Android Google 地图实用程序 - onClusterClick 导致 NullPointerException 错误

Question

用 Nativescript 编写应用程序。以下设置工作正常，没有错误：

// initialize cluster manager
dis.cluster_manager = new dis.clustering.ClusterManager(app.android.context, dis.gMap);
// Instantiate the cluster manager algorithm as is done in the ClusterManager, so we can access cluster items themselves, rather than cluster markers
dis.cluster_manager_algorithm = new dis.clustering.algo.NonHierarchicalDistanceBasedAlgorithm();
dis.cluster_manager.setAlgorithm(dis.cluster_manager_algorithm);

var CustomClusterRenderer = dis.clustering.view.DefaultClusterRenderer.extend({
    //constructor
    init: function () {},
    onBeforeClusterItemRendered: function (item, markerOptions) {
        console.log("onBeforeClusterItemRendered");
    },
    onBeforeClusterRendered: function (cluster, markerOptions) {
        console.log("onBeforeClusterRendered!!!!!!!!!!");
    }
});

dis.cluster_renderer = new CustomClusterRenderer(app.android.context, dis.gMap, dis.cluster_manager);
dis.cluster_renderer.setMinClusterSize(1);

dis.cluster_manager.setRenderer(dis.cluster_renderer);

dis.gMap.setOnCameraIdleListener(dis.cluster_manager);

// must be called after every unit add/remove
dis.cluster_manager.cluster();

现在，我想听 "on cluster clicks" 和 "on cluster item clicks"。添加以下内容：

dis.gMap.setOnMarkerClickListener(dis.cluster_manager);

dis.cluster_manager.setOnClusterClickListener(new dis.clustering.ClusterManager.OnClusterClickListener({
    onClusterClick: function(cluster) {
        console.log("onClusterClick");
    }
}));

dis.cluster_manager.setOnClusterItemClickListener(new dis.clustering.ClusterManager.OnClusterItemClickListener({
    onClusterItemClick: function(item) {
        console.log("onClusterItemClick");
    }
}));

它编译并运行良好，也就是说，当我单击集群标记或集群项目标记时，我得到了适当的 console.log，但在应用程序崩溃后我立即收到此错误：

java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.langBoolean.booleanValue()' on a null object reference

有什么想法吗？

Answer 1

太好了，浪费了 2 天时间，想知道为什么源代码中的函数该死的具有布尔类型：

public interface OnClusterClickListener<T extends ClusterItem> {
   public boolean onClusterClick(Cluster<T> cluster);
}

事实证明，因为它需要一个布尔值。没脑子...

dis.cluster_manager.setOnClusterClickListener(new dis.clustering.ClusterManager.OnClusterClickListener({
    onClusterClick: function(cluster) {
        console.log("onClusterClick");
        return true;
    }
}));

Android Google 地图实用程序 - onClusterClick 导致 NullPointerException 错误

Android Google Maps Utility - onClusterClick causes NullPointerException error

android

google-maps

nullpointerexception

nativescript