Android Developers Maximum: Android code sample: Google Maps Android API v2

Showing posts with label Android code sample: Google Maps Android API v2. Show all posts

Draw Polyline from touched location to MyLocation

In this exercise, Google Maps Android API v2 is implemented with MyLocation enabled. When user LongClick on the Map, a marker will be drawn, and a Polyline from touched location to MyLocation will be drawn if MyLocation is available.

To get MyLocation programmatically, you have to enable my-location layer by calling setMyLocationEnabled(true). Then call getMyLocation(), it returns the currently displayed user location, or null if there is no location data available. Please noted that MyLocation may be need long time to available.

MainActivity.java

package com.example.androidmapex;

import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapLongClickListener;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.PolylineOptions;

import android.location.Location;
import android.os.Bundle;
import android.widget.Toast;
import android.app.Activity;
import android.app.FragmentManager;

public class MainActivity extends Activity{
 
 private GoogleMap myMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        FragmentManager myFragmentManager = getFragmentManager();
        MapFragment myMapFragment1 = 
          (MapFragment)myFragmentManager.findFragmentById(R.id.map1);

        myMap = myMapFragment1.getMap();
        myMap.setMyLocationEnabled(true);
        myMap.setOnMapLongClickListener(myOnMapLongClickListener);

    }
 
 OnMapLongClickListener myOnMapLongClickListener =
   new OnMapLongClickListener(){

    @Override
    public void onMapLongClick(LatLng point) {
     myMap.addMarker(new MarkerOptions()
          .position(point)
          .title(point.toString()));
     
     Location myLocation = myMap.getMyLocation();
     if(myLocation == null){
      Toast.makeText(getApplicationContext(), 
        "My location not available", 
        Toast.LENGTH_LONG).show();
     }else{
      PolylineOptions polylineOptions = new PolylineOptions();
      polylineOptions.add(point);
      polylineOptions.add(
        new LatLng(myLocation.getLatitude(), myLocation.getLongitude()));
      myMap.addPolyline(polylineOptions);
     }
    }
  
 };
    
}

layout

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <fragment
        android:id="@+id/map1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="5px"
        class="com.google.android.gms.maps.MapFragment"/>

</LinearLayout>

Download the files.

The series:

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

Retain instance of MapFragment

In the last exercise of "Dual MapFragment", if the device orientation changed, the display area and zoom level will be kept, but the added marker will disappear.

In this exercise, we are going to modify map2 from last post, to retain instance after orientation changed.

To keep the markers after orientation changed, create custom MapFragment (RetainMapFragment), override onActivityCreated() call setRetainInstance(true).

package com.example.androidmapex;

import android.os.Bundle;

import com.google.android.gms.maps.MapFragment;

public class RetainMapFragment extends MapFragment {

 @Override
 public void onActivityCreated(Bundle savedInstanceState) {
  super.onActivityCreated(savedInstanceState);
  setRetainInstance(true);
 }

}

Modify layout file to use "com.example.androidmapex.RetainMapFragment" class on map2.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <fragment
        android:id="@+id/map1"
        android:layout_width="match_parent"
        android:layout_height="0px"
        android:layout_weight="2"
        android:layout_margin="5px"
        class="com.google.android.gms.maps.MapFragment"/>
    <fragment
        android:id="@+id/map2"
        android:layout_width="match_parent"
        android:layout_height="0px"
        android:layout_weight="3"
        android:layout_margin="5px"
        class="com.example.androidmapex.RetainMapFragment"/>

</LinearLayout>

Modify MainActivity to use define myMapFragment2 as RetainMapFragment.

package com.example.androidmapex;

import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapLongClickListener;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.BitmapDescriptor;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

import android.os.Bundle;
import android.app.Activity;
import android.app.FragmentManager;

public class MainActivity extends Activity{
 
 private GoogleMap myMap1, myMap2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        FragmentManager myFragmentManager = getFragmentManager();
        MapFragment myMapFragment1 = 
          (MapFragment)myFragmentManager.findFragmentById(R.id.map1);
        RetainMapFragment myMapFragment2 = 
          (RetainMapFragment)myFragmentManager.findFragmentById(R.id.map2);
        myMap1 = myMapFragment1.getMap();
        myMap2 = myMapFragment2.getMap();
        
        myMap1.setOnMapLongClickListener(my1_OnMapLongClickListener);
        myMap2.setOnMapLongClickListener(my2_OnMapLongClickListener);
    }
 
 OnMapLongClickListener my1_OnMapLongClickListener =
   new OnMapLongClickListener(){

