本文档详细介绍了如何使用ArcGIS for Android进行空间查询，包括查询地图上点是否在特定范围内，以及根据地名搜索地理位置。示例代码展示了如何执行地名搜索任务，获取地理位置并将其显示在地图上，同时提供了缩放和坐标转换功能。
arcgis for android 参数设置：
//查询点击地图上任意点判断是否在一个范围内(地图坐标用的大地坐标)
Point point = mapView.toMapPoint(x, y); //投影坐标转换成经纬度 Point wgsPoint = (Point) GeometryEngine.project(point, mapView.getSpatialReference(), SpatialReference.create(4326));
QueryParameters qParameters = new QueryParameters(); //创建查询参数对象 SpatialReference sr = SpatialReference.create(4326);//设置空间参考坐标系 Envelope envelope = new Envelope(wgsPoint);//后面2个参数指的是点的高和低 qParameters.setGeometry(envelope);//设置识别位置 qParameters.setOutSpatialReference(sr);//设置输出坐标系 qParameters.setReturnGeometry(true);//指定是否返回几何对象 qParameters.setSpatialRelationship(SpatialRelationship.WITHIN); //需要指定关系
//显示一个面的中心
Polygon polygon = (Polygon) feature.getGeometry(); Polygon poly = new Polygon();//创建多边形对象 //获取面的中心 Point pyPoint = GeometryEngine.getLabelPointForPolygon(polygon, mapView.getSpatialReference()); //经纬度转换成投影坐标 pyPoint = (Point) GeometryEngine.project(pyPoint, SpatialReference.create(4326), mapView.getSpatialReference()); for (int i = 0; i < polygon.getPointCount(); i++) { Point wgsPoint = polygon.getPoint(i); Point point = (Point) GeometryEngine.project(wgsPoint, SpatialReference.create(4326), mapView.getSpatialReference()); if (i == 0) { poly.startPath(point); } else if (i == polygon.getPointCount() - 1) { poly.lineTo(poly.getPoint(0));//多边形是闭合的因此最后我们还要添加初始点的位置 } else { poly.lineTo(point); } } SimpleFillSymbol symbol = new SimpleFillSymbol(Color.RED); Graphic graphic = new Graphic(poly, symbol, feature.getAttributes()); mPoythLayer.addGraphic(graphic);
//********************************************************根据地名搜索*******************************************************************
/**
* 根据地名查询经纬度*/
private void searchPlace() {
String address = etSearch.getText().toString().trim();
//
LocatorFindParameters findParams = new LocatorFindParameters(address);
// Use the centre of the current map extent as the find location point
findParams.setLocation(mapView.getCenter(), mapView.getSpatialReference());
// Calculate distance for find operation
Envelope mapExtent = new Envelope();
mapView.getExtent().queryEnvelope(mapExtent); // assume map is in metres, other units wont work, double current envelope double distance = (mapExtent != null && mapExtent.getWidth() > 0) ? mapExtent.getWidth() * 2 : 10000; findParams.setDistance(distance); findParams.setMaxLocations(2);
// Set address spatial reference to match map
findParams.setOutSR(mapView.getSpatialReference());
// executeLocatorTask(findParams);
if (task != null && AsyncTask.Status.RUNNING == task.getStatus()) {
task.cancel(true);
}
new LocatorAsyncTask().execute(findParams);
}
/**
* 根据地名搜索市政府的地理位置
*/
private class LocatorAsyncTask extends AsyncTask<LocatorFindParameters, Void, List<LocatorGeocodeResult>> {
private Exception mException = null;
@Override
protected void onPreExecute() {
super.onPreExecute();
dialog.show();
}
@Override
protected List<LocatorGeocodeResult> doInBackground(LocatorFindParameters... params) {
Locator locator = Locator.createOnlineLocator();
List<LocatorGeocodeResult> results = null;
try {
results = locator.find(params[0]);
} catch (Exception e) {
// e.printStackTrace();
mException = e;
}
return results;
}
@Override
protected void onPostExecute(List<LocatorGeocodeResult> result) {
dialog.dismiss();
if (mException != null) {
Log.e("PlaceSearch", "LocatorSyncTask failed with:");
mException.printStackTrace();
ToastUtils.show(MapQueryActivity.this, "地址搜索失败.");
return;
}
if (result.size() == 0) {
ToastUtils.show(MapQueryActivity.this, "没有搜索出结果.");
} else {
// Use first result in the list
LocatorGeocodeResult geocodeResult = result.get(0);
// get return geometry from geocode result
Point resultPoint = geocodeResult.getLocation();
// create marker symbol to represent location
SimpleMarkerSymbol resultSymbol = new SimpleMarkerSymbol(Color.RED, width, SimpleMarkerSymbol.STYLE.DIAMOND);
// create graphic object for resulting location
Graphic resultLocGraphic = new Graphic(resultPoint, resultSymbol);
// add graphic to location layer
mLocationLayer.addGraphic(resultLocGraphic);
// create text symbol for return address
// String address = geocodeResult.getAddress();
// TextSymbol resultAddress = new TextSymbol(20, address, Color.BLACK);
// resultAddress.setOffsetX(-4 * address.length());
// resultAddress.setOffsetY(10);
// Graphic resultText = new Graphic(resultPoint, resultAddress);
// // add address text graphic to location graphics layer
// mLocationLayer.addGraphic(resultText);
// mLocationLayerPoint = resultPoint;
// Zoom map to geocode result location
mapView.zoomToScale(geocodeResult.getLocation(), 5);
//投影坐标转换经纬度
// Point wgsPoint = (Point) GeometryEngine.project(resultPoint ,mapView.getSpatialReference(),SpatialReference.create(4326));
screenPoint = mapView.toScreenPoint(resultPoint);//投影坐标换屏幕坐标
