在谷歌地图android中使用gps移动标记
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【中文标题】在谷歌地图android中使用gps移动标记【英文标题】：Move marker with gps in google map android 【发布时间】：2017-07-23 10:12:11 【问题描述】：我想移动GOOGLE MAP 中的标记，同时gps 位置发生变化，就像在UBER 应用程序中一样。我找到了一些解决方案，但无法解决我的问题。解决方案是1 和2
下面是我的onLocationChange()方法
public void onLocationChanged(Location location)
double lattitude = location.getLatitude();
double longitude = location.getLongitude();
mLastLocation = location;
if (mCurrLocationMarker != null)
mCurrLocationMarker.remove();
//Place current location marker
LatLng latLng = new LatLng(lattitude, longitude);
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("I am here");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
mCurrLocationMarker = mGoogleMap.addMarker(markerOptions);
tv_loc.append("Lattitude: " + lattitude + " Longitude: " + longitude);
//move map camera
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mGoogleMap.animateCamera(CameraUpdateFactory.zoomTo(15));
//stop location updates
if (mGoogleApiClient != null)
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
更新 1（重新编辑）
为了更好地理解，我添加了更多代码，但首先我想告诉我我在我的应用程序中使用标签。第一个tab 是我的地图。所以我正在使用片段。
public class MyLocation extends Fragment implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener,
LocationListener
GoogleMap mGoogleMap;
SupportMapFragment mapFrag;
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
Marker mCurrLocationMarker=null;
TextView tv_loc;
private static View view;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
if(view != null)
ViewGroup viewGroupParent = (ViewGroup)view.getParent();
if(viewGroupParent !=null)
viewGroupParent.removeView(viewGroupParent);
try
view = inflater.inflate(R.layout.my_location,container, false);
catch (Exception e)
/* map is already there, just return view as it is */
return view;
// inflat and return the layout
//View rootView = inflater.inflate(R.layout.my_location, container, false);
tv_loc = (TextView)view.findViewById(R.id.textView);
mapFrag = (SupportMapFragment)getChildFragmentManager().findFragmentById(R.id.map);
mapFrag.getMapAsync(this);
return view;
@Override
public void onPause()
super.onPause();
//stop location updates when Activity is no longer active
if(mGoogleApiClient !=null)
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
@Override
public void onMapReady(GoogleMap googleMap)
mGoogleMap=googleMap;
mGoogleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
//Initialize Google Play Services
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
if (ContextCompat.checkSelfPermission(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED)
//Location Permission already granted
buildGoogleApiClient();
mGoogleMap.setMyLocationEnabled(true);
else
//Request Location Permission
checkLocationPermission();
else
buildGoogleApiClient();
mGoogleMap.setMyLocationEnabled(true);
protected synchronized void buildGoogleApiClient()
mGoogleApiClient = new GoogleApiClient.Builder(getActivity())
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
@Override
public void onConnected(Bundle bundle)
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (ContextCompat.checkSelfPermission(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED)
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
@Override
public void onConnectionSuspended(int i)
@Override
public void onLocationChanged(Location location)
double lattitude = location.getLatitude();
double longitude = location.getLongitude();
//Place current location marker
LatLng latLng = new LatLng(lattitude, longitude);
if(mCurrLocationMarker!=null)
mCurrLocationMarker.setPosition(latLng);
else
mCurrLocationMarker = mGoogleMap.addMarker(new MarkerOptions()
.position(latLng)
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED))
.title("I am here"));
tv_loc.append("Lattitude: " + lattitude + " Longitude: " + longitude);
mGoogleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 15));
//stop location updates
if (mGoogleApiClient != null)
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
/*double lattitude = location.getLatitude();
double longitude = location.getLongitude();
mLastLocation = location;
if (mCurrLocationMarker != null)
//mGoogleMap.clear();
mCurrLocationMarker.remove();
//Place current location marker
LatLng latLng = new LatLng(lattitude, longitude);
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("I am here");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)).draggable(true);
mCurrLocationMarker = mGoogleMap.addMarker(markerOptions);
mCurrLocationMarker.setPosition(new LatLng(lattitude,longitude));
tv_loc.append("Lattitude: " + lattitude + " Longitude: " + longitude);
//move map camera
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mGoogleMap.animateCamera(CameraUpdateFactory.zoomTo(15));
//stop location updates
if (mGoogleApiClient != null)
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
*/
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
private void checkLocationPermission()
if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED)
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION))
// Show an explanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
new AlertDialog.Builder(getActivity())
.setTitle("Location Permission Needed")
.setMessage("This app needs the Location permission, please accept to use location functionality")
.setPositiveButton("OK", new DialogInterface.OnClickListener()
@Override
public void onClick(DialogInterface dialogInterface, int i)
//Prompt the user once explanation has been shown
ActivityCompat.requestPermissions(getActivity(),
new String[]Manifest.permission.ACCESS_FINE_LOCATION,
MY_PERMISSIONS_REQUEST_LOCATION );
)
.create()
.show();
else
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(getActivity(),
new String[]Manifest.permission.ACCESS_FINE_LOCATION,
MY_PERMISSIONS_REQUEST_LOCATION );
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults)
/*super.onRequestPermissionsResult(requestCode, permissions, grantResults);*/
switch (requestCode)
case MY_PERMISSIONS_REQUEST_LOCATION:
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED)
// permission was granted, yay! Do the
// location-related task you need to do.
