最近我开始研究ArcGIS for Android。在我的应用程序中，我可以使用在 ArcGIS.com 中创建的服务，并且可以在 Android 设备中显示地图。现在我想在单击特定图层时获取地图的图层信息。关于 ArcGIS 资源的信息不多。如果可能的话，如果有人指导我如何通过一些示例获取信息，那将是非常棒的。显示地图的代码是：
私有 MapView 地图 = null;
String dynamicMapURL = " http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StateCityHighway_USA/MapServer ";
map = (MapView) findViewById(R.id.map);
ArcGISDynamicMapServiceLayer dynamicLayer = new ArcGISDynamicMapServiceLayer(dynamicMapURL); map.addLayer(dynamicLayer);
试试IdentifyTask 类。它适用于动态地图服务。
ArcGIS SDK for Android 有一个IdentifyTask 示例作为Eclipse SDK 插件的一部分。安装插件后，在 Eclipse 中，转到 File > New > Other。选择 ArcGIS for Android > ArcGIS Samples for Android。选中本地样本框，然后选择任务 > 识别任务。
这是使用 ArcGIS-Runtime v100.x Android SDK 在 ArcGIS 地图要素图层上识别和选择对象的简单代码片段。
MainActivity.java
import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.Toast;
import com.esri.arcgisruntime.concurrent.ListenableFuture;
import com.esri.arcgisruntime.data.ArcGISFeature;
import com.esri.arcgisruntime.data.Feature;
import com.esri.arcgisruntime.data.FeatureEditResult;
import com.esri.arcgisruntime.data.FeatureQueryResult;
import com.esri.arcgisruntime.data.QueryParameters;
import com.esri.arcgisruntime.data.ServiceFeatureTable;
import com.esri.arcgisruntime.geometry.Envelope;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.layers.ArcGISTiledLayer;
import com.esri.arcgisruntime.layers.FeatureLayer;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.Basemap;
import com.esri.arcgisruntime.mapping.view.DefaultMapViewOnTouchListener;
import com.esri.arcgisruntime.mapping.view.GraphicsOverlay;
import com.esri.arcgisruntime.mapping.view.MapView;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.ExecutionException;
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private MapView mMapView = null;
private ArcGISMap mMap = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mMapView = findViewById(R.id.mapView);
mMap = new ArcGISMap();
mMapView.setMap(mMap);
// Applying base map as tiled layer.
final Basemap baseMap = new Basemap(new ArcGISTiledLayer("http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"));
mMap.setBasemap(baseMap);
final ServiceFeatureTable serviceFeatureTable = new ServiceFeatureTable("http://..feature-layer-full-url");
final FeatureLayer featureLayer = new FeatureLayer(serviceFeatureTable);
featureLayer.setSelectionColor(Color.BLUE);
featureLayer.setSelectionWidth(10);
mMap.getOperationalLayers().add(featureLayer);
final GraphicsOverlay overlay = new GraphicsOverlay();
mMapView.getGraphicsOverlays().add(overlay);
mMapView.setOnTouchListener(new DefaultMapViewOnTouchListener(this, mMapView) {
@Override
public boolean onSingleTapConfirmed(MotionEvent event) {
android.graphics.Point screenPoint = new android.graphics.Point(Math.round(event.getX()), Math.round(event.getY()));
Point scenePoint = mMapView.screenToLocation(screenPoint);
int tolerance = 10;
double mapTolerance = tolerance * mMapView.getUnitsPerDensityIndependentPixel();
// create objects required to do a selection with a query
Envelope envelope = new Envelope(scenePoint.getX() - mapTolerance, scenePoint.getY() - mapTolerance, scenePoint.getX() + mapTolerance, scenePoint.getY() + mapTolerance, mMapView.getSpatialReference());
QueryParameters query = new QueryParameters();
query.setGeometry(envelope);
final ListenableFuture<FeatureQueryResult> future = featureLayer.selectFeaturesAsync(query, FeatureLayer.SelectionMode.ADD);
// add done loading listener to fire when the selection returns
future.addDoneListener(new Runnable() {
@Override
public void run() {
try {
FeatureQueryResult result = future.get();
Iterator<Feature> iterator = result.iterator();
Feature feature;
int counter = 0;
while (iterator.hasNext()) {
feature = iterator.next();
counter++;
Log.d(getResources().getString(R.string.app_name), "Selection #: " + counter + " Table name: " + feature.getFeatureTable().getTableName());
}
Toast.makeText(getApplicationContext(), counter + " features selected", Toast.LENGTH_SHORT).show();
} catch (Exception e) {
Log.e(getResources().getString(R.string.app_name), "Select feature failed: " + e.getMessage());
}
}
});
return true;
}
});
}
@Override
protected void onPause() {
mMapView.pause();
super.onPause();
}
@Override
protected void onResume() {
super.onResume();
mMapView.resume();
}
@Override
protected void onDestroy() {
super.onDestroy();
mMapView.dispose();
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<com.esri.arcgisruntime.mapping.view.MapView
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
注意：这在 Android Studio v3.xx 和 Java 1.8 中可以正常工作。
build.gradle（模块）：
implementation 'com.esri.arcgisruntime:arcgis-android:100.2.1'build.gradle（项目）：maven { url ' https://esri.bintray.com/arcgis ' }