2021-09-10 定位工具类 LocationUtils

public class LocationUtils {
    private static final String TAG = "Utils.Location";

    private volatile static LocationUtils uniqueInstance;
    private LocationManager locationManager;
    private Context mContext;
    private AddressCallback addressCallback;

    public AddressCallback getAddressCallback() {
        return addressCallback;
    }

    public void setAddressCallback(AddressCallback addressCallback) {
        this.addressCallback = addressCallback;
        if (isInit) {
            showLocation();
        } else {
            isInit = true;
        }
    }

    private static Location location;
    private boolean isInit = false;//是否加载过

    private LocationUtils(Context context) {
        mContext = context;
        //getLocation();
        locationManager = (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);
    }

    public static LocationUtils getInstance(Context context) {
        if (uniqueInstance == null) {
            synchronized (LocationUtils.class) {
                if (uniqueInstance == null) {
                    uniqueInstance = new LocationUtils(context);
                }
            }
        }
        return uniqueInstance;
    }

    /**
     * 添加回调事件
     *
     * @param addressCallback
     */
    private void addAddressCallback(AddressCallback addressCallback) {
        if (isInit) {
            showLocation();
        }
    }

    public void start(){
        getLocation();
    }

    private void getLocation() {
        //1.获取位置管理器
        //locationManager = (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);
        //添加用户权限申请判断
        if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
                && ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            Log.w(TAG, "请开启权限");
            return;
        }
        //2.获取位置提供器，GPS或是NetWork
        // 获取所有可用的位置提供器
        List<String> providerList = locationManager.getProviders(true);
        String locationProvider;
        if (providerList.contains(LocationManager.GPS_PROVIDER)) {
            //GPS 定位的精准度比较高，但是非常耗电。
            Log.v(TAG, "GPS_PROVIDER");
            locationProvider = LocationManager.GPS_PROVIDER;
        } else if (providerList.contains(LocationManager.NETWORK_PROVIDER)) {//Google服务被墙不可用
            //网络定位的精准度稍差，但耗电量比较少。
            Log.v(TAG, "NETWORK_PROVIDER");
            locationProvider = LocationManager.NETWORK_PROVIDER;
        } else {
            Log.v(TAG, "NO_PROVIDER");
            // 当没有可用的位置提供器时，弹出Toast提示用户
            Intent intent = new Intent();
            intent.setAction(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            mContext.startActivity(intent);
            return;
        }

        //3.获取上次的位置，一般第一次运行，此值为null
        location = locationManager.getLastKnownLocation(locationProvider);
        if (location != null) {
            // 显示当前设备的位置信息
            Log.v(TAG, "显示当前设备的位置信息");
            showLocation();
        } else {//当GPS信号弱没获取到位置的时候可从网络获取
            Log.v(TAG, "Google服务被墙的解决办法");
            getLngAndLatWithNetwork();//Google服务被墙的解决办法
        }
        // 监视地理位置变化，第二个和第三个参数分别为更新的最短时间minTime和最短距离minDistace
        //LocationManager 每隔 5 秒钟会检测一下位置的变化情况，当移动距离超过 10 米的时候，
        // 就会调用 LocationListener 的 onLocationChanged() 方法，并把新的位置信息作为参数传入。
        //locationManager.requestLocationUpdates(locationProvider, 5000, 10, locationListener);
    }

    //获取经纬度
    private void showLocation() {
        if (location == null) {
            getLocation();
        } else {
            double latitude = location.getLatitude();//纬度
            double longitude = location.getLongitude();//经度
            if (addressCallback != null) {
                addressCallback.onGetLocation(latitude, longitude);
            }
            getAddress(latitude, longitude);
        }
    }

    private void getAddress(double latitude, double longitude) {
        //Geocoder通过经纬度获取具体信息
        Geocoder gc = new Geocoder(mContext, Locale.getDefault());
        try {
            List<Address> locationList = gc.getFromLocation(latitude, longitude, 1);
            if (locationList != null && locationList.size() > 0) {
                if (addressCallback != null) {
                    addressCallback.onGetAddress(locationList.get(0));
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void removeLocationUpdatesListener() {
        if (locationManager != null) {
            uniqueInstance = null;
            locationManager.removeUpdates(locationListener);
        }
    }

    private final LocationListener locationListener = new LocationListener() {
        // Provider的状态在可用、暂时不可用和无服务三个状态直接切换时触发此函数
        @Override
        public void onStatusChanged(String provider, int status, Bundle arg2) {
        }

        // Provider被enable时触发此函数，比如GPS被打开
        @Override
        public void onProviderEnabled(String provider) {
        }

        // Provider被disable时触发此函数，比如GPS被关闭
        @Override
        public void onProviderDisabled(String provider) {
        }

        //当坐标改变时触发此函数，如果Provider传进相同的坐标，它就不会被触发
        @Override
        public void onLocationChanged(Location location) {
            Log.v(TAG, "onLocationChanged>>>" + location.toString());
        }
    };

    //从网络获取经纬度
    private void getLngAndLatWithNetwork() {
        //添加用户权限申请判断
        if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
                && ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            return;
        }
        LocationManager locationManager = (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);
        locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 5000, 10, locationListener);
        location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
        showLocation();
    }

    public interface AddressCallback {
        void onGetAddress(Address address);

        void onGetLocation(double lat, double lng);
    }
}