0

アプリに Google マップを統合するのに苦労しています。なんとかユーザーの場所と近くの場所を含む地図を表示できましたが、場所が更新されていません...コードを何度か調べましたが、間違ったコマンドが1つも見つかりませんでした..plzはそれを整理するのに役立ちます..

NearbyPlacesActivity -

package com.example.travelplanner;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;

import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.Menu;
import android.widget.Toast;

/*
 * MyMapActivity class forms part of Map application
 * in Mobiletuts+ tutorial series:
 * Using Google Maps and Google Places in Android Apps
 * 
 * This version of the class is for the final part of the series.
 * 
 * Sue Smith
 * March/ April 2013
 */
public class NearbyPlacesActivity extends Activity implements LocationListener {

    //instance variables for Marker icon drawable resources
    private int userIcon, foodIcon, drinkIcon, shopIcon, otherIcon;

    //the map
    private GoogleMap theMap;

    //location manager
    private LocationManager locMan;

    //user marker
    private Marker userMarker;

    //places of interest
    private Marker[] placeMarkers;
    //max
    private final int MAX_PLACES = 20;//most returned from google
    //marker options
    private MarkerOptions[] places;

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

        //get drawable IDs
        userIcon = R.drawable.yellow_point;
        foodIcon = R.drawable.red_point;
        drinkIcon = R.drawable.blue_point;
        shopIcon = R.drawable.green_point;
        otherIcon = R.drawable.purple_point;

        //find out if we already have it
        if(theMap==null){
            //get the map
            theMap = ((MapFragment)getFragmentManager().findFragmentById(R.id.the_map)).getMap();
            //check in case map/ Google Play services not available
            if(theMap!=null){
                //ok - proceed
                theMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
                //create marker array
                placeMarkers = new Marker[MAX_PLACES];
                //update location
                updatePlaces();
            }

        }
    }

    //location listener functions

    @Override
    public void onLocationChanged(Location location) {
        Log.v("MyMapActivity", "location changed");
        updatePlaces();
    }
    @Override
    public void onProviderDisabled(String provider){
        Log.v("MyMapActivity", "provider disabled");
    }
    @Override
    public void onProviderEnabled(String provider) {
        Log.v("MyMapActivity", "provider enabled");
    }
    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        Log.v("MyMapActivity", "status changed");
    }

    /*
     * update the place markers
     */
    private void updatePlaces(){
        //get location manager
        locMan = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        //get last location
        Location lastLoc = locMan.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
        double lat = lastLoc.getLatitude();
        double lng = lastLoc.getLongitude();
        Toast.makeText(getApplicationContext(), lat+","+lng, Toast.LENGTH_LONG).show();
        //create LatLng
        LatLng lastLatLng = new LatLng(lat, lng);

        //remove any existing marker
        if(userMarker!=null) userMarker.remove();
        //create and set marker properties
        userMarker = theMap.addMarker(new MarkerOptions()
        .position(lastLatLng)
        .title("You are here")
        .icon(BitmapDescriptorFactory.fromResource(userIcon))
        .snippet("Your last recorded location"));
        //move to location
        theMap.animateCamera(CameraUpdateFactory.newLatLng(lastLatLng), 3000, null);

        //build places query string
        String placesSearchStr = "https://maps.googleapis.com/maps/api/place/nearbysearch/" +
                "json?location="+lat+","+lng+
                "&radius=7000&sensor=true" +
                "&types=food|bar|movie_theater|museum|bank"+
                "&key=AIzaSyBqDgqbxFenOtooTivY5YSsJ2JrwBK42hw";//ADD KEY

        //execute query
        new GetPlaces().execute(placesSearchStr);       
        locMan.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 30000, 100, this);
    }

    private class GetPlaces extends AsyncTask<String, Void, String> {
        @Override
        protected String doInBackground(String... placesURL) {
            //fetch places

            //build result as string
            StringBuilder placesBuilder = new StringBuilder();
            //process search parameter string(s)
            for (String placeSearchURL : placesURL) {
                HttpClient placesClient = new DefaultHttpClient();
                try {
                    //try to fetch the data

