我有一个AutoCompleteTextView可以在用户键入时动态更新建议列表。我的问题是，当我键入列表时，列表会更新，但下拉菜单未显示！但是当我删除一个字符（退格）时，下拉菜单出现了！
我什至尝试autoText.showDropDown();在文本更改后显式调用，但它不起作用。
这是我的TextChangedListener：
private TextWatcher textChecker = new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i2, int i3) {
if(autoText.length()>9){
new GeoTask().execute();
}
}
@Override
public void afterTextChanged(Editable editable) {
if(autoText.length()>9){
autoText.showDropDown();
Log.i("UPDATE","showDropDown");
}
}
};
我什至尝试重置上面的适配器，autoText.showDropDown();但仍然没有：
autoText.setAdapter(null);
autoText.setAdapter(adapter);
有没有办法让它工作？
编辑：这是活动的完整代码。也许有人可以发现我做错了什么......
public class TestDoctor extends Activity {
TextView latText;
TextView lngText;
AutoCompleteTextView autoText;
ArrayAdapter<String> adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test_doctor);
latText = (TextView) findViewById(R.id.latTextView);
lngText = (TextView) findViewById(R.id.longTextView);
autoText = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView);
Button button = (Button) findViewById(R.id.buttonDoctor);
button.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
new GeoTask().execute();
}
});
autoText.setThreshold(10);
autoText.setHint("Οδός Αριθμός, Περιοχή");
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line);
autoText.setAdapter(adapter);
adapter.setNotifyOnChange(true);
autoText.addTextChangedListener(textChecker);
}
private TextWatcher textChecker = new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3){}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i2, int i3) {
if(autoText.length()>9){
new GeoTask().execute();
}
}
@Override
public void afterTextChanged(Editable editable) {}
};
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private List<SimpleAddress> getAddressesFromText(String address) {
address = address.replace(' ', '+');
HttpHelper httpHelper = new HttpHelper();
InputStream inputStream = httpHelper.makeHttpGetRequest("http://maps.google.com/maps/api/geocode/json?address=" + address + "&sensor=false");
String response = httpHelper.inputStreamToString(inputStream);
List<SimpleAddress> simpleAddresses = new ArrayList<SimpleAddress>();
try {
JSONObject jsonObject = new JSONObject(response);
int size = ((JSONArray) jsonObject.get("results")).length();
for (int i = 0; i<size; i++){
String formatted_address = ((JSONArray) jsonObject.get("results")).getJSONObject(i)
.getString("formatted_address");
Double lng = ((JSONArray) jsonObject.get("results")).getJSONObject(i)
.getJSONObject("geometry").getJSONObject("location")
.getDouble("lng");
Double lat = ((JSONArray) jsonObject.get("results")).getJSONObject(i)
.getJSONObject("geometry").getJSONObject("location")
.getDouble("lat");
simpleAddresses.add(i,new SimpleAddress(formatted_address,lat,lng));
}
return simpleAddresses;
} catch (JSONException e) {
return null;
}
}
public class GeoTask extends AsyncTask<Void, Void, Void> {
List<SimpleAddress> simpleAddresses = new ArrayList<SimpleAddress>();
@Override
protected Void doInBackground(Void... voids) {
Log.i("UPDATE","1");
try {
simpleAddresses = getAddressesFromText(autoText.getText().toString());
} catch (NullPointerException e) {
}
Log.i("UPDATE","2");
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
Log.i("UPDATE", "3");
int size = simpleAddresses.size();
if(size > 0){
adapter.clear();
Log.i("ADAPTER_SIZE",""+size);
for (int i = 0; i< size; i++){
adapter.add(simpleAddresses.get(i).getFormatted_address());
Log.i("ADDED",simpleAddresses.get(i).getFormatted_address());
}
Log.i("UPDATE","4");
autoText.setAdapter(null);
autoText.setAdapter(adapter);
autoText.showDropDown();
Log.i("UPDATE","showDropDown");
}
super.onPostExecute(aVoid);
}
}
}
编辑 2 我也试过这个，但它仍然不起作用。下拉菜单仅在我按退格键时显示...
@Override
public void afterTextChanged(Editable editable) {
runOnUiThread(updateAdapter);
}
...
private Runnable updateAdapter = new Runnable() {
public void run(){
Log.i("ADAPTER_UPDATE","start");
adapter.notifyDataSetChanged();
autoText.showDropDown();
Log.i("ADAPTER_UPDATE","end");
}
};
注意 问题是：我输入了一个地址。当我键入时，什么都没有出现。但我在 logcat 中看到适配器已更新。但下拉菜单不显示。然后当我删除一个字符时，下拉菜单会出现？？！！