if(ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED)
if(mGoogleApiClient == null)
buildGoogleApiClient();
mGoogleMap.setMyLocationEnabled(true);
else
// permission denied, boo! Disable the
// functionality that depends on this permission.
//finish();
Toast.makeText(getActivity(), "permission denied", Toast.LENGTH_LONG).show();
return;
// other 'case' lines to check for other
// permissions this app might request
@Override
public void onResume()
super.onResume();
@Override
public void onDestroy()
super.onDestroy();
@Override
public void onLowMemory()
super.onLowMemory();
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult)
任何帮助将不胜感激
【问题讨论】：
试试mGoogleMap.clear()而不是mCurrLocationMarker.remove()
试过了，没用
快速提问，这个方法在哪里？在活动、服务、应用程序中？如果在一个活动中，它会在你回到活动之前工作，还是根本不工作？我们需要查看更多代码才能真正帮助您。主要是这个方法所在的地方。
使用这个***.com/a/42778943/7399521
【参考方案1】：
您可以使用下面的代码来更新标记的位置
public void onLocationChanged(Location location)
double lattitude = location.getLatitude();
double longitude = location.getLongitude();
//Place current location marker
LatLng latLng = new LatLng(lattitude, longitude);
if(mCurrLocationMarker!=null)
mCurrLocationMarker.setPosition(latLng);
else
mCurrLocationMarker = mGoogleMap.addMarker(new MarkerOptions()
.position(latLng)
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED))
.title("I am here");
tv_loc.append("Lattitude: " + lattitude + " Longitude: " + longitude);
gMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 15));
//stop location updates
if (mGoogleApiClient != null)
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
您不需要每次都清除地图。您可以通过将 Marker 添加到 Map 时返回的 Marker 对象来完成。 希望对你有帮助。
【讨论】：
尝试了您的代码，但当蓝点移动时，标记仍然位于同一位置。销钉移动时应设置在蓝点上 你能检查一下你的 onLocationChanged 事件被调用了吗？蓝色引脚也是默认地图，他们可能使用不同的逻辑来更改位置。您可以通过硬编码值来检查 setPostion 方法，并检查位置是否改变。我尝试了同样的方法，它正在改变。stop location updates 这会停止更新位置，所以我认为这就是不移动标记的原因。我的想法可能是我错了
而且每次都会调用onLocationChange方法。你也可以看到我的更新代码
您能否尝试删除停止位置更新下的代码。然后。如果仍然没有，请尽可能上传您的整个活动代码。将清楚地知道为什么它没有被更新【参考方案2】：
首先在你的Activity中实现LocationListener，然后
如果您只需要显示一个标记（更新标记的位置），请使用：
private Marker currentPositionMarker = null;
@Override
public void onLocationChanged(Location location)
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(latLng).zoom(14).build();
// mMap.clear(); // Call if You need To Clear Map
if (currentPositionMarker == null)
currentPositionMarker = mMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_YELLOW))
.position(latLng)
.zIndex(20));
else
currentPositionMarker.setPosition(latLng);
mMap.animateCamera(CameraUpdateFactory
.newCameraPosition(cameraPosition));
或者如果您想每次都添加一个新标记：
@Override
public void onLocationChanged(Location location)
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(latLng).zoom(14).build();
mMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_YELLOW))
.position(latLng)
.zIndex(20));
mMap.animateCamera(CameraUpdateFactory
.newCameraPosition(cameraPosition));
如果位置快速更改，您的应用需要几秒钟来更新其位置标记
【讨论】：
【参考方案3】：这可以使用 CameraPosition、googleMap.animateCamera 和使用线性插值器的标记移动动画来完成。
你可以看看这个教程here和各自的githubpage。
本教程使用谷歌地图 v2。希望这会有所帮助。
【讨论】：
【参考方案4】：使用这个：
在您的地图活动中实现LocationListener ,GoogleMap.OnMyLocationChangeListener，然后使用位置更改监听器
@Override
public void onMyLocationChange(Location location)
//mMap.clear //if you want refresh map remove comment
// Getting latitude of the current location
double latitude = location.getLatitude();
// Getting longitude of the current location
double longitude =location.getLongitude();
// Creating a LatLng object for the current location
LatLng latLng = new LatLng(latitude, longitude); //your_text_view.settext(latitude+","+longtitudde)
// Showing the current location in Google Map
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.addMarker(new MarkerOptions().icon(BitmapDescriptorFactory.fromResource(R.drawable.destination_marker)).position(latLng).title(maping_status));
// Zoom in the Google Map
mMap.animateCamera(CameraUpdateFactory.zoomTo(20));
【讨论】：
