我在我的应用中使用autoCompleteTextView。我想在AutoCompleteTextView中填充城市，我从服务器获取城市。我创建了一个arraylist并在其上设置了城市，然后在autoCompleteTextView上设置了适配器，但无法填充它。我无法理解为什么。
//代码
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sign_up);
GetAreas getAreas = new GetAreas();
getAreas.execute();
//在autoTextCompleteView上设置适配器
ArrayAdapter<String> adapter = new ArrayAdapter<String>
(this,android.R.layout.simple_list_item_1,cityArray);
editCity.setAdapter(adapter);
ArrayAdapter<String> adapterArea = new ArrayAdapter<String>
(this,android.R.layout.simple_list_item_1,areaArray);
editArea.setAdapter(adapterArea);
}
//获取城市的代码
private class GetAreas extends AsyncTask<String, Void, Void> {
ProgressDialog progressDialog;
String ResposeFromGetAreaApi;
@Override
protected Void doInBackground(String... params) {
//Invoke webservice
WebService wsc = new WebService();
ResposeFromGetAreaApi = wsc.GetAreas(serviceToken, "GetAreas");
return null;
}
@Override
protected void onPostExecute(Void result) {
Log.i(TAG, "GetAreas" +ResposeFromGetAreaApi);
try {
JSONObject jsonObject = new JSONObject(ResposeFromGetAreaApi);
JSONArray jsonArrayCity = jsonObject.getJSONArray("Table");
JSONArray jsonArrayArea = jsonObject.getJSONArray("Table1");
for (int i = 0; i < jsonArrayCity.length(); i++) {
modelCity = new ModelCity();
JSONObject cityObj = jsonArrayCity.getJSONObject(i);
{
String cityId = cityObj.getString("pkCityId");
modelCity.setCityId(cityId);
String cityName = cityObj.getString("CityName");
modelCity.setCityId(cityName);
}
modelCityArrayList.add(modelCity);
}
for (int j = 0; j < jsonArrayArea.length(); j++) {
modelCity = new ModelCity();
JSONObject areaObj = jsonArrayArea.getJSONObject(j);
{
String cityId = areaObj.getString("cityid");
modelCity.setAreaCityId(cityId);
String areaId = areaObj.getString("AreaId");
modelCity.setAreaId(areaId);
String areaName = areaObj.getString("AreaName");
modelCity.setAreaName(areaName);
}
modelAreaArrayList.add(modelCity);
}
}
catch (Exception e)
{
}
progressDialog.dismiss();
}
答案 0 :(得分：0)
请阅读Asynctask（用于从主线程卸载任务）。由于您正在执行任务并平行设置适配器，因此城市和区域阵列的数组大小均为0。收到并解析响应后，在onPostExecute中设置适配器。希望这有帮助。
答案 1 :(得分：0)
相当长，但我这样做了。希望你能得到它。
AutoCompleteTextView location;
ArrayAdapter<String> placeslistAdapter;
String PlaceArray[] = {};
ArrayList<String> places;
on onCreate：
location = (AutoCompleteTextView)findViewById(R.id.location);
places = new ArrayList<String>();
placeslistAdapter = new ArrayAdapter<String>(Activity1.this,
android.R.layout.simple_list_item_1, PlaceArray);
location.setAdapter(placeslistAdapter);
location.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
try {
String searchCode = url
+ URLEncoder.encode(arg0.toString(), "utf8");
AQuery aq = new AQuery(Activity.this);
aq.ajax(searchCode, JSONObject.class,
getplaceslistcallback());
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1,
int arg2, int arg3) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
}
});
最后获得回调
private AjaxCallback<JSONObject> getplaceslistcallback() {
return new AjaxCallback<JSONObject>() {
@Override
public void callback(String url, JSONObject object,
AjaxStatus status) {
super.callback(url, object, status);
Log.d("placesCallBack", object + "");
if (object != null) {
try {
JSONArray predictions = object
.getJSONArray("predictions");
places.clear();
for (int i = 0; i < predictions.length(); i++) {
JSONObject place = predictions.getJSONObject(i);
String description = place.getString("description");
places.add(description);
Log.d("place from google", description);
}
String[] stringArray = places.toArray(new String[places
.size()]);
PlaceArray = new String[places.size()];
for (int j = 0; j < places.size(); j++) {
PlaceArray[j] = places.get(j);
Log.d("placearray items",
places.get(j) + " " + PlaceArray[j] + " ,"
+ stringArray.toString());
}
PlaceArray = stringArray.clone();
Log.d("placesCallBack", PlaceArray.length
+ "");
location.setAdapter(placeslistAdapter);
placeslistAdapter.notifyDataSetChanged();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
};
}
答案 2 :(得分：0)
do such like that .. in ur asynctask class..
private class GetAreas extends AsyncTask<String, Void, String> {
ProgressDialog progressDialog;
String ResposeFromGetAreaApi;
@Override
protected Void doInBackground(String... params) {
//Invoke webservice
WebService wsc = new WebService();
ResposeFromGetAreaApi = wsc.GetAreas(serviceToken, "GetAreas");
try {
JSONObject jsonObject = new JSONObject(ResposeFromGetAreaApi);
JSONArray jsonArrayCity = jsonObject.getJSONArray("Table");
JSONArray jsonArrayArea = jsonObject.getJSONArray("Table1");
for (int i = 0; i < jsonArrayCity.length(); i++) {
modelCity = new ModelCity();
JSONObject cityObj = jsonArrayCity.getJSONObject(i);
{
String cityId = cityObj.getString("pkCityId");
modelCity.setCityId(cityId);
String cityName = cityObj.getString("CityName");
modelCity.setCityId(cityName);
}
modelCityArrayList.add(modelCity);
}
for (int j = 0; j < jsonArrayArea.length(); j++) {
modelCity = new ModelCity();
JSONObject areaObj = jsonArrayArea.getJSONObject(j);
{
String cityId = areaObj.getString("cityid");
modelCity.setAreaCityId(cityId);
String areaId = areaObj.getString("AreaId");
modelCity.setAreaId(areaId);
String areaName = areaObj.getString("AreaName");
modelCity.setAreaName(areaName);
}
modelAreaArrayList.add(modelCity);
}
}
catch (Exception e)
{
}
return ResposeFromGetAreaApi;
}
@Override
protected void onPostExecute(String result) {
Log.i(TAG, "GetAreas" +ResposeFromGetAreaApi);
if(!result.equals("")){
ArrayAdapter<String> adapter = new ArrayAdapter<String>
(this,android.R.layout.simple_list_item_1,cityArray);
editCity.setAdapter(adapter);
edtCity.setThreshold(2);
ArrayAdapter<String> adapterArea = new ArrayAdapter<String>
(this,android.R.layout.simple_list_item_1,areaArray);
editArea.setAdapter(adapterArea);
editArea.setThreshold(2);
}
progressDialog.dismiss();
}
}