Android - AutoCompleteTextView动态更新问题
好吧,我试图在每次使用 TextWathcer 更改文本时动态更新 autoCompleteTextview ArrayAdapter。
每次文本更改时,新的 AsyncTask 中都会有一个 http 请求,并且在异步任务(onPostExecute)的回调中,我从适配器调用clear()并向其添加新项目,然后调用notifyDataSetChanged。 不幸的是,自动完成下拉列表从未显示。
请问,我该去哪里?!
这是代码:
AutoCompleteTextView acCountry = (AutoCompleteTextView)layout.findViewById(R.id.autoComplete);
final ArrayAdapter<RMAutoComplete.ListItem> countriesAdapter = new ArrayAdapter<RMAutoComplete.ListItem>(this.context,android.R.layout.simple_dropdown_item_1line);
acCountry.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence s, int start, int before, int count) {
if (s.length() > 1)
{
new AsyncTask<String, Void, List<RMAutoComplete.ListItem>>(){
@Override
protected List<ListItem> doInBackground(String... params) {
List<ListItem> l = null;
try {
l = location.getCountryData(params[0]);
} catch (Exception e) {
Log.e(TAG,"error when getCountryData",e);
}
return l;
}
@Override
protected void onPostExecute(List<ListItem> countries) {
countriesAdapter.clear();
if (countries != null)
for (ListItem listItem : countries) {
countriesAdapter.add(listItem);
}
countriesAdapter.notifyDataSetChanged();
}
}.execute(s.toString());
}
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
public void afterTextChanged(Editable s) {}
}
);
well i'm trying to update the autoCompleteTextview ArrayAdapter dynamiclly each time text changed by using TextWathcer.
every time text changed there is an http request in a new AsyncTask and in the callback from the async task (onPostExecute) i call clear() from the adapter and adding new items to him and then call notifyDataSetChanged.
Unfortunately the auto complete drop down is never shown..
please, where do i go worng?!
here is the code:
AutoCompleteTextView acCountry = (AutoCompleteTextView)layout.findViewById(R.id.autoComplete);
final ArrayAdapter<RMAutoComplete.ListItem> countriesAdapter = new ArrayAdapter<RMAutoComplete.ListItem>(this.context,android.R.layout.simple_dropdown_item_1line);
acCountry.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence s, int start, int before, int count) {
if (s.length() > 1)
{
new AsyncTask<String, Void, List<RMAutoComplete.ListItem>>(){
@Override
protected List<ListItem> doInBackground(String... params) {
List<ListItem> l = null;
try {
l = location.getCountryData(params[0]);
} catch (Exception e) {
Log.e(TAG,"error when getCountryData",e);
}
return l;
}
@Override
protected void onPostExecute(List<ListItem> countries) {
countriesAdapter.clear();
if (countries != null)
for (ListItem listItem : countries) {
countriesAdapter.add(listItem);
}
countriesAdapter.notifyDataSetChanged();
}
}.execute(s.toString());
}
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
public void afterTextChanged(Editable s) {}
}
);
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常见错误:您是否将适配器设置为
acCountry
?Common mistake : Did you set the adapter to
acCountry
at all?