我在其中一个教程中找到了这个PlacesAutoCompleteAdapter，但我无法更改它以显示指定的数据。
我想：
AutoCompleteTextView
你们能帮助我吗？
我想我需要更改mPlaceFilter以仅显示citites（locality或administrative_area_level_3），但我不知道如何......
public class PlacesAutoCompleteAdapter
extends ArrayAdapter<PlacesAutoCompleteAdapter.PlaceAutocomplete> implements Filterable {
private static final String TAG = "PlaceAutocomplete";
/**
* Current results returned by this adapter.
*/
private ArrayList<PlaceAutocomplete> mResultList;
/**
* Handles autocomplete requests.
*/
private GoogleApiClient mGoogleApiClient;
/**
* The bounds used for Places Geo Data autocomplete API requests.
*/
private LatLngBounds mBounds;
/**
* The autocomplete filter used to restrict queries to a specific set of place types.
*/
private AutocompleteFilter mPlaceFilter;
/**
* Initializes with a resource for text rows and autocomplete query bounds.
*
* @see ArrayAdapter#ArrayAdapter(Context, int)
*/
public PlacesAutoCompleteAdapter(Context context, int resource, GoogleApiClient googleApiClient,
LatLngBounds bounds, AutocompleteFilter filter) {
super(context, resource);
mGoogleApiClient = googleApiClient;
mBounds = bounds;
mPlaceFilter = filter;
}
/**
* Sets the bounds for all subsequent queries.
*/
public void setBounds(LatLngBounds bounds) {
mBounds = bounds;
}
/**
* Returns the number of results received in the last autocomplete query.
*/
@Override
public int getCount() {
return mResultList.size();
}
/**
* Returns an item from the last autocomplete query.
*/
@Override
public PlaceAutocomplete getItem(int position) {
return mResultList.get(position);
}
/**
* Returns the filter for the current set of autocomplete results.
*/
@Override
public Filter getFilter() {
Filter filter = new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
// Skip the autocomplete query if no constraints are given OR has got less than 3 letters
if (constraint != null && constraint.length() >= 3) {
// Query the autocomplete API for the (constraint) search string.
mResultList = getAutocomplete(constraint);
if (mResultList != null) {
// The API successfully returned results.
results.values = mResultList;
results.count = mResultList.size();
}
}
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
if (results != null && results.count > 0) {
// The API returned at least one result, update the data.
notifyDataSetChanged();
} else {
// The API did not return any results, invalidate the data set.
notifyDataSetInvalidated();
}
}
};
return filter;
}
private ArrayList<PlaceAutocomplete> getAutocomplete(CharSequence constraint) {
if (mGoogleApiClient.isConnected()) {
Log.i(TAG, "Starting autocomplete query for: " + constraint);
// Submit the query to the autocomplete API and retrieve a PendingResult that will
// contain the results when the query completes.
PendingResult<AutocompletePredictionBuffer> results =
Places.GeoDataApi
.getAutocompletePredictions(mGoogleApiClient, constraint.toString(),
mBounds, mPlaceFilter);
// This method should have been called off the main UI thread. Block and wait for at most 60s
// for a result from the API.
AutocompletePredictionBuffer autocompletePredictions = results
.await(60, TimeUnit.SECONDS);
// Confirm that the query completed successfully, otherwise return null
final Status status = autocompletePredictions.getStatus();
if (!status.isSuccess()) {
Toast.makeText(getContext(), "Error contacting API: " + status.getStatusMessage(),
Toast.LENGTH_SHORT).show();
Log.e(TAG, "Error getting autocomplete prediction API call: " + status.toString());
autocompletePredictions.release();
return null;
}
Log.i(TAG, "Query completed. Received " + autocompletePredictions.getCount()
+ " predictions.");
// Copy the results into our own data structure, because we can't hold onto the buffer.
// AutocompletePrediction objects encapsulate the API response (place ID and description).
Iterator<AutocompletePrediction> iterator = autocompletePredictions.iterator();
ArrayList resultList = new ArrayList<>(autocompletePredictions.getCount());
while (iterator.hasNext()) {
AutocompletePrediction prediction = iterator.next();
// Get the details of this prediction and copy it into a new PlaceAutocomplete object.
resultList.add(new PlaceAutocomplete(prediction.getPlaceId(), prediction.getFullText(null)));
}
// Release the buffer now that all data has been copied.
autocompletePredictions.release();
return resultList;
}
Log.e(TAG, "Google API client is not connected for autocomplete query.");
return null;
}
/**
* Holder for Places Geo Data Autocomplete API results.
*/
public class PlaceAutocomplete {
public CharSequence placeId;
public CharSequence description;
PlaceAutocomplete(CharSequence placeId, CharSequence description) {
this.placeId = placeId;
this.description = description;
}
@Override
public String toString() {
return description.toString();
}
}
}
答案 0 :(得分：0)
将过滤器设置为这样的城市：
mPlaceFilter = new AutocompleteFilter.Builder()
.setTypeFilter(AutocompleteFilter.TYPE_FILTER_CITIES)
.build();