崩溃对谷歌地图

Question

添加标记我有这样的方法：

 class getuser extends AsyncTask<String, String, String> { 
    protected String doInBackground(String... args) { 
     int success; 
     try { 
      List<NameValuePair> params = new ArrayList<NameValuePair>(); 
      params.add(new BasicNameValuePair("ID", ID)); 
      JSONObject json = jsonParser.makeHttpRequest(url_user_detials, "GET", params); 
      Log.d("Single user Details", json.toString()); 
      success = json.getInt(TAG_SUCCESS); 
      if (success == 1) { 
       JSONArray userObj = json.getJSONArray("user"); 
       JSONObject user = userObj.getJSONObject(0); 
       String ln = user.getString("longg"); 
       String lt = user.getString("latt"); 
       String fn = user.getString("fname"); 
       String lna = user.getString("lname"); 
       String ph = user.getString("phone"); 

       username=fn+" "+lna; 
       userphone=ph+""; 
       userlat= Double.parseDouble(lt); 
       userlong= Double.parseDouble(ln); 

       marker = new MarkerOptions().position(new LatLng(userlat, userlong)); 
       marker.icon(BitmapDescriptorFactory.fromResource(R.drawable.marker)); 
       map.addMarker(marker); 
      } else { 
      } 
     } catch (JSONException e) { 
      e.printStackTrace(); 
     } 
     return null; 
    } 

从数据库中获取一些值，并把它放在谷歌地图标记。我在这个部分有错误：

 marker = new MarkerOptions().position(new LatLng(userlat, userlong)); 
       marker.icon(BitmapDescriptorFactory.fromResource(R.drawable.marker)); 
       map.addMarker(marker); 

我没有看到有什么问题吗？

我得到的错误是：

 04-25 20:22:55.330 24534-29164/com.example.hatim.maps D/Single user Details: {"success":1,"user":[{"ID":"1223456789","fname":"lama","lname":"tat","phone":"2587598","longg":"46.739004409794056","latt":"24.729458546415405"}]} 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime: Process: com.example.hatim.maps, PID: 24534 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime: java.lang.RuntimeException: An error occurred while executing doInBackground() 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at android.os.AsyncTask$3.done(AsyncTask.java:309) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at java.util.concurrent.FutureTask.setException(FutureTask.java:223) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at java.util.concurrent.FutureTask.run(FutureTask.java:242) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at java.lang.Thread.run(Thread.java:818) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime: Caused by: java.lang.IllegalStateException: Not on the main thread 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at maps.ce.i.b(Unknown Source) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at maps.db.c.a(Unknown Source) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at maps.ei.bu.a(Unknown Source) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at com.google.android.gms.maps.internal.e$a.onTransact(:com.google.android.gms.alldynamite:167) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at android.os.Binder.transact(Binder.java:387) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at com.google.android.gms.maps.internal.IGoogleMapDelegate$zza$zza.addMarker(Unknown Source) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at com.google.android.gms.maps.GoogleMap.addMarker(Unknown Source) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at com.example.hatim.maps.SearchResutl$getuser.doInBackground(SearchResutl.java:181) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at com.example.hatim.maps.SearchResutl$getuser.doInBackground(SearchResutl.java:156) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at android.os.AsyncTask$2.call(AsyncTask.java:295) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)  
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)  
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)  
     04-25 20:22:55.350 24534-29164/com.example.hatim.maps E/AndroidRuntime:  at java.lang.Thread.run(Thread.java:818)  

有人可以帮我解决这个问题？提前致谢。

Answer 1

您无法从后台线程更新UI。要更新UI或向地图添加标记，请使用onPostExecute方法。

runOnUiThread(new Runnable() { 
      @Override 
      public void run() { 
       // your UI updation 
      } 
     }); 

您正在使用的AsyncTask你也可以使用，然后在onPostExecute method.Update如下

class getuser extends AsyncTask<String, String, LatLng> { 

     @Override 
     protected LatLng doInBackground(String... strings) { 
      int success; 
      try { 
       List<NameValuePair> params = new ArrayList<NameValuePair>(); 
       params.add(new BasicNameValuePair("ID", ID)); 
       JSONObject json = jsonParser.makeHttpRequest(url_user_detials, "GET", params); 
       Log.d("Single user Details", json.toString()); 
       success = json.getInt(TAG_SUCCESS); 
       if (success == 1) { 
        JSONArray userObj = json.getJSONArray("user"); 
        JSONObject user = userObj.getJSONObject(0); 
        String ln = user.getString("longg"); 
        String lt = user.getString("latt"); 
        String fn = user.getString("fname"); 
        String lna = user.getString("lname"); 
        String ph = user.getString("phone"); 

        username=fn+" "+lna; 
        userphone=ph+""; 
        userlat= Double.parseDouble(lt); 
        userlong= Double.parseDouble(ln); 

        return new LatLng(userlat, userlong); 

       } else { 
       } 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 
      return null; 
     } 

     @Override 
     protected void onPostExecute(LatLng latLng) { 
      if(latLng != null){ 
       marker = new MarkerOptions().position(latLng); 
       marker.icon(BitmapDescriptorFactory.fromResource(R.drawable.marker)); 
       map.addMarker(marker); 
      } 


     } 
    }