                    //HTTP Get receives URL string
                    HttpGet placesGet = new HttpGet(placeSearchURL);
                    //execute GET with Client - return response
                    HttpResponse placesResponse = placesClient.execute(placesGet);
                    //check response status
                    StatusLine placeSearchStatus = placesResponse.getStatusLine();
                    //only carry on if response is OK
                    if (placeSearchStatus.getStatusCode() == 200) {
                        //get response entity
                        HttpEntity placesEntity = placesResponse.getEntity();
                        //get input stream setup
                        InputStream placesContent = placesEntity.getContent();
                        //create reader
                        InputStreamReader placesInput = new InputStreamReader(placesContent);
                        //use buffered reader to process
                        BufferedReader placesReader = new BufferedReader(placesInput);
                        //read a line at a time, append to string builder
                        String lineIn;
                        while ((lineIn = placesReader.readLine()) != null) {
                            placesBuilder.append(lineIn);
                        }
                    }
                }
                catch(Exception e){ 
                    e.printStackTrace(); 
                }
            }
            return placesBuilder.toString();
        }
        //process data retrieved from doInBackground
        protected void onPostExecute(String result) {
            //parse place data returned from Google Places
            //remove existing markers
            if(placeMarkers!=null){
                for(int pm=0; pm<placeMarkers.length; pm++){
                    if(placeMarkers[pm]!=null)
                        placeMarkers[pm].remove();
                }
            }
            try {
                //parse JSON

                //create JSONObject, pass stinrg returned from doInBackground
                JSONObject resultObject = new JSONObject(result);
                //get "results" array
                JSONArray placesArray = resultObject.getJSONArray("results");
                //marker options for each place returned
                places = new MarkerOptions[placesArray.length()];
                //loop through places
                for (int p=0; p<placesArray.length(); p++) {
                    //parse each place
                    //if any values are missing we won't show the marker
                    boolean missingValue=false;
                    LatLng placeLL=null;
                    String placeName="";
                    String vicinity="";
                    int currIcon = otherIcon;
                    try{
                        //attempt to retrieve place data values
                        missingValue=false;
                        //get place at this index
                        JSONObject placeObject = placesArray.getJSONObject(p);
                        //get location section
                        JSONObject loc = placeObject.getJSONObject("geometry")
                                .getJSONObject("location");
                        //read lat lng
                        placeLL = new LatLng(Double.valueOf(loc.getString("lat")), 
                                Double.valueOf(loc.getString("lng")));  
                        //get types
                        JSONArray types = placeObject.getJSONArray("types");
                        //loop through types
                        for(int t=0; t<types.length(); t++){
                            //what type is it
                            String thisType=types.get(t).toString();
                            //check for particular types - set icons
                            if(thisType.contains("food")){
                                currIcon = foodIcon;
                                break;
                            }
                            else if(thisType.contains("bar")){
                                currIcon = drinkIcon;
                                break;
                            }
                            else if(thisType.contains("movie_theater")){
                                currIcon = shopIcon;
                                break;
                            }
                        }
                        //vicinity
                        vicinity = placeObject.getString("vicinity");
                        //name
                        placeName = placeObject.getString("name");
                    }
                    catch(JSONException jse){
                        Log.v("PLACES", "missing value");
                        missingValue=true;
                        jse.printStackTrace();
                    }
                    //if values missing we don't display
                    if(missingValue)    places[p]=null;
                    else
                        places[p]=new MarkerOptions()
                    .position(placeLL)
                    .title(placeName)
                    .icon(BitmapDescriptorFactory.fromResource(currIcon))
                    .snippet(vicinity);
                }
            }
            catch (Exception e) {
                e.printStackTrace();
            }
            if(places!=null && placeMarkers!=null){
                for(int p=0; p<places.length && p<placeMarkers.length; p++){
                    //will be null if a value was missing
                    if(places[p]!=null)
                        placeMarkers[p]=theMap.addMarker(places[p]);

            }

        }
    }   
}
    @Override
    protected void onResume() {
        super.onResume();
        if(theMap!=null){
            locMan.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 30000, 100, this);
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        if(theMap!=null){
            locMan.removeUpdates(this);
        }
    }
}

logcat にエラーはありません。マニフェストは私の懸念どおり正確です... APIキーも正しいです..

知りたいことがもう 1 つあります..前のアクティビティのボタンをクリックして特定の都市の地図を表示するにはどうすればよいですか..たとえば: アクティビティ 1 で、edittext に New York と入力し、ボタンをクリックするとアクティビティが開きましたニューヨーク市への地図とポイントを含む2つ...また、ニューヨークの観光スポットを異なるマーカーで表示したい....

