How to add location in your application

Android mobile has many new features and many new technologies use. one of the most useful features is that add the your location in your mobile phones or a android application. you can go anywhere and you easily pin your current location in social sites or professional work.android os provide the tracking system and find out the path for your destination.

Retrieving current location :

This api maintain the automatically user's current location.The accuracy of the retrieve the current location of the user is based on the how location sensor work and the location permission which done by the users.for find out the users current location we need the LocationClient class . instance of this class is carried out the location of users and deliver to application.

How to get permission in the application :

Android has two types of permission for retrieving the current location. both permission is here  ACCESS_FINE_LOCATION. and ACCESS_COARSE_LOCATION choose any one and retrieve the current location.user permission add into the manifest element by this syntax. for get the more accurate current location use the fine location permission. 

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

 Check for google play service:

location service is part of the google map apk. so you need to check for install the apk before the location service is being for check apk is installed call the this function   GooglePlayServicesUtil.isGooglePlayServicesAvailable(), It returns the resultcode for the connection results if error is fired the call GooglePlayServicesUtil.getErrorDialog().Here give the snippets given in below is useful for the check the google play service.

public class MainActivity extends FragmentActivity {
    ...
    // Global constants
    /*
     * Define a request code to send to Google Play services
     * This code is returned in Activity.onActivityResult
     */
    private final static int
            CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;
    ...
    // Define a DialogFragment that displays the error dialog
    public static class ErrorDialogFragment extends DialogFragment {
        // Global field to contain the error dialog
        private Dialog mDialog;
        // Default constructor. Sets the dialog field to null
        public ErrorDialogFragment() {
            super();
            mDialog = null;
        }
        // Set the dialog to display
        public void setDialog(Dialog dialog) {
            mDialog = dialog;
        }
        // Return a Dialog to the DialogFragment.
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            return mDialog;
        }
    }
    ...
    /*
     * Handle results returned to the FragmentActivity
     * by Google Play services
     */
    @Override
    protected void onActivityResult(
            int requestCode, int resultCode, Intent data) {
        // Decide what to do based on the original request code
        switch (requestCode) {
            ...
            case CONNECTION_FAILURE_RESOLUTION_REQUEST :
            /*
             * If the result code is Activity.RESULT_OK, try
             * to connect again
             */
                switch (resultCode) {
                    case Activity.RESULT_OK :
                    /*
                     * Try the request again
                     */
                    ...
                    break;
                }
            ...
        }
     }
    ...
    private boolean servicesConnected() {
        // Check that Google Play services is available
        int resultCode =
                GooglePlayServicesUtil.
                        isGooglePlayServicesAvailable(this);
        // If Google Play services is available
        if (ConnectionResult.SUCCESS == resultCode) {
            // In debug mode, log the status
            Log.d("Location Updates",
                    "Google Play services is available.");
            // Continue
            return true;
        // Google Play services was not available for some reason.
        // resultCode holds the error code.
        } else {
            // Get the error dialog from Google Play services
            Dialog errorDialog = GooglePlayServicesUtil.getErrorDialog(
                    resultCode,
                    this,
                    CONNECTION_FAILURE_RESOLUTION_REQUEST);

            // If Google Play services can provide an error dialog
            if (errorDialog != null) {
                // Create a new DialogFragment for the error dialog
                ErrorDialogFragment errorFragment =
                        new ErrorDialogFragment();
                // Set the dialog in the DialogFragment
                errorFragment.setDialog(errorDialog);
                // Show the error dialog in the DialogFragment
                errorFragment.show(getSupportFragmentManager(),
                        "Location Updates");
            }
        }
    }
    ...
}

Location services :

To get the current location of the client frist of all its connect to location services.tis sevices used the getLastLocation() method.Its return the latest and best value .For retrieve the location you just need the turn on the current locat5ion sensor.

Here 2 interface are specified ConnectionCallbacks and OnConnectionFailedListener in this methods.

public class MainActivity extends FragmentActivity implements
        GooglePlayServicesClient.ConnectionCallbacks,
        GooglePlayServicesClient.OnConnectionFailedListener {
    ...
    /*
     * Called by Location Services when the request to connect the
     * client finishes successfully. At this point, you can
     * request the current location or start periodic updates
     */
    @Override
    public void onConnected(Bundle dataBundle) {
        // Display the connection status
        Toast.makeText(this, "Connected", Toast.LENGTH_SHORT).show();

    }
    ...
    /*
     * Called by Location Services if the connection to the
     * location client drops because of an error.
     */
    @Override
    public void onDisconnected() {
        // Display the connection status
        Toast.makeText(this, "Disconnected. Please re-connect.",
                Toast.LENGTH_SHORT).show();
    }
    ...
    /*
     * Called by Location Services if the attempt to
     * Location Services fails.
     */
    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        /*
         * Google Play services can resolve some errors it detects.
         * If the error has a resolution, try sending an Intent to
         * start a Google Play services activity that can resolve
         * error.
         */
        if (connectionResult.hasResolution()) {
            try {
                // Start an Activity that tries to resolve the error
                connectionResult.startResolutionForResult(
                        this,
                        CONNECTION_FAILURE_RESOLUTION_REQUEST);
                /*
                 * Thrown if Google Play services canceled the original
                 * PendingIntent
                 */
            } catch (IntentSender.SendIntentException e) {
                // Log the error
                e.printStackTrace();
            }
        } else {
            /*
             * If no resolution is available, display a dialog to the
             * user with the error.
             */
            showErrorDialog(connectionResult.getErrorCode());
        }
    }
    ...
}

How to connect the location client :

Here 3 m3thod are created ... onCreate() ,onstart() and onstop methods.YOu should create the location client in oncreate(0 and it goes to onstart() mode and retrieve the recent user's location. LOcation sensor maintain the current location of the user's and make visible it . after then disconnect to the client it called the onstop().it means now location services not maintain the current location.

public class MainActivity extends FragmentActivity implements
        GooglePlayServicesClient.ConnectionCallbacks,
        GooglePlayServicesClient.OnConnectionFailedListener {
    ...
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        ...
        /*
         * Create a new location client, using the enclosing class to
         * handle callbacks.
         */
        mLocationClient = new LocationClient(this, this, this);
        ...
    }
    ...
    /*
     * Called when the Activity becomes visible.
     */
    @Override
    protected void onStart() {
        super.onStart();
        // Connect the client.
        mLocationClient.connect();
    }
    ...
    /*
     * Called when the Activity is no longer visible.
     */
    @Override
    protected void onStop() {
        // Disconnecting the client invalidates it.
        mLocationClient.disconnect();
        super.onStop();
    }
    ...
}

Get the current location :

After the implement in the location services then it time to get the current location.For retrive the recent current location call the getloaction() methods. 

public class MainActivity extends FragmentActivity implements
        GooglePlayServicesClient.ConnectionCallbacks,
        GooglePlayServicesClient.OnConnectionFailedListener {
    ...
    // Global variable to hold the current location
    Location mCurrentLocation;
    ...
    mCurrentLocation = mLocationClient.getLastLocation();
    ...
}

implement all this method you will get the current location of your's. you just need the data usages permission and the location sensor make turn on.after the you will get the most recent and best value of your location.