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Friday, 4 January 2013

Google Maps Android API v2 example: Draw Polygon on GoogleMap

05:19
Last post demonstrate how to "Draw Polyline on GoogleMap of Google Maps Android API v2", we can draw Polygon using the almost same procedure.

Draw Polygon on GoogleMap


package com.example.androidmapsv2;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapLongClickListener;
import com.google.android.gms.maps.GoogleMap.OnMarkerClickListener;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.GoogleMap.OnMapClickListener;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.Polygon;
import com.google.android.gms.maps.model.PolygonOptions;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.FragmentManager;
import android.graphics.Color;
import android.location.Location;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity
implements OnMapClickListener, OnMapLongClickListener, OnMarkerClickListener{

final int RQS_GooglePlayServices = 1;
private GoogleMap myMap;

Location myLocation;
TextView tvLocInfo;

boolean markerClicked;
PolygonOptions polygonOptions;
Polygon polygon;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

tvLocInfo = (TextView)findViewById(R.id.locinfo);

FragmentManager myFragmentManager = getFragmentManager();
MapFragment myMapFragment
= (MapFragment)myFragmentManager.findFragmentById(R.id.map);
myMap = myMapFragment.getMap();

myMap.setMyLocationEnabled(true);

myMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);

myMap.setOnMapClickListener(this);
myMap.setOnMapLongClickListener(this);
myMap.setOnMarkerClickListener(this);

markerClicked = false;
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_legalnotices:
String LicenseInfo = GooglePlayServicesUtil.getOpenSourceSoftwareLicenseInfo(
getApplicationContext());
AlertDialog.Builder LicenseDialog = new AlertDialog.Builder(MainActivity.this);
LicenseDialog.setTitle("Legal Notices");
LicenseDialog.setMessage(LicenseInfo);
LicenseDialog.show();
return true;
}
return super.onOptionsItemSelected(item);
}

@Override
protected void onResume() {

super.onResume();

int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext());

if (resultCode == ConnectionResult.SUCCESS){
Toast.makeText(getApplicationContext(),
"isGooglePlayServicesAvailable SUCCESS",
Toast.LENGTH_LONG).show();
}else{
GooglePlayServicesUtil.getErrorDialog(resultCode, this, RQS_GooglePlayServices);
}

}

@Override
public void onMapClick(LatLng point) {
tvLocInfo.setText(point.toString());
myMap.animateCamera(CameraUpdateFactory.newLatLng(point));

markerClicked = false;
}

@Override
public void onMapLongClick(LatLng point) {
tvLocInfo.setText("New marker added@" + point.toString());
myMap.addMarker(new MarkerOptions().position(point).title(point.toString()));

markerClicked = false;
}

@Override
public boolean onMarkerClick(Marker marker) {

if(markerClicked){

if(polygon != null){
polygon.remove();
polygon = null;
}

polygonOptions.add(marker.getPosition());
polygonOptions.strokeColor(Color.RED);
polygonOptions.fillColor(Color.BLUE);
polygon = myMap.addPolygon(polygonOptions);
}else{
if(polygon != null){
polygon.remove();
polygon = null;
}

polygonOptions = new PolygonOptions().add(marker.getPosition());
markerClicked = true;
}

return true;
}

}



download filesDownload the files.


Next:
- Implement Draggable Marker

Update:
- Google Maps Android API v2 now support anti-clockwise polygons

The series:
A simple example using Google Maps Android API v2, step by step.

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