Android GPS Location Manager Tutorial
if you are making any location-based application you can follow this tutorial to get Location automatically from LocationTracker.java class.
In this tutorial, I will show you how to get current Location and get an address from latitude and longitude.In this we have
- MainActivity as Activity to get Location on performing Click
- LocationTracker class to get Location
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.androidruler.mymap" >
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
//layout for MainActivity.java
activity_main.xml
<RelativeLayout 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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
<Button
android:id="@+id/getlocation"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="getLocation"
android:layout_above="@+id/location"/>
<TextView
android:id="@+id/location"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"/>
<TextView
android:id="@+id/address"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/location"/>
</RelativeLayout>
MainActivity.java
package com.androidruler.mymap;
import android.app.Activity;
import android.content.Context;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationManager;
import android.support.v4.app.FragmentActivity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import java.util.List;
import java.util.Locale;
public class MainActivity extends Activity {
TextView address,location;
Button getLocation;
LocationTracker tracker;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
address=(TextView)findViewById(R.id.address);
location=(TextView)findViewById(R.id.location);
getLocation=(Button)findViewById(R.id.getlocation);
getLocation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//create LocationTracker Object
tracker=new LocationTracker(MainActivity.this);
// check if location is available
if(tracker.isLocationEnabled)
{
double latitude=tracker.getLatitude();
double longitude=tracker.getLongitude();
location.setText("Your Location is Latitude= " + latitude + " Longitude= " + longitude);
String addres= getCompleteAddressString(latitude,longitude);
address.setText(addres);
}
else
{
// show dialog box to user to enable location
tracker.askToOnLocation();
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private String getCompleteAddressString(double LATITUDE, double LONGITUDE) {
String strAdd = "";
Geocoder geocoder = new Geocoder(this, Locale.getDefault());
try {
List<Address> addresses = geocoder
.getFromLocation(LATITUDE, LONGITUDE, 1);
if (addresses != null) {
android.location.Address returnedAddress = addresses.get(0);
StringBuilder strReturnedAddress = new StringBuilder("");
for (int i = 0; i < returnedAddress.getMaxAddressLineIndex(); i++) {
strReturnedAddress
.append(returnedAddress.getAddressLine(i)).append(
"n");
}
strAdd = strReturnedAddress.toString();
Log.w(" location address", ""+ strReturnedAddress.toString());
} else {
Log.w(" location address", "No Address returned!");
}
} catch (Exception e) {
e.printStackTrace();
Log.w(" location address", "Cannot get Address!");
}
return strAdd;
}
}
//location tracker to get current location updates periodically
LocationTracker.java
package com.androidruler.mymap;
import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.support.annotation.Nullable;
import android.widget.Toast;
/**
* Created by androidruler on 24/02/16.
*/
public class LocationTracker extends Service implements LocationListener {
//declaring Context variable
private final Context con;
//flag for gps
boolean isGPSOn=false;
//flag for network location
boolean isNetWorkEnabled=false;
//flag to getlocation
boolean isLocationEnabled=false;
//minimum distance to request for location update
private static final long MIN_DISTANCE_TO_REQUEST_LOCATION=1; // in meters
// minimum time to request location updates
private static final long MIN_TIME_FOR_UPDATES=1000*1; // 1 sec
//location
Location location;
//latitude and longitude
double latitude,longitude;
//Declaring a LocationManager
LocationManager locationManager;
public LocationTracker(Context context)
{
this.con=context;
checkIfLocationAvailable();
}
public Location checkIfLocationAvailable()
{
try
{
locationManager=(LocationManager)con.getSystemService(LOCATION_SERVICE);
//check for gps availability
isGPSOn=locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
//check for network availablity
isNetWorkEnabled=locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if(!isGPSOn && !isNetWorkEnabled)
{
isLocationEnabled=false;
// no location provider is available show toast to user
Toast.makeText(con,"No Location Provider is Available",Toast.LENGTH_SHORT).show();
}
else {
isLocationEnabled=true;
// if network location is available request location update
if(isNetWorkEnabled)
{
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,MIN_TIME_FOR_UPDATES,MIN_DISTANCE_TO_REQUEST_LOCATION,this);
if(locationManager!=null)
{
location=locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if(location!=null)
{
latitude=location.getLatitude();
longitude=location.getLongitude();
}
}
}
if(isGPSOn)
{
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,MIN_TIME_FOR_UPDATES,MIN_DISTANCE_TO_REQUEST_LOCATION,this);
if(locationManager!=null)
{
location=locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if(location!=null)
{
latitude=location.getLatitude();
longitude=location.getLongitude();
}
}
}
}
}catch (Exception e)
{
}
return location;
}
// call this to stop using location
public void stopUsingLocation()
{
if(locationManager!=null)
{
locationManager.removeUpdates(LocationTracker.this);
}
}
// call this to getLatitude
public double getLatitude()
{
if(location!=null)
{
latitude=location.getLatitude();
}
return latitude;
}
//call this to getLongitude
public double getLongitude()
{
if(location!=null)
{
longitude=location.getLongitude();
}
return longitude;
}
public boolean isLocationEnabled() {
return this.isLocationEnabled;
}
//call to open settings and ask to enable Location
public void askToOnLocation()
{
AlertDialog.Builder dialog=new AlertDialog.Builder(con);
//set title
dialog.setTitle("Settings");
//set Message
dialog.setMessage("Location is not Enabled.Do you want to go to settings to enable it?");
// on pressing this will be called
dialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intent=new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
con.startActivity(intent);
}
});
//on Pressing cancel
dialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// show Dialog box
dialog.show();
}
@Override
public void onLocationChanged(Location location) {
this.location=location;
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
}