Android中GPS/Map的运用

publicclassActivity01extendsMapActivity
{
publicMapControllermapController;
publicMyLocationOverlaymyPosition;
publicMapViewmyMapView;
privatestaticfinalintZOOM_IN=Menu.FIRST;
privatestaticfinalintZOOM_OUT=Menu.FIRST+1;

publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//取得LocationManager实例
LocationManagerlocationManager;
Stringcontext=Context.LOCATION_SERVICE;
locationManager=(LocationManager)getSystemService(context);
myMapView=(MapView)findViewById(R.id.MapView01);
//取得MapController实例，控制地图
mapController=myMapView.getController();
//设置显示模式
myMapView.setSatellite(true);
myMapView.setStreetView(true);
//设置缩放控制,这里我们自己实现缩放菜单
myMapView.displayZoomControls(false);
//设置使用MyLocationOverlay来绘图
mapController.setZoom(17);
myPosition=newMyLocationOverlay();
Listoverlays=myMapView.getOverlays();
overlays.add(myPosition);
//设置Criteria（服务商）的信息
Criteriacriteria=newCriteria();
//经度要求
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(false);
criteria.setPowerRequirement(Criteria.POWER_LOW);
//取得效果最好的criteria
Stringprovider=locationManager.getBestProvider(criteria,true);
//得到坐标相关的信息
Locationlocation=locationManager.getLastKnownLocation(provider);
//更新坐标
updateWithNewLocation(location);
//注册一个周期性的更新，3000ms更新一次
//locationListener用来监听定位信息的改变
locationManager.requestLocationUpdates(provider,3000,0,locationListener);
}
privatevoidupdateWithNewLocation(Locationlocation)
{
StringlatLongString;
TextViewmyLocationText=(TextView)findViewById(R.id.TextView01);

StringaddressString="没有找到地址\n";

if(location!=null)
{
//为绘制标志的类设置坐标
myPosition.setLocation(location);
//取得经度和纬度
DoublegeoLat=location.getLatitude()*1E6;
DoublegeoLng=location.getLongitude()*1E6;
//将其转换为int型
GeoPointpoint=newGeoPoint(geoLat.intValue(),geoLng.intValue());
//定位到指定坐标
mapController.animateTo(point);
doublelat=location.getLatitude();
doublelng=location.getLongitude();
latLongString="经度："+lat+"\n纬度："+lng;

doublelatitude=location.getLatitude();
doublelongitude=location.getLongitude();
//更具地理环境来确定编码
Geocodergc=newGeocoder(this,Locale.getDefault());
try
{
//取得地址相关的一些信息\经度、纬度
Listaddresses=gc.getFromLocation(latitude,longitude,1);
StringBuildersb=newStringBuilder();
if(addresses.size()>0)
{
Addressaddress=addresses.get(0);
for(inti=0;isb.append(address.getAddressLine(i)).append("\n");

sb.append(address.getLocality()).append("\n");
sb.append(address.getPostalCode()).append("\n");
sb.append(address.getCountryName());
addressString=sb.toString();
}
}catch(IOExceptione){}
}
else
{
latLongString="没有找到坐标.\n";
}
//显示
myLocationText.setText("你当前的坐标如下:\n"+latLongString+"\n"+addressString);
}
privatefinalLocationListenerlocationListener=newLocationListener()
{
//当坐标改变时触发此函数
publicvoidonLocationChanged(Locationlocation)
{
updateWithNewLocation(location);
}
//Provider被disable时触发此函数，比如GPS被关闭
publicvoidonProviderDisabled(Stringprovider)
{
updateWithNewLocation(null);
}
//Provider被enable时触发此函数，比如GPS被打开
publicvoidonProviderEnabled(Stringprovider){}
//Provider的转态在可用、暂时不可用和无服务三个状态直接切换时触发此函数
publicvoidonStatusChanged(Stringprovider,intstatus,Bundleextras){}
};
protectedbooleanisRouteDisplayed()
{
returnfalse;
}
//为应用程序添加菜单
publicbooleanonCreateOptionsMenu(Menumenu)
{
super.onCreateOptionsMenu(menu);
menu.add(0,ZOOM_IN,Menu.NONE,"放大");
menu.add(0,ZOOM_OUT,Menu.NONE,"缩小");
returntrue;
}
publicbooleanonOptionsItemSelected(MenuItemitem)
{
super.onOptionsItemSelected(item);
switch(item.getItemId())
{
case(ZOOM_IN):
//放大
mapController.zoomIn();
returntrue;
case(ZOOM_OUT):
//缩小
mapController.zoomOut();
returntrue;
}
returntrue;
}

classMyLocationOverlayextendsOverlay
{
LocationmLocation;
//在更新坐标时，设置该坐标，一边画图
publicvoidsetLocation(Locationlocation)
{
mLocation=location;
}
@Override
publicbooleandraw(Canvascanvas,MapViewmapView,booleanshadow,longwhen)
{
super.draw(canvas,mapView,shadow);
Paintpaint=newPaint();
PointmyScreenCoords=newPoint();
//将经纬度转换成实际屏幕坐标
GeoPointtmpGeoPoint=newGeoPoint((int)(mLocation.getLatitude()*1E6),(int)(mLocation.getLongitude()*1E6));
mapView.getProjection().toPixels(tmpGeoPoint,myScreenCoords);
paint.setStrokeWidth(1);
paint.setARGB(255,255,0,0);
paint.setStyle(Paint.Style.STROKE);
Bitmapbmp=BitmapFactory.decodeResource(getResources(),R.drawable.home);
canvas.drawBitmap(bmp,myScreenCoords.x,myScreenCoords.y,paint);
canvas.drawText("HereamI",myScreenCoords.x,myScreenCoords.y,paint);
returntrue;
}
}
}

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