    @Override
    public void onMapLongClick(LatLng point) {
     myMap1.addMarker(new MarkerOptions()
          .position(point)
          .title(point.toString()));
    }
  
 };
 
 OnMapLongClickListener my2_OnMapLongClickListener =
   new OnMapLongClickListener(){

    @Override
    public void onMapLongClick(LatLng point) {
     
     BitmapDescriptor bitmapDescriptor = 
       BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE);
     
     myMap2.addMarker(new MarkerOptions()
          .position(point)
          .icon(bitmapDescriptor)
          .title(point.toString()));
    }
  
 };
    
}

Related:
- Retain data using Fragment API setRetainInstance()

download files

Download the files.

The series:

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

Dual MapFragment of Google Maps Android API v2

This exercise demonstrate how to embed two MapFragment in a Activity.

Modify layout file to have two fragment of "com.google.android.gms.maps.MapFragment".

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <fragment
        android:id="@+id/map1"
        android:layout_width="match_parent"
        android:layout_height="0px"
        android:layout_weight="2"
        android:layout_margin="5px"
        class="com.google.android.gms.maps.MapFragment"/>
    <fragment
        android:id="@+id/map2"
        android:layout_width="match_parent"
        android:layout_height="0px"
        android:layout_weight="3"
        android:layout_margin="5px"
        class="com.google.android.gms.maps.MapFragment"/>

</LinearLayout>

Modify MainActivity.java to handle the Maps separately.

package com.example.androidmapex;

import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapLongClickListener;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.BitmapDescriptor;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

import android.os.Bundle;
import android.app.Activity;
import android.app.FragmentManager;

public class MainActivity extends Activity{
 
 private GoogleMap myMap1, myMap2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        FragmentManager myFragmentManager = getFragmentManager();
        MapFragment myMapFragment1 = 
          (MapFragment)myFragmentManager.findFragmentById(R.id.map1);
        MapFragment myMapFragment2 = 
          (MapFragment)myFragmentManager.findFragmentById(R.id.map2);
        myMap1 = myMapFragment1.getMap();
        myMap2 = myMapFragment2.getMap();
        
        myMap1.setOnMapLongClickListener(my1_OnMapLongClickListener);
        myMap2.setOnMapLongClickListener(my2_OnMapLongClickListener);
    }
 
 OnMapLongClickListener my1_OnMapLongClickListener =
   new OnMapLongClickListener(){

    @Override
    public void onMapLongClick(LatLng point) {
     myMap1.addMarker(new MarkerOptions()
          .position(point)
          .title(point.toString()));
    }
  
 };
 
 OnMapLongClickListener my2_OnMapLongClickListener =
   new OnMapLongClickListener(){

    @Override
    public void onMapLongClick(LatLng point) {
     
     BitmapDescriptor bitmapDescriptor = 
       BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE);
     
     myMap2.addMarker(new MarkerOptions()
          .position(point)
          .icon(bitmapDescriptor)
          .title(point.toString()));
    }
  
 };
    
}

Download the files.

The series:

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

Draw hollow Polygon on Map, using addHole() method

Example to draw hollow Polygon on Map, on user clicked location.

Refer to Google document to create hollow Polygon. It demonstrate with addHole(LatLng... points), actually I can only found addHole(Iterable<latlng> points) in com.google.android.gms.maps.model.PolygonOptions class! This example demonstrate how to apply Iterable<latlng> on PolygonOptions.

(related: What is Iterable?)

Modify java code from the last exercise of "Draw tranparent circle".

package com.example.androidmapsv2;

import java.util.ArrayList;
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.MapFragment;
import com.google.android.gms.maps.model.Circle;
import com.google.android.gms.maps.model.LatLng;
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.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{
 
 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);

 }
 
 @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) {
  
  //generate points on outter path
  ArrayList<LatLng> outter = new ArrayList<LatLng>();  
  outter.add(new LatLng(point.latitude-5, point.longitude-5)); 
  outter.add(new LatLng(point.latitude-5, point.longitude+5)); 
  outter.add(new LatLng(point.latitude+5, point.longitude+5)); 
  outter.add(new LatLng(point.latitude+5, point.longitude-5));
  
  //generate points on inner path
  ArrayList<LatLng> inner = new ArrayList<LatLng>();  
  inner.add(new LatLng(point.latitude-4, point.longitude-4)); 
  inner.add(new LatLng(point.latitude-4, point.longitude+4)); 
  inner.add(new LatLng(point.latitude+4, point.longitude+4)); 
  inner.add(new LatLng(point.latitude+4, point.longitude-4));
   
  PolygonOptions polygonOptions = 
    new PolygonOptions()
     .addAll(outter)
     .addHole(inner)
     .fillColor(Color.BLUE)
     .strokeWidth(1);

  myMap.addPolygon(polygonOptions);
 }

}

Download the files.