试过了，标记确实移动了，每次它移动前一个仍然显示，此外，我使用的文本视图显示当前latitude 和longitude。所以文本视图会继续一个一个地重复，而前一个仍然存在。
您使用像 mMap.clear() 这样的标记清除选项。在从我的位置获取 lat long 之前添加上面的代码。
我希望这会帮助你@faisal1208
并在上面的方法中添加像your_text_view.settext(latitude+","+longtitudde)这样的内部方法在从当前位置获取lat long后添加
我根据你的喜好编辑我的帖子***.com/a/42778943/7399521 删除我提到的命令 希望你能理解@faisal1208【参考方案5】：
为了动画，只需调用此方法 (animateMarker) 与以前的位置和新的位置以及标记对象
private Marker mCurrentMarker;
private float ZOOMLEVEL=18.0f;
private LatLng previousLatLon;
private Handler mLocalHandler;
private GoogleMap mGoogleMap;
public void animateMarker(final Marker marker, final LatLng toPosition,final LatLng fromPosition)
final long duration = 500;
final Interpolator interpolator = new LinearInterpolator();
mLocalHandler.post(new Runnable()
@Override
public void run()
long elapsed = SystemClock.uptimeMillis() - mStartTime;
float t = interpolator.getInterpolation((float) elapsed
/ duration);
marker.setPosition(toPosition);
marker.setAnchor(Constants.MAPANCHOR, Constants.MAPANCHOR);
mGoogleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(toPosition, ZOOMLEVEL));
if (t < 1.0)
// Post again 16ms later.
mLocalHandler.postDelayed(this, 16);
else
marker.setVisible(true);
);
previousLatLon=toPosition;// reassign the previous location to current location
【讨论】：
【参考方案6】：希望这个答案能帮助你。而不是 gps 使用 Google Fused Api Read Documentation Here For Fused Api 并阅读这个答案 how To Make Bus Marker Move
试试这个教程链接以更好地理解Fused Api Example
【讨论】：
【参考方案7】：在清单中添加这些行
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
然后使用这个类
public class MainActivity extends AppCompatActivity implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener
GoogleMap mgoogleMap;
GoogleApiClient mgoogleApi;
Context context;
Marker marker;
LocationRequest locationrequest;
public static final int map=1111;
public static final int coarse=1112;
@Override
protected void onCreate(Bundle savedInstanceState)
if (googleServiceAvalable())
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = getApplicationContext();
checkReadPermission();
checkCoarsePermission();
initMap();
else
public boolean googleServiceAvalable()
GoogleApiAvailability api = GoogleApiAvailability.getInstance();
int isavailable = api.isGooglePlayServicesAvailable(this);
if (isavailable == ConnectionResult.SUCCESS)
return true;
else if (api.isUserResolvableError(isavailable))
Dialog dialog = api.getErrorDialog(this, isavailable, 0);
dialog.show();
else
Toast.makeText(this, "cant connect to play services", Toast.LENGTH_LONG).show();
return false;
private void initMap()
MapFragment mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.fragment);
mapFragment.getMapAsync(this);
@Override
public void onMapReady(GoogleMap googleMap)
mgoogleMap = googleMap;
if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.M)
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.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;
mgoogleMap.setMyLocationEnabled(true);
if(checkCoarsePermission() && checkReadPermission())
mgoogleApi = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
mgoogleApi.connect();
else
checkReadPermission();
checkCoarsePermission();
private void goToLocation(double latitude, double longitude, int i)
LatLng ll = new LatLng(latitude, longitude);
CameraUpdate update = CameraUpdateFactory.newLatLngZoom(ll, i);
mgoogleMap.animateCamera(update);
if(marker !=null)
marker.remove();
MarkerOptions options =new MarkerOptions()
.title("Test")
.draggable(true)
.position(new LatLng(latitude,longitude ));
marker= mgoogleMap.addMarker(options);
@Override
public void onConnected(@Nullable Bundle bundle)
locationrequest = new LocationRequest().create();
locationrequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationrequest.setInterval(1000);
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.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;
LocationServices.FusedLocationApi.requestLocationUpdates(mgoogleApi, locationrequest, this);
