Android 如何将多个标记添加到GoogleMap中存储在数组中的位置

我正在编写一个Android应用程序，它将多个用户的位置存储到一个远程数据库中，然后任何用户都可以获得这些位置并将它们放在谷歌地图上

我可以成功地存储位置。我可以成功地将所有位置作为一个数组获取。我在地图上绘制它们时遇到了麻烦：应用程序总是崩溃

这是我的代码，添加标记在“在后台执行”部分的“attemptLoad”类中：

package com.paul.locations；
导入java.text.simpleDataFormat；
导入java.util.ArrayList；
导入java.util.Calendar；
导入java.util.HashMap；
导入java.util.List；
导入org.apache.http.NameValuePair；
导入org.apache.http.message.BasicNameValuePair；
导入org.json.JSONArray；
导入org.json.JSONException；
导入org.json.JSONObject；
导入com.paul.locations.JSONParser；
导入com.paul.locations.R；
导入com.google.android.gms.maps.GoogleMap；
导入com.google.android.gms.maps.MapFragment；
导入com.google.android.gms.maps.model.LatLng；
导入com.google.android.gms.maps.model.MarkerOptions；
导入android.location.LocationManager；
导入android.os.AsyncTask；
导入android.os.Bundle；
导入android.preference.PreferenceManager；
导入android.app.Activity；
导入android.app.ProgressDialog；
导入android.content.Context；
导入android.content.SharedReferences；
导入android.util.Log；
导入android.view.view；
导入android.view.view.OnClickListener；
导入android.widget.Button；
导入android.widget.Toast；
公共类位置扩展活动实现OnClickListener{
私人谷歌地图谷歌地图；
私有字符串lat=“”，lon=“”，current=“”，lati，loni；
私人按钮区，b商店；
私人花车啦，啦；
//进度对话框
私人对话；
//JSON解析器类
JSONParser JSONParser=新的JSONParser（）；
//php添加注释脚本
//本地主机：
//在您的设备上进行测试
//将本地ip改为在windows上运行CMD>ipconfig
//或者在mac的终端类型ifconfig中，查找en0或en1下的ip
私有静态最终字符串加载\u信息\u URL=”http://192.168.1.14/locations/load_infos.php";
私有静态最终字符串更新\u信息\u URL=”http://192.168.1.14/locations/update_info.php";
//在模拟器上测试：
//私有静态最终字符串POST_COMMENT_URL=”http://10.0.2.2:1234/webservice/addcomment.php";
//从真实服务器进行测试：
//私有静态最终字符串POST_COMMENT_URL=”http://www.mybringback.com/webservice/addcomment.php";
//身份证
私有静态最终字符串标记_SUCCESS=“SUCCESS”；
私有静态最终字符串标记_MESSAGE=“MESSAGE”；
私有静态最终字符串标记_LON=“LON”；
私有静态最终字符串标记_LAT=“LAT”；
私有静态最终字符串标记\u USERNAME=“USERNAME”；
私有静态最终字符串标记_POSTS=“POSTS”；
私有静态最终字符串标记\u TIME=“TIME”；
私有静态最终字符串标记\u ID=“ID”；
//产品JSONArray
JSONArray产品=null；
ArrayList productsList；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.map）；
setUpMap（）；
//ListView的Hashmap
productsList=新的ArrayList（）；
bLoad=（按钮）findViewById（R.id.bLoad）；
bLoad.setOnClickListener（this）；
b存储=（按钮）findViewById（R.id.b存储）；
bStore.setOnClickListener（this）；
}
@凌驾
公共void onClick（视图v）{
//TODO自动生成的方法存根
开关（v.getId（））{
案例R.id.bLoad：
新建AttemptLoad（）.execute（）；
打破
案例R.id.B存储：
LocationManager lm=（LocationManager）getSystemService（Context.LOCATION\u服务）；
android.location.location location=lm.getlastnownlocation（LocationManager.GPS\u提供程序）；
lon=Double.toString（location.getLongitude（））；
lat=Double.toString（location.getLatitude（））；
系统输出打印LN（lon+“，”+lat）；
Calendar c=Calendar.getInstance（）；
SimpleDataFormat df=新的SimpleDataFormat（“HH:mm:ss”）；
current=df.format（c.getTime（））；
系统输出打印项次（当前）；
新的AttemptStore（）.execute（）；
打破
违约：
打破
}
}
类AttemptLoad扩展了AsyncTask{
@凌驾
受保护的void onPreExecute（）{
super.onPreExecute（）；
pDialog=新建进度对话框（Location.this）；
setMessage（“正在尝试加载位置…”）；
pDialog.setUndeterminate（假）；
pDialog.setCancelable（真）；
pDialog.show（）；
}
@凌驾
受保护的字符串doInBackground（字符串…参数）{
//TODO自动生成的方法存根
//实例化arraylist以包含所有JSON数据。
//我们将使用一组键值对，引用
//例如，json元素名和内容，
//在标签上留言，在内容上写上“我太棒了”。
//建筑参数
List params1=new ArrayList（）；
//从URL获取JSON字符串
JSONObject json=jsonParser.makeHttpRequest（加载信息URL，“GET”，参数1）；
//检查日志cat中的JSON响应
Log.d（“所有产品：，json.toString（））；
//在解析JSON内容时，我们可能应该
//尝试捕获任何异常：
试一试{
//检查成功标签
int success=json.getInt（TAG_success）；
如果（成功==1）{
//发现的产品
//通用电气
package com.paul.locations;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashMap;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import com.paul.locations.JSONParser;
import com.paul.locations.R;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.SharedPreferences;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;


