如何通过编程实现谷歌地点自动完成功能

Question

如何通过编程实现谷歌地点自动完成功能

javaandroidgoogle-places-apigoogle-places-autocomplete

20

当我在 AutoCompleteTextView 中输入文本时，自动完成预测不会出现在我的 MapsActivity 中。

我尝试按照以下链接中的教程进行操作：https://www.youtube.com/watch?v=6Trdd9EnmqY&list=PLgCYzUzKIBE-vInwQhGSdnbyJ62nixHCt&index=8。其中一些方法最近已经过时，所以我查看了文档： https://developers.google.com/places/android-sdk/autocomplete，特别是“以编程方式获取地点预测”和“迁移到新 Places SDK 客户端”。我还按照同一个人的指南设置了API密钥，我认为这不应该是问题所在。这是我的第一个Android应用程序，也是我在这个网站上的第一个问题，请耐心等待我的回答。

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());
            }
        });

Autocomplete预测应该在用户在搜索栏中输入时显示，但这并没有发生。我也没有收到任何监听器的日志。

- Lorenzo Filizola

5个回答

9

public class PlaceArrayAdapter extends ArrayAdapter<PlaceArrayAdapter.PlaceAutocomplete> implements Filterable {

    private static final String TAG = "PlaceArrayAdapter";
    private final PlacesClient placesClient;
    private RectangularBounds mBounds;
    private ArrayList<PlaceAutocomplete> mResultList = new ArrayList<>();
    public Context context;

    /**
     * Constructor
     *
     * @param context  Context
     * @param resource Layout resource
     * @param bounds   Used to specify the search bounds
     * @param filter   Used to specify place types
     */
    public PlaceArrayAdapter(Context context, int resource, RectangularBounds bounds) {
        super(context, resource);
        this.context = context;
        mBounds = bounds;
        placesClient = com.google.android.libraries.places.api.Places.createClient(context);
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        View view = super.getView(position, convertView, parent);
        TypefaceHelper.typeface(view);
        return view;
    }

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

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

    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();
    
    
            // Use the builder to create a FindAutocompletePredictionsRequest.
            FindAutocompletePredictionsRequest request = FindAutocompletePredictionsRequest.builder()
                    // Call either setLocationBias() OR setLocationRestriction().
                    // .setLocationBias(bounds)
                    .setLocationBias(mBounds)
                    //.setCountry("au")
                    //   .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 (com.google.android.libraries.places.api.model.AutocompletePrediction prediction : findAutocompletePredictionsResponse.getAutocompletePredictions()) {
                        Log.i(TAG, prediction.getPlaceId());
                        Log.i(TAG, prediction.getPrimaryText(null).toString());
    
                        resultList.add(new PlaceAutocomplete(prediction.getPlaceId(), prediction.getFullText(null).toString()));
    
                    }
    
                return resultList;
            } else {
                return resultList;
            }
    
        }
    
        @Override
        public Filter getFilter() {
            Filter filter = new Filter() {
                @Override
                protected FilterResults performFiltering(CharSequence constraint) {
                    FilterResults results = new FilterResults();
                    if (constraint != null) {
                        // Query the autocomplete API for the entered constraint
                        Log.d(TAG, "Before Prediction");
                        mResultList = getPredictions(constraint);
                        Log.d(TAG, "After Prediction");
                        if (mResultList != null) {
                            // 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;
        }
    
    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();
        }
    }
}

/* Now call adapter from activity */

autoCompleteTextView = findViewById(R.id.autoCompleteTextView);
autoCompleteTextView.setThreshold(3);

//autoCompleteTextView.setOnItemClickListener(mAutocompleteClickListener);

mPlaceArrayAdapter = new PlaceArrayAdapter(
    this, R.layout.adapter_place_array, CURRENT_LOCATION_BONDS
);

- Vijesh Jat

@Vijesh Jat，如何使用TypefaceHelper？请举个例子。 - Alex455

@Alex455 在上面的代码中，TypeFaceHelper是我自定义的用于支持自定义字体的类。这与地点API无关。 - Vijesh Jat

9

在 Kotlin 中

TypeFilter.CITIES（城市）

>

TypeFilter.ADDRESS（地址）

activity layout file

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 
    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:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

