Android获取当前位置Location的两种方式

1.Android自带的api中有获取Location的方法

逻辑如下：
1.先优先取得GPS和NetWork的提供的位置情报
2.如果取不到，先获取PASSIVE的情报(其他应用的获取的Location)，然后监听GPS
3.GPS有返回之后，通过Listener将情报信息再次返回

代码如下：

@EBean(scope = EBean.Scope.Singleton)
public class LocationProvider implements LocationListener {

    public interface LocationGetListener {
        void getLocationInfo(Location location);
    }

    @RootContext
    Context mContext;
    LocationManager mLocationManager;
    LocationGetListener mListener;

    @AfterInject
    void initProvider() {
           mLocationManager = (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);
    }

    @SuppressLint("MissingPermission")
    public void getBestLocation(LocationGetListener listener) {
        mListener = listener;
        Location location;
        Criteria criteria = new Criteria();

        String provider = mLocationManager.getBestProvider(criteria, true);
        if (TextUtils.isEmpty(provider)) {
            location = getNetWorkLocation(mContext);
        } else {
            location = mLocationManager.getLastKnownLocation(provider);
        }
        if (location == null) {
            // 一旦、既存の位置情報を使用する。GPSで取得したあとで、情報を更新する
            provider = LocationManager.PASSIVE_PROVIDER;
            location = mLocationManager.getLastKnownLocation(provider);
            if (mListener != null) {
                mListener.getLocationInfo(location);
            }

            mLocationManager.requestLocationUpdates(provider, 60000, 1, this);
        } else if (mListener != null) {
            mListener.getLocationInfo(location);
        }
    }

    @SuppressLint("MissingPermission")
    public Location getNetWorkLocation(Context context) {
        Location location = null;

        if (mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {

            location = mLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
        }
        return location;
    }

    public void unregisterLocationUpdaterListener() {
        mLocationManager.removeUpdates(this);
    }

    @Override
    public void onLocationChanged(Location location) {
        LogUtils.v("location : onLocationChanged");
        if (mListener != null) {
            mListener.getLocationInfo(location);
        }
        unregisterLocationUpdaterListener();
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        LogUtils.v("location : " + provider + " onStatusChanged. status = " + status);
    }

    @Override
    public void onProviderEnabled(String provider) {
        LogUtils.v("location : " + provider + " onProviderEnabled");
    }

    @Override
    public void onProviderDisabled(String provider) {
        LogUtils.v("location : " + provider + " onProviderDisabled");
    }
}

上面的代码有一个需要注意点：如果是新的设备，没有安装任何获取location的app，那么使用这段代码如果在没有GPS和网络的情况下，使用PASSIVE方式是获取不到地址的，location是 null，这个时候就需要根据项目情况来设置默认地址。

2. 如果使用Google 自带的Api也可以实现获取Location的方式

在gradle中导入依赖com.google.android.gms:play-services-location，java代码如下

public class GoogleMapManager {

    public static final int UPDATE_INTERVAL = 5000;
    public static final int FASTEST_UPDATE_INTNERVAL = 2000;

    private static GoogleMapManager googleMapManager;
    private LocationRequest mLocationRequest;
    private GoogleApiClient mGoogleApiClient;
    private LatLng myLocation;
    private Context mContext;

    private GoogleApiLinkListener mApiLinkListener;

    public interface GoogleApiLinkListener {
        void onConnected(@Nullable Bundle bundle);

        void onConnectionFailed(@NonNull ConnectionResult connectionResult);
    }

//注意这个地方使用aplication的 context，防止内存泄漏
    private GoogleMapManager(Context context) {
        this.mContext = context;
    }

    public GoogleApiClient getGoogleApiClient() {
        return mGoogleApiClient;
    }

    public static GoogleMapManager getGoogleApiManager(Context context) {
        if (googleMapManager == null) {
            googleMapManager = new GoogleMapManager(context);
        }
        return googleMapManager;
    }

    public GoogleMapManager initGoogleApiClient(GoogleApiLinkListener apiLinkListener) {
        this.mApiLinkListener = apiLinkListener;
        if (mGoogleApiClient == null) {
            mGoogleApiClient = new GoogleApiClient.Builder(mContext)
                    .addConnectionCallbacks(new GoogleApiClient.ConnectionCallbacks() {
                        @Override
                        public void onConnected(@Nullable Bundle bundle) {
                            if (mApiLinkListener == null) {
                                return;
                            }
                            mApiLinkListener.onConnected(bundle);
                        }

                        @Override
                        public void onConnectionSuspended(int i) {

                        }
                    })
                    .addOnConnectionFailedListener(connectionResult -> {
                        if (mApiLinkListener == null) {
                            return;
                        }
                        mApiLinkListener.onConnectionFailed(connectionResult);
                    })
                    .addApi(LocationServices.API)
                    .build();
        }

        return googleMapManager;
    }

    public GoogleMapManager initGoogleLocationRequest() {
        if (mLocationRequest == null) {
            mLocationRequest = LocationRequest.create()
                    .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
                    .setInterval(UPDATE_INTERVAL)
                    .setFastestInterval(FASTEST_UPDATE_INTNERVAL);
        }

        return googleMapManager;
    }

// 该方法为获取location
    public LatLng getMyLocation() {
        if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
                && ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            // TODO: Consider calling
            //    ActivityCompat#requestPermissions
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for ActivityCompat#requestPermissions for more details.
            return null;
        } else {
// 这个地方不能直接获取location
// Task task = mFusedLocationProviderClient.getLastLocation();
// location = (Location) task.getResult();
// 参考链接：https://teamtreehouse.com/community/i-wanted-to-make-the-weather-app-detect-your-location
            LocationServices.getFusedLocationProviderClient(mContext)
                    .getLastLocation()
                    .addOnSuccessListener(location -> {
                        if (location != null) {
                            myLocation = new LatLng(location.getLatitude(), location.getLongitude());
                        }
                    });
        }

        return myLocation;
    }

    public void resetGoogleApiLinkListener() {
        mApiLinkListener = null;
    }

}