// Log.e("Log.e","================X========"+wgsPoint.getX()+"===YYY==="+wgsPoint.getY()+"==="+mapView.getSpatialReference());
}
}
}
//*********************************************************************end**************************************************************************
//*******************************************************根据字段检索**********************************************************************
/** * 查询图层属性Task */ private void QueryFereatureTask(String param) { if (queryTask != null && AsyncTask.Status.RUNNING == queryTask.getStatus()) { queryTask.cancel(true); } queryTask = new QueryFeatureLayer(param); // CompatibleUtils.executeTask(queryTask); // queryTask.execute(param); CompatibleUtils.executeTask(queryTask); if (dialog == null) { dialog = CustomProgressDialog.createDialog(this); } dialog.show(); }
* 要素查询（查询层中的字段） */ private class QueryFeatureLayer extends AsyncTask<Object,Void, FeatureResult> { private Exception mException; private String whereClause; public QueryFeatureLayer(String param){ whereClause=param; } @Override protected FeatureResult doInBackground(Object... objects) { // String whereClause = "d_shi_mc ='" + params[0] + "' or d_shi_mc ='"+params[0]+"' or x_qi_mc ='"+params[0]+"' or x_zheng_mc ='"+params[0]+"'"; // Define a new query and set parameters QueryParameters mParams = new QueryParameters(); mParams.setWhere(whereClause); mParams.setReturnGeometry(true); mParams.setOutFields(new String[]{"ttcode","yjz","qd","yxl","dmlx","dxzzzd","fldj","dkmj","d_shi_mc","x_qi_mc","x_zheng_mc","cunmc,nhmc","dkmc"}); QueryTask queryTask = new QueryTask(URL_PLOT + "/0"); FeatureResult results; try { results = queryTask.execute(mParams); return results; } catch (Exception e) { mException = e; // e.printStackTrace(); } return null; } @Override protected void onPostExecute(FeatureResult results) { if (dialog != null) { dialog.dismiss(); } if (mException != null || results == null || results.featureCount() <= 0) { Toast.makeText(MapQueryActivity.this, "沒有搜索到该地块信息.", Toast.LENGTH_SHORT).show(); return; } loadQueryPoint(results); //设置地图中心点 // mapView.centerAt(point, true); // MapOptions mapOptions = new MapOptions(MapOptions.MapType.OSM); // mapOptions.setZoom(13); // mapView.setMapOptions(mapOptions); } }
//****************************************************android离线查询(.geoDatabase)**************************************************
/** * 加载geodatabase文件图层 * * @param featureLayerPath */ private void updateFeatureLayer(String featureLayerPath) { try { localGdb = new Geodatabase(featureLayerPath); } catch (FileNotFoundException e) { e.printStackTrace(); } if (localGdb != null) { gdbFeautureTable = localGdb.getGeodatabaseFeatureTableByLayerId(0); //如果有多个图层这需要这样，否则不需要 // for(GeodatabaseFeatureTable gdbFeautureTable:gdb.getGeodatabaseTables()){ // if(gdbFeautureTable.hasGeometry()){ // mapView.addLayer(new FeatureLayer(gdbFeautureTable)); //地块 // } // } FeatureLayer feautreLayer = new FeatureLayer(gdbFeautureTable); mapView.addLayer(feautreLayer); //地块 // localGdb.dispose();//释放资源如果放開ze 不能查詢 } }
private void inputSearch() { InputUtil.getInstance(MapQueryActivity.this).hide(); if (etSearch.getText().toString().equals("")) { Toast.makeText(MapQueryActivity.this, "请输入要查询的地名.", Toast.LENGTH_SHORT).show(); return; } String param = etSearch.getText().toString().trim(); String whereClause = "s_shi_mc like '%" + param + "%' or d_shi_mc like '%" + param + "%' or d_shi_mc like '%" + param + "%' or x_qi_mc like '%" + param + "%' or x_zheng_mc like '%" + param + "%'"; if (this.gdbFeautureTable != null) {//离线查询 QueryParameters mParams = new QueryParameters(); mParams.setWhere(whereClause); mParams.setReturnGeometry(true); //要返回的字段 mParams.setOutFields(new String[]{"s_shi_mc", "ttcode", "yjz", "qd", "yxl", "dmlx", "dxzzzd", "fldj", "Area", "d_shi_mc", "x_qi_mc", "x_zheng_mc", "cunmc", "nhmc", "dkmc", "area_code"}); gdbFeautureTable.queryFeatures(mParams, callbackPointListener); if (dialog == null) { dialog = CustomProgressDialog.createDialog(this); } dialog.show(); // feautreLayer.selectFeatures(mParams, FeatureLayer.SelectionMode.NEW,callbackPointListener); } }
/** * 根据字段查询回调 */ CallbackListener<FeatureResult> callbackPointListener = new CallbackListener<FeatureResult>() { @Override public void onCallback(final FeatureResult result) { runOnUiThread(new Runnable() { @Override public void run() { if (dialog != null) { dialog.dismiss(); } if (result != null && result.featureCount() > 0) { loadQueryPoint(result); } else { Toast.makeText(MapQueryActivity.this, "沒有搜索到该地块信息.", Toast.LENGTH_SHORT).show(); } } }); } @Override public void onError(Throwable throwable) { runOnUiThread(new Runnable() { @Override public void run() { if (dialog != null) { dialog.dismiss(); } Toast.makeText(MapQueryActivity.this, "沒有搜索到该地块信息.", Toast.LENGTH_SHORT).show(); } }); } };//*******************************************end***************************************************
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