public class Location extends Activity implements OnClickListener {

    private GoogleMap googlemap;
    private String lat="", lon="", current = "", lati, loni;
    private Button  bLoad, bStore;
    private Float la, lo;

     // Progress Dialog
    private ProgressDialog pDialog;

    // JSON parser class
    JSONParser jsonParser = new JSONParser();

    //php add a comment script

    //localhost :  
    //testing on your device
    //put your local ip instead,  on windows, run CMD > ipconfig
    //or in mac's terminal type ifconfig and look for the ip under en0 or en1
    private static final String LOAD_INFO_URL = "http://192.168.1.14/locations/load_infos.php";
    private static final String UPDATE_INFO_URL = "http://192.168.1.14/locations/update_info.php";


    //testing on Emulator:
    //private static final String POST_COMMENT_URL = "http://10.0.2.2:1234/webservice/addcomment.php";

    //testing from a real server:
    //private static final String POST_COMMENT_URL = "http://www.mybringback.com/webservice/addcomment.php";

    //ids
    private static final String TAG_SUCCESS = "success";
    private static final String TAG_MESSAGE = "message";
    private static final String TAG_LON = "lon";
    private static final String TAG_LAT = "lat";
    private static final String TAG_USERNAME = "username";
    private static final String TAG_POSTS = "posts";
    private static final String TAG_TIME = "time";
    private static final String TAG_ID = "id";

    // products JSONArray
    JSONArray products = null;

    ArrayList<HashMap<String, String>> productsList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

            setContentView(R.layout.map);
            setUpMap();
            // Hashmap for ListView
            productsList = new ArrayList<HashMap<String, String>>();


        bLoad = (Button)findViewById(R.id.bLoad);
        bLoad.setOnClickListener(this);
        bStore = (Button)findViewById(R.id.bStore);
        bStore.setOnClickListener(this);        
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch (v.getId()) {
        case R.id.bLoad:
            new AttemptLoad().execute();
            break;
        case R.id.bStore:
            LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE); 
            android.location.Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            lon = Double.toString(location.getLongitude());
            lat = Double.toString(location.getLatitude());
            System.out.println(lon + ", " + lat);
            Calendar c = Calendar.getInstance();
            SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss");
            current = df.format(c.getTime());
            System.out.println(current);
            new AttemptStore().execute();
            break;

        default:
            break;
        }
    }

    class AttemptLoad extends AsyncTask<String, String, String> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(Location.this);
            pDialog.setMessage("Attempting to load locations...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        @Override
        protected String doInBackground(String... params) {
            // TODO Auto-generated method stub
            // Instantiate the arraylist to contain all the JSON data.
            // we are going to use a bunch of key-value pairs, referring
            // to the json element name, and the content, for example,
            // message it the tag, and "I'm awesome" as the content.