Toast.makeText(context,"Location Connected and ready to publish",Toast.LENGTH_SHORT).show();
@Override
public void onConnectionSuspended(int i)
Toast.makeText(context,"Location Connection Suspended",Toast.LENGTH_SHORT);
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult)
Toast.makeText(context,"Location Connection Failed"+connectionResult.getErrorMessage(),Toast.LENGTH_SHORT);
@Override
public void onLocationChanged(Location location)
if(location==null)
Toast.makeText(context,"Cant Find User Location",Toast.LENGTH_SHORT);
else
LatLng ll=new LatLng(location.getLatitude(),location.getLongitude());
goToLocation(ll.latitude,ll.longitude,18);
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public boolean checkReadPermission()
int currentAPIVersion = Build.VERSION.SDK_INT;
if (currentAPIVersion >= android.os.Build.VERSION_CODES.M)
if (ContextCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)
if (ActivityCompat.shouldShowRequestPermissionRationale((Activity) MainActivity.this, android.Manifest.permission.ACCESS_FINE_LOCATION))
AlertDialog.Builder alertBuilder = new AlertDialog.Builder(MainActivity.this);
alertBuilder.setCancelable(true);
alertBuilder.setTitle("Permission necessary");
alertBuilder.setMessage("Read Internal Storage permission required to display images!!!");
alertBuilder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener()
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public void onClick(DialogInterface dialog, int which)
ActivityCompat.requestPermissions((Activity) MainActivity.this, new String[]android.Manifest.permission.ACCESS_FINE_LOCATION, map);
);
AlertDialog alert = alertBuilder.create();
alert.show();
else
ActivityCompat.requestPermissions((Activity) MainActivity.this, new String[]android.Manifest.permission.ACCESS_FINE_LOCATION, map);
return false;
else
return true;
else
return true;
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public boolean checkCoarsePermission()
int currentAPIVersion = Build.VERSION.SDK_INT;
if (currentAPIVersion >= android.os.Build.VERSION_CODES.M)
if (ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
if (ActivityCompat.shouldShowRequestPermissionRationale((Activity) MainActivity.this, android.Manifest.permission.ACCESS_COARSE_LOCATION))
AlertDialog.Builder alertBuilder = new AlertDialog.Builder(MainActivity.this);
alertBuilder.setCancelable(true);
alertBuilder.setTitle("Permission necessary");
alertBuilder.setMessage("Read Internal Storage permission required to display images!!!");
alertBuilder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener()
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public void onClick(DialogInterface dialog, int which)
ActivityCompat.requestPermissions((Activity) MainActivity.this, new String[]android.Manifest.permission.ACCESS_COARSE_LOCATION, coarse);
);
AlertDialog alert = alertBuilder.create();
alert.show();
else
ActivityCompat.requestPermissions((Activity) MainActivity.this, new String[]android.Manifest.permission.ACCESS_COARSE_LOCATION, coarse);
return false;
else
return true;
else
return true;
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions,
int[] grantResults)
switch (requestCode)
case map:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
else
Toast.makeText(context,"You have to give permission",Toast.LENGTH_SHORT).show();
break;
case coarse:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
else
Toast.makeText(context,"You have to give permission",Toast.LENGTH_SHORT).show();
break;
【讨论】：
【参考方案8】：如果您仍在寻找解决方案，希望 https://www.youtube.com/watch?v=WKfZsCKSXVQ 对您有所帮助。我在我的一个应用程序中使用了它，它有助于将标记从一个位置动画化到另一个位置。 源码可以在这里https://gist.github.com/broady/6314689获取。
您可能需要为标记添加旋转以显示标记的确切方向。以下是我用来查找方位的代码块。
private float bearingBetweenLatLngs(LatLng begin, LatLng end)
Location beginL = convertLatLngToLocation(begin);
Location endL = convertLatLngToLocation(end);
return beginL.bearingTo(endL);
【讨论】：
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