Populate AlertDialog from Webservice layer?

JohnAllen

I have an actionbar on may mapscreen. (Image 1)

When I select the search icon (or menu item) on my actionbar and alertdialog appears with names that I manually entered into my code (String Array).

How do I populate the alert dialog with location names (names from a layer in the mapservice that has a Names field) from a map service layer? (Image 2)

If you could post some sample code and explain, that would be great.

Thanks!

John

Code:

public boolean onCreateOptionsMenu(Menu menu) {
  MenuInflater inflater = getMenuInflater();
  inflater.inflate(R.menu.actionbar_menu, menu);  
  return true;
 }
 
 public boolean onOptionsItemSelected(MenuItem item) {  
  
  switch (item.getItemId()){ 
  
  case R.id.SearchTool: 
   AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
                        //This is where I manually entered in my location names.
   final String[] locations = {"Blue Water", "Big Fish ", "Beaverdam", "Wake", "Dock Side", "Oceanview", "Beach 
                        Front", "Lake Side", "Boaters Choice"};
   dialogBuilder.setTitle("Select a Location:");
   dialogBuilder.setItems(locations, new DialogInterface.OnClickListener() {
    
    @Override
    public void onClick(DialogInterface dialog, int which) {
     //Do something when location is selected within the alertdialog.
    }
   });
   AlertDialog alertDialog = dialogBuilder.create();
   alertDialog.show();

Image1.png

Image2.png

cawdaptscreenshot.png

mapamin.jpg

DavidHendry_3-1772810669272.png

DavidHendry_2-1772810669271.png

JohnAllen

Follow up....

I figured it out with the help from a friend.
FYI - The declared names of objects are a little different in the code below when compared to the code I previously posted above, but you should be able to follow.

Work flow - Starting from the onPostExecute method:
1. If result is not null..."do something".
2. Create a Graphics Array and put the FeatureSet results in the Array.
3. Create/Initialize Alert Dialog Builder.
4. Set the Title for the Alert Dialog.
5. Create a String Array and declare the length of the Array, which is the length of the Graphics Array in step two above.
6. Create a loop that goes through each column of the graphic array.
7. Declare a Graphic object that is equal to the graphic array loop.
8. Create a String Array and put the graphics attribute values "Name" in the String Array as a string type.
9. Set the Alert Dialog items as that of the String Array, in this case "arr" & create a new Dialog Interface.OnClickListener
10. Create the Alert Dialog.
11. Show the Alert Dialog.

The code below solves my problem stated in opening post:

package com.dhec.MPOS;

import com.esri.android.map.MapView;
import com.esri.core.map.FeatureSet;
import com.esri.core.map.Graphic;
import com.esri.core.tasks.ags.query.Query;
import com.esri.core.tasks.ags.query.QueryTask;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

//MapScreen is a subclass of Activity.
public class MapScreen extends Activity {

 public MapView map;

 /*
  * Called when the Activity is first created. Remember the Activity and its
  * methods are created first. Then the MapScreen class is used.
  */
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.mapscreen);

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

 }

 public boolean onCreateOptionsMenu(Menu menu) {
  MenuInflater inflater = getMenuInflater();
  inflater.inflate(R.menu.actionbar_menu, menu);
  return true;
 }

 public boolean onOptionsItemSelected(MenuItem item) {
  switch (item.getItemId()) {

  case R.id.SearchTool:

   Query query = new Query();
   query.setWhere("State = 'South Carolina'");
   query.setReturnGeometry(true);
   String[] outfields = new String[] { "Name" };
   query.setOutFields(outfields);
   query.setOutSpatialReference(map.getSpatialReference());

   Query[] queryParams = { query };
   AsyncQueryTask qt = new AsyncQueryTask();
   qt.execute(queryParams);

  }
  return false;
 }

 private class AsyncQueryTask extends AsyncTask<Query, Void, FeatureSet> {

  protected FeatureSet doInBackground(Query... params) {

   if (params.length > 0) {
    Query query = params[0];
    QueryTask queryTask = new QueryTask(
      "Put MAP SERVER URL HERE");
    try {
     FeatureSet fs = queryTask.execute(query);
     return fs;
    } catch (Exception e) {
     e.printStackTrace();
     return null;
    }
   }

   return null;
  }

  protected void onPostExecute(FeatureSet result) {

   if (result != null) {
    
    Graphic[] graphics = result.getGraphics();
    AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(MapScreen.this);
    dialogBuilder.setTitle("Select a Location:");
    String[] arr = new String[graphics.length];
   
    for (int i = 0; i < graphics.length; i++) {
     Graphic g = graphics;
     arr = (String) g.getAttributeValue("Name");
    }
    
    dialogBuilder.setItems(arr, new DialogInterface.OnClickListener() {
       @Override
       public void onClick(DialogInterface dialog,int which) {
        //This is where you tell the application to do something once you click 
        //the name within the alert dialog.
       }
      });
    AlertDialog alertDialog = dialogBuilder.create();
    alertDialog.show();
   }
  }
 }
}

Thomas, thanks for giving me information.

Hope this helps others.