安卓智能地图开发与实施二十五：Shapefile文件的可视化与编辑 - ArcGIS Runtime SDK for Android（Version 100.2.0）

Shapefile文件的可视化与编辑


ArcGIS Runtime 100.2.0的正式发布带来个更多移动端的处理地图的能力，例如支持WMS图层、支持海图（ENC）图层，再如基于场景相机（Camera）的视域分析。同时还提供了新的统计查询API（总和，平均值，计数，最小值，最大值，标准差或方差）。而今天要描述的重点是ArcGIS Runtime 100.2.0对Shapefile数据格式的支持，当然ArcGIS Runtime 100.2.0还增加了对OGC GeoPackage格式的支持。

Shapefile文件的可视化

我们都知道Shapefile文件是Esri创造的开源空间数据格式，简单的介绍如下。

在安卓端加载Shapefile文件的关键是ShapefileFeatureTable（com.esri.arcgisruntime.data.ShapefileFeatureTable）。代码如下

private void showShapefile() {

    mainMapView = (MapView) findViewById(R.id.mapView);

    mainMapView.setAttributionTextVisible(false);

    mainArcGISMap = new ArcGISMap(new Basemap().createImageryWithLabelsVector());

    mainMapView.setMap(mainArcGISMap);

    final ShapefileFeatureTable shapefileFeatureTable = new ShapefileFeatureTable(

            getResources().getString(R.string.shapefile_path)

    );

    shapefileFeatureTable.loadAsync();

    shapefileFeatureTable.addDoneLoadingListener(new Runnable() {

        @Override

        public void run() {

            GeometryType gt = shapefileFeatureTable.getGeometryType();

            String name = shapefileFeatureTable.getTableName();

            String name1 = name;

            mainShapefileLayer = new FeatureLayer(shapefileFeatureTable);

            if (mainShapefileLayer.getFullExtent() != null) {

                mainMapView.setViewpointGeometryAsync(mainShapefileLayer.getFullExtent());

            } else {

                mainShapefileLayer.addDoneLoadingListener(new Runnable() {

                    @Override

                    public void run() {

                        mainMapView.setViewpointGeometryAsync(mainShapefileLayer.getFullExtent());

                    }

                });

            }

            mainArcGISMap.getOperationalLayers().add(mainShapefileLayer);

            startDrawing();

        }

    });





    SimpleLineSymbol lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.RED, 1.0f);

    SimpleFillSymbol fillSymbol = new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, Color.YELLOW, lineSymbol);

    SimpleRenderer renderer = new SimpleRenderer(fillSymbol);

    //mainShapefileLayer.setRenderer(renderer);

}

相比于.geodatabase文件，Shapefile文件的缺点在于只是单图层，且没有符号化，当然可以通过移动端的可视化API进行处理。

Shapefile文件的查询

ShapefileFeatureTable继承自FeatureTable，在ArcGISMap中也是通过FeatureLayer进行，数据查询也好，要素选择也好都可以通过FeatureLayer和FeatureTable实现。

mainMapView.setOnTouchListener(

        new DefaultMapViewOnTouchListener(this, mainMapView) {

            @Override

            public boolean onSingleTapConfirmed(MotionEvent e) {

                if(isSelect == true)

                {

                    Point clickPoint = mMapView.screenToLocation(new android.graphics.Point(Math.round(e.getX()), Math.round(e.getY())));

                    int tolerance = 1;

                    double mapTolerance = tolerance * mMapView.getUnitsPerDensityIndependentPixel();

                    Envelope envelope = new Envelope(clickPoint.getX() - mapTolerance, clickPoint.getY() - mapTolerance, clickPoint.getX() + mapTolerance, clickPoint.getY() + mapTolerance, mMapView.getSpatialReference());

                    QueryParameters query = new QueryParameters();

                    query.setGeometry(envelope);

                    query.setSpatialRelationship(QueryParameters.SpatialRelationship.WITHIN);

                    final ListenableFuture<FeatureQueryResult> future = mainShapefileLayer.selectFeaturesAsync(query, FeatureLayer.SelectionMode.NEW);

                    future.addDoneListener(new Runnable() {

                        @Override

                        public void run() {

                            try {

                                FeatureQueryResult result = future.get();

                                //mainShapefileLayer.getFeatureTable().deleteFeaturesAsync(result);

                                Iterator<Feature> iterator = result.iterator();

                                Feature feature;



                                int counter = 0;

                                while (iterator.hasNext()){

                                    feature = iterator.next();

                                    counter++;



                                }

                            } catch (Exception e) {

                                e.getCause();

                            }

                        }

                    });

                }



                return super.onSingleTapConfirmed(e);

            }

        }

);

Shapefile文件的编辑

只要具备移动端文件的读写能力，便可以轻松的通过FeatureLayer的相关方法进行空间数据的编辑（添加、修改、删除）。

添加操作如下：

if (mainSketchEditor.getGeometry() != null) {

    java.util.Map<String, Object> attributes = new HashMap<String, Object>();

    attributes.put("NAME", "自己画的省份");

    Feature addedFeature = mainShapefileLayer.getFeatureTable()

            .createFeature(attributes, (Polygon) mainSketchEditor.getGeometry());

    final ListenableFuture<Void> addFeatureFuture =

            mainShapefileLayer.getFeatureTable().addFeatureAsync(

                    addedFeature

            );

    mainSketchEditor.stop();

}

删除操作如下：

final ListenableFuture<FeatureQueryResult> selectResult = mainShapefileLayer.getSelectedFeaturesAsync();

selectResult.addDoneListener(new Runnable() {

    @Override

    public void run() {

        try {

            mainShapefileLayer.getFeatureTable().deleteFeaturesAsync(selectResult.get());

        }

        catch (Exception e)

        {

            e.getCause();

        }

    }

});

编辑后的结果验证 – ArcMap中查看结果：

结尾

源程序请自行下载：
链接：https://pan.baidu.com/s/1nuYHjvj 密码：kv66
若失效，可发邮件给韩源萌（polyline@126.com）索要。

文章来源：http://blog.csdn.net/allenlu2008/article/details/78863055