            // Building Parameters
                        List<NameValuePair> params1 = new ArrayList<NameValuePair>();
                        // getting JSON string from URL
                        JSONObject json = jsonParser.makeHttpRequest(LOAD_INFO_URL, "GET", params1);

                        // Check your log cat for JSON reponse
                        Log.d("All Products: ", json.toString());

            // when parsing JSON stuff, we should probably
            // try to catch any exceptions:
            try {

                // Checking for SUCCESS TAG
                int success = json.getInt(TAG_SUCCESS);

                if (success == 1) {
                    // products found
                    // Getting Array of Products
                    products = json.getJSONArray(TAG_POSTS);

                    // looping through All Products
                    for (int i = 0; i < products.length(); i++) {
                        JSONObject c = products.getJSONObject(i);

                        // Storing each json item in variable
                        loni = c.getString(TAG_LON);
                        String username = c.getString(TAG_USERNAME);
                        lati = c.getString(TAG_LAT);
                        String time = c.getString(TAG_TIME);
                        String id = c.getString(TAG_ID);
                        // creating new HashMap
                        HashMap<String, String> map = new HashMap<String, String>();

                        // adding each child node to HashMap key => value
                        map.put(TAG_LON, loni);
                        map.put(TAG_LAT, lati);
                        map.put(TAG_USERNAME, username);
                        map.put(TAG_TIME, time);
                        map.put(TAG_ID, id);

                        // adding HashList to ArrayList
                        productsList.add(map);


                        la = Float.valueOf(lati);
                        lo = Float.valueOf(loni);


                        System.out.println(la);
                        System.out.println(lo);

                        //this is where i try to put all the markers on the map and where the app crashes
                        googlemap.addMarker(new MarkerOptions()
                        .position(new LatLng(la, lo))
                        .title("Hello world"));

                }
                }       

            } catch (JSONException e) {
                e.printStackTrace();
            }

            return null;
        }

        protected void onPostExecute(String file_url) {
            // dismiss the dialog once product deleted
            pDialog.dismiss();
            if (file_url != null){
                Toast.makeText(Location.this, file_url, Toast.LENGTH_LONG).show();
            }
        }
    }

    class AttemptStore extends AsyncTask<String, String, String> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(Location.this);
            pDialog.setMessage("Attempting to store your location...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        @Override
        protected String doInBackground(String... args) {
            // TODO Auto-generated method stub
            String success;

            SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(Location.this);
            String post_username = sp.getString("username", "anon");

            try {
                // Building Parameters
                List<NameValuePair> params1 = new ArrayList<NameValuePair>();
                params1.add(new BasicNameValuePair("username", post_username));
                params1.add(new BasicNameValuePair("lat", lat));
                params1.add(new BasicNameValuePair("lon", lon));
                params1.add(new BasicNameValuePair("time", current));

                Log.d("request!", "starting");

                //Posting user data to script 
                JSONObject json = jsonParser.makeHttpRequest(
                        UPDATE_INFO_URL, "POST", params1);

                // full json response
                Log.d("Store location attempt", json.toString());

                // json success element
                success = json.getString(TAG_SUCCESS);
                if(success.equals("SUCCESS")) {
                    Log.d("Location Stored!", json.toString());    
                    finish();
                    return json.getString(TAG_MESSAGE);
                }else{
                    Log.d("Storing Location Failure!", json.getString(TAG_MESSAGE));
                    return json.getString(TAG_MESSAGE);
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }           
            return null;
        }

        protected void onPostExecute(String file_url) {
            // dismiss the dialog once product deleted
            pDialog.dismiss();
            if (file_url != null){
                Toast.makeText(Location.this, file_url, Toast.LENGTH_LONG).show();
            }
        }
    }

    private void setUpMap() {
        if(googlemap == null){
            googlemap = ((MapFragment)getFragmentManager().findFragmentById(R.id.map)).getMap();

            if(googlemap != null){
                //code to initialize the map
                googlemap.setMyLocationEnabled(true);
            }
        }
    }   
}

I/System.out(19285): -117.21224441, 32.75089894
I/System.out(19285): 13:18:33
D/request!(19285): starting
I/Adreno200-EGLSUB(19285): <ConfigWindowMatch:2087>: Format RGBA_8888.
D/Store location attempt(19285): {"message":"Post Successfully  Added!","success":1}
D/Storing Location Failure!(19285): Post Successfully Added!
I/Adreno200-EGLSUB(19285): <ConfigWindowMatch:2087>: Format RGBA_8888.
D/All Products:(19285): {"posts":[{"id":"1","time":"13:18:33","lon":"-117.21224441","username":"paul","lat":"32.75089894"},{"id":"2","time":"01:00:30","lon":"13","lat":"13.01"},{"id":"3","time":"12:00:59","lon":"12.51","username":"ed","lat":"12.52"},{"id":"4","time":"14:00:00","lon":"20","username":"eric","lat":"20"},{03:03","lon":"17.01","username":"sumner","lat":"16.01"}],"success":1}
I/System.out(19285): 32.7509
I/System.out(19285): -117.21224
W/dalvikvm(19285): threadid=28: thread exiting with uncaught exception (group=0x41077438)

