问题描述

一个空指针异常问题，求大神帮忙解决下，在线等

public void getQaList(String type, String qid, String qid_min,
        String cat_id, String tag_id, String page, String qid_top,
        boolean isShowLoadingDialog) {
    List<RequestParameter> parameter = new ArrayList<RequestParameter>();
        parameter.add(new RequestParameter("type", type));
        parameter.add(new RequestParameter("qid", qid));
        parameter.add(new RequestParameter("qid_min", qid_min));
        parameter.add(new RequestParameter("cat_id", cat_id));
        parameter.add(new RequestParameter("tag_id", tag_id));
        parameter.add(new RequestParameter("page", page));
        parameter.add(new RequestParameter("qid_top", qid_top));

（空指针异常）

        startHttpRequest(Constants.HTTP_POST, Constants.QA_LIST_Q_1_4,
            parameter, isShowLoadingDialog, Constants.LOADING_CONTENTS,
            true, Constants.CONNECTION_SHORT_TIMEOUT,
            Constants.READ_MIDDLE_TIMEOUT, LOAD_QUESTION_KEY);
}

跳转到

protected void startHttpRequst(String requestType, String url,
List parameter, boolean isShowLoadingDialog,
String loadingDialogContent, boolean isHideCloseBtn,
int connectTimeout, int readTimeout) {
startHttpRequest(requestType, url, parameter, isShowLoadingDialog,
loadingDialogContent, isHideCloseBtn, connectTimeout,
readTimeout, -1);
}

protected void startHttpRequest(String requestType, String url,
                                List<RequestParameter> parameter, boolean isShowLoadingDialog,
                                String loadingDialogContent, boolean isHideCloseBtn,
                                int connectTimeout, int readTimeout, int resultCode) {
    startHttpRequest(null, requestType, url, parameter,
            isShowLoadingDialog, loadingDialogContent, isHideCloseBtn,
            connectTimeout, readTimeout, resultCode);
}

protected void startHttpRequest(File file, String requestType, String url,
                                List<RequestParameter> parameter, boolean isShowLoadingDialog,
                                String loadingDialogContent, boolean isHideCloseBtn,
                                int connectTimeout, int readTimeout, int resultCode) {
    if (isShowLoadingDialog) {
        if (!CheckNetWorkUtil.netWorkIsAvailable(getActivity())) {
            return;
        }
    }
    if (null != parameter) {
        FragmentActivity activity = getActivity();
        if (activity != null) {
            parameter.add(new RequestParameter("appver", DeviceUtil
                    .getVersionName(activity)));
            parameter.add(new RequestParameter("ver", DeviceUtil
                    .getVersionName(getActivity())));
        }
        parameter.add(new RequestParameter("width",
                MyApplication.screenWidth));
        parameter.add(new RequestParameter("height",
                MyApplication.screenHeight));
        parameter.add(new RequestParameter("device", Constants.DEVICE));
        parameter.add(new RequestParameter("devname",
                MyApplication.manufacturer));
        parameter.add(new RequestParameter("sysver", MyApplication.sysver));
        parameter.add(new RequestParameter("system", Constants.DEVICE));

        parameter.add(new RequestParameter("source", Constants.DEVICE));
        parameter.add(new RequestParameter("imei", Constants.HWID));
    }

    LogUtil.d("requestUrl", url);
    for (int i = 0; i < parameter.size(); i++) {
        RequestParameter requestParameter = parameter.get(i);

// LogUtil.d("requestParameter", requestParameter.getName() + "="
// + requestParameter.getValue());
}
BaseRequest httpRequest = null;
if ("POST".equalsIgnoreCase(requestType)) {
httpRequest = new AsyncHttpPost(file, getActivity(), this, url,
parameter, isShowLoadingDialog, loadingDialogContent,
isHideCloseBtn, connectTimeout, readTimeout, resultCode);
} else {
httpRequest = new AsyncHttpGet(getActivity(), this, url, parameter,
isShowLoadingDialog, loadingDialogContent, isHideCloseBtn,
connectTimeout, readTimeout, resultCode);
}
DefaultThreadPool.getInstance().execute(httpRequest);

this.requestList.add(httpRequest);

}

解决方案

求大神帮忙解决一个网络设备互联的考试题，谢谢啦。
急求大神帮忙解决的问题

解决方案二：

是不是PagerAdapter