本文介绍了如何makeIdentify任务在ArcGIS API与标准的WMS机器人工作的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想用明确任务 ARCGIS中为API使用android.I的的，它工作正常，但是当我尝试更改URL从另一个WMS获取数据它显示错误
这里是我的另一个
我得到的错误如下因素行
I want to use Identify Task in ARCGIS API for android.I used this example and it works fine but when I try to change the URL to get data from another WMS it shows errorhere is my another wmsI get error in folowing line
for (int index = 0; index < results.length; index++) {
result_1 = results[index];
String displayFieldName = result_1.getDisplayFieldName();
Map<String, Object> attr = result_1.getAttributes();
for (String key : attr.keySet()) {
if (key.equalsIgnoreCase(displayFieldName)) {
resultList.add(result_1);
}
}
}
在这个类我从例子了
in this class which I have got from example
package com.esri.arcgis.android.samples.identifytask;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import com.esri.android.action.IdentifyResultSpinner;
import com.esri.android.action.IdentifyResultSpinnerAdapter;
import com.esri.android.map.Callout;
import com.esri.android.map.MapView;
import com.esri.android.map.ags.ArcGISTiledMapServiceLayer;
import com.esri.android.map.event.OnSingleTapListener;
import com.esri.core.geometry.Envelope;
import com.esri.core.geometry.Point;
import com.esri.core.tasks.identify.IdentifyParameters;
import com.esri.core.tasks.identify.IdentifyResult;
import com.esri.core.tasks.identify.IdentifyTask;
/**
* This sample allows the user to identify data based on single tap and view the
* results in a callout window which has a spinner in its layout. Also the user
* can select any of the results displayed and view its details. The details are
* the attribute values.
*
* The output value shown in the spinner is the display field.
*
*/
public class Identify extends Activity {
// create ArcGIS objects
MapView mMapView = null;
IdentifyParameters params = null;
// create UI objects
static ProgressDialog dialog;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Retrieve the map and initial extent from XML layout
mMapView = (MapView) findViewById(R.id.map);
// add demographic layer to the map
mMapView.addLayer(new ArcGISTiledMapServiceLayer(this.getResources()
.getString(R.string.identify_task_url_for_avghouseholdsize)));
// set Identify Parameters
params = new IdentifyParameters();
params.setTolerance(20);
params.setDPI(98);
params.setLayers(new int[] { 4 });
params.setLayerMode(IdentifyParameters.ALL_LAYERS);
// Identify on single tap of map
mMapView.setOnSingleTapListener(new OnSingleTapListener() {
private static final long serialVersionUID = 1L;
@Override
public void onSingleTap(final float x, final float y) {
if (!mMapView.isLoaded()) {
return;
}
// Add to Identify Parameters based on tapped location
Point identifyPoint = mMapView.toMapPoint(x, y);
params.setGeometry(identifyPoint);
params.setSpatialReference(mMapView.getSpatialReference());
params.setMapHeight(mMapView.getHeight());
params.setMapWidth(mMapView.getWidth());
params.setReturnGeometry(false);
// add the area of extent to identify parameters
Envelope env = new Envelope();
mMapView.getExtent().queryEnvelope(env);
params.setMapExtent(env);
// execute the identify task off UI thread
MyIdentifyTask mTask = new MyIdentifyTask(identifyPoint);
mTask.execute(params);
}
});
}
private ViewGroup createIdentifyContent(final List<IdentifyResult> results) {
// create a new LinearLayout in application context
LinearLayout layout = new LinearLayout(this);
// view height and widthwrap content
layout.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
// default orientation
layout.setOrientation(LinearLayout.HORIZONTAL);
// Spinner to hold the results of an identify operation
IdentifyResultSpinner spinner = new IdentifyResultSpinner(this, results);
// make view clickable
spinner.setClickable(false);
spinner.canScrollHorizontally(BIND_ADJUST_WITH_ACTIVITY);
// MyIdentifyAdapter creates a bridge between spinner and it's data
MyIdentifyAdapter adapter = new MyIdentifyAdapter(this, results);
spinner.setAdapter(adapter);
spinner.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.WRAP_CONTENT));
layout.addView(spinner);
return layout;
}
/**
* This class allows the user to customize the string shown in the callout.
* By default its the display field name.
*
* A spinner adapter defines two different views; one that shows the data in
* the spinner itself and one that shows the data in the drop down list when
* spinner is pressed.
*
*/
public class MyIdentifyAdapter extends IdentifyResultSpinnerAdapter {
String m_show = null;
List<IdentifyResult> resultList;
int currentDataViewed = -1;
Context m_context;
public MyIdentifyAdapter(Context context, List<IdentifyResult> results) {
super(context, results);
this.resultList = results;
this.m_context = context;
}
// Get a TextView that displays identify results in the callout.
