问题
I am building an android application where I am using AutoComplete text to show the search of google place name.
Now the problem is I want to dismiss the list when I selected any item from the listview.
Here is my code -
!. oncreateview -
atvPlaces = (AutoCompleteTextView) findViewById(R.id.atv_places);
atvPlaces.setThreshold(1);
atvPlaces.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int
count) {
placesTask = new PlacesTask();
placesTask.execute(s.toString());
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
}
});
/** A method to download json data from url */
private String downloadUrl(String strUrl) throws IOException{
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try{
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while( ( line = br.readLine()) != null){
sb.append(line);
}
data = sb.toString();
br.close();
}catch(Exception e){
Log.d("Exception while downloading url", e.toString());
}finally{
iStream.close();
urlConnection.disconnect();
}
return data;
}
// Fetches all places from GooglePlaces AutoComplete Web Service
private class PlacesTask extends AsyncTask<String, Void, String>{
@Override
protected String doInBackground(String... place) {
// For storing data from web service
String data = "";
// Obtain browser key from https://code.google.com/apis/console
String key = "key";
String input="";
try {
input = "input=" + URLEncoder.encode(place[0], "utf-8");
input = input.replaceAll(" ", "%20");
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
}
// place type to be searched
String types = "types=geocode";
// Sensor enabled
String sensor = "sensor=false";
// Building the parameters to the web service
String parameters = input+"&"+types+"&"+sensor+"&"+key;
// Output format
String output = "json";
// Building the url to the web service
String url =
"https://maps.googleapis.com/maps/api/place/autocomplete/"+output+"?"+
parameters;
try{
// Fetching the data from web service in background
data = downloadUrl(url);
}catch(Exception e){
Log.d("Background Task",e.toString());
}
return data;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
// Creating ParserTask
parserTask = new ParserTask();
// Starting Parsing the JSON string returned by Web Service
parserTask.execute(result);
}
}
/** A class to parse the Google Places in JSON format */
private class ParserTask extends AsyncTask<String, Integer,
List<HashMap<String,String>>>{
JSONObject jObject;
@Override
protected List<HashMap<String, String>> doInBackground(String...
jsonData) {
List<HashMap<String, String>> places = null;
PlaceJSONParser placeJsonParser = new PlaceJSONParser();
try{
jObject = new JSONObject(jsonData[0]);
// Getting the parsed data as a List construct
places = placeJsonParser.parse(jObject);
}catch(Exception e){
Log.d("Exception",e.toString());
}
return places;
}
@Override
protected void onPostExecute(List<HashMap<String, String>> result) {
String[] from = new String[] { "description"};
int[] to = new int[] { android.R.id.text1 };
// Creating a SimpleAdapter for the AutoCompleteTextView
SimpleAdapter adapter = new SimpleAdapter(getBaseContext(),
result, android.R.layout.simple_list_item_1, from, to);
atvPlaces.showDropDown();
// Setting the adapter
atvPlaces.setAdapter(adapter);
atvPlaces.setOnItemClickListener(new
AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int
position, long id) {
atvPlaces.dismissDropDown();
String a = search_bar.getText().toString();
a = a.substring(0, Math.min(a.length(), 12));
atvPlaces.setText(a+"...");
}
});
}
}
Here is placejson code -
public class PlaceJSONParser {
/**
* Receives a JSONObject and returns a list
*/
public List<HashMap<String, String>> parse(JSONObject jObject) {
JSONArray jPlaces = null;
try {
/** Retrieves all the elements in the 'places' array */
jPlaces = jObject.getJSONArray("predictions");
} catch (JSONException e) {
e.printStackTrace();
}
/** Invoking getPlaces with the array of json object
* where each json object represent a place
*/
return getPlaces(jPlaces);
}
private List<HashMap<String, String>> getPlaces(JSONArray jPlaces) {
int placesCount = jPlaces.length();
List<HashMap<String, String>> placesList = new ArrayList<HashMap<String,
String>>();
HashMap<String, String> place = null;
/** Taking each place, parses and adds to list object */
for (int i = 0; i < placesCount; i++) {
try {
/** Call getPlace with place JSON object to parse the place */
place = getPlace((JSONObject) jPlaces.get(i));
placesList.add(place);
} catch (JSONException e) {
e.printStackTrace();
}
}
return placesList;
}
/**
* Parsing the Place JSON object
*/
private HashMap<String, String> getPlace(JSONObject jPlace) {
HashMap<String, String> place = new HashMap<String, String>();
String id = "";
String reference = "";
String description = "";
try {
description = jPlace.getString("description");
id = jPlace.getString("id");
reference = jPlace.getString("reference");
place.put("description", description);
place.put("_id", id);
place.put("reference", reference);
} catch (JSONException e) {
e.printStackTrace();
}
return place;
}
}
回答1:
Got it! Calling atvPlaces.setText() in the onItemClick triggers the PlacesTask all over again.
So you would need to call atvPlaces.removeTextChangedListener() before you call atvPlaces.setText().
And you can set the listener back after you update the text.
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
atvPlaces = (AutoCompleteTextView) findViewById(R.id.atv_places);
atvPlaces.setThreshold(1);
mTextWatcher = new MyTextWatcher();
atvPlaces.addTextChangedListener(mTextWatcher);
}
protected void onPostExecute(final List<HashMap<String, String>> result) {
String[] from = new String[] {"description"};
int[] to = new int[] { android.R.id.text1 };
SimpleAdapter adapter = new SimpleAdapter(MainActivity.this, result,
android.R.layout.simple_list_item_1, from, to);
atvPlaces.setAdapter(adapter);
atvPlaces.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
atvPlaces.removeTextChangedListener(mTextWatcher);
String a = search_bar.getText().toString();
a = a.substring(0, Math.min(a.length(), 12));
atvPlaces.setText(a+"...");
atvPlaces.dismissDropDown();
atvPlaces.addTextChangedListener(mTextWatcher);
}
});
atvPlaces.performValidation();
atvPlaces.showDropDown();
}
private class MyTextWatcher implements TextWatcher {
@Override
public void onTextChanged(CharSequence s, int start, int before, int
count) {
placesTask = new PlacesTask();
placesTask.execute(s.toString());
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
}
}
回答2:
Try using post(Runnable r) method with the AutoCompleteTextView like this:
atvPlaces.post(new Runnable() {
public void run() {
atvPlaces.dismissDropDown();
}
}
Hope that Helps!1
来源：https://stackoverflow.com/questions/29072748/how-to-use-dismissdropdown-in-simpleadapter-listview-in-android