Java 选择状态微调器后填充城市微调器

这是我的问题:

我如何有两个微调器“State”和“City”，但城市将是空的，直到用户首先选择一个状态

我正在使用json数据动态构建微调器，您将在下面的代码中看到，一旦状态微调器值为！=0然后我使用状态微调器的项值，并为我的城市执行另一个数据库调用

我唯一的错误是在创建新的ArrayAdapter以保存城市数据时显示。我讨厌发布我所有的活动代码，但不确定我的问题在哪里

public class SearchActivity extends Activity{
    private static final String TAG = "MyApp";
      @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.search_layout);

           final Spinner zipspinner = (Spinner) findViewById(R.id.zipspinner);
           final Spinner cityspinner = (Spinner) findViewById(R.id.cityspinner);        

            JSONArray jsonArray;
            final JSONArray cityArray;

            try {
//GET STATE VALUES FROM DATACALL (DATABASE)
                String spinnerContentType = "state";
                String spinnerURL = "getStoreState.php";
                String spinner_data =  DataCall.getJSON(spinnerURL,spinnerContentType); 

                jsonArray = new JSONArray(spinner_data);

                final String[] array_spinner = new String[jsonArray.length()]; 


                for (int i=0; i<jsonArray.length(); i++)
                {



                    String styleValue = jsonArray.getJSONArray(i).getString(0); 

                    array_spinner[i] = styleValue;

                }
    //ADD STATE VALUES TO SPINNER           
                ArrayAdapter<String> adapter = 
                    new ArrayAdapter<String> (this, 
                            android.R.layout.simple_spinner_item,array_spinner);

                adapter.setDropDownViewResource(R.layout.state_spinner_layout);
                zipspinner.setAdapter(adapter);

                zipspinner.setOnItemSelectedListener(new OnItemSelectedListener() {

                    public void onItemSelected(AdapterView<?> arg0, View arg1,
                            int arg2, long arg3) {


                        int item = zipspinner.getSelectedItemPosition();

            //IF ITEM IN STATE IS SELECTED NOW GET CITIES FROM DATABALL         
                        if(item != 0){



                            try {
                                String item_value = array_spinner[item];
                                String spinnerContentType = "city";
                                String spinnerURL = "getStoreCity.php?state=" + item_value;
                                String city_data =  DataCall.getJSON(spinnerURL,spinnerContentType); 

                                cityArray = new JSONArray(city_data);

                                final String[] city_spinner = new String[cityArray.length()]; 


                                for (int i=0; i<cityArray.length(); i++)
                                {                       
                                    String styleValue = cityArray.getJSONArray(i).getString(0);                 
                                    city_spinner[i] = styleValue;                               
                                }
                    //THIS IS WHERE MY ISSUE IS TRYING TO ADD THE CITIES TO THEIR SPNNER            
                                ArrayAdapter<String> adapter2 = 
                                    new ArrayAdapter<String> (this, 
                                            android.R.layout.simple_spinner_item,city_spinner);

                                adapter2.setDropDownViewResource(R.layout.city_spinner_layout);

                                cityspinner.setAdapter(adapter2);

                                cityspinner.setOnItemSelectedListener(new OnItemSelectedListener() {

                                    public void onItemSelected(AdapterView<?> arg0, View arg1,
                                            int arg2, long arg3) {
                                        int item = cityspinner.getSelectedItemPosition();


                                        if(item != 0){
                                            String item_value = array_spinner[item];
                                            String nameContentType = "name";
                                            String shopURL = "getStoreList.php?city=" + item_value;

                                            String name_data =  DataCall.getJSON(shopURL,nameContentType);

                                            Bundle bundle = new Bundle();
                                            bundle.putString("shopData", name_data);
                                            Log.v(TAG,name_data);

                                              /** Intent myIntent = new Intent(SearchActivity.this, ShowRestaurant.class);
                                               myIntent.putExtras(bundle);
                                               startActivityForResult(myIntent, 0); */
                                            }
                                        else {
                                           // finish();
                                        }



                                    }

                                    public void onNothingSelected(AdapterView<?> arg0) {
                                    }

                                });


                            }catch (JSONException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            }



                            }
                        else {
                           // finish();
                        }



                    }

                    public void onNothingSelected(AdapterView<?> arg0) {
                    }

                });


            }catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }





      }

}

公共类SearchActivity扩展活动{
私有静态最终字符串TAG=“MyApp”；
@凌驾
创建时的公共void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.search\u布局）；
最终微调器zipspinner=（微调器）findViewById（R.id.zipspinner）；
最终微调器cityspinner=（微调器）findViewById（R.id.cityspinner）；
JSONArray JSONArray；
最终JSONArray cityArray；
试一试{
//从DATACALL（数据库）获取状态值
字符串喷丝头contentType=“state”；
字符串spinnerURL=“getStoreState.php”；
String spinner_data=DataCall.getJSON（spinnerURL，spinnerContentType）；
jsonArray=新jsonArray（微调器_数据）；
最终字符串[]数组_微调器=新字符串[jsonArray.length（）]；
for（int i=0；i arg0）{
}
});
}捕获（JSONException e）{
//TODO自动生成的捕捉块
e、 printStackTrace（）；
}
}
}

首先设置所有

适配器

和

字符串

数组，然后在获取城市数据时调用

适配器。notifyDatasetChanged（）

。大概是这样的：

String city_values[] = new String[]{"Please select a state."};
ArrayAdapter<String> adapter2 = new ArrayAdapter<String> (this,android.R.layout.simple_spinner_item, city_spinner);
adapter2.setDropDownViewResource(R.layout.city_spinner_layout);
cityspinner.setAdapter(adapter2);

---

谢谢你的指导。我现在正在实现它以进行测试+1检查。

zipspinner.setOnItemSelectedListener(new OnItemSelectedListener()
{
    public void onItemSelected(AdapterView<?> parent,View view, int pos, long id) {
        String value = state_values[pos];
        // now get your city list against value.           
        city_values = yourWayOfGettingData(value);
        adapter2.notifyDatasetChanged();
    }

    public void onNothingSelected(AdapterView parent) {
      // Do nothing.
    }

});