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我已经搜索并搜索了一个适用的答案，但我发现的所有内容都不合适。

我使用了（ http://code.tutsplus.com/tutorials/android-sdk-working-with-google-maps-displaying-places-of-interest--mobile-16145 ）上的教程来识别本地场所（餐厅、等）从我当前的位置。但是，与教程不同的是，我的本地地点没有显示。

我的清单如下：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.WreckinApp.MaJoRProduct.wbiassistant" >

<permission
    android:name="com.WreckinApp.MaJoRProduct.wbiassistant.permission.MAPS_RECEIVE"
    android:protectionLevel="signature"/>
<uses-permission android:name="com.WreckinApp.MaJoRProduct.wbiassistant.MAPS_RECEIVE"/>

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

<uses-feature
    android:glEsVersion="0x00020000"
    android:required="true" />


<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >

    <meta-data
        android:name="com.google.android.maps.v2.API_KEY"
        android:value="MAPS_API_KEY"/>
    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />

    <activity
        android:name=".splash"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".main"
        android:screenOrientation="portrait"
        android:configChanges="keyboardHidden|orientation|screenSize">
    </activity>
    <activity android:name=".contact"
        android:screenOrientation="portrait"
        android:configChanges="keyboardHidden|orientation|screenSize">
    </activity>
    <activity android:name=".map"
        android:screenOrientation="portrait"
        android:configChanges="keyboardHidden|orientation|screenSize">
    </activity>
    <activity android:name=".gallery"
        android:screenOrientation="portrait"
        android:configChanges="keyboardHidden|orientation|screenSize">
    </activity>
    <activity android:name=".link"
        android:screenOrientation="portrait"
        android:configChanges="keyboardHidden|orientation|screenSize">
    </activity>
    <activity android:name=".split"
        android:screenOrientation="portrait"
        android:configChanges="keyboardHidden|orientation|screenSize">
    </activity>


</application>

</manifest>

包含地图的活动如下：

package com.WreckinApp.MaJoRProduct.wbiassistant;

import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.util.Log;
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 java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
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.LocationManager;
import android.content.Context;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
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 android.os.AsyncTask;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;


public class map extends Activity {
private GoogleMap map;
private LocationManager locMan;
private Marker userMarker;
private int userIcon, foodIcon, drinkIcon, shopIcon, otherIcon;
private Marker[] placeMarkers;
private final int MAX_PLACES = 10;
private MarkerOptions[] places;

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

    if(map==null) {
        //map not instantiated yet
        map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
    }

    if(map != null){
        //ok - proceed
    }
    map.setMapType(GoogleMap.MAP_TYPE_NORMAL);
    placeMarkers = new Marker[MAX_PLACES];
    updatePlaces();
}
private void updatePlaces(){
    locMan = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
    Location lastLoc = locMan.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
    double lat = lastLoc.getLatitude();
    double lng = lastLoc.getLongitude();

    //update location

    LatLng lastLatLng = new LatLng(lat, lng);
    if(userMarker!=null){userMarker.remove();}
    userMarker = map.addMarker(new MarkerOptions()
            .position(lastLatLng)
            .title("You are here")
            .icon(BitmapDescriptorFactory.fromResource(userIcon))
            .snippet("Your last recorded location"));
    map.animateCamera(CameraUpdateFactory.newLatLng(lastLatLng), 3000, null);

    String types = "food|bar|store|museum|art_gallery";
    try {
        types = URLEncoder.encode(types, "UTF-8");
    } catch (UnsupportedEncodingException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }
    String placesSearchStr = "https://maps.googleapis.com/maps/api/place/nearbysearch/output?" +
            "parameters" +
            "json?location="+lat+","+lng+
            "&radius=500&sensor=true" +
            "&types=" + types +
            "AIzaSyASEbnPuqb-_Y8N_CqBfqSw9ZPVLWQt0lQ";

    new GetPlaces().execute(placesSearchStr);
}

private class GetPlaces extends AsyncTask<String, Void, String> {
    //fetch and parse place data

