在 google 地图上创建标记时出现 IllegalStateException

Question

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它，我会收到此消息：

"IllegalStateException no included points"

当我调用时出现此错误：

 LatLngBounds bounds = builder.build();

这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();
            }
        }
    });

有人能帮忙吗？

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$ScheduledFutureTask.access1(ScheduledThreadPoolExecutor.java:152)
        at java.util.concurrent.ScheduledThreadPoolExecutor$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)

Answer 1

运行 UI 线程上的标记任务。

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

Answer 2

在API中，我们发现：

public LatLngBounds (LatLng southwest, LatLng northeast): IllegalArgumentException if the latitude of the northeast corner is below the latitude of the southwest corner.

在您的代码中，当计算边界的列表为空时启动异常：

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

Answer 3

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。

在 google 地图上创建标记时出现 IllegalStateException

IllegalStateException when creating markers on google map

android

google-maps

illegalstateexception