android取得所在位置的经纬度

android提供了LocationManager来取得位置,用LocationListener来监听位置的变化

先做一些初始化工作:

/** latitude and longitude of current location*/public static String mLat = "";public static String mLon = "";/** time out for GPS location update */private  Timer mGpsTimer = new Timer();/** TimerTask for time out of GPS location update */private  GpsTimeOutTask mGpsTimeOutTask = new GpsTimeOutTask();/** GPS location update time out in milliseconds*/private  long mGpsTimeOut = 180000;//3 minutes<span style="white-space:pre"></span>public void initiLocationUtil (Context context, LocationObsever locationobsever){mLocationObsever = locationobsever;mContext = context;mLocationManager = (LocationManager)mContext.getSystemService(Context.LOCATION_SERVICE);mLocationListener = new MyLocationListener();}

<span style="white-space:pre"></span>public void RefreshGPS(boolean calledByCreate){mLocationManager.removeUpdates(mLocationListener);boolean providerEnable = true;boolean showLocationServiceDisableNotice = true;//看是否有GPS权限if(mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)){//開始进行定位 mLocationListener为位置监听器mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, mLocationListener);showLocationServiceDisableNotice = false;//start time out timer mGpsTimer = new Timer(); mGpsTimeOutTask = new GpsTimeOutTask();mGpsTimer.schedule(mGpsTimeOutTask, mGpsTimeOut);}if(mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)){mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, mLocationListener);showLocationServiceDisableNotice = false;providerEnable = true;}if(providerEnable){if(mLocationObsever != null){mLocationObsever.notifyChange(REFRESHGPS_COMPLETED, null);}}else{if(mLocationObsever != null){mLocationObsever.notifyChange(REFRESHGPS_NOPROVIDER, null);}}if(showLocationServiceDisableNotice){showLocationServiceDisabledDialog();}}

监听器:

private  class MyLocationListener implements LocationListener{private boolean mLocationReceived = false;@Overridepublic void onLocationChanged(Location location) {if(location != null && !mLocationReceived){mLocationReceived = true;String lon = String.valueOf(location.getLongitude());String lat = String.valueOf(location.getLatitude());if(mLocationObsever != null){mLocationObsever.notifyChange(DEFAULT_LOCATION_COMPLETED, lat+","+lon);}}else  if(location == null){if(mLocationObsever != null){mLocationObsever.notifyChange(GETLOCATION_FAILED, null);}}}@Overridepublic void onProviderDisabled(String provider) {}@Overridepublic void onProviderEnabled(String provider) {}@Overridepublic void onStatusChanged(String provider, int status,Bundle extras) {// TODO Auto-generated method stub//if GPS provider is not accessible, try network providerif(provider.equals(LocationManager.GPS_PROVIDER) && status != LocationProvider.AVAILABLE){if(mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)){mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, mLocationListener);}else{mLocationManager.removeUpdates(mLocationListener);if(mLocationObsever != null){mLocationObsever.notifyChange(STATUS_CHANGED, null);}}}}}

这里用了一个Timer，3分钟后又一次去取一次位置:

private Handler mGpsTimerHandler = new Handler() {public void handleMessage(Message msg) {if (mLocationManager == null) {return;}if (mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {System.out.println("=====use network to get location");mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0,mLocationListener);} else {mLocationManager.removeUpdates(mLocationListener);// mLocationObsever.notifyChange(SETADDLOCATIONBUTTONSTATE_1_SETLOCATIONDES_1,null);if (mLocationObsever != null) {mLocationObsever.notifyChange(GPSTIMEOUT, null);}}}};

界面退出的时候要关掉GPS

/** * cancel operations of refreshing GPS     */public  void cancelRefreshGPS(){if(mLocationManager != null){mLocationManager.removeUpdates(mLocationListener);}if(mLocationObsever != null){mLocationObsever.notifyChange(CANCELGPS_COMPLETED, null);}}public  void destroy (){if(mLocationManager != null){     mLocationManager.removeUpdates(mLocationListener);}if(mGpsTimer != null){mGpsTimer.cancel();} cancelRefreshGPS();mContext = null;mLocationObsever = null;mLocationBuildingList = null;System.gc();}

截图是

android取得所在位置的经纬度_第1张图片

点击MAP的时候,假设採用google map,必须使用sdk带有google api,然后在application中增加<uses-library android:name="com.google.android.maps" />

然后xml是:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:background="#FFFFFF"    android:gravity="center_horizontal"    android:orientation="vertical" >    <include layout="@layout/title_list" />    <View        android:id="@+id/line"        android:layout_width="fill_parent"        android:layout_height="2dip"        android:layout_below="@id/title"        android:background="@drawable/rc_list_divider" />    <com.google.android.maps.MapView        android:id="@+id/mapview"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:apiKey="06nx-Rzpy8WU16_gjO8ZbtRYYY-junnxNArrxFg" /></LinearLayout>

代码是:

@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.around_map);mTextView = (TextView)findViewById(R.id.title_text);mTextView.setText("地图");Intent intent = getIntent();mLatitude = intent.getDoubleExtra("lat", 0.0);mLongitude = intent.getDoubleExtra("lon", 0.0);mMapView = (MapView) findViewById(R.id.mapview);      mMapView.setClickable(true);      mMapView.setBuiltInZoomControls(true);mMapView.setSatellite(true);    mapController = mMapView.getController();//    geoPoint = new GeoPoint((int)(mLatitude * 1E6), (int)(mLongitude * 1E6));      geoPoint=new GeoPoint((int)(30.659259*1000000),(int)(104.065762*1000000));    mMapView.displayZoomControls(true);     //    //  设置地图的初始大小。范围在1和21之间。1：最小尺寸，21：最大尺寸    mapController.setZoom(16);//    ////  创建MyOverlay对象，用于在地图上绘制图形      MyOverlay myOverlay = new MyOverlay();      mMapView.getOverlays().add(myOverlay);             mapController.animateTo(geoPoint);  }@Overrideprotected boolean isRouteDisplayed() {return false;}class MyOverlay extends Overlay  {      @Override      public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when)      {          Paint paint = new Paint();                  //屏幕上文字字体颜色        paint.setColor(Color.RED);          Point screenPoint = new Point();                    mapView.getProjection().toPixels(geoPoint, screenPoint);          Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.location);          //  在地图上绘制图像          canvas.drawBitmap(bmp, screenPoint.x, screenPoint.y, paint);          //  在地图上绘制文字  //        canvas.drawText("移动巴士", 10, 100, paint);          return super.draw(canvas, mapView, shadow, when);      }  }

代码能够在http://download.csdn.net/detail/baidu_nod/7622677下载

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