    @Override
    protected String doInBackground(String... placesURL) {
        //fetch places

        StringBuilder placesBuilder = new StringBuilder();

        //process search parameter string(s)
        for (String placeSearchURL : placesURL) {
            //execute search

            HttpClient placesClient = new DefaultHttpClient();
            try {
                //try to fetch the data
                HttpGet placesGet = new HttpGet(placeSearchURL);
                HttpResponse placesResponse = placesClient.execute(placesGet);
                StatusLine placeSearchStatus = placesResponse.getStatusLine();

                if (placeSearchStatus.getStatusCode() == 200) {
                    //we have an OK response
                    HttpEntity placesEntity = placesResponse.getEntity();
                    InputStream placesContent = placesEntity.getContent();
                    InputStreamReader placesInput = new InputStreamReader(placesContent);
                    BufferedReader placesReader = new BufferedReader(placesInput);
                    String lineIn;
                    while ((lineIn = placesReader.readLine()) != null) {
                        placesBuilder.append(lineIn);
                    }
                }
            }
            catch(Exception e){
                e.printStackTrace();
            }
        }
        return placesBuilder.toString();
    }
    protected void onPostExecute(String result) {
        //parse place data returned from Google Places
        if(placeMarkers!=null){
            for(int pm=0; pm<placeMarkers.length; pm++){
                if(placeMarkers[pm]!=null)
                    placeMarkers[pm].remove();
                try {
                    //parse JSON
                    JSONObject resultObject = new JSONObject(result);
                    JSONArray placesArray = resultObject.getJSONArray("results");
                    places = new MarkerOptions[placesArray.length()];
                    //loop through places
                    for (int p=0; p<placesArray.length(); p++) {
                        //parse each place
                        boolean missingValue=false;
                        LatLng placeLL=null;
                        String placeName="";
                        String vicinity="";
                        int currIcon = otherIcon;
                        try{
                            //attempt to retrieve place data values
                            missingValue=false;
                            JSONObject placeObject = placesArray.getJSONObject(p);
                            JSONObject loc = placeObject.getJSONObject("geometry").getJSONObject("location");
                            placeLL = new LatLng(
                                    Double.valueOf(loc.getString("lat")),
                                    Double.valueOf(loc.getString("lng")));
                            JSONArray types = placeObject.getJSONArray("types");
                            for(int t=0; t<types.length(); t++) {
                                //what type is it

                                String thisType = types.get(t).toString();
                                if (thisType.contains("food")) {
                                    currIcon = foodIcon;
                                    break;
                                } else if (thisType.contains("bar")) {
                                    currIcon = drinkIcon;
                                    break;
                                } else if (thisType.contains("store")) {
                                    currIcon = shopIcon;
                                    break;
                                }
                            }
                            vicinity = placeObject.getString("vicinity");
                            placeName = placeObject.getString("name");

                        }
                        catch(JSONException jse){
                            missingValue=true;
                            jse.printStackTrace();
                        }
                        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]=map.addMarker(places[p]);
                    }
                }
            }
        }

    }
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.splash, menu);
    return true;
}


