如何以编程方式实现Google Places自动完成

Question

当我在AutoCompleteTextView（mSearchText）中键入文本时，自动完成预测不会显示在MapsActivity中。

我尝试通过以下链接遵循该教程：https :
//www.youtube.com/watch?v=6Trdd9EnmqY&list=PLgCYzUzKIBE-
vInwQhGSdnbyJ62nixHCt&index=8
。最近已弃用了其中使用的某些方法，因此我检查了https://developers.google.com/places/android-
sdk/autocomplete上的文档，尤其是“以编程方式获取位置预测”和“迁移到New Places SDK客户端”
。我还遵循了同一个人的指南来设置我的API密钥，我认为这不应该成为问题。这是我的第一个Android应用程序，也是我在此站点上的第一个问题，所以请耐心等待。

    Places.initialize(getApplicationContext(), getString(R.string.google_maps_API_key));
    PlacesClient placesClient = Places.createClient(this);

    FindAutocompletePredictionsRequest request = FindAutocompletePredictionsRequest.builder()
            .setLocationBias(RECTANGULAR_BOUNDS)
            .setQuery(mSearchText.getText().toString())
            .build();

    placesClient.findAutocompletePredictions(request).addOnSuccessListener((response) -> {
        for (AutocompletePrediction prediction : response.getAutocompletePredictions()) {
            Log.i(TAG, prediction.getPlaceId());
            Log.i(TAG, prediction.getPrimaryText(null).toString());
        }
    }).addOnFailureListener((exception) -> {
        if (exception instanceof ApiException) {
            ApiException apiException = (ApiException) exception;
            Log.e(TAG, "Place not found: " + apiException.getStatusCode());
        }
    });

当用户在搜索栏中键入内容时，自动完成预测将显示出来，但这不会发生。我也没有从听众那里得到任何日志。

Answer 1

build.gradle（模块：应用）

implementation 'com.google.android.gms:play-services-maps:17.0.0'
implementation 'com.google.android.gms:play-services-location:17.0.0'
implementation 'com.google.android.gms:play-services-places:17.0.0'
implementation 'com.google.android.libraries.places:places:1.1.0'

活动布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:padding="15dp"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".activity.MapsActivity">
    <EditText
        android:id="@+id/place_search"
        android:hint="Search"
        android:inputType="textPostalAddress"
        android:padding="15dp"
        android:layout_marginBottom="15dp"
        android:drawableLeft="@drawable/places_ic_search"
        android:background="@drawable/edit_text_border"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/places_recycler_view"
        android:background="#FFF"
        android:orientation="vertical"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    </androidx.recyclerview.widget.RecyclerView>
</LinearLayout>

活动

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

import com.google.android.libraries.places.api.Places;
import com.google.android.libraries.places.api.model.Place;
import com.zaaibo.drive.R;
import com.zaaibo.drive.adapter.PlacesAutoCompleteAdapter;

public class MapsActivity extends AppCompatActivity implements PlacesAutoCompleteAdapter.ClickListener{

    private PlacesAutoCompleteAdapter mAutoCompleteAdapter;
    private RecyclerView recyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_settings);

        Places.initialize(this, getResources().getString(R.string.google_maps_key));

        recyclerView = (RecyclerView) findViewById(R.id.places_recycler_view);
        ((EditText) findViewById(R.id.place_search)).addTextChangedListener(filterTextWatcher);

        mAutoCompleteAdapter = new PlacesAutoCompleteAdapter(this);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        mAutoCompleteAdapter.setClickListener(this);
        recyclerView.setAdapter(mAutoCompleteAdapter);
        mAutoCompleteAdapter.notifyDataSetChanged();
    }

    private TextWatcher filterTextWatcher = new TextWatcher() {
        public void afterTextChanged(Editable s) {
            if (!s.toString().equals("")) {
                mAutoCompleteAdapter.getFilter().filter(s.toString());
                if (recyclerView.getVisibility() == View.GONE) {recyclerView.setVisibility(View.VISIBLE);}
            } else {
                if (recyclerView.getVisibility() == View.VISIBLE) {recyclerView.setVisibility(View.GONE);}
            }
        }
        public void beforeTextChanged(CharSequence s, int start, int count, int after) { }
        public void onTextChanged(CharSequence s, int start, int before, int count) { }
    };

    @Override
    public void click(Place place) {
        Toast.makeText(this, place.getAddress()+", "+place.getLatLng().latitude+place.getLatLng().longitude, Toast.LENGTH_SHORT).show();
    }
}

适配器

import android.content.Context;
import android.graphics.Typeface;
import android.text.style.CharacterStyle;
import android.text.style.StyleSpan;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.google.android.gms.common.api.ApiException;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
import com.google.android.gms.tasks.Tasks;
import com.google.android.libraries.places.api.model.AutocompletePrediction;
import com.google.android.libraries.places.api.model.AutocompleteSessionToken;
import com.google.android.libraries.places.api.model.Place;
import com.google.android.libraries.places.api.net.FetchPlaceRequest;
import com.google.android.libraries.places.api.net.FetchPlaceResponse;
import com.google.android.libraries.places.api.net.FindAutocompletePredictionsRequest;
import com.google.android.libraries.places.api.net.FindAutocompletePredictionsResponse;
import com.google.android.libraries.places.api.net.PlacesClient;
import com.zaaibo.drive.R;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class PlacesAutoCompleteAdapter extends RecyclerView.Adapter<PlacesAutoCompleteAdapter.PredictionHolder> implements Filterable {
    private static final String TAG = "PlacesAutoAdapter";
    private ArrayList<PlaceAutocomplete> mResultList = new ArrayList<>();

