AutoCompleteTextView with Google Places shown in L

问题:

I need to make screen similar to this. I think it has autocompletetextview and listview to display returned results. Google Place API is used here to auto suggest places and listview adapter is updated accordingly. Please any kind of help is appreciated. Thanks in advance.

Checked android sample project on AutoComplete for places too. But it is not having any listview to display results. Instead it shows results in autocompletetextview spinner. Any modification we can do with that project

Link to google sample project

回答1:

You can achieve this exactly by using EditText and ListView, and not AutoCompleteTextView. Characters are entered in the EditText on the basis of which the results in the ListView are filtered by calling the GooglePlacesAutomplete webservice. The following is the code:

This is your layoout file ( EditText with ListView )

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
tools:context="com.example.siddarthshikhar.liftsharesample.EnterLocationActivity">

    <EditText
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:layout_width="250dp"
        android:layout_height="35dp"
        android:textColorHint="#ffffff"
        android:id="@+id/edEnterLocation"
        android:textColor="#ffffff"
        android:textSize="@dimen/abc_text_size_medium_material"
        android:layout_alignParentLeft="true"
        android:backgroundTint="#00000000"
        android:gravity="start|center">
        <requestFocus />
    </EditText>

<ListView android:id="@+id/listView1" android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/filterLayout"/>

</RelativeLayout>

In your corresponding Activity, access this EditText and apply Filterable. You have to use GooglePlacesAutompleteAdapter for this.

The following is the GooglePlacesAutompleteAdapter :

public class GooglePlacesAutocompleteAdapter extends ArrayAdapter implements Filterable {
private static final String LOG_TAG = "Google Places Autocomplete";
private static final String PLACES_API_BASE = "https://maps.googleapis.com/maps/api/place";
private static final String TYPE_AUTOCOMPLETE = "/autocomplete";
private static final String OUT_JSON = "/json";
private static final String API_KEY = "your_api_key";
private ArrayList<String> resultList;
private Context context = null;
public GooglePlacesAutocompleteAdapter(Context context, int textViewResourceId) {
    super(context, textViewResourceId);
    this.context = context;
}


@Override
public int getCount() {
    if(resultList != null)
        return resultList.size();
    else
        return 0;
}

@Override
public String getItem(int index) {
    return resultList.get(index);
}


public ArrayList<String> autocomplete(String input) {
    ArrayList<String> resultList = null;
    ArrayList<String> descriptionList = null;
    HttpURLConnection conn = null;
    StringBuilder jsonResults = new StringBuilder();
    try {
        StringBuilder sb = new StringBuilder(PLACES_API_BASE + TYPE_AUTOCOMPLETE + OUT_JSON);
        sb.append("?key=" + API_KEY);
        sb.append("&components=country:in");
        sb.append("&input=" + URLEncoder.encode(input, "utf8"));

        URL url = new URL(sb.toString());
        conn = (HttpURLConnection) url.openConnection();
        InputStreamReader in = new InputStreamReader(conn.getInputStream());

        // Load the results into a StringBuilder
        int read;
        char[] buff = new char[1024];
        while ((read = in.read(buff)) != -1) {
            jsonResults.append(buff, 0, read);
        }
    } catch (MalformedURLException e) {
        Log.e(LOG_TAG, "Error processing Places API URL", e);
        return resultList;
    } catch (IOException e) {
        Log.e(LOG_TAG, "Error connecting to Places API", e);
        return resultList;
    } finally {
        if (conn != null) {
            conn.disconnect();
        }
    }

    try {
        // Create a JSON object hierarchy from the results
        Log.d("yo",jsonResults.toString());
        JSONObject jsonObj = new JSONObject(jsonResults.toString());
        JSONArray predsJsonArray = jsonObj.getJSONArray("predictions");

        // Extract the Place descriptions from the results
        resultList = new ArrayList(predsJsonArray.length());
        descriptionList = new ArrayList(predsJsonArray.length());
        for (int i = 0; i < predsJsonArray.length(); i++) {
            resultList.add(predsJsonArray.getJSONObject(i).toString());
            descriptionList.add(predsJsonArray.getJSONObject(i).getString("description"));
        }
        saveArray(resultList.toArray(new String[resultList.size()]), "predictionsArray", getContext());
    } catch (JSONException e) {
        Log.e(LOG_TAG, "Cannot process JSON results", e);
    }

    return descriptionList;
}


@Override
public Filter getFilter() {
    Filter filter = new Filter() {
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            FilterResults filterResults = new FilterResults();
            if (constraint != null) {
                // Retrieve the autocomplete results.
                resultList = autocomplete(constraint.toString());

                // Assign the data to the FilterResults
                filterResults.values = resultList;
                filterResults.count = resultList.size();
            }
            return filterResults;
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            if (results != null && results.count > 0) {
                setImageVisibility();
                notifyDataSetChanged();
            } else {
                notifyDataSetInvalidated();
            }
        }
    };
    return filter;
}
}

Access the adapter and apply getFilter() to the EditText in the corresponding Activity. The following is to be added in your Activity corresponding to your layout created earlier:

dataAdapter = new   GooglePlacesAutocompleteAdapter(EnterLocationActivity.this, R.layout.adapter_google_places_autocomplete){

listView = (ListView) findViewById(R.id.listView1);
    // Assign adapter to ListView
    listView.setAdapter(dataAdapter);

    //enables filtering for the contents of the given ListView
    listView.setTextFilterEnabled(true);

etEnterLocation.addTextChangedListener(new TextWatcher() {

        public void afterTextChanged(Editable s) {
        }

        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        public void onTextChanged(CharSequence s, int start, int before, int count) {

            dataAdapter.getFilter().filter(s.toString());
        }
    });

This should get you going. You can modify your layout as you want. This basically loads the autocomplete data in a ListView.

