Android中獲取用戶的地理信息的方式有很多種，各有各得優點和缺點。
這裏主要介紹的方法是通過調用百度提供的地圖API獲取用戶的地理位置信息。
首要不可缺少的還是百度提供的標準Application類
public class BMapApiApplication extends Application {
public static BMapApiApplication mDemoApp;
public static float mDensity;
//百度MapAPI的管理類
public BMapManager mBMapMan = null;
// 授權Key
// TODO: 請輸入您的Key,
// 申請地址：http://dev.baidu.com/wiki/static/imap/key/
public String mStrKey = "F9FBF9FAA9BA37C0C6085BD280723A659EC51B20";
public boolean m_bKeyRight = true; // 授權Key正確，驗證通過
// 常用事件監聽，用來處理通常的網絡錯誤，授權驗證錯誤等
public static class MyGeneralListener implements MKGeneralListener {
@Override
public void onGetNetworkState(int iError) {
Toast.makeText(BMapApiApplication.mDemoApp.getApplicationContext(), "您的網絡出錯啦！",
Toast.LENGTH_LONG).show();
}
@Override
public void onGetPermissionState(int iError) {
if (iError == MKEvent.ERROR_PERMISSION_DENIED) {
// 授權Key錯誤：
Toast.makeText(BMapApiApplication.mDemoApp.getApplicationContext(),
"請在BMapApiDemoApp.java文件輸入正確的授權Key！",
Toast.LENGTH_LONG).show();
BMapApiApplication.mDemoApp.m_bKeyRight = false;
}
}
}
@Override
public void onCreate() {
mDemoApp = this;
mBMapMan = new BMapManager(this);
mBMapMan.init(this.mStrKey, new MyGeneralListener());
mDensity = getResources().getDisplayMetrics().density;
super.onCreate();
}
@Override
//建議在您app的退出之前調用mapadpi的destroy()函數，避免重複初始化帶來的時間消耗
public void onTerminate() {
// TODO Auto-generated method stub
if (mBMapMan != null) {
mBMapMan.destroy();
mBMapMan = null;
}
super.onTerminate();
}
}/** Called when the activity is first created. */
/** 上下文 */
private BMapApiApplication mApplication;
/** 定義搜索服務類 */
private MKSearch mMKSearch;
/** 記錄當前經緯度的MAP*/
private HashMap<String, Double> mCurLocation = new HashMap<String, Double>();
//城市名
private String cityName;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mApplication = (BMapApiApplication) this.getApplication();
if (mApplication.mBMapMan == null) {
mApplication.mBMapMan = new BMapManager(getApplication());
mApplication.mBMapMan.init(mApplication.mStrKey,
new BMapApiApplication.MyGeneralListener());
}
/** 初始化MKSearch */
mMKSearch = new MKSearch();
mMKSearch.init(mApplication.mBMapMan, new MySearchListener());
}
@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
this.registerLocationListener();
}
private void registerLocationListener() {
mApplication.mBMapMan.getLocationManager().requestLocationUpdates(
mLocationListener);
if (mApplication.mBMapMan != null) {
/** 開啓百度地圖API */
mApplication.mBMapMan.start();
}
}
@Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
this.unRegisterLocationListener();
}
private void unRegisterLocationListener() {
mApplication.mBMapMan.getLocationManager().removeUpdates(
mLocationListener);
if (mApplication.mBMapMan != null) {
/** 終止百度地圖API */
mApplication.mBMapMan.stop();
}
}
@Override
protected void onDestroy() {
if (mApplication.mBMapMan != null) {
/** 程序退出前需調用此方法 */
mApplication.mBMapMan.destroy();
mApplication.mBMapMan = null;
}
super.onDestroy();
}
/** 註冊定位事件 */
private LocationListener mLocationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
if (location != null) {
try {
int longitude = (int) (1000000 * location.getLongitude());
int latitude = (int) (1000000 * location.getLatitude());
/** 保存當前經緯度 */
mCurLocation.put("longitude", location.getLongitude());
mCurLocation.put("latitude", location.getLatitude());
GeoPoint point = new GeoPoint(latitude, longitude);
/** 查詢該經緯度值所對應的地址位置信息 */
Weather_WelcomeActivity.this.mMKSearch
.reverseGeocode(new GeoPoint(latitude, longitude));
