MapView.SetExtent problem
I'm making a simple app to Query Features (Polygons) and then zoom to results , but when it zooms the zoom is too far (no envelope padding in the setExtent method ) , I barely see the feature , and it doesn't zoom more than this even with the manual double tap technique
Here is the code :
public class MainActivity extends ActionBarActivity {
MapView mMapView;
ArcGISFeatureLayer mFeatureLayer;
GraphicsLayer graphicsLayer;
boolean mIsMapLoaded;
String mFeatureServiceURL;
EditText queryText;
public void onSubmit(View view){
//reference the values
queryText = (EditText) findViewById(R.id.queryText);
new QueryFeatureLayer().execute(queryText.getText().toString());
}
class QueryFeatureLayer extends AsyncTask<String, Void, FeatureResult> {
@Override
protected FeatureResult doInBackground(String... params) {
String whereClause = "name ='" + params[0] + "'";
// Define a new query and set parameters
QueryParameters mParams = new QueryParameters();
mParams.setWhere(whereClause);
mParams.setReturnGeometry(true);
// Define the new instance of QueryTask
QueryTask queryTask = new QueryTask(mFeatureServiceURL);
FeatureResult results;
try {
// run the querytask
results = queryTask.execute(mParams);
return results;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(FeatureResult results) {
super.onPostExecute(results);
// Remove the result from previously run query task
graphicsLayer.removeAll();
// Define a new marker symbol for the result graphics
SimpleMarkerSymbol sms = new SimpleMarkerSymbol(Color.BLUE, 10, SimpleMarkerSymbol.STYLE.CIRCLE);
SimpleFillSymbol fsymbol = new SimpleFillSymbol(Color.RED);
// Envelope to focus on the map extent on the results
Envelope extent = new Envelope();
// iterate through results
for (Object element : results) {
// if object is feature cast to feature
if (element instanceof Feature) {
Feature feature = (Feature) element;
// convert feature to graphic
Graphic graphic = new Graphic(feature.getGeometry(), feature.getSymbol(), feature.getAttributes());
mMapView.setExtent(feature.getGeometry());
// add it to the layer
graphicsLayer.addGraphic(graphic);
}
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final MapOptions mStreetsBasemap = new MapOptions(MapOptions.MapType.STREETS);
// Retrieve the map and initial extent from XML layout
mMapView = (MapView) findViewById(R.id.map);
// Get the feature service URL from values->strings.xml
mFeatureServiceURL = this.getResources().getString(R.string.featureServiceURL);
// Add Feature layer to the MapView
mFeatureLayer = new ArcGISFeatureLayer(mFeatureServiceURL, ArcGISFeatureLayer.MODE.ONDEMAND);
mMapView.addLayer(mFeatureLayer);
// Add Graphics layer to the MapView
SimpleRenderer sr = new SimpleRenderer(
new SimpleFillSymbol(Color.RED));
graphicsLayer.setRenderer(sr);
//mGraphicsLayer = new GraphicsLayer();
mMapView.addLayer(graphicsLayer);
//add the code below to set a listener that will be called when the MapView is initialized.
// You will check this in a later step to see if the map is ready for a user to make queries.
mMapView.setOnStatusChangedListener(new OnStatusChangedListener() {
public void onStatusChanged(Object source, STATUS status) {
if ((source == mMapView) && (status == OnStatusChangedListener.STATUS.INITIALIZED)) {
mIsMapLoaded = true;
}
}
});
}
}
