如何在android应用程序中根据国家更改区域？

我有两个微调器。一个位于代表国家的工具栏上，另一个位于代表区域的片段上。我正在从服务器获取数据。当我选择国家时，我想这样做，特定区域显示在区域微调器中

这是我的json数据

    {
      "Status": 1,
      "StatusMessage": "Country and Country Area List",
      "data": [
        {
          "CountryID": "1",
          "CountryName": "India",
          "CountryArea": [
            {
              "CountryID": "1",
              "AreaID": "1",
              "AreaName": "Kuwait City(Capital)"
            },
            {
              "CountryID": "1",
              "AreaID": "2",
              "AreaName": " Hawally"
            },
            {
              "CountryID": "1",
              "AreaID": "3",
              "AreaName": "Farwaniya"
            },
            {
              "CountryID": "1",
              "AreaID": "4",
              "AreaName": "  Ahmadi"
            },
            {
              "CountryID": "1",
              "AreaID": "5",
              "AreaName": " Jahra"
            }
          ]
        },
        {
          "CountryID": "2",
          "CountryName": "Dubai",
          "CountryArea": [
            {
              "CountryID": "2",
              "AreaID": "6",
              "AreaName": " Jeddah"
            },
            {
              "CountryID": "2",
              "AreaID": "7",
              "AreaName": " Riyadh"
            },
            {
              "CountryID": "2",
              "AreaID": "8",
              "AreaName": " Khobar"
            },
            {
              "CountryID": "2",
              "AreaID": "9",
              "AreaName": " Abha"
            },
            {
              "CountryID": "2",
              "AreaID": "10",
              "AreaName": " Abqiq"
            },
            {
              "CountryID": "2",
              "AreaID": "11",
              "AreaName": " Abu Arish"
            },
            {
              "CountryID": "2",
              "AreaID": "12",
              "AreaName": " Al Ahsa"
            },
            {
              "CountryID": "2",
              "AreaID": "13",
              "AreaName": " Al Baha"
            },
            {
              "CountryID": "2",
              "AreaID": "14",
              "AreaName": " Al Dhahran"
            },
            {
              "CountryID": "2",
              "AreaID": "15",
              "AreaName": " Al Jubail"
            },
            {
              "CountryID": "2",
              "AreaID": "16",
              "AreaName": " Al Kharj"
            },
            {
              "CountryID": "2",
              "AreaID": "17",
              "AreaName": " Al Madina El Monawara"
            },
            {
              "CountryID": "2",
              "AreaID": "18",
              "AreaName": " Al Qatif"
            },
            {
              "CountryID": "2",
              "AreaID": "19",
              "AreaName": " Al Taif"
            },
            {
              "CountryID": "2",
              "AreaID": "20",
              "AreaName": " Almadnab"
            },
            {
              "CountryID": "2",
              "AreaID": "21",
              "AreaName": " Bisha"
            },
            {
              "CountryID": "2",
              "AreaID": "22",
              "AreaName": " Buraida"
            },
            {
              "CountryID": "2",
              "AreaID": "23",
              "AreaName": " Dawadmy"
            },
            {
              "CountryID": "2",
              "AreaID": "24",
              "AreaName": " Hafr Elbatin"
            },
            {
              "CountryID": "2",
              "AreaID": "25",
              "AreaName": " Hail "
            },
            {
              "CountryID": "2",
              "AreaID": "26",
              "AreaName": " Jazan"
            },
            {
              "CountryID": "2",
              "AreaID": "27",
              "AreaName": " Mecca"
            },
            {
              "CountryID": "2",
              "AreaID": "28",
              "AreaName": " Oniza"
            },
            {
              "CountryID": "2",
              "AreaID": "29",
              "AreaName": " Qurayat"
            },
            {
              "CountryID": "2",
              "AreaID": "30",
              "AreaName": " Zulfi"
            },
            {
              "CountryID": "2",
              "AreaID": "31",
              "AreaName": "Dammam"
            }
          ]
        }
      ]
    }

这是my CountryAdpter，位于工具栏上：

 @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.menu, menu);
        super.onCreateOptionsMenu(menu, inflater);
        this.menu = menu;
        MenuItem menuItem = menu.findItem(R.id.menu_spinner).setVisible(true);
        mCountrySpinner = (Spinner) MenuItemCompat.getActionView(menuItem);


        countryAdapter = new ArrayAdapter<String>(getContext(), android.R.layout.simple_spinner_dropdown_item, mCountryList);
        countryAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        mCountrySpinner.setAdapter(countryAdapter);

        mCountrySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                countryId = getCountryId.get(position);
                Log.e("countryid", countryId);


            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });


    }

@覆盖
创建选项菜单（菜单菜单，菜单充气机）{
充气机。充气（右菜单，菜单）；
super.onCreateOptions菜单（菜单，充气机）；
this.menu=菜单；
MenuItem MenuItem=menu.findItem（R.id.menu\u微调器）.setVisible（true）；
mCountrySpinner=（微调器）MenuItemCompat.getActionView（menuItem）；
countryAdapter=newArrayAdapter（getContext（），android.R.layout.simple\u微调器\u下拉菜单\u项，mCountryList）；
countryAdapter.setDropDownViewResource（android.R.layout.simple\u微调器\u下拉菜单\u项）；
mCountrySpinner.setAdapter（countryAdapter）；
mCountrySpinner.setOnItemSelectedListener（新的AdapterView.OnItemSelectedListener（）{
@凌驾
已选择公共视图（AdapterView父视图、视图视图、整型位置、长id）{
countryId=getCountryId.get（位置）；
Log.e（“countryid”，countryid）；
}
@凌驾
未选择公共无效（AdapterView父级）{
}
});
}

我将概述以正确方式构建数据所需的一般步骤

1st.您需要解析给定的JSON。我强烈建议使用像GSON这样的库。它很容易使用，而且非常有用。要使用GSON通过它，您必须创建至少两个类-Country和CountryArea。类Country应该有CountryArea对象的列表。确保变量名mach完全来自JSON的对应键，或者使用GSON的SerializedName属性

---

2nd.当您点击ONIMSELECTED时，以与填充第一个微调器相同的方式填充第二个微调器，但是这次是针对相应的国家/地区。

你的微调器代码在哪里？我已经建议OP使用

countryAdapter=new ArrayAdapter

而不是

countryAdapter=new ArrayAdapter

，但他只是忽略了这一点，所以可能使用GSON和这两个POJO类不会被HIM接受。我接受了你的答案，但我不知道如何使用这个过程。我制作了Country class并将数据保存在其中。但是没有变化。@pskink