@Override public void onCreate(final Bundle icicle) {       super.onCreate(icicle);       this.setContentView(R.layout.activity_mapview);       mBtnDone =(Button) findViewById(R.id.btn_done);       mBtnDone.setOnClickListener(this);       mapView = (MapView) findViewById(R.id.map_view);       mapView.setBuiltInZoomControls(true);       mapController = mapView.getController();       mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);      mDefaultMarker = getResources().getDrawable(R.drawable.map_redpin);      mDefaultMarker.setBounds(0, 0, mDefaultMarker.getIntrinsicWidth(),      mDefaultMarker.getIntrinsicHeight());       mBuoyOverlay = new BuoyItemizedOverlay(mDefaultMarker, this);       initDensityDpi();       mZoomLevel = mapView.getMaxZoomLevel() - 1; // LocationListener 最好在Activity的onCreate（）方法中進行例項化，當GPS獲得Location時，會自       動呼叫onLocationChanged方法.       mLocationListener = new LocationListener() {           @Override           public void onLocationChanged(final Location loc) {           LogHelper.i(TAG, "onLocationChanged. loc: " + loc);           if (loc != null) {                    LogHelper.i(TAG, "onLocationChanged. latitude: "                             + loc.getLatitude() + " , longtitude: ".getLongitude());                    GeoPoint geoPoint = MapUtils.getGeoPoint(loc);                    mapController.animateTo(geoPoint);                    initBuoyOverlayItems(loc);          } else {              Toast( MapViewActivity.this, "Your current location is temporarily unavailable.",                  Toast.LENGTH_SHORT).show();          }       }        // 當系統Setting -> Location & Security -> Use wireless networks取消勾選，Use GPS                   satellites取消勾選時呼叫        public void onProviderDisabled(final String s) {                  LogHelper.i(TAG, "onProviderDisabled. ");        }         // 當系統Setting -> Location & Security -> Use wireless networks勾選，Use GPS satellites勾           選時呼叫         public void onProviderEnabled(final String s) {               LogHelper.i(TAG, "onProviderEnabled. ");         }         public void onStatusChanged(final String s, final int i, final Bundle b) {               LogHelper.i(TAG, "onStatusChanged. ");         }        };      }        @Override        public void onStart() {            super.onStart();             mapController.setZoom(mZoomLevel);             if (!DoSomeGoodUtils.isNetworkAvailable(this)) {                  mBtnDone.setEnabled(false);                  showDialog(DIALOG_NO_NETWORK);            } else {                  // 判斷Use GPS satellites.是否勾選                  boolean isGpsEnabled = MapUtils.isGPSProviderAvaliable(this);                  // 判斷Use wireless networks 是否勾選                  boolean isWIFIEnabled = MapUtils.isWIFIProviderAvaliable(this);                  if (!isGpsEnabled && !isWIFIEnabled) {                        如果都沒有勾選，則彈出對話方塊，提示使用者勾選。                 }                 else {                       Location lastKnownLocation = null;                       // 如果只是Use GPS satellites勾選，即指允許使用GPS定位                        if (isGpsEnabled && !isWIFIEnabled) {                     lastKnownLocation=mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);                       mProviderName = LocationManager.GPS_PROVIDER;                       // 如果只是Use wireless networks勾選，即只允許使用網路定位。                      } else if(!isGpsEnabled && isWIFIEnabled){                        lastKnownLocation =    mLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);                        mProviderName = LocationManager.NETWORK_PROVIDER;                        // 如果二者都勾選，優先使用GPS,因為GPS定位更精確。                     } else if (isGpsEnabled && isWIFIEnabled) {             lastKnownLocation=mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);                    mProviderName = LocationManager.GPS_PROVIDER;                    if (lastKnownLocation == null) {             lastKnownLocation =mLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);                mProviderName = LocationManager.NETWORK_PROVIDER;                    }         }           if (!TextUtils.isEmpty(mProviderName)) {                 mLocationManager.requestLocationUpdates(                      mProviderName, 1000, 1, mLocationListener);             }           // 如果一下子就能定位成功，則執行以下程式碼，當用網路定位時，大都能一次性定位成功，當用GPS時，該程式碼不會起太大作用。          if (lastKnownLocation ！= null) {                mBtnDone.setEnabled(true);               // 獲取當前地理位置              GeoPoint lastKnownPoint = getLastKnownPoint(lastKnownLocation);               // 以動畫方式移動到該地理位置               mapController.animateTo(lastKnownPoint);               // 更新浮標。該方法在這裡就不公開了。知道它的含義就行                initBuoyOverlayItems(lastKnownLocation);          }        }       }      }      @Override       protected void onResume() {             super.onResume();             LogHelper.i(TAG, "onResume. Provider Name: " + mProviderName);           if (!TextUtils.isEmpty(mProviderName)) {            // 當GPS定位時，在這裡註冊requestLocationUpdates監聽就非常重要而且必要。 沒有這句話，定位不能成功。              mLocationManager.requestLocationUpdates(mProviderName, 1000, 1,                    mLocationListener);            }          }          @Override          protected void onPause() {            super.onPause();            // 取消註冊監聽            if (mLocationManager != null) {                mLocationManager.removeUpdates(mLocationListener);            }       } } 對於定位方式：有些同行，更傾向於使用getBestProvider方法，但是我認為這種方式有他的弊端，不是所有的手機都支援 “使用getBestProvider獲取最適合的Location” ，最好就是使用網路定位和GPS定位.... 注： MapUtils是我自己寫的一個工具類