Draw tranparent circle for Google Maps Android API v2

This exercise demonstrate how to draw tranparent circle for Google Maps Android API v2. To create a CircleOptions with TRANSPARENT collor, call fillColor(Color.TRANSPARENT) method; actually it's the default value. We can also set the most signification byte of the parameter to make it semi-tranparent.

Modify from the exercise "Draw Circle 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.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapClickListener;
import com.google.android.gms.maps.GoogleMap.OnMapLongClickListener;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.Circle;
import com.google.android.gms.maps.model.CircleOptions;
import com.google.android.gms.maps.model.LatLng;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.FragmentManager;
import android.graphics.Color;
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{
 
 final int RQS_GooglePlayServices = 1;
 private GoogleMap myMap;
 
 TextView tvLocInfo;
 
 Circle myCircle;

 @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.setMapType(GoogleMap.MAP_TYPE_HYBRID);
  
  myMap.setOnMapClickListener(this);
  myMap.setOnMapLongClickListener(this);

 }
 
 @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) {
  CircleOptions circleOptions = new CircleOptions()
  .center(point)   //set center
  .radius(500)   //set radius in meters
  .fillColor(Color.TRANSPARENT)  //default
  .strokeColor(Color.BLUE)
  .strokeWidth(5);
  
  myCircle = myMap.addCircle(circleOptions);
 }

 @Override
 public void onMapLongClick(LatLng point) {
  CircleOptions circleOptions = new CircleOptions()
  .center(point)   //set center
  .radius(500)   //set radius in meters
  .fillColor(0x40ff0000)  //semi-transparent
  .strokeColor(Color.BLUE)
  .strokeWidth(5);
  
  myCircle = myMap.addCircle(circleOptions);
  
 }

}

Download the files.

The series:

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