转载：android获取当前位置的三种方式

1.GPS定位

2.基站定位

   此类位置的获取有赖于手机无线通讯信号，当手机处在信号覆盖范围内，手机可以获得该区域（即通讯术语中的“小区”）的识别号。因为这些识别号是惟一的，因此可以将识别号和地理坐标对应起来，因此根据识别号就可以知道地理位置。但是误差比较大。

   MCC（Mobile Country Code）、MNC（Mobile Network Code）、LAC（Location Aera Code）、CID（Cell Tower ID）是通讯业内的名词。MCC标识国家，MNC标识网络，两者组合起来则唯一标识一家通讯运营商。从维基百科上了解到，一个国家的MCC不唯一，例如中国有460和461，一家运营商也不只一个MNC，例如中国移动有00、02、07。LAC标识区域，类似于行政区域，运营商将大区域划分成若干小区域，每个区域分配一个LAC。CID标识基站，若手机处在工作状态，则必须要和一个通讯基站进行通讯，通过CID就可以确定手机所在的地理范围。

   在Android当中，大部分和通讯网络相关的信息都需要经过一项系统服务，即TelephoneManager来获得。

TelephonyManager mTelMan = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);

String operator = mTelMan.getNetworkOperator();

String mcc = operator.substring(0, 3);

String mnc = operator.substring(3);

GsmCellLocation location = (GsmCellLocation) mTelMan.getCellLocation();

int cid = location.getCid();

int lac = location.getLac();

通过上面的方法，可获得MCC、MNC、CID、LAC，对照Geolocation API Network Protocol，剩下不多的参数也可以获得，发起请求后根据响应内容即可得到地理位置信息。

请求（Request）的信息如下：

{"cell_towers":[{"mobile_network_code":"00","location_area_code":9733,

"mobile_country_code":"460","cell_id":17267},{"mobile_network_code":"00","location_area_code":9733,

"mobile_country_code":"460","cell_id":27852},{"mobile_network_code":"00","location_area_code":9733,

"mobile_country_code":"460","cell_id":27215},{"mobile_network_code":"00","location_area_code":9733,

"mobile_country_code":"460","cell_id":27198},{"mobile_network_code":"00","location_area_code":9484,

"mobile_country_code":"460","cell_id":27869},{"mobile_network_code":"00","location_area_code":9508,

"mobile_country_code":"460","cell_id":37297},{"mobile_network_code":"00","location_area_code":9733,

"mobile_country_code":"460","cell_id":27888}],

"host":"maps.google.com",

"version":"1.1.0"}

响应（Response）的信息如下：

{"location":{"latitude":23.12488,"longitude":113.271907,"accuracy":630.0},"access_token":"2:61tEAW-rONCT1_W-:JVpp2_jq5a0L-5JK"}

 

3.WIFI定位

  其原理是首先收集每个WIFI无线接入点的位置，对每个无线路由器进行唯一的标识，在数据库中注明这些接入点的具体位置。 使用时，一旦发现有WI-FI接入点，则进入到数据中查看匹配的记录，进而得到位置信息。

  WIFI定位主要取决于节点（node）的物理地址（mac address）。与提供TelephoneManager一样，Android也提供了获取WIFI信息的接口：WifiManager。

WifiManager wifiMan = (WifiManager) getSystemService(Context.WIFI_SERVICE);

WifiInfo info = wifiMan.getConnectionInfo();

String mac = info.getMacAddress();

String ssid = info.getSSID();

通过上面的方法，即可获得必要的请求参数。

发出的请求（Request）信息如下：

{"wifi_towers":[{"mac_address":"00:23:76:AC:41:5D","ssid":"Aspire-NETGEAR"}],"host":"maps.google.com","version":"1.1.0"}

响应（Response）的信息如下：

{"location":{"latitude":23.129075,"longitude":113.264423,"accuracy":140000.0},"access_token":"2:WRr36ynOz_d9mbw5:pRErDAmJXI8l76MU"}

 

---------以上简单介绍了android中获取位置的三种定位方式。实际开发中可利用android.location中的LocationManager类，该类封装了地理位置信息的接口，提供了GPS_PROVIDER和 NETWORK_PROVIDER。

如果开发的应用需要高精确性，那么可使用GPS_PROVIDER，但这也意味着应用无法在室内使用，待机时间缩短，响应时间稍长等问题；

如果开发的应用需要快速反应，对精度要求不怎么高，并且要尽可能节省电量，那么使用NETWORK_PROVIDER是不错的选择。

这里提一下，还有一个 PASSIVE_PROVIDER，在实际应用中较少使用。

1.如下代码就是设置从Network中获取位置：

LocationManager mLocMan = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

mLocMan.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,0,0, mLocLis);

需要对应的权限：android.permission.ACCESS_COARSE_LOCATION

2.如下代码就是设置从GPS获取位置：

LocationManager mLocMan = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

mLocMan.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0, mLocLis);

需要对应的权限：android.permission.ACCESS_FINE_LOCATION

如果代码里使用了两个 PROVIDER，则只需要一个权限即可：android.permission.ACCESS_FINE_LOCATION。

以下是整个过程的代码：

public class DemoActivity extends Activity {

 

    private static final String TAG = "DemoActivity";

