所以我想实现一个动态AutoCompleteTextView，它将给出要在AutoCompleteTextView的dropDown中填充的列表。
以下是我写的文件和代码。
addLocationEdit = (AutoCompleteTextView) footerView.findViewById(R.id.add_locations_list_edit);
addLocationEdit.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
new ForLocations().execute(s);
}
@Override
public void afterTextChanged(Editable s) {
}
});
addLocationEdit.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Log.e(Constants.TAG, "LOCATIONS LIST SIZE: " + locationList.size());
list.add(new AddLocationsBean(locationList.get(position).getId(), locationList.get(position).getName(), locationList.get(position).getDistrict(), locationList.get(position).getState()));
adapter.notifyDataSetChanged();
addLocationEdit.setText("");
}
});
以下是我正在使用的AsyncTask：
class ForLocations extends AsyncTask<CharSequence, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
locationList = new ArrayList<>();
}
@Override
protected Void doInBackground(CharSequence... params) {
try {
CharSequence param = params[0];
URL url = new URL(Api.LOCATION_URL + "q=" + param);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("Accept", "application/json");
inputStream = conn.getErrorStream();
if (inputStream == null) {
inputStream = conn.getInputStream();
}
BufferedReader reader = new BufferedReader(
new InputStreamReader(inputStream), 1000);
stringBuilder = new StringBuilder();
stringBuilder.append(reader.readLine() + "\n");
String line = "0";
while ((line = reader.readLine()) != null) {
stringBuilder.append(line + "\n");
}
inputStream.close();
locationResponse = stringBuilder.toString();
} catch (Exception e) {
Log.e("LOCATION ERROR: ", "LOCATION ERROR: " + e);
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
try {
// PARSE JSON
locationAdapter = new LocationAutoCompleteAdapter(MainActivity.this, locationList);
addLocationEdit.setAdapter(locationAdapter);
locationAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
}
以下是我正在使用的适配器：
public class LocationAutoCompleteAdapter extends ArrayAdapter<LocationBean> {
Context context;
LayoutInflater inflater;
ArrayList<LocationBean> suggestions, list, tempList;
InputStream inputStream;
StringBuilder stringBuilder;
String locationResponse;
Filter nameFilter = new Filter() {
@Override
public CharSequence convertResultToString(Object resultValue) {
String str = ((LocationBean) resultValue).getName();
return str;
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
if (constraint != null) {
suggestions.clear();
for (LocationBean locationBean : tempList) {
if (locationBean.getName().toLowerCase().contains(constraint.toString().toLowerCase()) || locationBean.getState().toLowerCase().contains(constraint.toString().toLowerCase()) || locationBean.getDistrict().toLowerCase().contains(constraint.toString().toLowerCase())) {
suggestions.add(locationBean);
}
}
FilterResults filterResults = new FilterResults();
filterResults.values = suggestions;
filterResults.count = suggestions.size();
return filterResults;
} else {
return new FilterResults();
}
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
List<LocationBean> filterList = (ArrayList<LocationBean>) results.values;
if (results != null && results.count > 0) {
clear();
for (LocationBean locationBean : filterList) {
add(locationBean);
notifyDataSetChanged();
}
}
}
};
public LocationAutoCompleteAdapter(Context context, ArrayList<LocationBean> list) {
super(context, R.layout.location_autocomplete_list_item, list);
this.context = context;
this.list = list;
this.inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
tempList = new ArrayList<LocationBean>(list); // this makes the difference.
suggestions = new ArrayList<LocationBean>();
}
@Override
public LocationBean getItem(int position) {
return tempList.get(position);
}
@Override
public int getCount() {
return tempList.size();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.location_autocomplete_list_item, parent, false);
holder.name = (TextView) convertView.findViewById(R.id.autcom_name);
holder.state = (TextView) convertView.findViewById(R.id.autcom_state);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
if (list.get(position).getState().isEmpty()) {
holder.state.setVisibility(View.GONE);
} else {
holder.state.setVisibility(View.VISIBLE);
}
holder.name.setText(list.get(position).getName());
holder.state.setText(list.get(position).getState());
return convertView;
}
@Override
public Filter getFilter() {
return nameFilter;
}
class ViewHolder {
TextView name, state;
}}
当我点击列表项时我得到以下错误：
致命异常：mainProcess：varun.com.dynamicautocompletetextview， PID：27492 ava.lang.IndexOutOfBoundsException：索引0无效，大小为0 at java.util.ArrayList.throwIndexOutOfBoundsException（ArrayList.java:255） at java.util.ArrayList.get（ArrayList.java:308） at varun.com.dynamicautocompletetextview.MainActivity $ 3.onItemClick（MainActivity.java:110） 在android.widget.AutoCompleteTextView.performCompletion（AutoCompleteTextView.java:906） 在android.widget.AutoCompleteTextView.-wrap1（AutoCompleteTextView.java） 在android.widget.AutoCompleteTextView $ DropDownItemClickListener.onItemClick（AutoCompleteTextView.java:1202） 在android.widget.AdapterView.performItemClick（AdapterView.java:310） 在android.widget.AbsListView.performItemClick（AbsListView.java:1145） 在android.widget.AbsListView $ PerformClick.run（AbsListView.java:3066） 在android.widget.AbsListView $ 3.run（AbsListView.java:3903） 在android.os.Handler.handleCallback（Handler.java:739） 在android.os.Handler.dispatchMessage（Handler.java:95） 在android.os.Looper.loop（Looper.java:148） 在android.app.ActivityThread.main（ActivityThread.java:5466） at java.lang.reflect.Method.invoke（Native Method） 在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:726） 在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:616）
单击列表项时发生 IndexOutOfBoundsException 。
请说明可能的原因以及解决方案。
随意建议通过Web服务/ API调用实现AutoCompleteTextView填充的任何新方法。
谢谢。
修改 数据正在AutoCompleteTextView中填充。我已经记录并检查了，我可以在dropDown中看到数据本身。
答案 0 :(得分：1)
所以我找到了解决方案，就在这里。
getItem和getCount（如果您使用的是ArrayAdapter）。list.get(position)使用parent.getItemAtPosition(position) 如下：
LocationBean bean =（LocationBean）parent.getItemAtPosition（position）; list.add（new AddLocationsBean（bean.getId（），bean.getName（），bean.getDistrict（），bean.getState（）））; adapter.notifyDataSetChanged（）; addLocationEdit.setText（ “”）;
谢谢。