@Override
public View getView(int position, View convertView, ViewGroup parent) {
String LSP = System.getProperty("line.separator");
StringBuilder outputVal = new StringBuilder();
// Resource Object to access the Resource fields
Resources res = getResources();
// Get Name attribute from identify results
IdentifyResult curResult = this.resultList.get(position);
if (curResult.getAttributes().containsKey(
res.getString(R.string.NAME))) {
outputVal.append("Place: "
+ curResult.getAttributes()
.get(res.getString(R.string.NAME)).toString());
outputVal.append(LSP);
}
if (curResult.getAttributes().containsKey(
res.getString(R.string.ID))) {
outputVal.append("State ID: "
+ curResult.getAttributes()
.get(res.getString(R.string.ID)).toString());
outputVal.append(LSP);
}
if (curResult.getAttributes().containsKey(
res.getString(R.string.ST_ABBREV))) {
outputVal.append("Abbreviation: "
+ curResult.getAttributes()
.get(res.getString(R.string.ST_ABBREV))
.toString());
outputVal.append(LSP);
}
if (curResult.getAttributes().containsKey(
res.getString(R.string.TOTPOP_CY))) {
outputVal.append("Population: "
+ curResult.getAttributes()
.get(res.getString(R.string.TOTPOP_CY))
.toString());
outputVal.append(LSP);
}
if (curResult.getAttributes().containsKey(
res.getString(R.string.LANDAREA))) {
outputVal.append("Area: "
+ curResult.getAttributes()
.get(res.getString(R.string.LANDAREA))
.toString());
outputVal.append(LSP);
}
// Create a TextView to write identify results
TextView txtView;
txtView = new TextView(this.m_context);
txtView.setText(outputVal);
txtView.setTextColor(Color.BLACK);
txtView.setLayoutParams(new ListView.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
txtView.setGravity(Gravity.CENTER_VERTICAL);
return txtView;
}
}
@Override
protected void onPause() {
super.onPause();
mMapView.pause();
}
@Override
protected void onResume() {
super.onResume();
mMapView.unpause();
}
private class MyIdentifyTask extends
AsyncTask<IdentifyParameters, Void, IdentifyResult[]> {
IdentifyTask task = new IdentifyTask(Identify.this.getResources()
.getString(R.string.identify_task_url_for_avghouseholdsize));
IdentifyResult[] M_Result;
Point mAnchor;
MyIdentifyTask(Point anchorPoint) {
mAnchor = anchorPoint;
}
@Override
protected void onPreExecute() {
// create dialog while working off UI thread
dialog = ProgressDialog.show(Identify.this, "Identify Task",
"Identify query ...");
}
protected IdentifyResult[] doInBackground(IdentifyParameters... params) {
// check that you have the identify parameters
if (params != null && params.length > 0) {
IdentifyParameters mParams = params[0];
try {
// Run IdentifyTask with Identify Parameters
M_Result = task.execute(mParams);
} catch (Exception e) {
e.printStackTrace();
}
}
return M_Result;
}
@Override
protected void onPostExecute(IdentifyResult[] results) {
// dismiss dialog
if (dialog.isShowing()) {
dialog.dismiss();
}
ArrayList<IdentifyResult> resultList = new ArrayList<IdentifyResult>();
IdentifyResult result_1;
for (int index = 0; index < results.length; index++) {
result_1 = results[index];
String displayFieldName = result_1.getDisplayFieldName();
Map<String, Object> attr = result_1.getAttributes();
for (String key : attr.keySet()) {
if (key.equalsIgnoreCase(displayFieldName)) {
resultList.add(result_1);
}
}
}
Callout callout = mMapView.getCallout();
callout.setContent(createIdentifyContent(resultList));
callout.show(mAnchor);
}
}
}
这是错误
06-11 19:01:21.384 18989-18989/com.tehranuni.hazard.hazard E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.tehranuni.hazard.hazard, PID: 18989
java.lang.NullPointerException: Attempt to get length of null array
at com.tehranuni.hazard.hazard.gatter_geo_data$MyIdentifyTask.onPostExecute(gatter_geo_data.java:714)
at com.tehranuni.hazard.hazard.gatter_geo_data$MyIdentifyTask.onPostExecute(gatter_geo_data.java:661)
at android.os.AsyncTask.finish(AsyncTask.java:632)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:211)
at android.app.ActivityThread.main(ActivityThread.java:5321)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1016)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:811)
at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:117)
由于错误说结果为空，我认为这是因为它没有得到WMS领域layer.What让你觉得这个错误的？有什么办法解决？
As the error say results is null and I think it is because it does not get fields from WMS layer.What so you think about this error?Is there any way to fix it?
感谢你这么多的帮助。
推荐答案
IdentifyTask 只能用ArcGIS Server地图服务，而不是一个WMS工作。
IdentifyTask works only with an ArcGIS Server map service, not a WMS.
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