ArcGIS for Android LocationService异常

最近，我的Android项目从谷歌地图转到了ESRI ArcGIS，目前我正处于转型过程中。从那以后，我只遇到了一个小问题

每当我启用内置位置服务时，下面的代码就会抛出NullPointerException。而且LocationService.start调用是在try-catch块中还是在另一个线程中运行都无关紧要：应用程序只是崩溃了

下面是Activity类的一个片段：

这是它抛出的异常：

05-13 10:08:55.580: ERROR/AndroidRuntime(28355): java.lang.NullPointerException
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at com.esri.core.geometry.Envelope.<init>(Unknown Source)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at com.esri.core.map.LayerModel.setExtent(Unknown Source)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at com.esri.android.map.LayerView.onSizeChanged(Unknown Source)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at android.view.View.setFrame(View.java:7123)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at android.view.View.layout(View.java:7050)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at com.esri.android.map.MapView.onLayout(Unknown Source)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at android.view.View.layout(View.java:7056)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at android.view.View.layout(View.java:7056)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at android.view.View.layout(View.java:7056)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at android.view.ViewRoot.performTraversals(ViewRoot.java:1049)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1744)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at android.os.Looper.loop(Looper.java:143)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at android.app.ActivityThread.main(ActivityThread.java:5068)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at java.lang.reflect.Method.invokeNative(Native Method)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at java.lang.reflect.Method.invoke(Method.java:521)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
05-13 10:08:55.580: ERROR/AndroidRuntime(28355):     at dalvik.system.NativeStart.main(Native Method)

---

我做错了什么？

这可能来得有点晚，但状态可能来自其他来源。 因此，映射就是在初始化其他内容时抛出null异常的对象

 if(source == map && status == STATUS.INITIALIZED) {
                    //set up location service
                    /*
                     * The following block throws exception and the application crashes.
                     * And it doesn't matter whether I run it from another thread or in a try-catch block!
                     */
                    new Handler().post(new Runnable() {
                        @Override
                        public void run() {
                            try {
                                locationService = map.getLocationService();
                                locationService.setLocationListener(MapEsri.this);
    //                          locationService.setAccuracyCircleOn(true);
    //                          locationService.setBearing(true);
    //                          locationService.setAutoPan(true);
                                locationService.start();
                            }
                            catch(Exception e) {
                                e.printStackTrace();
                            }
                        }
                    });
                }

---

您必须为位置创建自己的侦听器您是否为其绑定了任何侦听器？locationService.setLocationListenerMapEsri.this；

 if(source == map && status == STATUS.INITIALIZED) {
                    //set up location service
                    /*
                     * The following block throws exception and the application crashes.
                     * And it doesn't matter whether I run it from another thread or in a try-catch block!
                     */
                    new Handler().post(new Runnable() {
                        @Override
                        public void run() {
                            try {
                                locationService = map.getLocationService();
                                locationService.setLocationListener(MapEsri.this);
    //                          locationService.setAccuracyCircleOn(true);
    //                          locationService.setBearing(true);
    //                          locationService.setAutoPan(true);
                                locationService.start();
                            }
                            catch(Exception e) {
                                e.printStackTrace();
                            }
                        }
                    });
                }