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android - HttpResponse.getEntity() NetworkOnMainThreadException 异常

转载 作者：太空狗 更新时间：2023-10-29 13:33:05 26 4
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Possible Duplicate:
NetworkOnMainThreadException

很长一段时间以来，我一直在使用在 AsyncTask 中执行 http 请求的通用代码。 AsyncTask 返回一个 HttpResponse 对象。一切都很好，GUI 线程从未卡住或发生任何事情。

现在，突然间，这会创建一个 NetworkOnMainThreadException:

serverResponse.getEntity().getContent();

什么鬼？？为什么 getEntity() 被认为是网络？在我看来，该行仅将响应转换为输入流，不需要网络连接。这个决定是谁做的？为什么他们决定这应该是网络？

异步任务:

public class AsyncHttpTask extends AsyncTask<HttpRequestInfo, Integer, HttpRequestInfo> {

public AsyncHttpTask() {
    super();
}

protected HttpRequestInfo doInBackground(HttpRequestInfo... params) {
    HttpRequestInfo rinfo = params[0];
    try{
        HttpClient client = new DefaultHttpClient();
        HttpResponse resp = client.execute(rinfo.getRequest());
        rinfo.setResponse(resp);
    }
    catch (Exception e) {
        rinfo.setException(e);
    }
    return rinfo;
}

@Override
protected void onPostExecute(HttpRequestInfo rinfo) {
    super.onPostExecute(rinfo);
    rinfo.requestFinished();
}

回调接口(interface):

    public interface HttpCallback {

        public void onResponse(HttpResponse serverResponse);
        public void onError(Exception e);

    }

HttpRequestInfo:

public class HttpRequestInfo {

    private HttpUriRequest request_;
    private HttpCallback callback_;
    private Exception exception_;
    private HttpResponse response_;

    public HttpRequestInfo(HttpUriRequest request, HttpCallback callback) {
        super();
        request_ = request;
        callback_ = callback;
    }

    public HttpUriRequest getRequest() {
        return request_;
    }

    public void setRequest(HttpUriRequest request) {
        request_ = request;
    }

    public HttpCallback getCallback() {
        return callback_;
    }

    public void setCallback(HttpCallback callback) {
        callback_ = callback;
    }

    public Exception getException() {
        return exception_;
    }

    public void setException(Exception exception) {
        exception_ = exception;
    }

    public HttpResponse getResponse() {
        return response_;
    }

    public void setResponse(HttpResponse response) {
        response_ = response;
    }

    public void requestFinished(){
        if(exception_ != null){
            callback_.onError(exception_);
        }
        else {
            callback_.onResponse(response_);
        }
    }
}

然后我使用 jackson 将 json 响应转换为对象。这就是发生异常的地方:

@Override
public <T> T handleResponse(HttpResponse serverResponse, Class<T> typeOfResponse) {
    ObjectMapper mapper = new ObjectMapper();
    mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    T responseObject = null;
    try {
        responseObject = mapper.readValue(serverResponse.getEntity().getContent(),typeOfResponse); //THIS LINE IS EVIL
    } catch (JsonParseException e) {
        throw new ARException("Couldn't handle the response because the http response contained malformed json.",e);
    } catch (JsonMappingException e) {
        throw new ARException("Mapping the json response to the response object " + typeOfResponse + " failed.",e);
    } catch (IllegalStateException e) {
        throw new ARException("Couldn't convert the http response to an inputstream because of illegal state.",e);
    } catch (IOException e) {
        throw new ARException("Couldn't convert the http response to an inputstream.",e);
    }
    return responseObject;
}

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