<fragment
    android:id="@+id/mapLocation"
    android:name="com.google.android.gms.maps.MapFragment"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:layout_marginBottom="@dimen/_2sdp"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintBottom_toTopOf="@+id/autoCompleteEditText"/>

<androidx.appcompat.widget.AppCompatAutoCompleteTextView
    android:id="@+id/autoCompleteEditText"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_gravity="center_vertical"
    android:layout_weight="0.9"
    android:gravity="start"
    android:hint="Enter Location or Drag map to select location"
    android:padding="@dimen/_10sdp"
    android:singleLine="true"
    android:textColor="@color/color_black_two"
    android:textColorHint="@color/color_brown_grey"
    android:textSize="@dimen/_13ssp"
    app:layout_constraintStart_toStartOf="@+id/mapLocation"
    app:layout_constraintEnd_toEndOf="@+id/mapLocation"
    app:layout_constraintBottom_toBottomOf="parent"/>    

</androidx.constraintlayout.widget.ConstraintLayout>

In Activity

class MainActivity :AppCompatActivity(), OnMapReadyCallback {

private var mMap: GoogleMap? = null
private var placeAdapter: PlaceArrayAdapter? = null
private lateinit var mPlacesClient: PlacesClient

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
}

override fun onPostCreate(savedInstanceState: Bundle?) {
    super.onPostCreate(savedInstanceState)

    Places.initialize(this, "GOOGLE_MAPS_KEY")
    mPlacesClient = Places.createClient(this)

    val mapFragment: SupportMapFragment? = supportFragmentManager.findFragmentById(R.id.mapLocation) as? SupportMapFragment
    mapFragment?.getMapAsync(this)

    placeAdapter = PlaceArrayAdapter(this, R.layout.layout_item_places, mPlacesClient)
    autoCompleteEditText.setAdapter(placeAdapter)

    autoCompleteEditText.onItemClickListener = AdapterView.OnItemClickListener { parent, _, position, _ ->
        val place = parent.getItemAtPosition(position) as PlaceDataModel
        autoCompleteEditText.apply {
            setText(place.fullText)
            setSelection(autoCompleteEditText.length())
        }
    }
}

override fun onMapReady(p0: GoogleMap?) {

}
}

PlaceArrayAdapter

 class PlaceArrayAdapter(context: Context,val resource: Int, val mPlacesClient: PlacesClient) : ArrayAdapter<PlaceDataModel>(context, resource), Filterable {

 private var mContext : Context = context
 private var resultList = arrayListOf<PlaceDataModel>()

 override fun getCount(): Int {
     return when {
         resultList.isNullOrEmpty() -> 0
         else -> resultList.size
     }
 }

 override fun getItem(position: Int): PlaceDataModel? {
     return when {
         resultList.isNullOrEmpty() -> null
         else -> resultList[position]
     }
 }

 override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
     var view = convertView
     val viewHolder: ViewHolder
     if (view == null) {
         viewHolder = ViewHolder()
         view = LayoutInflater.from(context).inflate(resource, parent, false)
         viewHolder.description = view.findViewById(R.id.searchFullText) as TextView
         view.tag = viewHolder
     } else {
         viewHolder = view.tag as ViewHolder
     }
     bindView(viewHolder, resultList, position)
     return view!!
 }

 private fun bindView(viewHolder: ViewHolder, place: ArrayList<PlaceDataModel>, position: Int) {
     if (!place.isNullOrEmpty()) {
         viewHolder.description?.text = place[position].fullText
     }
 }

 override fun getFilter(): Filter {
     return object : Filter() {
         override fun publishResults(constraint: CharSequence?, results: FilterResults?) {
             if (results != null && results.count > 0) {
                 mContext.runOnUiThread {
                     notifyDataSetChanged()
                 }
             } else {
                 notifyDataSetInvalidated()
             }
         }

         override fun performFiltering(constraint: CharSequence?): FilterResults {
             val filterResults = FilterResults()
             if (constraint != null) {
                 resultList.clear()
                 val address = getAutocomplete(mPlacesClient, constraint.toString())
                 address?.let {
                     for (i in address.indices) {
                         val item = address[i]
                         resultList.add(PlaceDataModel(item.placeId, item.getFullText(StyleSpan(Typeface.BOLD)).toString()))
                     }
                 }
                 filterResults.values = resultList
                 filterResults.count = resultList.size
             }
             return filterResults
         }
     }
 }

