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/* Copyright 2014 ESRI *// w w w . j av a2s. 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.GeoJSONEarthquakeMap; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.util.HashMap; import java.util.Map; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import android.app.Activity; import android.app.ProgressDialog; import android.content.Context; import android.graphics.Color; import android.os.AsyncTask; import android.os.Bundle; import android.widget.TextView; import android.widget.Toast; import com.esri.android.map.Callout; import com.esri.android.map.GraphicsLayer; 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.GeometryEngine; import com.esri.core.geometry.Point; import com.esri.core.geometry.SpatialReference; import com.esri.core.map.Graphic; import com.esri.core.symbol.SimpleMarkerSymbol; /** * This sample demonstrates how to use information from a GEOJson feed. For this * example, seven days significant earthquakes feed from USGS is used which is * updated every minute. Json parser is used to parse the GEOJson feed. * */ public class GeoJSONEarthquakeMapActivity extends Activity { MapView mMapView = null; ArcGISTiledMapServiceLayer basemapTileLayer; GraphicsLayer graphicsLayer = null; Graphic g_selected; 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); // Create a grahics layer and add it to the map graphicsLayer = new GraphicsLayer(); mMapView.addLayer(graphicsLayer); // attribute map mMapView.setEsriLogoVisible(true); // enable map to cross dateline mMapView.enableWrapAround(true); MyOnSingleTapListener listener = new MyOnSingleTapListener(this); mMapView.setOnSingleTapListener(listener); FetchEvents earthQuakeEevents = new FetchEvents(); earthQuakeEevents.execute(); } private class MyOnSingleTapListener implements OnSingleTapListener { // Here, we use a single tap to popup the attributes for a report... Context _ctx; private static final long serialVersionUID = 1L; public MyOnSingleTapListener(Context ctx) { _ctx = ctx; } @Override public void onSingleTap(float x, float y) { SimpleMarkerSymbol symbol; float mag; int size; // To reset the color if (g_selected != null) { mag = Float.valueOf(g_selected.getAttributeValue("Magnitude") .toString()); size = getSizefromMag(mag); symbol = new SimpleMarkerSymbol(Color.rgb(255, 128, 64), size, SimpleMarkerSymbol.STYLE.CIRCLE); graphicsLayer.updateGraphic(g_selected.getUid(), symbol); } Callout mapCallout = mMapView.getCallout(); mapCallout.hide(); Point pnt = mMapView.toMapPoint(x, y); int[] grs = graphicsLayer.getGraphicIDs(x, y, 20); if (grs.length > 0) { // Getting the nearest graphic g_selected = graphicsLayer.getGraphic(grs[0]); // Changing the color of the selected graphic mag = Float.valueOf(g_selected.getAttributeValue("Magnitude") .toString()); size = getSizefromMag(mag); symbol = new SimpleMarkerSymbol(Color.BLUE, size, SimpleMarkerSymbol.STYLE.CIRCLE); graphicsLayer.updateGraphic(grs[0], symbol); Map<String, Object> atts = g_selected.getAttributes(); String text = ""; for (int i = 0; i < atts.size(); i++) { text = text + atts.keySet().toArray()[i] + ": " + atts.values().toArray()[i] + "\n"; } TextView tv = new TextView(_ctx); tv.setText(text); tv.setTextSize(10); // Here, we populate the Callout with the attribute information // from the report. mapCallout.setOffset(0, 0); mapCallout.setCoordinates(pnt); mapCallout.setMaxWidth(1300); mapCallout.setMaxHeight(200); mapCallout.setStyle(R.xml.mycalloutprefs); mapCallout.setContent(tv); mapCallout.show(); } } } private class FetchEvents extends AsyncTask<Void, Void, Void> { private ProgressDialog mProgDialog; @Override protected void onPreExecute() { // remove any previous callouts if (mMapView.getCallout().isShowing()) { mMapView.getCallout().hide(); } // show progress dialog while searching for events mProgDialog = ProgressDialog.show( GeoJSONEarthquakeMapActivity.this, "", "Fetching GeoJson, Please wait....", true); } @Override protected Void doInBackground(Void... params) { graphicsLayer.removeAll(); getEarthquakeEvents(); return null; } @Override protected void onPostExecute(Void result) { // remove dialog if (mProgDialog.isShowing()) { mProgDialog.dismiss(); } if (graphicsLayer != null && graphicsLayer.getNumberOfGraphics() == 0) { // update UI with notice that no results were found Toast.makeText(GeoJSONEarthquakeMapActivity.this, "There are no earthquake events to be shown.", Toast.LENGTH_SHORT).show(); } } } private void getEarthquakeEvents() { int size; String url = this.getResources().getString(R.string.earthquake_url); try { // Making the request and getting the response HttpClient client = new DefaultHttpClient(); HttpGet req = new HttpGet(url); HttpResponse res = client.execute(req); // Converting the response stream to string HttpEntity jsonentity = res.getEntity(); InputStream in = jsonentity.getContent(); String json_str = convertStreamToString(in); JSONObject jsonobj = new JSONObject(json_str); JSONArray feature_arr = jsonobj.getJSONArray("features"); SimpleMarkerSymbol symbol = new SimpleMarkerSymbol(Color.rgb(255, 128, 64), 15, SimpleMarkerSymbol.STYLE.CIRCLE); for (int i = 0; i < feature_arr.length(); i++) { // Getting the coordinates and projecting them to map's spatial // reference JSONObject obj_geometry = feature_arr.getJSONObject(i) .getJSONObject("geometry"); double lon = Double.parseDouble(obj_geometry.getJSONArray("coordinates") .get(0).toString()); double lat = Double.parseDouble(obj_geometry.getJSONArray("coordinates") .get(1).toString()); Point point = (Point) GeometryEngine.project( new Point(lon, lat), SpatialReference.create(4326), mMapView.getSpatialReference()); JSONObject obj_properties = feature_arr.getJSONObject(i) .getJSONObject("properties"); Map<String, Object> attr = new HashMap<String, Object>(); String place = obj_properties.getString("place").toString(); attr.put("Location", place); // Setting the size of the symbol based upon the magnitude float mag = Float.valueOf(obj_properties.getString("mag") .toString()); size = getSizefromMag(mag); symbol.setSize(size); attr.put("Magnitude", mag); // Converting time from unix time to date format long timeStamp = Long.valueOf(obj_properties.getString("time") .toString()); java.util.Date time = new java.util.Date((long) timeStamp); attr.put("Time ", time.toString()); attr.put("Rms ", obj_properties.getString("rms").toString()); attr.put("Gap ", obj_properties.getString("gap").toString()); // Add graphics to the graphic layer graphicsLayer.addGraphic(new Graphic(point, symbol, attr)); } } catch (ClientProtocolException e) { // Catch exceptions here e.printStackTrace(); } catch (IOException e) { // Catch exceptions here e.printStackTrace(); } catch (JSONException e) { // Catch exceptions here e.printStackTrace(); } } public String convertStreamToString(InputStream in) { BufferedReader br = new BufferedReader(new InputStreamReader(in)); StringBuilder jsonstr = new StringBuilder(); String line; try { while ((line = br.readLine()) != null) { String t = line + "\n"; jsonstr.append(t); } br.close(); } catch (IOException e) { e.printStackTrace(); } return jsonstr.toString(); } private int getSizefromMag(float mag) { int size; if (mag < 5) size = 7; else if (mag >= 5 && mag < 6.5) size = 10; else size = 15; return size; } @Override protected void onPause() { super.onPause(); mMapView.pause(); } @Override protected void onResume() { super.onResume(); mMapView.unpause(); } }