObservableTransformer<T, T> regisObserver() {
    return observable -> observable.compose(prepare())
            .doOnSubscribe(disposable -> showProgressDialog())
            .doOnComplete(this::closeProgressDialog)
            .doOnError(throwable -> {
                if (BuildConfig.DEBUG) {
                    throwable.printStackTrace();
                }
                showProgressDialog();
                closeProgressDialog();
            });

}

代码编译没有错误.它在运行时出错NetworkErrorOnMainThread.我不知道如何解决它.