Android實現定位

簡單定位工具類

/**
 *  簡單定位工具類
 */
public class LocationUtil {
    private volatile static LocationUtil uniqueInstance;
    private LocationManager locationManager;
    private String locationProvider;
    private Location location;
    private Context mContext;

    private LocationUtil(Context context) {
        mContext = context;
        getLocation();
    }

    //採用Double CheckLock(DCL)實現單例
    public static LocationUtil getInstance(Context context) {
        if (uniqueInstance == null) {
            synchronized (LocationUtil.class) {
                if (uniqueInstance == null) {
                    uniqueInstance = new LocationUtil( context );
                }
            }
        }
        return uniqueInstance;
    }

    private void getLocation() {
        //1.獲取位置管理器
        locationManager = (LocationManager) mContext.getSystemService( Context.LOCATION_SERVICE );
        //2.獲取位置提供器，GPS或是NetWork
        List<String> providers = locationManager.getProviders( true );
        if (providers.contains( LocationManager.NETWORK_PROVIDER )) {
            //如果是網絡定位
            locationProvider = LocationManager.NETWORK_PROVIDER;
        } else if (providers.contains( LocationManager.GPS_PROVIDER )) {
            //如果是GPS定位
            locationProvider = LocationManager.GPS_PROVIDER;
        } else {
            //沒有可用的位置提供器
            return;
        }
        //3.獲取上次的位置，一般第一次運行，此值爲null
        Location location = locationManager.getLastKnownLocation( locationProvider );
        if (location != null) {
            setLocation( location );
        }
        // 監視地理位置變化，第二個和第三個參數分別爲更新的最短時間minTime和最短距離minDistace
        locationManager.requestLocationUpdates( locationProvider, 0, 0, locationListener );
    }

    private void setLocation(Location location) {
        this.location = location;
        String address = "緯度：" + location.getLatitude() + "經度：" + location.getLongitude();
    }

    //獲取經緯度
    public Location showLocation() {
        return location;
    }

    // 移除定位監聽
    public void removeLocationUpdatesListener() {
        if (locationManager != null) {
            uniqueInstance = null;
            locationManager.removeUpdates( locationListener );
        }
    }
    /**
     * LocationListern監聽器
     * 參數：地理位置提供器、監聽位置變化的時間間隔、位置變化的距離間隔、LocationListener監聽器
     */

    LocationListener locationListener = new LocationListener() {
        /**
         * 當某個位置提供者的狀態發生改變時
         */
        @Override
        public void onStatusChanged(String provider, int status, Bundle arg2) {
        }
        /**
         * 某個設備打開時
         */
        @Override
        public void onProviderEnabled(String provider) {
        }

        /**
         * 某個設備關閉時
         */
        @Override
        public void onProviderDisabled(String provider) {
        }

        /**
         * 手機位置發生變動
         */
        @Override
        public void onLocationChanged(Location location) {
            location.getAccuracy();//精確度
            setLocation( location );
        }
    };
}

調用工具類中的方法

private void getLocation() {
        Location location = LocationUtil.getInstance(this).showLocation();
        if (location != null) {
            String address = "緯度：" + location.getLatitude() + "經度：" + location.getLongitude();
            //獲取維度信息
            lat = location.getLatitude() + "";
            //獲取經度信息
            lng = location.getLongitude() + "";
        } else {
            //location is null
        }
    }

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