Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import android.app.Activity;

import android.content.Context;

import android.location.Location;

import android.location.LocationManager;

public class Main {
    /** A reference to the system Location Manager. */
    private static LocationManager mLocationManager;

    /** Returns the last known location longitude. Use this if you know that the location listener
     * doesn't need to turn on. This first tries GPS, then network, and returns 0.0 if GPS nor Network is enabled. */
    public static final double getLastKnownLocationLongitude() {
        loadLocationManager();
        double longitude = 0.0;
        // Load last known location coordinate, if available, so that user doesn't have to wait as long for a location.
        if (isGpsEnabled()) {
            Location gpsLocation = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            if (gpsLocation != null) {
                longitude = gpsLocation.getLongitude();
            }
        } else if (isNetworkEnabled()) {
            Location networkLocation = mLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
            if (networkLocation != null) {
                longitude = networkLocation.getLongitude();
            }
        }
        return longitude;
    }

    /** Instantiates the mLocationManager variable if needed. */
    private static final void loadLocationManager() {
        // TODO: Don't get Application context this way. Either pass in a static way of getting app context like in second line, or create a constructor to accept the context.
        if (mLocationManager == null) {
            mLocationManager = (LocationManager) (new Activity().getApplicationContext())
                    .getSystemService(Context.LOCATION_SERVICE);
        }
        //      if (mLocationManager == null) { mLocationManager = (LocationManager) MyApp.getContext().getSystemService(Context.LOCATION_SERVICE); }
    }

    /** Returns true if GPS provider is enabled, otherwise false. */
    public static final boolean isGpsEnabled() {
        loadLocationManager();
        try {
            return mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
        } catch (Exception e) {
            // If exception occurs, then there is no GPS provider available.
            return false;
        }
    }

    /** Returns true if network provider is enabled, otherwise false. */
    public static final boolean isNetworkEnabled() {
        loadLocationManager();
        try {
            return mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
        } catch (Exception e) {
            // If exception occurs, then there is no network provider available.
            return false;
        }
    }
}