これは、あなたのガイダンスに従って改訂されたコードです..

package com.example.travelplanner;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URLEncoder;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;

import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.Menu;
import android.widget.Toast;

/*
 * MyMapActivity class forms part of Map application
 * in Mobiletuts+ tutorial series:
 * Using Google Maps and Google Places in Android Apps
 * 
 * This version of the class is for the final part of the series.
 * 
 * Sue Smith
 * March/ April 2013
 */
public class NearbyPlacesActivity extends Activity implements LocationListener {

    //instance variables for Marker icon drawable resources
    private int userIcon, foodIcon, drinkIcon, shopIcon, otherIcon;

    //the map
    private GoogleMap theMap;

    //location manager
    private LocationManager locMan;

    //user marker
    private Marker userMarker;

    //places of interest
    private Marker[] placeMarkers;
    //max
    private final int MAX_PLACES = 20;//most returned from google
    //marker options
    private MarkerOptions[] places;

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

        //get drawable IDs
        userIcon = R.drawable.yellow_point;
        foodIcon = R.drawable.red_point;
        drinkIcon = R.drawable.blue_point;
        shopIcon = R.drawable.green_point;
        otherIcon = R.drawable.purple_point;

        //find out if we already have it
        if(theMap==null){
            //get the map
            theMap = ((MapFragment)getFragmentManager().findFragmentById(R.id.the_map)).getMap();
            //check in case map/ Google Play services not available
            if(theMap!=null){
                //ok - proceed
                theMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
                //create marker array
                placeMarkers = new Marker[MAX_PLACES];

            }

        }
    }

    //location listener functions

    @Override
    public void onLocationChanged(Location location) {
        Log.v("MyMapActivity", "location changed");
        updatePlaces(location);
    }
    @Override
    public void onProviderDisabled(String provider){
        Log.v("MyMapActivity", "provider disabled");
    }
    @Override
    public void onProviderEnabled(String provider) {
        Log.v("MyMapActivity", "provider enabled");
    }
    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        Log.v("MyMapActivity", "status changed");
    }

    /*
     * update the place markers
     */
    private void updatePlaces(Location givenlocation){
        //get location manager
        double lat = givenlocation.getLatitude();
        double lng = givenlocation.getLongitude();
        Toast.makeText(getApplicationContext(), lat+","+lng, Toast.LENGTH_LONG).show();
        //create LatLng
        LatLng lastLatLng = new LatLng(lat, lng);

        //remove any existing marker
        if(userMarker!=null) userMarker.remove();
        //create and set marker properties
        userMarker = theMap.addMarker(new MarkerOptions()
        .position(lastLatLng)
        .title("You are here")
        .icon(BitmapDescriptorFactory.fromResource(userIcon))
        .snippet("Your last recorded location"));
        //move to location
        theMap.animateCamera(CameraUpdateFactory.newLatLng(lastLatLng), 3000, null);

        //build places query string
        @SuppressWarnings("deprecation")
        String encodedstr = URLEncoder.encode("food|bar|movie_theater|museum|bank");
        String placesSearchStr = "https://maps.googleapis.com/maps/api/place/nearbysearch/" +
                "json?location="+lat+","+lng+
                "&radius=7000&sensor=true"+
                "&types="+encodedstr+
                "&key=AIzaSyBqDgqbxFenOtooTivY5YSsJ2JrwBK42hw";//ADD KEY

        //execute query
        new GetPlaces().execute(placesSearchStr);       
        locMan.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 30000, 100, this);
    }

    private class GetPlaces extends AsyncTask<String, Void, String> {
        @Override
        protected String doInBackground(String... placesURL) {
            //fetch places

            //build result as string
            StringBuilder placesBuilder = new StringBuilder();
            //process search parameter string(s)
            for (String placeSearchURL : placesURL) {
                HttpClient placesClient = new DefaultHttpClient();
                try {
                    //try to fetch the data

                    //HTTP Get receives URL string
                    HttpGet placesGet = new HttpGet(placeSearchURL);
                    //execute GET with Client - return response
                    HttpResponse placesResponse = placesClient.execute(placesGet);
                    //check response status
                    StatusLine placeSearchStatus = placesResponse.getStatusLine();
                    //only carry on if response is OK
                    if (placeSearchStatus.getStatusCode() == 200) {
                        //get response entity
                        HttpEntity placesEntity = placesResponse.getEntity();
                        //get input stream setup
                        InputStream placesContent = placesEntity.getContent();
                        //create reader
                        InputStreamReader placesInput = new InputStreamReader(placesContent);
                        //use buffered reader to process
                        BufferedReader placesReader = new BufferedReader(placesInput);
                        //read a line at a time, append to string builder
                        String lineIn;
                        while ((lineIn = placesReader.readLine()) != null) {
                            placesBuilder.append(lineIn);
                        }
                    }
                }
                catch(Exception e){ 
                    e.printStackTrace(); 
                }
            }
            return placesBuilder.toString();
        }
        //process data retrieved from doInBackground
        protected void onPostExecute(String result) {
            //parse place data returned from Google Places
            //remove existing markers
            if(placeMarkers!=null){
                for(int pm=0; pm<placeMarkers.length; pm++){
                    if(placeMarkers[pm]!=null)
                        placeMarkers[pm].remove();
                }
            }
            try {
                //parse JSON

