【问题标题】:IllegalStateException when creating markers on google map在谷歌地图上创建标记时出现 IllegalStateException
【发布时间】:2015-01-30 11:56:17
【问题描述】:

您好,我正在尝试在 Google 地图 v2 上显示一些标记点。一切都很好,直到我发现这个错误。出于某种原因,如果我加载带有 2 个指针的地图,然后关闭它并再次重新加载,我会收到以下消息:

“IllegalStateException 没有包含点”

当我调用时出现此错误:

 LatLngBounds bounds = builder.build();

这就是我在地图上放置点的方式:

    // Point the map's listeners at the listeners implemented by the cluster
    // manager.

    googleMap.setOnMarkerClickListener(mClusterManager);

    builder = new LatLngBounds.Builder();

    for (Ad ad : Constants._results)
    {
        builder.include(new LatLng(ad.getLat(), ad.getLon()));
    }

    googleMap.setOnCameraChangeListener(new GoogleMap.OnCameraChangeListener() {
        @Override
        public void onCameraChange(CameraPosition cameraPosition)
        {
            int padding = 50; // offset from edges of the map in pixels
            try{
                LatLngBounds bounds = builder.build();
                CameraUpdate cu = CameraUpdateFactory.newLatLngBounds(bounds, padding);
                googleMap.moveCamera(cu);
                googleMap.setOnCameraChangeListener(mClusterManager);
            }catch (Exception e)
            {
                e.printStackTrace();
            }
        }
    });

有人可以帮忙吗?

LogCat:

-30 14:11:11.267  20651-20874/com.myapp.user E/com.newrelic.agent.android﹕ Error in fireOnHarvestFinalize
java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:806)
        at java.util.HashMap$EntryIterator.next(HashMap.java:843)
        at java.util.HashMap$EntryIterator.next(HashMap.java:841)
        at com.newrelic.agent.android.metric.MetricStore.getAllByScope(MetricStore.java:63)
        at com.newrelic.agent.android.metric.MetricStore.getAllUnscoped(MetricStore.java:74)
        at com.newrelic.agent.android.harvest.HarvestDataValidator.ensureActivityNameMetricsExist(HarvestDataValidator.java:41)
        at com.newrelic.agent.android.harvest.HarvestDataValidator.onHarvestFinalize(HarvestDataValidator.java:15)
        at com.newrelic.agent.android.harvest.Harvester.fireOnHarvestFinalize(Harvester.java:580)
        at com.newrelic.agent.android.harvest.Harvester.execute(Harvester.java:271)
        at com.newrelic.agent.android.harvest.HarvestTimer.tick(HarvestTimer.java:73)
        at com.newrelic.agent.android.harvest.HarvestTimer.tickIfReady(HarvestTimer.java:56)
        at com.newrelic.agent.android.harvest.HarvestTimer.run(HarvestTimer.java:32)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:279)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:152)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
        at java.lang.Thread.run(Thread.java:841)

【问题讨论】:

    标签: android google-maps illegalstateexception


    【解决方案1】:

    我认为你的问题出在这里

     for (Ad ad : Constants._results)
        {
            builder.include(new LatLng(ad.getLat(), ad.getLon()));
        }
    

    Constants._results 必须为空,因此您的构建器中没有 LatLng 点。调试检查。

    【讨论】:

      【解决方案2】:

      在 API 中,我们发现:

      public LatLngBounds (LatLng south, LatLng Southeast):如果东北角的纬度低于西南角的纬度,则 IllegalArgumentException。

      在您的代码中,当计算边界的列表为空时会启动异常:

      LatLngBounds.Builder builder = LatLngBounds.builder();
      for(ModelLatLngDisplay p: yourList)
      {
          builder = builder.include(p.latLng);
      }
      return builder.build();
      

      【讨论】:

        【解决方案3】:

        在 UI 线程上运行标记任务。

        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                //Add your marker here...
            }
        });
        

        【讨论】:

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