回答2:

Here is an example of how to do just that.

You have the bonus of getting any of the AutocompletePrediction from the adapter. Just call getItem(int position) from the AutoCompleteTextView's AdapterView.OnItemClickListener for example and use any data from the prediction clicked as you wish.

Links relevant code:

/**
 * Adapter that handles Autocomplete requests from the Places Geo Data API.
 * {@link AutocompletePrediction} results from the API are frozen and stored directly in this
 * adapter. (See {@link AutocompletePrediction#freeze()}.)
 * <p>
 * Note that this adapter requires a valid {@link com.google.android.gms.common.api.GoogleApiClient}.
 * The API client must be maintained in the encapsulating Activity, including all lifecycle and
 * connection states. The API client must be connected with the {@link Places#GEO_DATA_API} API.
 */
public class PlaceAutocompleteAdapter
        extends ArrayAdapter<AutocompletePrediction> implements Filterable {

    private static final String TAG = "PlaceAutocompleteAdapter";
    private static final CharacterStyle STYLE_BOLD = new StyleSpan(Typeface.BOLD);
    /**
     * Current results returned by this adapter.
     */
    private ArrayList<AutocompletePrediction> 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 android.widget.ArrayAdapter#ArrayAdapter(android.content.Context, int)
     */
    public PlaceAutocompleteAdapter(Context context, GoogleApiClient googleApiClient,
            LatLngBounds bounds, AutocompleteFilter filter) {
        //change the layout nex for your own if you'd like
        super(context, android.R.layout.simple_expandable_list_item_2, android.R.id.text1);
        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 AutocompletePrediction getItem(int position) {
        return mResultList.get(position);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View row = super.getView(position, convertView, parent);

        // Sets the primary and secondary text for a row.
        // Note that getPrimaryText() and getSecondaryText() return a CharSequence that may contain
        // styling based on the given CharacterStyle.

        AutocompletePrediction item = getItem(position);

        TextView textView1 = (TextView) row.findViewById(android.R.id.text1);
        TextView textView2 = (TextView) row.findViewById(android.R.id.text2);
        textView1.setText(item.getPrimaryText(STYLE_BOLD));
        textView2.setText(item.getSecondaryText(STYLE_BOLD));

        return row;
    }

    /**
     * Returns the filter for the current set of autocomplete results.
     */
    @Override
    public Filter getFilter() {
        return new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                FilterResults results = new FilterResults();

                // We need a separate list to store the results, since
                // this is run asynchronously.
                ArrayList<AutocompletePrediction> filterData = new ArrayList<>();

                // Skip the autocomplete query if no constraints are given.
                if (constraint != null) {
                    // Query the autocomplete API for the (constraint) search string.
                    filterData = getAutocomplete(constraint);
                }

                results.values = filterData;
                if (filterData != null) {
                    results.count = filterData.size();
                } else {
                    results.count = 0;
                }

                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.
                    mResultList = (ArrayList<AutocompletePrediction>) results.values;
                    notifyDataSetChanged();
                } else {
                    // The API did not return any results, invalidate the data set.
                    notifyDataSetInvalidated();
                }
            }

            @Override
            public CharSequence convertResultToString(Object resultValue) {
                // Override this method to display a readable result in the AutocompleteTextView
                // when clicked.
                if (resultValue instanceof AutocompletePrediction) {
                    return ((AutocompletePrediction) resultValue).getFullText(null);
                } else {
                    return super.convertResultToString(resultValue);
                }
            }
        };
    }

    /**
     * Submits an autocomplete query to the Places Geo Data Autocomplete API.
     * Results are returned as frozen AutocompletePrediction objects, ready to be cached.
     * objects to store the Place ID and description that the API returns.
     * Returns an empty list if no results were found.
     * Returns null if the API client is not available or the query did not complete
     * successfully.
     * This method MUST be called off the main UI thread, as it will block until data is returned
     * from the API, which may include a network request.
     *
     * @param constraint Autocomplete query string
     * @return Results from the autocomplete API or null if the query was not successful.
     * @see Places#GEO_DATA_API#getAutocomplete(CharSequence)
     * @see AutocompletePrediction#freeze()
     */
    private ArrayList<AutocompletePrediction> 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.toString(),
                        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.");

            // Freeze the results immutable representation that can be stored safely.
            return DataBufferUtils.freezeAndClose(autocompletePredictions);
        }
        Log.e(TAG, "Google API client is not connected for autocomplete query.");
        return null;
    }
}

回答3:

You can achieve automcomplete textview in a simpler way by adding the below code to your layout

<fragment
     android:id="@+id/place_autocomplete_fragment"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
android:name="com.google.android.gms.location.places.ui.PlaceAutocompleteFragment"
/>

For using the above code you need to configure few settings for your application in Google develepor console .Please refer Android Places autocomplete example for complete example