无法在未调用looper.prepare异常的线程内创建处理程序

时间:2012-05-18 22:59:54

标签: android json apache android-asynctask

首先,让我解释一下,我很清楚这个例外的含义,如果您要回答,请仔细阅读问题。

我知道当您尝试在网络线程上执行UI工作时会出现异常。我正在使用AsyncTask,但我正在进行任何UI操作。

以下是AsyncTask代码中引发错误的代码段 注意事先声明aps和adm 它在Extracter初始化中抛出了异常:

    do{
            try{

                HttpPost request = new HttpPost(params[0]);
                request.setHeader("Accept", "application/json");
                request.setHeader("Content-type", "application/json");
                aps.setLastSent(lastSent);
                StringEntity filterEntity = new StringEntity(aps.TempParameter()); //Remember this TempParameter is temporary function
                request.setEntity(filterEntity);
                response = httpClient.execute(request);
                StatusLine statusLine = response.getStatusLine();
                if(statusLine.getStatusCode() == HttpStatus.SC_OK){
                    Extracter extracter = new Extracter(response);
                    lastSent = extracter.extractLastSent();
                    adm.addDictionary(extracter.extractDictionary());
                }
            } catch (ClientProtocolException e) {
                //TODO Handle problems..
                builder.append("Client protocol exception");
            } catch (IOException e) {
                //TODO Handle problems..
                builder.append(e.toString());
            }
        }while(lastSent != "done");

            return adm.getAlarmObjectList();

该行

    Extracter extracter = new Extracter(response);

是引发异常的地方。 以下是Extracter类的代码:

    public class Extracter extends AlarmLoopTestActivity {



private JSONObject jo;
private JSONArray ja;

public Extracter(HttpResponse response){
    StringBuilder builder = new StringBuilder();
    HttpEntity entity = response.getEntity();
    try {
        InputStream content = entity.getContent();
        BufferedReader reader = new BufferedReader(new InputStreamReader(content));
        String line;
        while((line = reader.readLine())!= null){
            builder.append(line);
        }
    } catch (IllegalStateException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    String json = builder.toString();
    try {
        jo = (JSONObject) new JSONTokener(json).nextValue();
        ja = jo.getJSONArray("effectNamesDict");
    } catch (JSONException e) {
        jo = null;
        e.printStackTrace();
    }

}

我假设printingStackTrace不被视为UI事件。除此之外,我不知所措。我需要重新审视这个问题。如果我需要进一步详细说明,请告诉我。

1 个答案:

答案 0 :(得分:0)

你的Extracter正在扩展一个类AlarmLoopTestActivity来自名称这是一个Android活动,因此它可能有一些UI交互方法!