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求助:一个加载顺序的问题

程序员文章站 2022-06-05 08:51:45
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我在做一个APP的用户列表绑定数据,我用测试数据进行绑定的时候是没有问题的,我一换上接口数据就会出现一个问题,就是他总是先进行了绑定数据的操作再去做获取数据的操作,就是说我第一次进入页面,绑定的数据为空,但是集合中获取到的是第一页的数据,然后上拉加载第二页的时候就绑定了第一页的数据,集合中获取到了两页的数据,Activity代码如下:
public class MypersonActivity extends BaseActivity{
    private ListView listView;
    private PtrClassicFrameLayout ptrClassicFrameLayout;
    private PersonAdapter personAdapter;
    private List<PersonBean> valueList = new ArrayList<>();

    private int pages = 0;
    private boolean isAll;

    @Override
    protected int setLayout() {
        return R.layout.activity_myperson;
    }

    @Override
    protected void initView() {
        enableTitleDelegate();
        getTitleDelegate().setTitle("我的用户");

        listView = getViewById(R.id.person_listview);

        //下拉框架
        ptrClassicFrameLayout = getViewById(R.id.person_ptrclassicframelayout);

        ptrClassicFrameLayout.setLastUpdateTimeRelateObject(this);
        ptrClassicFrameLayout.setResistance(1.7f);
        ptrClassicFrameLayout.setRatioOfHeaderHeightToRefresh(1.2f);
        ptrClassicFrameLayout.setDurationToClose(200);
        ptrClassicFrameLayout.setDurationToCloseHeader(1000);
        ptrClassicFrameLayout.setPullToRefresh(false);
        ptrClassicFrameLayout.setKeepHeaderWhenRefresh(true);

        ptrClassicFrameLayout.setPtrHandler(new PtrDefaultHandler2() {
            @Override
            public void onLoadMoreBegin(PtrFrameLayout frame) {
                pages++;
                if (!isAll) {
                    requestData();
                } else {
                    ptrClassicFrameLayout.refreshComplete();
                }
            }

            @Override
            public void onRefreshBegin(PtrFrameLayout frame) {
                isAll = false;
                valueList.clear();
                pages = 1;
                requestData();
            }
        });

        personAdapter = new PersonAdapter(mContext, valueList);
        requestData();

    }

    private void requestData() {
        //接口数据
        String token= PreferencesHelper.find("token","");
        RequestUtils.getPersons(token, pages, 4, new HttpCallBack<String>(mContext) {
            @Override
            protected void onSuccess(Call call, Response response, String s) {
                try {
                    JSONObject jsonObject= new JSONObject(s);
                    JSONArray jsonArray= (JSONArray) jsonObject.get("data");
                    for(int i=0;i<jsonArray.length();i++){
                        JSONObject json= (JSONObject) jsonArray.get(i);
                        PersonBean personBean=new PersonBean();
                        personBean.setImg(R.mipmap.icon_person);
                        personBean.setName((String) json.get("login_name"));
                        valueList.add(personBean);
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }

            @Override
            protected void onEror(Call call, int statusCode, String message) {

            }
        });
//        测试数据
//        PersonBean personBean1 = new PersonBean();
//        personBean1.setImg(R.mipmap.icon_person);
//        personBean1.setName("张三");
//
//        PersonBean personBean2 = new PersonBean();
//        personBean2.setImg(R.mipmap.icon_person);
//        personBean2.setName("李四");
//
//        PersonBean personBean3 = new PersonBean();
//        personBean3.setImg(R.mipmap.icon_person);
//        personBean3.setName("王五");
//
//        valueList.add(personBean1);
//        valueList.add(personBean2);
//        valueList.add(personBean3);



        personAdapter.setValueList(valueList);
        listView.setAdapter(personAdapter);
        ptrClassicFrameLayout.refreshComplete();
    }



    @Override
    protected void windowsDidloaded() {

    }
PersonAdapter适配器代码如下:
public class PersonAdapter extends BaseAdapter {

    private List<PersonBean> valueList;
    private Context context;
    private LayoutInflater layoutInflater;

    public PersonAdapter(Context context, List<PersonBean> valueList) {
        this.valueList = valueList;
        this.context = context;
        layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    public List<PersonBean> getValueList() {
        return valueList;
    }

    public void setValueList(List<PersonBean> valueList) {
        this.valueList = valueList;
    }

    @Override
    public int getCount() {
        return valueList.size();
    }

    @Override
    public Object getItem(int i) {
        return valueList.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        final ViewHolder holder;
        if (convertView == null) {
            convertView = layoutInflater.inflate(R.layout.adapter_persons, parent, false);
            holder = new ViewHolder();
            holder.personName = (TextView) convertView.findViewById(R.id.person_tv);
            holder.personImg = (ImageView) convertView.findViewById(R.id.person_img);

            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        final PersonBean item = valueList.get(position);
        holder.personImg.setImageResource(item.getImg());
        holder.personName.setText(item.getName());
        return convertView;
    }

    static class ViewHolder {
        private TextView personName;
        private ImageView personImg;

    }
我认为可能是异步加载的原因导致方法的执行顺序有问题,下面是异步加载的代码:
//去进行网络 异步 请求
    public void doRequest(Request request, boolean isShowAlert, String alertTitle, final BaseCallBack callBack) {
        if (isShowAlert) {
            callBack.OnRequestBefore(request, alertTitle);
        }
        okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                callBackFailure(callBack, call, e);
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                callBack.onResponse(response);
                String result = response.body().string();
                if (CheckUtils.isAvailable(result)) {
                    LogUtil.e(result);
                }
                if (response.isSuccessful()) {
                    try {
                        JSONObject jsonObject = new JSONObject(result);
                        if (jsonObject.getInt("code") != 0) {
                            callBackError(callBack, call, response.code(), jsonObject.getString("message"));
                            return;
                        }
                        if (callBack.mType == String.class) {
//                        callBack.onSuccess(call, response, result);
                            callBackSuccess(callBack, call, response, result);
                        } else {
                            String data = jsonObject.getString("data");
                            Object object = JSON.parseObject(data, callBack.mType);//自动转化为 泛型对象
//                            callBack.onSuccess(call, response, object);
                            callBackSuccess(callBack, call, response, object);
                        }
                    } catch (JSONException e) {
                        e.printStackTrace();
                        callBackError(callBack, call, response.code(), "数据转换异常");
                    }
                } else{
                    callBackError(callBack, call, response.code(), response.message());
                }

            }

        });
    }
求各位大佬帮帮忙,感谢!!!