Implement OnMyLocationChangeListener for Google Maps Android API v2

Anonymous

17:01

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.

Implement OnMyLocationChangeListener for Google Maps Android API v2

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));

 }

}