 

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

    }

 

    public void onRequestLocation(View view) {

        switch (view.getId()){

        case R.id.gpsBtn:

            Log.d(TAG, "GPS button is clicked");

            requestGPSLocation();

            break;

        case R.id.telBtn:

            Log.d(TAG, "CellID button is clicked");

            requestTelLocation();

            break;

        case R.id.wifiBtn:

            Log.d(TAG, "WI-FI button is clicked");

            requestWIFILocation();

            break;

        case R.id.netBtn:

            Log.d(TAG, "Network button is clicked");

            requestNetworkLocation();

            break;

        }

    }

 

    private void requestTelLocation() {

        TelephonyManager mTelMan = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);

        // MCC+MNC. Unreliable on CDMA networks

        String operator = mTelMan.getNetworkOperator();

        String mcc = operator.substring(0, 3);

        String mnc = operator.substring(3);

 

        GsmCellLocation location = (GsmCellLocation) mTelMan.getCellLocation();

        int cid = location.getCid();

        int lac = location.getLac();

 

        JSONObject tower = new JSONObject();

        try {

            tower.put("cell_id", cid);

            tower.put("location_area_code", lac);

            tower.put("mobile_country_code", mcc);

            tower.put("mobile_network_code", mnc);

        } catch (JSONException e) {

            Log.e(TAG, "call JSONObject's put failed", e);

        }

 

        JSONArray array = new JSONArray();

        array.put(tower);

 

        List<NeighboringCellInfo> list = mTelMan.getNeighboringCellInfo();

        Iterator<NeighboringCellInfo> iter = list.iterator();

        NeighboringCellInfo cellInfo;

        JSONObject tempTower;

        while (iter.hasNext()) {

            cellInfo = iter.next();

            tempTower = new JSONObject();

            try {

                tempTower.put("cell_id", cellInfo.getCid());

                tempTower.put("location_area_code", cellInfo.getLac());

                tempTower.put("mobile_country_code", mcc);

                tempTower.put("mobile_network_code", mnc);

            } catch (JSONException e) {

                Log.e(TAG, "call JSONObject's put failed", e);

            }

            array.put(tempTower);

        }

 

        JSONObject object = createJSONObject("cell_towers", array);

        requestLocation(object);

    }

 

    private void requestWIFILocation() {

        WifiManager wifiMan = (WifiManager) getSystemService(Context.WIFI_SERVICE);

        WifiInfo info = wifiMan.getConnectionInfo();

        String mac = info.getMacAddress();

        String ssid = info.getSSID();

 

        JSONObject wifi = new JSONObject();

        try {

            wifi.put("mac_address", mac);

            wifi.put("ssid", ssid);

        } catch (JSONException e) {

            e.printStackTrace();

        }

 

        JSONArray array = new JSONArray();

        array.put(wifi);

 

        JSONObject object = createJSONObject("wifi_towers", array);

        requestLocation(object);

    }

 

    private void requestLocation(JSONObject object) {

        Log.d(TAG, "requestLocation: " + object.toString());

        HttpClient client = new DefaultHttpClient();

        HttpPost post = new HttpPost("http://www.google.com/loc/json");

        try {

            StringEntity entity = new StringEntity(object.toString());

            post.setEntity(entity);

        } catch (UnsupportedEncodingException e) {

            e.printStackTrace();

        }

 

        try {

            HttpResponse resp = client.execute(post);

            HttpEntity entity = resp.getEntity();

            BufferedReader br = new BufferedReader(new InputStreamReader(entity.getContent()));

            StringBuffer buffer = new StringBuffer();

            String result = br.readLine();

            while (result != null) {

                buffer.append(result);

                result = br.readLine();

            }

 

            Log.d(TAG, buffer.toString());

        } catch (ClientProtocolException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

 

    private JSONObject createJSONObject(String arrayName, JSONArray array) {

        JSONObject object = new JSONObject();

        try {

            object.put("version", "1.1.0");

            object.put("host", "maps.google.com");

            object.put(arrayName, array);

        } catch (JSONException e) {

            Log.e(TAG, "call JSONObject's put failed", e);

        }

        return object;

    }

 

    private void requestGPSLocation() {

        LocationManager mLocMan = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        mLocMan.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000 * 60, 100, mLocLis);

    }

 

    private void requestNetworkLocation() {

        LocationManager mLocMan = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        mLocMan.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1000 * 60, 100, mLocLis);

    }

 

    private LocationListener mLocLis = new LocationListener() {

 

        @Override

        public void onStatusChanged(String provider, int status, Bundle extras) {

            Log.d(TAG, "onStatusChanged, provider = " + provider);

        }

 

        @Override

        public void onProviderEnabled(String provider) {

            Log.d(TAG, "onProviderEnabled, provider = " + provider);

        }

 

        @Override

        public void onProviderDisabled(String provider) {

            Log.d(TAG, "onProviderDisabled, provider = " + provider);

        }

 

        @Override

        public void onLocationChanged(Location location) {

            double latitude = location.getLatitude();

            double longitude = location.getLongitude();

            Log.d(TAG, "latitude: " + latitude + ", longitude: " + longitude);

        }

    };

}