初识ArcGis for android 的IdentitfyTask

本人第一次试用IdentiFyTask做查询工作，

1.试用了天地图图层，这个是网上下载到的，

2.导入ArcGis for android 的相关jia包

主要代码如下：：：

（1）使用AsyncTask进行IdentifyTask 的查询

public class MyIdentifyTask extends AsyncTask<IdentifyParameters, Void, IdentifyResult[]>{
IdentifyTask identifyTask;
private ProgressDialog dialog;
Context context;
MapView map;
Point point;

public MyIdentifyTask(Point point, Context context,MapView map){
this.context = context;
this.map = map;
this.point = point;
}

@Override
protected IdentifyResult[] doInBackground(IdentifyParameters... params) {
IdentifyResult[] mResult = null;
if(params!=null&&params.length>0){
try {
mResult = identifyTask.execute(params[0]);
} catch (Exception e) {
e.printStackTrace();
}
}
return mResult;
}

@Override
protected void onPreExecute() {
dialog = ProgressDialog.show(context, "Identify Task", "Identify query ...");
identifyTask = new IdentifyTask("http://221.13.129.100:6080/arcgis/rest/services/ZZWebGisData/MapServer");

}

@Override
protected void onPostExecute(IdentifyResult[] result) {
if(dialog.isShowing()){
dialog.dismiss();
Callout out = map.getCallout();
TextView view = new TextView(context);
if(result.length>0){
view.setText(result[0].getLayerName());
}else{
view.setText("暂无信息");
}
out.setContent(view);
out.show(point);
}

}
}

(2)   MainActivity如下

public class MainActivity extends Activity {


private MapView map;
private com.example.identifytask.TianDiTuTiledMapServiceLayer tianDiTuLayer;
private com.example.identifytask.TianDiTuTiledMapServiceLayer tianDiTuLayer2;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

map = (MapView)findViewById(R.id.map);

//添加天地图作为底图图层（使用的上面下载到图层转换代码）
tianDiTuLayer = new TianDiTuTiledMapServiceLayer(TianDiTuTiledMapServiceType.VEC_C);

//添加天地图的标注图层
tianDiTuLayer2 = new TianDiTuTiledMapServiceLayer(TianDiTuTiledMapServiceType.CVA_C);

//添加自己的图层
ArcGISDynamicMapServiceLayer dLayer = new ArcGISDynamicMapServiceLayer("http://221.13.129.100:6080/arcgis/rest/services/ZZWebGisData/MapServer");
//设置地图背景色（不添加地图的时候能够看出来，白色无网格）
map.setMapBackground(0xffffff, 0xffffff, 0, 0);
//去除前面的use only的水印
ArcGISRuntime.setClientId("1eFHW78avlnRUPHm");

map.addLayer(tianDiTuLayer);
map.addLayer(tianDiTuLayer2);
map.addLayer(dLayer);

map.setOnSingleTapListener(new OnSingleTapListener() {
@Override
public void onSingleTap(float x, float y) {
if(!map.isLoaded()){
return;
}
//坐标转换
Point identifyPoint = map.toMapPoint(x, y);
        Point point = (Point)GeometryEngine.project(identifyPoint, SpatialReference.create(4490), SpatialReference.create(2383));

IdentifyParameters params = new IdentifyParameters();
params.setGeometry(point);
        params.setSpatialReference(SpatialReference.create(2383));
params.setDPI(98);
params.setTolerance(20);
params.setMapHeight(map.getHeight());
params.setMapWidth(map.getWidth());
params.setLayerMode(IdentifyParameters.ALL_LAYERS);
Envelope env = new Envelope();
           map.getExtent().queryEnvelope(env);
           params.setMapExtent(env);
//实例化自己定义的类
MyIdentifyTask myIdentifyTask = new MyIdentifyTask(identifyPoint,MainActivity.this,map);
myIdentifyTask.execute(params);
}
});


}


}