 internal class ViewHolder {
     var description: TextView? = null
 }
 }

getAutocomplete method (you can add in adapter or extention)

 fun getAutocomplete(mPlacesClient: PlacesClient, constraint: CharSequence): List<AutocompletePrediction> {
   var list = listOf<AutocompletePrediction>()
   val token = AutocompleteSessionToken.newInstance()
   val request = FindAutocompletePredictionsRequest.builder().setTypeFilter(TypeFilter.ADDRESS).setSessionToken(token).setQuery(constraint.toString()).build()
   val prediction = mPlacesClient.findAutocompletePredictions(request)
   try {
       Tasks.await(prediction, TASK_AWAIT, TimeUnit.SECONDS)
   } catch (e: ExecutionException) {
       e.printStackTrace()
   } catch (e: InterruptedException) {
       e.printStackTrace()
   } catch (e: TimeoutException) {
       e.printStackTrace()
   }

   if (prediction.isSuccessful) {
       val findAutocompletePredictionsResponse = prediction.result
     findAutocompletePredictionsResponse?.let {
           list = findAutocompletePredictionsResponse.autocompletePredictions
       }
       return list
   }
   return list
 }

R.layout.layout_item_places

 <androidx.constraintlayout.widget.ConstraintLayout 
     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:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:orientation="vertical">

 <androidx.appcompat.widget.AppCompatTextView
     android:id="@+id/searchFullText"
     style="@style/TextViewGraphikRegular"
     android:layout_width="0dp"
     android:layout_height="wrap_content"
     android:layout_marginStart="@dimen/_5sdp"
     android:layout_marginEnd="@dimen/_8sdp"
     android:ellipsize="end"
     android:gravity="center_vertical"
     android:maxLines="2"
     android:padding="@dimen/_8sdp"
     android:text="@{dataModel.fullText}"
     android:textColor="@android:color/black"
     android:textSize="@dimen/_10ssp"
     app:layout_constraintBottom_toBottomOf="parent"
     app:layout_constraintEnd_toEndOf="parent"
     app:layout_constraintStart_toStartOf="parent"
     app:layout_constraintTop_toTopOf="parent"
     tools:text="Ahmedabad" />
 </androidx.constraintlayout.widget.ConstraintLayout>

更改此过滤器：

打开MapExtention文件
获取getAutocomplete方法
setTypeFilter(TypeFilter.CITIES)

#Github演示

- Shweta Chauhan

目前代码还没有上传到Github，但很快就会上传。顺便说一下，我已经添加了所有可以帮助你的代码。如果需要更多，请告诉我。 - Shweta Chauhan

1

@PriyankaKadam:https://github.com/ShwetaChauhan18/GooglePlacesAutoComplete - Shweta Chauhan

1

@PriyankaKadam：如果这对您有用，请在GitHub上加星并在此处点赞。 - Shweta Chauhan

2

在启用Google Places API后，我使用了这个适配器类：

Original Answer翻译成"最初的回答"

public class PlaceAutoCompleteAdapter
        extends ArrayAdapter<AutocompletePrediction> implements Filterable {

    private static final String TAG = "PlaceAutoCompleteAd";
    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) {
        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;
    }


}

我知道这个视频链接，它被称为"最初的回答"。

- DeePanShu

1

使用自定义布局的2021年更新的Kotlin答案

布局

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <EditText
        android:id="@+id/et_search_bar"
        style="@style/GreyEditTextStyle"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_marginStart="20dp"
        android:layout_marginTop="20dp"
        android:layout_marginEnd="20dp"
        android:maxLines="1"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/btn_select_location"
        style="@style/PrimaryButtonStyleThin"
        android:layout_width="wrap_content"
        android:layout_height="40dp"
        android:layout_marginEnd="20dp"
        android:elevation="7dp"
        android:text="@string/text_select_location"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="@id/et_search_bar" />

