Question

报错信息如下

 java.lang.NullPointerException: Attempt to invoke virtual method 'double com.supermap.imobilelite.maps.BoundingBox.getLeft()' on a null object reference
        at com.supermap.imobilelite.maps.ProjectionUtil.<init>(ProjectionUtil.java:63)
        at com.supermap.imobilelite.maps.Projection.<init>(Projection.java:53)
        at com.supermap.imobilelite.maps.AbstractTileLayerView.initProjection(AbstractTileLayerView.java:209)
        at com.supermap.imobilelite.maps.MapView.reInitProjectionToLayers(MapView.java:2610)
        at com.supermap.imobilelite.maps.MapView.access$1000(MapView.java:66)
        at com.supermap.imobilelite.maps.MapView$InnerOnStatusChangedListener.onStatusChanged(MapView.java:2657)
        at com.supermap.imobilelite.maps.LayerView$2.handleMessage(LayerView.java:2750)
        at android.os.Handler.dispatchMessage(Handler.java:98)
        at android.os.Looper.loop(Looper.java:157)
        at android.app.ActivityThread.main(ActivityThread.java:5601)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:774)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)

经过多次测试，以任何方式添加第二个图层时均会报错，而且出现第二个图层即使没有添加，只要定义了，也会显示在地图中的情况，地图容器在一个Fragement中。添加图层的代码如下

  LayerView layerView = new LayerView(getActivity());
        LayerView layerView_stallite = new LayerView(getActivity());
        layerView.setURL(url1);
        layerView.setURL(url2);

        //加载地图图层
        LayerView[] layerViews=new LayerView[2];
        layerViews[0]=layerView;
        layerViews[1]=layerView_stallite;
        m_mapView.addLayers(layerViews);    //m_mapV已定义并绑定视图

第二种方法

  LayerView layerView = new LayerView(getActivity());
        LayerView layerView_stallite = new LayerView(getActivity());
        layerView.setURL(url1);
        layerView.setURL(url2);
        //设置地图缩放
        m_mapView.setBuiltInZoomControls(false);

        //加载地图图层
        m_mapView.addLayer(layerView);
        m_mapView.addLayer(layerView_stallite);

两种方法都会报同样的错误。