Android Open Source - arcgis-runtime-samples-android Main Activity

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License

The source code is released under:

Apache License

Java Source Code

/* Copyright 2014 ESRI
 *//from w  ww. j av  a 2s.  c  o  m
 * All rights reserved under the copyright laws of the United States
 * and applicable international laws, treaties, and conventions.
 *
 * You may freely redistribute and use this sample code, with or
 * without modification, provided you include the original copyright
 * notice and use restrictions.
 *
 * See the sample code usage restrictions document for further information.
 *
 */

package com.esri.arcgis.android.samples.querytask;

import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.Toast;

import com.esri.android.map.GraphicsLayer;
import com.esri.android.map.MapView;
import com.esri.android.map.event.OnStatusChangedListener;
import com.esri.core.geometry.Envelope;
import com.esri.core.geometry.SpatialReference;
import com.esri.core.map.Feature;
import com.esri.core.map.FeatureResult;
import com.esri.core.map.Graphic;
import com.esri.core.renderer.SimpleRenderer;
import com.esri.core.symbol.SimpleFillSymbol;
import com.esri.core.tasks.query.QueryParameters;
import com.esri.core.tasks.query.QueryTask;

public class MainActivity extends Activity {

  MapView mMapView;
  GraphicsLayer graphicsLayer;
  Graphic fillGraphic;
  String queryLayer;
  boolean boolQuery = true;
  ProgressDialog progress;

  final static int HAS_RESULTS = 1;
  final static int NO_RESULT = 2;
  final static int CLEAR_RESULT = 3;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    mMapView = (MapView) findViewById(R.id.map);

    // get query service
    queryLayer = getResources().getString(R.string.query_service);
    mMapView.setOnStatusChangedListener(new OnStatusChangedListener() {

      private static final long serialVersionUID = 1L;

      @Override
      public void onStatusChanged(Object source, STATUS status) {
        if (source == mMapView && status == STATUS.INITIALIZED) {
          graphicsLayer = new GraphicsLayer();
          SimpleRenderer sr = new SimpleRenderer(
              new SimpleFillSymbol(Color.RED));
          graphicsLayer.setRenderer(sr);
          mMapView.addLayer(graphicsLayer);

        }
      }
    });

  }

  public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.action, menu);

    return super.onCreateOptionsMenu(menu);
  }

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

    case R.id.avg_household:
      String targetLayer = queryLayer.concat("/3");
      String[] queryArray = { targetLayer, "AVGHHSZ_CY>3.5" };
      AsyncQueryTask ayncQuery = new AsyncQueryTask();
      ayncQuery.execute(queryArray);
      return true;

    case R.id.reset:
      graphicsLayer.removeAll();
      boolQuery = true;

    }
    return super.onOptionsItemSelected(item);
  }

  /**
   * 
   * Query Task executes asynchronously.
   * 
   */
  private class AsyncQueryTask extends AsyncTask<String, Void, FeatureResult> {

    @Override
    protected void onPreExecute() {
      progress = new ProgressDialog(MainActivity.this);

      progress = ProgressDialog.show(MainActivity.this, "",
          "Please wait....query task is executing");

    }

    /**
     * First member in string array is the query URL; second member is the
     * where clause.
     */
    @Override
    protected FeatureResult doInBackground(String... queryArray) {

      if (queryArray == null || queryArray.length <= 1)
        return null;

      String url = queryArray[0];
      QueryParameters qParameters = new QueryParameters();
      String whereClause = queryArray[1];
      SpatialReference sr = SpatialReference.create(102100);
      qParameters.setGeometry(mMapView.getExtent());
      qParameters.setOutSpatialReference(sr);
      qParameters.setReturnGeometry(true);
      qParameters.setWhere(whereClause);

      QueryTask qTask = new QueryTask(url);

      try {
        FeatureResult results = qTask.execute(qParameters);
        return results;
      } catch (Exception e) {
        e.printStackTrace();
      }
      return null;

    }

    @Override
    protected void onPostExecute(FeatureResult results) {

      String message = "No result comes back";

      if (results != null) {
        int size = (int) results.featureCount();
        for (Object element : results) {
          progress.incrementProgressBy(size / 100);
          if (element instanceof Feature) {
            Feature feature = (Feature) element;
            // turn feature into graphic
            Graphic graphic = new Graphic(feature.getGeometry(),
                feature.getSymbol(), feature.getAttributes());
            // add graphic to layer
            graphicsLayer.addGraphic(graphic);
          }
        }
        // update message with results
        message = String.valueOf(results.featureCount())
            + " results have returned from query.";

      }
      progress.dismiss();
      Toast toast = Toast.makeText(MainActivity.this, message,
          Toast.LENGTH_LONG);
      toast.show();
      boolQuery = false;

    }

  }

  @Override
  protected void onPause() {
    super.onPause();
    mMapView.pause();
  }

  @Override
  protected void onResume() {
    super.onResume();
    mMapView.unpause();
  }

}

Java Source Code List

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