RetroArch/android/phoenix/src/com/retroarch/browser/RetroActivityLocation.java

package com.retroarch.browser;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesClient;
import com.google.android.gms.location.LocationClient;
import com.google.android.gms.location.LocationRequest;
import com.retroarch.browser.preferences.util.UserPreferences;

import android.app.NativeActivity;
import android.content.IntentSender;
import android.content.SharedPreferences;
import android.location.Location;
import android.location.LocationListener;
import android.os.Bundle;
import android.widget.Toast;

public class RetroActivityLocation extends NativeActivity
implements GooglePlayServicesClient.ConnectionCallbacks,
GooglePlayServicesClient.OnConnectionFailedListener,
LocationListener
{
	/* LOCATION VARIABLES */
	private static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 0;
	private LocationClient mLocationClient = null;
    private Location mCurrentLocation;
    //TODO - FIXME: We will want to make most of this configurable
    // Milliseconds per second
    private static final int MILLISECONDS_PER_SECOND = 1000;
    // Update frequency in seconds
    public static final int UPDATE_INTERVAL_IN_SECONDS = 5;
    // Update frequency in milliseconds
    private static final long UPDATE_INTERVAL =
            MILLISECONDS_PER_SECOND * UPDATE_INTERVAL_IN_SECONDS;
    // The fastest update frequency, in seconds
    private static final int FASTEST_INTERVAL_IN_SECONDS = 1;
    // A fast frequency ceiling in milliseconds
    private static final long FASTEST_INTERVAL =
            MILLISECONDS_PER_SECOND * FASTEST_INTERVAL_IN_SECONDS;
    // Define an object that holds accuracy and frequency parameters
    LocationRequest mLocationRequest = null;
    boolean mUpdatesRequested = false;
    boolean location_service_running = false;
	
    /*
     * 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();
        // If already requested, start periodic updates
        if (mUpdatesRequested)
        {
            mLocationClient.requestLocationUpdates(mLocationRequest,
            		(com.google.android.gms.location.LocationListener) this);
        }
    }
    
    /*
     * 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 cancelled 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());
        }
    }
    
	public void onLocationInit()
	{
        /*
         * Create a new location client, using the enclosing class to
         * handle callbacks.
         */
		if (mLocationClient == null)
			mLocationClient = new LocationClient(this, this, this);
        // Start with updates turned off
        mUpdatesRequested = false;

        //TODO - FIXME
        /* Split this logic up into a separate function
         * and make it configurable - callback parameters
         * should be configurable
         */

        // Create the LocationRequest object
        if (mLocationRequest == null)
        	mLocationRequest = LocationRequest.create();
        // Use high accuracy
        mLocationRequest.setPriority(
                LocationRequest.PRIORITY_HIGH_ACCURACY);
        // Set the update interval to 5 seconds
        mLocationRequest.setInterval(UPDATE_INTERVAL);
        // Set the fastest update interval to 1 second
        mLocationRequest.setFastestInterval(FASTEST_INTERVAL);

	}
	
	public void onLocationStart()
	{
		if (location_service_running)
			return;
		
        // Connect the client.
        mLocationClient.connect();
        
        // Get last known location
        mCurrentLocation = mLocationClient.getLastLocation();
        location_service_running = true;
	}
	
	public void onLocationStop()
	{
		if (!location_service_running)
			return;
		
		// If the client is connected
        if (mLocationClient.isConnected())
        {
            /*
             * Remove location updates for a listener.
             * The current Activity is the listener, so
             * the argument is "this".
             */
        	mLocationClient.removeLocationUpdates((com.google.android.gms.location.LocationListener) this);
        }
        
        if (location_service_running)
        {
    		// Disconnecting the client invalidates it.
        	mLocationClient.disconnect();
        }
        location_service_running = false;
	}
	
	public double onLocationGetLatitude()
	{
		return mCurrentLocation.getLatitude();
	}
	
	public double onLocationGetLongitude()
	{
		return mCurrentLocation.getLongitude();
	}
	
    // Define the callback method that receives location updates
    @Override
    public void onLocationChanged(Location location) {
    	mCurrentLocation = location;
        // Report to the UI that the location was updated
        String msg = "Updated Location: " +
                Double.toString(location.getLatitude()) + "," +
                Double.toString(location.getLongitude());
        Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
    }
    
    public void onStatusChanged(String provider, int status, Bundle extras) {}

    public void onProviderEnabled(String provider) {}

    public void onProviderDisabled(String provider) {}
    
	@Override
	public void onPause()
	{
        // Save the current setting for updates
		SharedPreferences prefs = UserPreferences.getPreferences(this);
		SharedPreferences.Editor edit = prefs.edit();
		edit.putBoolean("LOCATION_UPDATES_ON", mUpdatesRequested);
		edit.commit();
		
		super.onPause();
	}
	
	@Override
	public void onResume()
	{
		SharedPreferences prefs = UserPreferences.getPreferences(this);
		SharedPreferences.Editor edit = prefs.edit();
		
        /*
         * Get any previous setting for location updates
         * Gets "false" if an error occurs
         */
        if (prefs.contains("LOCATION_UPDATES_ON"))
        {
            mUpdatesRequested = prefs.getBoolean("LOCATION_UPDATES_ON", false);
            if (mUpdatesRequested)
            	location_service_running = true;
        // Otherwise, turn off location updates
        }
        else
        {
            edit.putBoolean("LOCATION_UPDATES_ON", false);
            edit.commit();
            location_service_running = false;
        }

		super.onResume();
	}
	
	@Override
	public void onStop()
	{
		onLocationStop();
        super.onStop();
	}
}