Android App Development for Phones/Tablets: reverse geocoding

Get Address using Reverse Geocoding and ShowingGoogle Map V2 in Android

======================
GPSTracker .java
=======================
public class GPSTracker extends Service implements LocationListener {

private final Context mContext;

// flag for GPS status
boolean isGPSEnabled = false;

// flag for network status
boolean isNetworkEnabled = false;

// flag for GPS status
boolean canGetLocation = false;

Location location; // location
double latitude; // latitude
double longitude; // longitude

// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

// Declaring a Location Manager
protected LocationManager locationManager;

public GPSTracker(Context context) {
this.mContext = context;
getLocation();
}

public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);

// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);

// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}

} catch (Exception e) {
e.printStackTrace();
}

return location;
}

/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
* */
public void stopUsingGPS(){
if(locationManager != null){
locationManager.removeUpdates(GPSTracker.this);
}
}

/**
* Function to get latitude
* */
public double getLatitude(){
if(location != null){
latitude = location.getLatitude();
}

// return latitude
return latitude;
}

/**
* Function to get longitude
* */
public double getLongitude(){
if(location != null){
longitude = location.getLongitude();
}

// return longitude
return longitude;
}

/**
* Function to check GPS/wifi enabled
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}

/**
* Function to show settings alert dialog
* On pressing Settings button will lauch Settings Options
* */
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

// Setting Dialog Title
alertDialog.setTitle("GPS is settings");

// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});

// on pressing cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});

// Showing Alert Message
alertDialog.show();
}

@Override
public void onLocationChanged(Location location) {

latitude = location.getLatitude();
longitude = location.getLongitude();
}

@Override
public void onProviderDisabled(String provider) {
}

@Override
public void onProviderEnabled(String provider) {
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}

@Override
public IBinder onBind(Intent arg0) {
return null;
}

}

===================================
ShowAddressGoogleMap .java
==================================
public class ShowAddressGoogleMap extends ActionBarActivity {

GoogleMap googleMap;

GPSTracker gps;

double latitude = 0.0;
double longitude = 0.0;

private TextView tvAddress;
private Button btnSave;
private ProgressBar mActivityIndicator;

String addressText;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.showaddressmap);
tvAddress = (TextView) findViewById(R.id.tvAddress);

btnSave = (Button) findViewById(R.id.btnSave);
mActivityIndicator = (ProgressBar) findViewById(R.id.address_progress);
mActivityIndicator.setVisibility(View.GONE);

try {
// Loading map
initilizeMap();

} catch (Exception e) {
e.printStackTrace();
}

setLocation();

btnSave.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {

UIUtils.showToast(getApplicationContext(), ""+addressText);

}
});

}

private void setLocation() {
// TODO Auto-generated method stub
gps = new GPSTracker(this);
// check if GPS enabled
if (gps.canGetLocation()) {

latitude = gps.getLatitude();
longitude = gps.getLongitude();

// \n is for new line
/*
* Toast.makeText( getApplicationContext(),
* "Your Location is - \nLat: " + latitude + "\nLong: " + longitude,
* Toast.LENGTH_LONG).show();
*/

showGoogleMap();

getAddress();
} else {
// can't get location
// GPS or Network is not enabled
// Ask user to enable GPS/network in settings
gps.showSettingsAlert();
}
}

@SuppressLint("NewApi")
public void getAddress() {
// Ensure that a Geocoder services is available
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD
&& Geocoder.isPresent()) {
// Show the activity indicator

/*
* Reverse geocoding is long-running and synchronous. Run it on a
* background thread. Pass the current location to the background
* task. When the task finishes, onPostExecute() displays the
* address.
*/

if (gps.canGetLocation() && gps.isNetworkEnabled) {

(new GetAddressTask(this)).execute(gps.getLocation());
}
else
{
tvAddress.setText("No Internet Connection");
}

}

}

private void showGoogleMap() {

int status = GooglePlayServicesUtil
.isGooglePlayServicesAvailable(getBaseContext());

// Showing status
if (status != ConnectionResult.SUCCESS) {
// Google Play Services are not available

int requestCode = 10;
Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status, this,
requestCode);
dialog.show();

} else {

// googleMap.setMyLocationEnabled(true);

LatLng currentposition = null;
currentposition = new LatLng(latitude, longitude);

// position1

MarkerOptions markerOptions1 = new MarkerOptions();
markerOptions1.position(currentposition);

markerOptions1.title("Your Location");
markerOptions1.snippet("Lat: " + latitude + ", Lng: " + longitude);
markerOptions1.icon(BitmapDescriptorFactory
.fromResource(R.drawable.ic_launcher));

googleMap.addMarker(markerOptions1);

googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(
currentposition, 15));

googleMap.animateCamera(CameraUpdateFactory.zoomTo(15), 2000, null);

