这是我的问题：
如何让两个微调器“状态”和“城市”，但在用户首先选择状态之前，城市将为空。
我正在使用json数据动态构建我的微调器，你将在我的代码中看到，一旦状态微调器值为！= 0，那么我使用状态微调器的项值并为我的城市做另一个数据库调用。
当我创建新的ArrayAdapter以保存城市数据时，我唯一的错误是显示。我讨厌将我的所有代码发布到我的活动中，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();
}
}
}
答案 0 :(得分：1)
首先设置所有Adapter和String数组，然后在获取城市数据时调用adapter.notifyDatasetChanged()。像这样的东西：
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);
zipspinner实施OnItemSelectedListener。
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.
}
});