@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}
}

我的 logcat 错误一遍又一遍地看起来像这样：

08-27 18:07:02.577  26474-26474/com.WreckinApp.MaJoRProduct.wbiassistant W/System.err﹕ at java.lang.reflect.Method.invokeNative(Native Method)
08-27 18:07:02.577  26474-26474/com.WreckinApp.MaJoRProduct.wbiassistant W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:515)
08-27 18:07:02.577  26474-26474/com.WreckinApp.MaJoRProduct.wbiassistant W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
08-27 18:07:02.577  26474-26474/com.WreckinApp.MaJoRProduct.wbiassistant W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
08-27 18:07:02.577  26474-26474/com.WreckinApp.MaJoRProduct.wbiassistant W/System.err﹕ at dalvik.system.NativeStart.main(Native Method)
08-27 18:07:02.577  26474-26474/com.WreckinApp.MaJoRProduct.wbiassistant W/System.err﹕ org.json.JSONException: End of input at character 0 of
08-27 18:07:02.587  26474-26474/com.WreckinApp.MaJoRProduct.wbiassistant W/System.err﹕ at org.json.JSONTokener.syntaxError(JSONTokener.java:450)
08-27 18:07:02.587  26474-26474/com.WreckinApp.MaJoRProduct.wbiassistant W/System.err﹕ at org.json.JSONTokener.nextValue(JSONTokener.java:97)
08-27 18:07:02.587  26474-26474/com.WreckinApp.MaJoRProduct.wbiassistant W/System.err﹕ at org.json.JSONObject.<init>(JSONObject.java:155)
08-27 18:07:02.587  26474-26474/com.WreckinApp.MaJoRProduct.wbiassistant W/System.err﹕ at org.json.JSONObject.<init>(JSONObject.java:172)
08-27 18:07:02.587  26474-26474/com.WreckinApp.MaJoRProduct.wbiassistant W/System.err﹕ at com.WreckinApp.MaJoRProduct.wbiassistant.map$GetPlaces.onPostExecute(map.java:176)
08-27 18:07:02.587  26474-26474/com.WreckinApp.MaJoRProduct.wbiassistant W/System.err﹕ at com.WreckinApp.MaJoRProduct.wbiassistant.map$GetPlaces.onPostExecute(map.java:130)
08-27 18:07:02.587  26474-26474/com.WreckinApp.MaJoRProduct.wbiassistant W/System.err﹕ at android.os.AsyncTask.finish(AsyncTask.java:632)
08-27 18:07:02.587  26474-26474/com.WreckinApp.MaJoRProduct.wbiassistant W/System.err﹕ at android.os.AsyncTask.access$600(AsyncTask.java:177)
08-27 18:07:02.587  26474-26474/com.WreckinApp.MaJoRProduct.wbiassistant W/System.err﹕ at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
08-27 18:07:02.587  26474-26474/com.WreckinApp.MaJoRProduct.wbiassistant W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:102)
08-27 18:07:02.587  26474-26474/com.WreckinApp.MaJoRProduct.wbiassistant W/System.err﹕ at android.os.Looper.loop(Looper.java:136)
08-27 18:07:02.587  26474-26474/com.WreckinApp.MaJoRProduct.wbiassistant W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5001)

我所认识的是 map.java:130

private class GetPlaces extends AsyncTask<String, Void, String>

和 map.java:176

JSONObject resultObject = new JSONObject(result);

但我不知道在教程中一步一步看到的每一行有什么问题。他们之前曾在测试应用程序中出现过一次，但我已经（愚蠢地）删除了它，我只需要出现本地地方而他们没有。我哪里错了？

4

2 回答 2

0

我认为您的代码没有问题。请检查您的网址。

String placesSearchStr = "https://maps.googleapis.com/maps/api/place/nearbysearch/output?" +
        "parameters" +
        "json?location="+lat+","+lng+
        "&radius=500&sensor=true" +
        "&types=" + types +
        "AIzaSyASEbnPuqb-_Y8N_CqBfqSw9ZPVLWQt0lQ";

您的 URL 包含“输出？”一词 这意味着 json 或 xml 输出，并且必须省略“参数”。它应该如下所示：

String placesSearchStr = "https://maps.googleapis.com/maps/api/place/nearbysearch/json?" +
        "location="+lat+","+lng+
        "&radius=500&sensor=true" +
        "&types=" + types +"&key=AIzaSyASEbnPuqb-_Y8N_CqBfqSw9ZPVLWQt0lQ";

希望能帮助到你。

于 2014-08-28T01:11:51.577 回答
0

在您的 while 循环中，当读取响应时，您会在存在更多行时读取它。但是您插入时没有换行符。

我不确定它是否会有所帮助，但可能会损坏 Json 编码。

           while ((lineIn = placesReader.readLine()) != null) {
                    placesBuilder.append(lineIn + "\n");
                }
于 2014-08-27T22:52:32.633 回答