}

}

/**
* function to load map. If map is not created it will create it for you
* */
private void initilizeMap() {
if (googleMap == null) {
SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
googleMap = fm.getMap();

// check if map is created successfully or not
if (googleMap == null) {
Toast.makeText(getApplicationContext(),
"Sorry! unable to create maps", Toast.LENGTH_SHORT)
.show();
}
}
}

@Override
protected void onResume() {
super.onResume();
initilizeMap();
}

public class GetAddressTask extends AsyncTask<Location, Void, String> {
Context mContext;

public GetAddressTask(Context context) {
super();
mContext = context;
}

/**
* Get a Geocoder instance, get the latitude and longitude look up the
* address, and return it
*
* @params params One or more Location objects
* @return A string containing the address of the current location, or
* an empty string if no address can be found, or an error
* message
*/
@Override
protected String doInBackground(Location... params) {
mActivityIndicator.setVisibility(View.VISIBLE);
Geocoder geocoder = new Geocoder(mContext, Locale.getDefault());
// Get the current location from the input parameter list
Location loc = params[0];
// Create a list to contain the result address
List<Address> addresses = null;
try {
/*
* Return 1 address.
*/
addresses = geocoder.getFromLocation(loc.getLatitude(),
loc.getLongitude(), 1);
} catch (IOException e1) {
Log.e("LocationSampleActivity",
"IO Exception in getFromLocation()");
e1.printStackTrace();
return ("IO Exception trying to get address");
} catch (IllegalArgumentException e2) {
// Error message to post in the log
String errorString = "Illegal arguments "
+ Double.toString(loc.getLatitude()) + " , "
+ Double.toString(loc.getLongitude())
+ " passed to address service";
Log.e("LocationSampleActivity", errorString);
e2.printStackTrace();
return errorString;
}
// If the reverse geocode returned an address
if (addresses != null && addresses.size() > 0) {
// Get the first address
Address address = addresses.get(0);
/*
* Format the first line of address (if available), city, and
* country name.
*/

addressText = String.format(
"%s, %s, %s, %s ",
// If there's a street address, add it
address.getMaxAddressLineIndex() > 0 ? address
.getAddressLine(0) : "", address
.getAddressLine(1), address.getAddressLine(2), // Locality
// is
// usually
// a
// city

// The country of the address
address.getCountryName());
// Return the text
return addressText;
} else {
return "No address found";
}
}

@Override
protected void onPostExecute(String address) {
// Set activity indicator visibility to "gone"
mActivityIndicator.setVisibility(View.GONE);
// Display the results of the lookup.
tvAddress.setText(address);
}
}
}

=======================

XML Layout file

========================

<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" >

<fragment

android:id="@+id/map"

android:layout_width="match_parent"

android:layout_height="0dp"

android:layout_weight="8.5"

class="com.google.android.gms.maps.SupportMapFragment" />

<RelativeLayout

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:orientation="horizontal"

android:background="#C9C9C9"

<TextView

android:id="@+id/tvAddress"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Address :"

android:textAppearance="?android:attr/textAppearanceMedium" />

<Button

android:id="@+id/btnSave"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentRight="true"

android:layout_alignParentTop="true"

android:text="Save" />

<ProgressBar

android:id="@+id/address_progress"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentTop="true"

android:layout_centerHorizontal="true" />

</RelativeLayout>

</LinearLayout>

======================

AndroidManifest file

=====================

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.your.app"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk

android:minSdkVersion="8"

android:targetSdkVersion="19" />

<permission

android:name="com.infodat.trackme.permission.MAPS_RECEIVE"

android:protectionLevel="signature" />

<uses-feature

android:glEsVersion="0x00020000"

android:required="true" />

<uses-permission android:name="com.infodat.trackme.permission.MAPS_RECEIVE" />

<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />

<uses-permission android:name="android.permission.INTERNET" />

<uses-permission android:name="android.permission.VIBRATE" />

<uses-permission android:name="android.permission.FLASHLIGHT" />

<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

<uses-permission android:name="android.permission.READ_PHONE_STATE" />

<uses-permission android:name="android.permission.CAMERA" />

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

<application

android:allowBackup="true"

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme" >

<activity

android:name="com.your.app.ShowAddressGoogleMap"

android:label="@string/app_name" >

<intent-filter>

</intent-filter>

</activity>

<meta-data

android:name="com.google.android.maps.v2.API_KEY"

android:value="your key" />

</application>

</manifest>

Android App Development for Phones/Tablets

Friday, 18 July 2014

Get Address using Reverse Geocoding and Showing Google Map V2 in Android