Question

在我的应用程序中，我有一个列表，其中包含自定义项目列表，在适配器的背景中显示不同的项目加载我正试图用这个代码以增量方式（使用距离值）对适配器的元素进行排序。进入onCretaeView：

cardViewList = new ArrayList<>();
    View vw=inflater.inflate(R.layout.jsonparse_fragment, container, false);
    lv=(ListView) vw.findViewById(R.id.listView1);
    lv.setDivider(null);
    lv.setDividerHeight(0);

    final Double lat = gpsTracker.getLatitude();
    Double LatitudineUber = lat;
    Double lon = gpsTracker.getLongitude();
    Double LongitudineUber = lon;





    cardViewList.clear();

    if (flag_above35==1 && flag_below35==0 && flag_hybrid==0 && flag_position==0 && flag_tempo==0 && flag_conducente == 0)
    {
        car2go_flag=1;
        new JSONAsynTask().execute("https://www.car2go.com/api/v2.1/vehicles?loc="+nome_citta+"&oauth_consumer_key=roadzapp&format=json");
    }
    else if (flag_above35==0 && flag_below35==1 && flag_hybrid==0 && flag_position==0 && flag_tempo==0 && flag_conducente == 0)
    {
        car2go_flag=2;
        new JSONAsynTask().execute("https://www.car2go.com/api/v2.1/vehicles?loc="+nome_citta+"&oauth_consumer_key=roadzapp&format=json");
    }
    else if (flag_above35==1 && flag_below35==0 && flag_hybrid==1 && flag_position==0 && flag_tempo==0 && flag_conducente == 0)
    {
        car2go_flag=3;
        new JSONAsynTask().execute("https://www.car2go.com/api/v2.1/vehicles?loc="+nome_citta+"&oauth_consumer_key=roadzapp&format=json");
    }
    else if (flag_above35==0 && flag_below35==1 && flag_hybrid==1 && flag_position==0 && flag_tempo==0 && flag_conducente == 0)
    {
        car2go_flag=4;
        new JSONAsynTask().execute("https://www.car2go.com/api/v2.1/vehicles?loc="+nome_citta+"&oauth_consumer_key=roadzapp&format=json");
    }
    else if (flag_above35==0 && flag_below35==0 && flag_hybrid==1 && flag_position==0 && flag_tempo==0 && flag_conducente == 0)
    {
        car2go_flag=5;
        new JSONAsynTask().execute("https://www.car2go.com/api/v2.1/vehicles?loc="+nome_citta+"&oauth_consumer_key=roadzapp&format=json");
    }
    else if (flag_above35==0 && flag_below35==0 && flag_hybrid==0 && flag_position==0 && flag_tempo==0 && flag_conducente == 0)
    {
        car2go_flag=0;
        new JSONAsynTask().execute("https://www.car2go.com/api/v2.1/vehicles?loc="+nome_citta+"&oauth_consumer_key=roadzapp&format=json");
        if (flag_uber==1) {
            uber_flag=0;
            new JSONAsynTask1(getContext().getApplicationContext()).execute();
        }
        if (flag_jcd==1) {
            jcd_flag=0;
            //new JSONAsynTask2().execute();
            new JSONAsynTask3().execute();
        }
        if (flag_bitaksi==1) {
            bitaksi_flag=0;
            new JSONAsynTask4(getContext().getApplicationContext()).execute();
        }
        if (flag_lyft==1) {
            lyft_flag = 0;
            new JSONAsynTask5().execute();
        }
    }
    else if (flag_above35==0 && flag_below35==0 && flag_hybrid==0 && flag_position==1 && flag_tempo==0 && flag_conducente == 0)
    {
        car2go_flag=6;
        new JSONAsynTask().execute("https://www.car2go.com/api/v2.1/vehicles?loc="+nome_citta+"&oauth_consumer_key=roadzapp&format=json");
        if (flag_uber==1) {
            uber_flag=1;
            new JSONAsynTask1(getContext().getApplicationContext()).execute();
        }
        if (flag_jcd==1) {
            jcd_flag=1;
            //new JSONAsynTask2().execute();
            new JSONAsynTask3().execute();
        }
        if (flag_bitaksi==1) {
            bitaksi_flag=1;
            new JSONAsynTask4(getContext().getApplicationContext()).execute();
        }
        if (flag_lyft==1) {
            lyft_flag=1;
            new JSONAsynTask5().execute();
        }
    }
    else if (flag_above35==0 && flag_below35==0 && flag_hybrid==0 && flag_position==0 && flag_tempo==1 && flag_conducente == 0)
    {
        car2go_flag=7;
        new JSONAsynTask().execute("https://www.car2go.com/api/v2.1/vehicles?loc="+nome_citta+"&oauth_consumer_key=roadzapp&format=json");
        if (flag_uber==1) {
            uber_flag=2;
            new JSONAsynTask1(getContext().getApplicationContext()).execute();
        }
        if (flag_bitaksi==1) {
            bitaksi_flag=2;
            new JSONAsynTask4(getContext().getApplicationContext()).execute();
        }
        if (flag_lyft==1) {
            lyft_flag=2;
            new JSONAsynTask5().execute();
        }
    }
    else if (flag_above35==0 && flag_below35==0 && flag_hybrid==0 && flag_position==0 && flag_tempo==0 && flag_conducente == 1)
    {
        //car2go_flag=8;
        //new JSONAsynTask().execute("https://www.car2go.com/api/v2.1/vehicles?loc="+nome_citta+"&oauth_consumer_key=roadzapp&format=json");
        if (flag_uber==1) {
            uber_flag=1;
            new JSONAsynTask1(getContext().getApplicationContext()).execute();
        }
        if (flag_bitaksi==1) {
            bitaksi_flag=1;
            new JSONAsynTask4(getContext().getApplicationContext()).execute();
        }
        if (flag_lyft==1) {
            lyft_flag=1;
            new JSONAsynTask5().execute();
        }
    }

    adapter = new CardViewAdapter(getActivity(), R.layout.new_item_list, cardViewList);
    Collections.sort(cardViewList, new Comparator<CardView>() {
        @Override
        public int compare(CardView lhs, CardView rhs) {
            Double d1 = Double.parseDouble(lhs.getDistance()) / 1000.0;
            Double d2 = Double.parseDouble(rhs.getDistance()) / 1000.0;
            if (d1 == d2) {
                return 0;
            }
            if (d1 > d2) {
                return 1;
            }
            return -1;
        }
    });


    lv.setAdapter(adapter);

但排序不起作用。我的代码错了？有什么帮助吗？

Answer 1

您的cardviewlist正在被AsyncTask填充，因此在填充列表之前调用Collections.sort，因此没有任何内容可以排序。稍后，当AsyncTasks填充列表时，它们不会被排序。

Android按距离

1 个答案: