Android利用谷歌地图获取并解析经纬度对应的地理位置

    最近需要对GPS定位信息进行地理位置解析，看到一些文章里面建议使用百度地图API来做，不过考虑到百度地图在国外的使用体验，还是想试试通过Google地图来进行地理位置获取，闲话不多说，上代码。

首先当然需要检查GPS功能模块以及GPS开启状态，同时在使用GPS时需要考虑到GPS权限请求：

/**
 * check if it has any gps provider
 * @return boolean
 */
public boolean isHasGPSModule(){
    // TODO Auto-generated method stub
    LocationManager lmManager = (LocationManager) getSystemService(LOCATION_SERVICE);
    if (lmManager != null) {
        List mProviders = lmManager.getAllProviders();
        if (mProviders != null && mProviders.contains(LocationManager.GPS_PROVIDER)) {
            return true;
        }
    }
    return false;
}

/**
 * Check if GPS opened
 *
 * @return boolean
 */
private boolean checkGPSIsOpen() {
    boolean isOpen;
    LocationManager locationManager = (LocationManager) this.getSystemService(LOCATION_SERVICE);
    isOpen = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
    return isOpen;
}

android:name="android.permission.ACCESS_COARSE_LOCATION" />
android:name="android.permission.ACCESS_FINE_LOCATION" />

确认GPS处于开启使用后，注册位置监听：

if (isHasGPSModule()) {
    lmManager = (LocationManager) getSystemService(LOCATION_SERVICE);
    Criteria criteria = new Criteria();
    criteria.setAccuracy(Criteria.ACCURACY_LOW);
    criteria.setAltitudeRequired(true);
    criteria.setBearingRequired(true);
    criteria.setCostAllowed(true);
    criteria.setPowerRequirement(Criteria.POWER_LOW);

    String provider = lmManager.getBestProvider(criteria, true);
    Log.i("GPS", "bestprovider=" + provider);
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
            != PackageManager.PERMISSION_GRANTED &&
            ActivityCompat.checkSelfPermission(this, 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;
    }
    Location location = lmManager.getLastKnownLocation(provider);
    if (location != null) {
        updateWithNewLocation(location);
    } else {
        lmManager.requestLocationUpdates(provider, 5000L, 20f, locationListener);
        showProgressDialog("search location ...");
    }
}

等待位置更新onLocationChanged：

LocationListener locationListener = new LocationListener() {
    @Override
    public void onLocationChanged(Location location) {
        // TODO Auto-generated method stub
        Log.i("GPS", "Locationchanged");
        dismissProgressDialog();
        lmManager.removeUpdates(locationListener);
        updateWithNewLocation(location);
    }

    @Override
    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderEnabled(String provider) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub

    }
};

接下来，重点来了，使用得到的location信息去请求位置：

private void updateWithNewLocation(Location location) {
    Log.i("GPS", "updateLocation");
    String latitude = String.valueOf(location.getLatitude());
    String longitude = String.valueOf(location.getLongitude());
    Log.i("GPS", "updateLocation" + "latitude=" + latitude + "longitude=" + longitude);
    
    String url = String.format(
            "http://maps.google.cn/maps/api/geocode/json?latlng=%s,%s&sensor=false&language=en_us",
            latitude, longitude); //请求的链接是重点，尝试了很多次，默认语言中文，这里由于需要设置成美国英语
    sendLocationAdressRequest(url);
}

进行网络请求并得到位置信息：

private void sendLocationAdressRequest(String address) {
    HttpUtil.sendOkHttpRequest(address, new okhttp3.Callback() {
        @Override
        public void onResponse(Call call, Response response) throws IOException {
            if (response != null && !isResponse) {
                isResponse = true;
                String responseData = response.body().string();
                // get address
                

showResponse(responseData);

Log. i( "GPS" , "responseData=" + responseData) ; } } @Override public void onFailure(Call call , IOException e) { Log. i( "GPS" , "request address form Google map failure") ; } }) ;}

private String showResponse(String response) {
    JSONObject jsonObj = null;
    String result = "";
    try {
        // 把服务器相应的字符串转换为JSONObject
        jsonObj = new JSONObject(response);
        // 解析出响应结果中的地址数据
        JSONArray jsonArray = jsonObj.getJSONArray("results");
        Log.i("GPS", "lenth = " + jsonArray.length());
        result = jsonArray.getJSONObject(jsonArray.length() - 1).getString("formatted_address");
        /*result =  jsonObj.getJSONArray(0).getString("formatted_address");*/
        // 此处jsonArray.length()-1得到的位置信息是最后一列，得到的是Google地图划分区域的最外层，
        // 如国家或者特殊城市-香港等，若需要得到具体位置使用0；
        Log.i("GPS", "address json result = " + result);
    } catch (JSONException e) {
        e.printStackTrace();
        Log.i("GPS", "address json result error");
    }
    return result;
}

在这里主要感谢这两篇文章：http://blog.csdn.net/fulianwu/article/details/6540890 和 http://blog.sina.com.cn/s/blog_4b20ae2e0101b2eo.html

以及郭临大神的《Android第一行代码》中对于okhttp3的工具类的使用：

public class HttpUtil {
    public static void sendOkHttpRequest(String url, okhttp3.Callback callback){
        OkHttpClient client = new OkHttpClient();
        Request request = new Request.Builder()
                .url(ur)
                .build();
        client.newCall(request).enqueue(callback);
    }
}

写到这里简单的定位和地址解析已经完成，可以使用得到的地理位置进行相关的开发。

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