} catch (Exception e) {
e.printStackTrace();
}
}
}
};
/** 內部類實現MKSearchListener接口,用於實現異步搜索服務 */
private class MySearchListener implements MKSearchListener {
@Override
public void onGetAddrResult(MKAddrInfo result, int iError) {
if( iError != 0 || result == null){
Toast.makeText(Weather_WelcomeActivity.this, "獲取地理信息失敗", Toast.LENGTH_LONG).show();
}else {
Log.info("json", "result= " + result);
cityName =result.addressComponents.city;
Bundle bundle = new Bundle();
bundle.putString("cityName", cityName.substring(0, cityName.lastIndexOf("市")));
Intent intent = new Intent(Weather_WelcomeActivity.this,Weather_MainActivity.class);
intent.putExtras(bundle);
startActivity(intent);
Weather_WelcomeActivity.this.finish();
}
}
@Override
public void onGetDrivingRouteResult(MKDrivingRouteResult result,
int iError) {
}
@Override
public void onGetPoiResult(MKPoiResult result, int type, int iError) {
}
@Override
public void onGetTransitRouteResult(MKTransitRouteResult result,
int iError) {
}
@Override
public void onGetWalkingRouteResult(MKWalkingRouteResult result,
int iError) {
}
}其他方式獲取當前的城市名：
/**
* 抓取當前的城市信息
*
* @return String 城市名
*/
public String getCurrentCityName(){
String city = "";
TelephonyManager telManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
GsmCellLocation glc = (GsmCellLocation) telManager.getCellLocation();
if (glc != null){
int cid = glc.getCid(); // value 基站ID號
int lac = glc.getLac();// 寫入區域代碼
String strOperator = telManager.getNetworkOperator();
int mcc = Integer.valueOf(strOperator.substring(0, 3));// 寫入當前城市代碼
int mnc = Integer.valueOf(strOperator.substring(3, 5));// 寫入網絡代碼
String getNumber = "";
getNumber += ("cid:" + cid + "\n");
getNumber += ("cid:" + lac + "\n");
getNumber += ("cid:" + mcc + "\n");
getNumber += ("cid:" + mnc + "\n");
DefaultHttpClient client = new DefaultHttpClient();
BasicHttpParams params = new BasicHttpParams();
HttpConnectionParams.setSoTimeout(params, 20000);
HttpPost post = new HttpPost("http://www.google.com/loc/json");
try{
JSONObject jObject = new JSONObject();
jObject.put("version", "1.1.0");
jObject.put("host", "maps.google.com");
jObject.put("request_address", true);
if (mcc == 460)
jObject.put("address_language", "zh_CN");
else
jObject.put("address_language", "en_US");
JSONArray jArray = new JSONArray();
JSONObject jData = new JSONObject();
jData.put("cell_id", cid);
jData.put("location_area_code", lac);
jData.put("mobile_country_code", mcc);
jData.put("mobile_network_code", mnc);
jArray.put(jData);
jObject.put("cell_towers", jArray);
StringEntity se = new StringEntity(jObject.toString());
post.setEntity(se);
HttpResponse resp = client.execute(post);
BufferedReader br = null;
if (resp.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
br = new BufferedReader(new InputStreamReader(resp
.getEntity().getContent()));
StringBuffer sb = new StringBuffer();
String result = br.readLine();
while (result != null){
sb.append(getNumber);
sb.append(result);
result = br.readLine();
}
String s = sb.toString();
s = s.substring(s.indexOf("{"));
JSONObject jo = new JSONObject(s);
JSONObject arr = jo.getJSONObject("location");
JSONObject address = arr.getJSONObject("address");
city = address.getString("city");
}
}
catch (JSONException e){
e.printStackTrace();
}
catch (UnsupportedEncodingException e){
e.printStackTrace();
}
catch (ClientProtocolException e){
e.printStackTrace();
}
catch (IOException e){
e.printStackTrace();
}
finally{
post.abort();
client = null;
}
}
return city;
}