                //create JSONObject, pass stinrg returned from doInBackground
                JSONObject resultObject = new JSONObject(result);
                //get "results" array
                JSONArray placesArray = resultObject.getJSONArray("results");
                //marker options for each place returned
                places = new MarkerOptions[placesArray.length()];
                //loop through places
                for (int p=0; p<placesArray.length(); p++) {
                    //parse each place
                    //if any values are missing we won't show the marker
                    boolean missingValue=false;
                    LatLng placeLL=null;
                    String placeName="";
                    String vicinity="";
                    int currIcon = otherIcon;
                    try{
                        //attempt to retrieve place data values
                        missingValue=false;
                        //get place at this index
                        JSONObject placeObject = placesArray.getJSONObject(p);
                        //get location section
                        JSONObject loc = placeObject.getJSONObject("geometry")
                                .getJSONObject("location");
                        //read lat lng
                        placeLL = new LatLng(Double.valueOf(loc.getString("lat")), 
                                Double.valueOf(loc.getString("lng")));  
                        //get types
                        JSONArray types = placeObject.getJSONArray("types");
                        //loop through types
                        for(int t=0; t<types.length(); t++){
                            //what type is it
                            String thisType=types.get(t).toString();
                            //check for particular types - set icons
                            if(thisType.contains("food")){
                                currIcon = foodIcon;
                                break;
                            }
                            else if(thisType.contains("bar")){
                                currIcon = drinkIcon;
                                break;
                            }
                            else if(thisType.contains("movie_theater")){
                                currIcon = shopIcon;
                                break;
                            }
                        }
                        //vicinity
                        vicinity = placeObject.getString("vicinity");
                        //name
                        placeName = placeObject.getString("name");
                    }
                    catch(JSONException jse){
                        Log.v("PLACES", "missing value");
                        missingValue=true;
                        jse.printStackTrace();
                    }
                    //if values missing we don't display
                    if(missingValue)    places[p]=null;
                    else
                        places[p]=new MarkerOptions()
                    .position(placeLL)
                    .title(placeName)
                    .icon(BitmapDescriptorFactory.fromResource(currIcon))
                    .snippet(vicinity);
                }
            }
            catch (Exception e) {
                e.printStackTrace();
            }
            if(places!=null && placeMarkers!=null){
                for(int p=0; p<places.length && p<placeMarkers.length; p++){
                    //will be null if a value was missing
                    if(places[p]!=null)
                        placeMarkers[p]=theMap.addMarker(places[p]);

            }

        }
    }   
}
    @Override
    protected void onResume() {
        super.onResume();
        if(theMap!=null){
            //get location manager
        locMan = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        //get last location
        Location lastLoc = locMan.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
        locMan.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 30000, 100, this);
        updatePlaces(lastLoc);
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        if(theMap!=null){
            locMan.removeUpdates(this);
        }
    }
}

チェックしてください...私の場所は更新されていません...近くの場所が表示されています..事前に感謝します

4

1 に答える 1

0

問題は、 への呼び出しを受け取るたびに、ロケーション マネージャーを再初期化するメソッドonLocationChanged()を呼び出していることです。updatePlaces()行はロケーション マネージャーの新しいインスタンスを返し、この新しいロケーション マネージャーlocMan = (LocationManager)getSystemService(Context.LOCATION_SERVICE);を呼び出します。getLastKnownLocation古い位置情報を返すgetLastKnownLocation必要があるため、更新が表示されない場合があります。変更リスナーによって返される新しい場所の代わりに、この場所を使用することになります。これらを初期化し、以下のように onResume で updatePlaces を呼び出すことができます:

@Override
    protected void onResume() {
        super.onResume();
        if(theMap!=null){
            //get location manager
        locMan = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        //get last location
        Location lastLoc = locMan.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
        locMan.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 30000, 100, this);
        updatePlaces(lastLoc)
        }
    }

場所の変更変更:

@Override
    public void onLocationChanged(Location location) {
        Log.v("MyMapActivity", "location changed");
        updatePlaces(location);
    }

更新場所を変更します。

private void updatePlaces(Location givenlocation){

        double lat = givenlocation.getLatitude();
        double lng = givenlocation.getLongitude();
        Toast.makeText(getApplicationContext(), lat+","+lng, Toast.LENGTH_LONG).show();
        //create LatLng
        LatLng lastLatLng = new LatLng(lat, lng);

    *****Call further steps using the above location ******

現在、Android プラットフォームの一部であるロケーション API を使用しています。また、Google Play Services の一部である新しい Google Location Services API に移行することをお勧めします。これは、位置情報の更新とバッテリーの節約を改善された方法で処理するためです。

于 2013-07-04T08:24:16.257 に答える