Angular 错误类型错误：无法读取属性'；getProjection'；未定义的

我这样做是因为我有一个简单的问题。只有我需要在Typescript代码中使用它

在以下代码中：

   googleMap.setOnCameraChangeListener(new GoogleMap.OnCameraChangeListener() {
            @Override
            public void onCameraChange(CameraPosition position) {
                LatLngBounds bounds = googleMap.getProjection().getVisibleRegion().latLngBounds;
                LatLng northeast = bounds.northeast;
                LatLng southwest = bounds.southwest;

                Context context = getApplicationContext();
                CharSequence text = "ne:"+northeast+" sw:"+southwest;
                int duration = Toast.LENGTH_SHORT;

                Toast toast = Toast.makeText(context, text, duration);
                toast.show();
            }
        });

我需要用Typescript/Nativescript代码编写，并这样编写：

  public  onCameraChange() {
            var bounds = this.gMap.getProjection().getVisibleRegion().latLngBounds;
            console.log('bounds', bounds)
            var northeast = bounds.northeast;
            console.log('northeast', northeast)
            var southwest = bounds.southwest;
            console.log('southwest', southwest)

            var context = application.android.context.getApplicationContext();
            var text = "ne:"+northeast+" sw:"+southwest;
            console.log('context,text', context,text)
        }

在her中，显示以下错误：

请你能和我分享一下如何解决这个问题吗？我想得到API要求的纬度、长度和半径，我可以从中心点得到纬度和液化天然气，但找不到获得半径的方法

更新：

  public  onCameraChange(arg) {
     this.gMap = event.object.gMap;
                    var bounds = this.gMap.getProjection().getVisibleRegion().latLngBounds;
                    console.log('bounds', bounds)
                    var northeast = bounds.northeast;
                    console.log('northeast', northeast)
                    var southwest = bounds.southwest;
                    console.log('southwest', southwest)

                    var context = application.android.context.getApplicationContext();
                    var text = "ne:"+northeast+" sw:"+southwest;
                    console.log('context,text', context,text)
                }

展示：

应用程序自动关闭

如何计算这部分的半径

为什么我的申请被关闭

---

您可能需要导入gMap并将实例添加到构造函数中

您可能需要导入gMap并将实例添加到构造函数中

您看过这个吗？尝试注释该行，找出它的确切关闭位置。可能Android Studio中的logcat会给出详细的日志，看看你是否在那里找到了相关的东西。你看过这个吗？试着评论一下这行，找出它的确切位置。可能是Android Studio中的logcat会给出详细的日志，看看你是否在那里找到了相关的内容。但是你仍然无法读取Undelinedi的属性“getProjection”，你可以获取

JS:bounds LatLngBounds{southwest=lat/lng:（-66.418115185001424，-63.11405181884765），Northwest=lat/lng:（66.41891785546429,63.11484139412641）}

但问题是不同的，直到你无法读取Undelinedi的属性“getProjection”，你才能得到

JS:bounds LatLngBounds{southwest=lat/lng:（-66.41815185001424，-63.11405181884765），Northwest=lat/lng:（66.41891785546429,63.11484139412641）}

但问题是不同的

  public  onCameraChange(arg) {
     this.gMap = event.object.gMap;
                    var bounds = this.gMap.getProjection().getVisibleRegion().latLngBounds;
                    console.log('bounds', bounds)
                    var northeast = bounds.northeast;
                    console.log('northeast', northeast)
                    var southwest = bounds.southwest;
                    console.log('southwest', southwest)

                    var context = application.android.context.getApplicationContext();
                    var text = "ne:"+northeast+" sw:"+southwest;
                    console.log('context,text', context,text)
                }

JS: bounds LatLngBounds{southwest=lat/lng: (-66.41815185001424,-63.11405181884765), northeast=lat/lng: (66.41891785546429,63.11484139412641)}
JS: northeast lat/lng: (66.41891785546429,63.11484139412641)
JS: southwest lat/lng: (-66.41815185001424,-63.11405181884765)