E/AndroidRuntime(19285): FATAL EXCEPTION: AsyncTask #3
E/AndroidRuntime(19285): java.lang.RuntimeException: An error occured while executing doInBackground()
E/AndroidRuntime(19285):    at android.os.AsyncTask$3.done(AsyncTask.java:299)
E/AndroidRuntime(19285):    at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
E/AndroidRuntime(19285):    at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
E/AndroidRuntime(19285):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
E/AndroidRuntime(19285):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
E/AndroidRuntime(19285):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
E/AndroidRuntime(19285):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
E/AndroidRuntime(19285):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
E/AndroidRuntime(19285):    at java.lang.Thread.run(Thread.java:856)

E/AndroidRuntime(19285): Caused by: java.lang.IllegalStateException: Not on the main thread
E/AndroidRuntime(19285):    at maps.as.i.b(Unknown Source)
E/AndroidRuntime(19285):    at maps.am.g.b(Unknown Source)
E/AndroidRuntime(19285):    at maps.ah.an.a(Unknown Source)
E/AndroidRuntime(19285):    at bgc.onTransact(SourceFile:167)
E/AndroidRuntime(19285):    at android.os.Binder.transact(Binder.java:326)
E/AndroidRuntime(19285):    at com.google.android.gms.maps.internal.IGoogleMapDelegate$a$a.addMarker(Unknown Source)
E/AndroidRuntime(19285):    at com.google.android.gms.maps.GoogleMap.addMarker(Unknown Source)
E/AndroidRuntime(19285):    at com.paul.locations.Location$AttemptLoad.doInBackground(Location.java:194)
E/AndroidRuntime(19285):    at com.paul.locations.Location$AttemptLoad.doInBackground(Location.java:1)
E/AndroidRuntime(19285):    at android.os.AsyncTask$2.call(AsyncTask.java:287)
E/AndroidRuntime(19285):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
E/AndroidRuntime(19285):    ... 5 more
I/Choreographer(19285): Skipped 474 frames!  The application may be doing too much work on its main thread.

W/SurfaceView(19285): CHECK surface infomation creating=false formatChanged=false sizeChanged=false visible=false visibleChanged=true surfaceChanged=true e redrawNeeded=false left=false top=false
E/WindowManager(19285): Activity com.paul.locations.Location has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4243bb10 that was e
E/WindowManager(19285): android.view.WindowLeaked: Activity com.paul.locations.Location has leaked window com.android.internal.policy.impl.w@4243bb10 that was originally added here
E/WindowManager(19285):     at android.view.ViewRootImpl.<init>(ViewRootImpl.java:408)
E/WindowManager(19285):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:311)
E/WindowManager(19285):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:224)
E/WindowManager(19285):     at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:149)
E/WindowManager(19285):     at android.view.Window$LocalWindowManager.addView(Window.java:552)
E/WindowManager(19285):     at android.app.Dialog.show(Dialog.java:277)
E/WindowManager(19285):     at com.paul.locations.Location$AttemptLoad.onPreExecute(Location.java:131)
E/WindowManager(19285):     at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
E/WindowManager(19285):     at android.os.AsyncTask.execute(AsyncTask.java:534)
E/WindowManager(19285):     at com.paul.locations.Location.onClick(Location.java:102)
E/WindowManager(19285):     at android.view.View.performClick(View.java:4203)
E/WindowManager(19285):     at android.view.View$PerformClick.run(View.java:17189)
E/WindowManager(19285):     at android.os.Handler.handleCallback(Handler.java:615)
E/WindowManager(19285):     at android.os.Handler.dispatchMessage(Handler.java:92)
E/WindowManager(19285):     at android.os.Looper.loop(Looper.java:137)
E/WindowManager(19285):     at android.app.ActivityThread.main(ActivityThread.java:4950)
E/WindowManager(19285):     at java.lang.reflect.Method.invokeNative(Native Method)
E/WindowManager(19285):     at java.lang.reflect.Method.invoke(Method.java:511)
E/WindowManager(19285):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1004)
E/WindowManager(19285):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:771)
E/WindowManager(19285):     at dalvik.system.NativeStart.main(Native Method)

googlemap.addMarker(new MarkerOptions()    
.position(new LatLng(la, lo))   
.title("Hello world"));