arcgis for android（九）地理查询 + 触摸事件

╰+攻爆jí腚メ 2022-09-09 12:44 297阅读 0赞

1、上一章讲了arcgis for android 入门与提高（八）加载shape和影像，[arcgis for android 入门与提高（八）加载shape和影像\_郝大大的博客-CSDN博客][arcgis for android _shape_-CSDN]，这节讲如何查询**shape**自带的属性，用消息框显示出来。

2、本节内容用到了上节讲的加载shape，我们把数据加载进来，重写**触摸的单击事件和长按事件**，当单击的时候清除上次查询的内容，当长按图斑的时候显示属性值：

定义全局变量：

private FeatureLayer mFeatureLayer;
    private Callout mCallout;

导入数据：

private void importShape(String shapeFile) {
        ShapefileFeatureTable shapefileFeatureTable = new ShapefileFeatureTable(shapeFile);
        mFeatureLayer = new FeatureLayer(shapefileFeatureTable);
        //mFeatureLayer.setSelectionWidth(2);
        //mFeatureLayer.setSelectionColor(Color.RED);
        mMapView.getMap().getOperationalLayers().add(mFeatureLayer);
        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);
                    }
                    mFeatureLayer.setRenderer(renderer);
                } else {
                    String error = "Shapefile feature table failed to load: " + shapefileFeatureTable.getLoadError().toString();
                    Toast.makeText(MainActivity.this, error, Toast.LENGTH_LONG).show();
                }
            }
        });
    }

触摸事件：

String shapeFile = Environment.getExternalStorageDirectory() + "/test.shp";
    importShape(shapeFile);
    mCallout = mMapView.getCallout();
    mMapView.setOnTouchListener(new DefaultMapViewOnTouchListener(this, mMapView) {
        //单击事件
        @Override
        public boolean onSingleTapConfirmed(MotionEvent e) {
            if (mCallout.isShowing()) {
                mCallout.dismiss();
            }
            mFeatureLayer.clearSelection();
            return super.onSingleTapConfirmed(e);
        }
    
        //长按事件
        @Override
        public void onLongPress(MotionEvent e) {
            super.onLongPress(e);
    
            android.graphics.Point screenPoint = new android.graphics.Point(Math.round(e.getX()), Math.round(e.getY()));
            Point clickPoint = mMapView.screenToLocation(screenPoint);// 屏幕坐标转地理坐标
    
            int tolerance = 10;
            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);// 设置查询范围
            final ListenableFuture<FeatureQueryResult> featureQueryResultFuture = mFeatureLayer.selectFeaturesAsync(query, FeatureLayer.SelectionMode.NEW);
    
            featureQueryResultFuture.addDoneListener(new Runnable() {
                @Override
                public void run() {
                    try {
                        FeatureQueryResult featureQueryResult = featureQueryResultFuture.get();
                        // create a textview to display field values
                        TextView calloutContent = new TextView(getApplicationContext());
                        calloutContent.setTextColor(Color.BLACK);
                        calloutContent.setSingleLine(false);
                        calloutContent.setVerticalScrollBarEnabled(true);
                        calloutContent.setScrollBarStyle(View.SCROLLBARS_INSIDE_INSET);
                        calloutContent.setMovementMethod(new ScrollingMovementMethod());
                        calloutContent.setLines(5);
                        Iterator<Feature> iterator = featureQueryResult.iterator();
                        Feature feature;
                        while (iterator.hasNext()) {
                            feature = iterator.next();
                            // create a Map of all available attributes as name value pairs
                            Map<String, Object> attr = feature.getAttributes();
                            Set<String> keys = attr.keySet();
                            for (String key : keys) {
                                Object value = attr.get(key);
                                calloutContent.append(key + "：" + value.toString()+ "\n");
                            }
                            // center the mapview on selected feature
                            Envelope envelope = feature.getGeometry().getExtent();
                            mMapView.setViewpointGeometryAsync(envelope, 200);
                            // show callout
                            mCallout.setLocation(envelope.getCenter());
                            mCallout.setContent(calloutContent);
                            mCallout.show();
                        }
                    } catch (Exception e1) {
                        String error = "Select feature failed: " + e1.getMessage();
                        Toast.makeText(MainActivity.this, error, Toast.LENGTH_LONG).show();
    
                    }
                }
            });
    
        }
    
    
    });

3、效果：

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5LmL5LmO6ICF5Lmf5ZOm_size_15_color_FFFFFF_t_70_g_se_x_16][]

[arcgis for android _shape_-CSDN]: https://blog.csdn.net/HB_Programmer/article/details/120031867
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5LmL5LmO6ICF5Lmf5ZOm_size_15_color_FFFFFF_t_70_g_se_x_16]: /images/20220829/caee0cfeff564715b47bc6945d448861.png