    private Context mContext;
    private CharacterStyle STYLE_BOLD;
    private CharacterStyle STYLE_NORMAL;
    private final PlacesClient placesClient;
    private ClickListener clickListener;

    public PlacesAutoCompleteAdapter(Context context) {
        mContext = context;
        STYLE_BOLD = new StyleSpan(Typeface.BOLD);
        STYLE_NORMAL = new StyleSpan(Typeface.NORMAL);
        placesClient = com.google.android.libraries.places.api.Places.createClient(context);
    }

    public void setClickListener(ClickListener clickListener) {
        this.clickListener = clickListener;
    }

    public interface ClickListener {
        void click(Place place);
    }

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


    private ArrayList<PlaceAutocomplete> getPredictions(CharSequence constraint) {

        final ArrayList<PlaceAutocomplete> resultList = new ArrayList<>();

        // Create a new token for the autocomplete session. Pass this to FindAutocompletePredictionsRequest,
        // and once again when the user makes a selection (for example when calling fetchPlace()).
        AutocompleteSessionToken token = AutocompleteSessionToken.newInstance();

        //https://gist.github.com/graydon/11198540
        // Use the builder to create a FindAutocompletePredictionsRequest.
        FindAutocompletePredictionsRequest request = FindAutocompletePredictionsRequest.builder()
                // Call either setLocationBias() OR setLocationRestriction().
                //.setLocationBias(bounds)
                //.setCountry("BD")
                //.setTypeFilter(TypeFilter.ADDRESS)
                .setSessionToken(token)
                .setQuery(constraint.toString())
                .build();

        Task<FindAutocompletePredictionsResponse> autocompletePredictions = placesClient.findAutocompletePredictions(request);

        // This method should have been called off the main UI thread. Block and wait for at most
        // 60s for a result from the API.
        try {
            Tasks.await(autocompletePredictions, 60, TimeUnit.SECONDS);
        } catch (ExecutionException | InterruptedException | TimeoutException e) {
            e.printStackTrace();
        }

        if (autocompletePredictions.isSuccessful()) {
            FindAutocompletePredictionsResponse findAutocompletePredictionsResponse = autocompletePredictions.getResult();
            if (findAutocompletePredictionsResponse != null)
                for (AutocompletePrediction prediction : findAutocompletePredictionsResponse.getAutocompletePredictions()) {
                    Log.i(TAG, prediction.getPlaceId());
                    resultList.add(new PlaceAutocomplete(prediction.getPlaceId(), prediction.getPrimaryText(STYLE_NORMAL).toString(), prediction.getFullText(STYLE_BOLD).toString()));
                }

            return resultList;
        } else {
            return resultList;
        }

    }

    @NonNull
    @Override
    public PredictionHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        LayoutInflater layoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View convertView = layoutInflater.inflate(R.layout.place_recycler_item_layout, viewGroup, false);
        return new PredictionHolder(convertView);
    }

    @Override
    public void onBindViewHolder(@NonNull PredictionHolder mPredictionHolder, final int i) {
        mPredictionHolder.address.setText(mResultList.get(i).address);
        mPredictionHolder.area.setText(mResultList.get(i).area);
    }

    @Override
    public int getItemCount() {
        return mResultList.size();
    }

    public PlaceAutocomplete getItem(int position) {
        return mResultList.get(position);
    }

    public class PredictionHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        private TextView address, area;
        private LinearLayout mRow;

        PredictionHolder(View itemView) {
            super(itemView);
            area = itemView.findViewById(R.id.place_area);
            address = itemView.findViewById(R.id.place_address);
            mRow = itemView.findViewById(R.id.place_item_view);
            itemView.setOnClickListener(this);
        }

        @Override
        public void onClick(View v) {
            PlaceAutocomplete item = mResultList.get(getAdapterPosition());
            if (v.getId() == R.id.place_item_view) {

                String placeId = String.valueOf(item.placeId);

                List<Place.Field> placeFields = Arrays.asList(Place.Field.ID, Place.Field.NAME, Place.Field.LAT_LNG, Place.Field.ADDRESS);
                FetchPlaceRequest request = FetchPlaceRequest.builder(placeId, placeFields).build();
                placesClient.fetchPlace(request).addOnSuccessListener(new OnSuccessListener<FetchPlaceResponse>() {
                    @Override
                    public void onSuccess(FetchPlaceResponse response) {
                        Place place = response.getPlace();
                        clickListener.click(place);
                    }
                }).addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception exception) {
                        if (exception instanceof ApiException) {
                            Toast.makeText(mContext, exception.getMessage() + "", Toast.LENGTH_SHORT).show();
                        }
                    }
                });
            }
        }
    }

    /**
     * Holder for Places Geo Data Autocomplete API results.
     */
    public class PlaceAutocomplete {

        public CharSequence placeId;
        public CharSequence address, area;

        PlaceAutocomplete(CharSequence placeId, CharSequence area, CharSequence address) {
            this.placeId = placeId;
            this.area = area;
            this.address = address;
        }

        @Override
        public String toString() {
            return area.toString();
        }
    }
}