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_place_results"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:clipToPadding="false"
        android:paddingStart="30dp"
        app:layout_constraintEnd_toEndOf="@id/btn_select_location"
        app:layout_constraintStart_toStartOf="@id/et_search_bar"
        app:layout_constraintTop_toBottomOf="@id/btn_select_location" />

</androidx.constraintlayout.widget.ConstraintLayout>

RecyclerView适配器

class PlacesResultAdapter(
    var mContext: Context,
    val onClick: (prediction: AutocompletePrediction) -> Unit,
) :
    RecyclerView.Adapter<PlacesResultAdapter.ViewHolder>(), Filterable {
    private var mResultList: ArrayList<AutocompletePrediction>? = arrayListOf()
    private val placesClient: PlacesClient = Places.createClient(mContext)

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val view =
            LayoutInflater.from(parent.context)
                .inflate(R.layout.item_place_suggestions, parent, false)
        return ViewHolder(view)
    }

    override fun getItemCount(): Int {
        return mResultList!!.size
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        holder.onBind(position)
        holder.itemView.setOnClickListener {
            onClick(mResultList?.get(position)!!)
        }
    }

    inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        fun onBind(position: Int) {
            val res = mResultList?.get(position)
            itemView.apply {
                tv_address_title.text = res?.getPrimaryText(null)
                tv_address_sub_title.text = res?.getSecondaryText(null)
            }
        }
    }

    override fun getFilter(): Filter {
        return object : Filter() {
            override fun performFiltering(constraint: CharSequence): FilterResults {
                val results = FilterResults()
                mResultList = getPredictions(constraint)
                if (mResultList != null) {
                    results.values = mResultList
                    results.count = mResultList!!.size
                }
                return results
            }

            override fun publishResults(constraint: CharSequence, results: FilterResults) {

            }
        }
    }

    private fun getPredictions(constraint: CharSequence): ArrayList<AutocompletePrediction>? {
        val result: ArrayList<AutocompletePrediction> = arrayListOf()
        val token = AutocompleteSessionToken.newInstance()
        val request =
            FindAutocompletePredictionsRequest.builder() // Call either setLocationBias() OR setLocationRestriction().
                //.setLocationBias(bounds)
                //.setCountries("SG","LK")
                //.setTypeFilter(TypeFilter.ADDRESS)
                .setSessionToken(token)
                .setQuery(constraint.toString())
                .build()

        placesClient.findAutocompletePredictions(request)
            .addOnSuccessListener { response: FindAutocompletePredictionsResponse ->
                result.addAll(response.autocompletePredictions)
                notifyDataSetChanged()
            }.addOnFailureListener { exception: Exception? ->
                if (exception is ApiException) {
                    Log.e("TAG", "Place not found: " + exception.statusCode)
                    mContext.showToastLong("Place not found")
                }
            }
        return result
    }
}

活动代码示例

private fun init() {
    val apiKey = getString(R.string.places_api_key)
    if (!Places.isInitialized()) {
        Places.initialize(this, apiKey)
    }
    val placesClient = Places.createClient(this)
    placeAdapter = PlacesResultAdapter(this) { prediction ->
        pickedLocation = prediction
        et_search_bar.setText(prediction.getFullText(null).toString())
        rv_place_results.gone()
    }
    rv_place_results.layoutManager = LinearLayoutManager(this)
    rv_place_results.adapter = placeAdapter

    et_search_bar.addTextChangedListener(object : TextWatcher {
        override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
        }

        override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
        }

        override fun afterTextChanged(text: Editable?) {
            if (text.toString().isNotEmpty()) {
                placeAdapter!!.filter.filter(text.toString())
                if (rv_place_results.isGone) {
                    rv_place_results.show()
                }
            } else {
                if (rv_place_results.isVisible) {
                    rv_place_results.gone()
                }
            }
        }
    })
}

- Kasun Thilina

这个能和session一起工作吗？在getPredictions函数中，每按下一个字母就会生成一个新的Token。为每个字母付费不是一个好的解决方案。你知道如何让它适用于搜索会话的解决方案吗？ - DeveloperApps

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可以查看英文原文，
原文链接

- Mustofa Kamal · Accepted Answer

新版本2019

build.gradle (模块:app)

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();
        }
    }
}