The series:

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

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.

Implement OnMyLocationChangeListener for Google Maps Android API v2

With Google Play services v3.0, and Android SDK Platform-tools with Google Play Services updated, we can implement OnMyLocationChangeListener, called when the Location of the My Location dot has changed.

Modify the Java code from the last 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.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMyLocationChangeListener;
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.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 OnMyLocationChangeListener{
 
 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.setMyLocationEnabled(true);
  myMap.setOnMyLocationChangeListener(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 onMyLocationChange(Location location) {
  tvLocInfo.setText("New circle added@" + location.toString());
  
  LatLng locLatLng = new LatLng(location.getLatitude(), location.getLongitude());
  double accuracy = location.getAccuracy();
  
  if(myCircle == null){
   CircleOptions circleOptions = new CircleOptions()
   .center(locLatLng)   //set center
   .radius(accuracy)   //set radius in meters
   .fillColor(Color.RED)
   .strokeColor(Color.BLACK)
   .strokeWidth(5);
   
   myCircle = myMap.addCircle(circleOptions);
  }else{
   myCircle.setCenter(locLatLng);
   myCircle.setRadius(accuracy);
  }
  
  myMap.animateCamera(CameraUpdateFactory.newLatLng(locLatLng));

 }

}

Download the files.

The series:

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

Draw Circle on GoogleMap

With Google Play services v3.0, now we can draw circle on Google Maps API V2. To use the new feature, you have to update Android SDK Platform-tools.

The code modify from the exercise of 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.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapLongClickListener;
import com.google.android.gms.maps.MapFragment;
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 OnMapLongClickListener{
 
 final int RQS_GooglePlayServices = 1;
 private GoogleMap myMap;
 
 TextView tvLocInfo;

 @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.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 onMapLongClick(LatLng point) {
  tvLocInfo.setText("New circle added@" + point.toString());
  
  CircleOptions circleOptions = new CircleOptions()
  .center(point)   //set center
  .radius(1000)   //set radius in meters
  .fillColor(Color.RED)
  .strokeColor(Color.BLACK)
  .strokeWidth(5);
  
  myMap.addCircle(circleOptions);
 }

}

Download the files.

Next: Draw tranparent circle

The series:

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

Convert between LatLng and Location

This example demonstrate how to convert between LatLng and Location. Refer onMapClick() in the code.

package com.example.androidmapsv2;

import java.util.Date;

import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapClickListener;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

import android.location.Location;
import android.os.Bundle;
import android.app.Activity;
import android.app.FragmentManager;
import android.widget.TextView;

public class MainActivity extends Activity 
 implements OnMapClickListener{

 private GoogleMap myMap;
 
 TextView info;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        FragmentManager myFragmentManager = getFragmentManager();
        MapFragment myMapFragment = 
          (MapFragment)myFragmentManager.findFragmentById(R.id.map);
        myMap = myMapFragment.getMap();
        
        myMap.setOnMapClickListener(this);
        
        info = (TextView)findViewById(R.id.info);

        myMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
        myMap.getUiSettings().setZoomControlsEnabled(true);
        myMap.getUiSettings().setCompassEnabled(true);
        myMap.getUiSettings().setAllGesturesEnabled(true);
    }



 @Override
 public void onMapClick(LatLng point) {
  //myMap.addMarker(new MarkerOptions().position(point).title(point.toString()));

  //The code below demonstrate how to convert between LatLng and Location
  
  //Convert LatLng to Location
  Location location = new Location("Test");
  location.setLatitude(point.latitude);
  location.setLongitude(point.longitude);
  location.setTime(new Date().getTime()); //Set time as current Date
  info.setText(location.toString());
  
  //Convert Location to LatLng
  LatLng newLatLng = new LatLng(location.getLatitude(), location.getLongitude());
  
  MarkerOptions markerOptions = new MarkerOptions()
           .position(newLatLng)
           .title(newLatLng.toString());
  
  myMap.addMarker(markerOptions);

 }

}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

 <TextView 
     android:id="@+id/info"
     android:layout_width="match_parent"
     android:layout_height="wrap_content" />

    <fragment
        android:id="@+id/map"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        class="com.google.android.gms.maps.MapFragment"/>

</LinearLayout>

The series:

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