Android How to get device current speed using GPS | Get current speed using Network and GPS in Android

This simple code for getting device current speed using GPS. you can use Network Provider also..

package com.geofence.alarm;

import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.Toast;

import com.example.geofenceapp.R;

public class SpeedAlarmActivity extends Activity {
	Context context;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_speed_alarm);
		// Acquire a reference to the system Location Manager
		LocationManager locationManager = (LocationManager) this
				.getSystemService(Context.LOCATION_SERVICE);

		// Define a listener that responds to location updates
		LocationListener locationListener = new LocationListener() {
			public void onLocationChanged(Location location) {
				location.getLatitude();
				Toast.makeText(context, "Current speed:" + location.getSpeed(),
						Toast.LENGTH_SHORT).show();

			}

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

			public void onProviderEnabled(String provider) {
			}

			public void onProviderDisabled(String provider) {
			}
		};
		locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,
				0, locationListener);

	}

}

Thanks,