arcgis for android（八）加载shape和影像

1、上一章讲了arcgis for android 入门与提高（七）加载服务arcgis for android 入门与提高（七）加载arcgis server服务_郝大大的博客-优快云博客，介绍了三种加载服务图层的方式，这节讲如何加载各类数据。

2、shape数据是最常用的数据，arcgis for android提供了提别方便的接口供我们使用，当然这个接口的权限是最高的，所以只能在开发者模式中使用。

首先我们要获取Android读取文件的权限：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.
        permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
    permissionList.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
}

把数据拷贝到设备中，设置导入数据的路径，Environment.getExternalStorageDirectory()是根目录：

String shapeFile = Environment.getExternalStorageDirectory() + "/test.shp";

3、默认的显示效果是黑色的，我们需要给它一个颜色渲染SimpleRenderer ，点、线、面符号颜色、大小用SimpleMarkerSymbol、SimpleLineSymbol、SimpleFillSymbol表示，核心代码：

private void importShape(String shapeFile) {
    ShapefileFeatureTable shapefileFeatureTable = new ShapefileFeatureTable(shapeFile);
    FeatureLayer featureLayer = new FeatureLayer(shapefileFeatureTable);
    mMapView.getMap().getOperationalLayers().add(featureLayer);
    shapefileFeatureTable.addDoneLoadingListener(new Runnable() {
        @Override
        public void run() {
            if (shapefileFeatureTable.getLoadStatus() == LoadStatus.LOADED) {
                mMapView.setViewpointGeometryAsync(shapefileFeatureTable.getExtent());
                String geoType = shapefileFeatureTable.getGeometryType().toString();
                SimpleRenderer renderer = null;
                SimpleMarkerSymbol markerSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE, Color.GREEN, 6);
                SimpleLineSymbol lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.RED, 1);
                SimpleFillSymbol fillSymbol = new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, Color.argb(70, 252, 241, 144), lineSymbol);
                if (geoType.equals("POINT")) {
                    renderer = new SimpleRenderer(markerSymbol);
                }
                if (geoType.equals("POLYLINE")) {
                    renderer = new SimpleRenderer(lineSymbol);
                }
                if (geoType.equals("POLYGON")) {
                    renderer = new SimpleRenderer(fillSymbol);
                }
                featureLayer.setRenderer(renderer);
            } else {
                String error = "Shapefile feature table failed to load: " + shapefileFeatureTable.getLoadError().toString();
                Toast.makeText(MainActivity.this, error, Toast.LENGTH_LONG).show();
            }
        }
    });
}

4、效果：

  

5、加载影像：

private void importTiff(String tiffFile) {
    Raster raster = new Raster(tiffFile);
    RasterLayer rasterLayer = new RasterLayer(raster);
    mMapView.getMap().getOperationalLayers().add(rasterLayer);
    rasterLayer.addDoneLoadingListener(new Runnable() {
        @Override
        public void run() {
            if (raster.getLoadStatus() == LoadStatus.LOADED)
                mMapView.setViewpointGeometryAsync(rasterLayer.getFullExtent());
            else {
                String error = "Raster failed to load: " + raster.getLoadError().toString();
                Toast.makeText(MainActivity.this, error, Toast.LENGTH_LONG).show();
            }
        }
    });
}

6、下一节讲解 arcgis for android 入门与提高（九）地理查询arcgis for android 入门与提高（九）地理查询 + 触摸事件_郝大大的博客-优快云博客

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