我写了一个课程，当我按下按钮时获取我当前的位置，并从其他课程获得其他积分来绘制路线。如果我没有通过我当前的位置地址，它应该获取我当前的位置，并从当前位置绘制路线。 我无法找到获取当前位置LatLng的方法。我怎么能得到它？ 这是我的班级： 顺便说一下，我是android编程的新手，所以代码不是很好YET：）
public class MyLocationDemoActivity extends FragmentActivity implements
ConnectionCallbacks, OnConnectionFailedListener, LocationListener,
OnMyLocationButtonClickListener {
GMapV2Direction md;
private GoogleMap mMap;
GeoPoint gp;
private LocationClient mLocationClient;
private TextView mMessageView;
Bundle extras;
Location mycurrent;
// These settings are the same as the settings for the map. They will in
// fact give you updates
// at the maximal rates currently possible.
private static final LocationRequest REQUEST = LocationRequest.create()
.setInterval(5000) // 5 seconds
.setFastestInterval(16) // 16ms = 60fps
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.my_location_demo);
Intent intent = getIntent();
RouteActivity route = new RouteActivity();
// if (route.myAddress.isEmpty()) {
// System.out.println(" 60 line ");
// } else {
// mMap = ((SupportMapFragment) getSupportFragmentManager()
// .findFragmentById(R.id.map)).getMap();
extras = getIntent().getExtras();
LatLng a = null;
try {
a = (LatLng) extras.get("coord");
} catch (Exception x) {
}
if (a == null) {
try {
System.out.println();
/*//if (mLocationClient != null && mLocationClient.isConnected()) {
LocationManager locManager;
locManager =(LocationManager)getSystemService(Context.LOCATION_SERVICE);
//idetas
locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000L,
500.0f, locationListener);
Location location = locManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
double latitude = location.getLatitude();
double longitude = location.getLongitude();
}
*/
//}
LatLng x = new LatLng(mycurrent.getLatitude(),
mycurrent.getLongitude());
a = x;
System.out.print(a);
} catch (Exception x) {
}
System.out.print(a);
}
LatLng b ;
try{
b = (LatLng) extras.get("Obj1");
draw_route(a, b);
}catch(Exception e){
}
LatLng c = null;
try {
c = (LatLng) extras.get("Obj2");
b = (LatLng) extras.get("Obj1");
draw_route(b, c);
} catch (Exception e) {
System.out.println("smth went wrong");
}
try {
LatLng d = (LatLng) extras.get("Obj3");
draw_route(c, d);
} catch (Exception e) {
System.out.println("smth went wrong");
}
// mMap.addMarker(new MarkerOptions().position(a));
mMap.setMyLocationEnabled(true);
mMap.setOnMyLocationButtonClickListener(this);
// }
// if (!route.ObjLoc1String.isEmpty()) {
}
// }
private final LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
updateWithNewLocation(location);
}
public void onProviderDisabled(String provider) {
updateWithNewLocation(null);
}
public void onProviderEnabled(String provider) {}
public void onStatusChanged(String provider,int status,Bundle extras){}
};
private void updateWithNewLocation(Location location) {
// TextView myLocationText = (TextView) findViewById(R.id.text);
String latLongString = "";
if (location != null) {
double lat = location.getLatitude();
double lng = location.getLongitude();
latLongString = "Lat:" + lat + "\nLong:" + lng;
} else {
latLongString = "No location found";
}
// myLocationText.setText("Your Current Position is:\n" + latLongString);
}
private void setUpLocationClientIfNeeded() {
if (mLocationClient == null) {
mLocationClient = new LocationClient(getApplicationContext(), this, // ConnectionCallbacks
this); // OnConnectionFailedListener
}
}
public void draw_route(LatLng start, LatLng finish) {
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
}
md = new GMapV2Direction();
mMap = ((SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map)).getMap();
LatLng coordinates = new LatLng(54.72, 25.3);
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(coordinates, 10));
mMap.addMarker(new MarkerOptions().position(start).title("Start"));
mMap.addMarker(new MarkerOptions().position(finish).title("End"));
Document doc = md.getDocument(start, finish,
GMapV2Direction.MODE_DRIVING);
int duration = md.getDurationValue(doc);
String distance = md.getDistanceText(doc);
String start_address = md.getStartAddress(doc);
String copy_right = md.getCopyRights(doc);
ArrayList<LatLng> directionPoint = md.getDirection(doc);
PolylineOptions rectLine = new PolylineOptions().width(3).color(
Color.RED);
for (int i = 0; i < directionPoint.size(); i++) {
rectLine.add(directionPoint.get(i));
}
mMap.addPolyline(rectLine);
}
/**
* Button to get current Location. This demonstrates how to get the current
* Location as required without needing to register a LocationListener.
*/
public void showMyLocation(View view) {
if (mLocationClient != null && mLocationClient.isConnected()) {
String msg = "Location = " + mLocationClient.getLastLocation();
Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_SHORT)
.show();
mycurrent = mLocationClient.getLastLocation();
}
}
/**
* Implementation of {@link LocationListener}.
*/
@Override
public void onLocationChanged(Location location) {
mMessageView.setText("Location = " + location);
}
/**
* Callback called when connected to GCore. Implementation of
* {@link ConnectionCallbacks}.
*/
@Override
public void onConnected(Bundle connectionHint) {
mLocationClient.requestLocationUpdates(REQUEST, this); // LocationListener
}
/**
* Callback called when disconnected from GCore. Implementation of
* {@link ConnectionCallbacks}.
*/
@Override
public void onDisconnected() {
// Do nothing
}
/**
* Implementation of {@link OnConnectionFailedListener}.
*/
@Override
public void onConnectionFailed(ConnectionResult result) {
// Do nothing
}
@Override
public boolean onMyLocationButtonClick() {
Toast.makeText(this, "MyLocation button clicked", Toast.LENGTH_SHORT)
.show();
// Return false so that we don't consume the event and the default
// behavior still occurs
// (the camera animates to the user's current position).
return false;
}
}
答案 0 :(得分：0)
public void onLocationChanged(Location location) {
mMessageView.setText("Location = " + location);
draw_route(new LatLng(location.getLatitude(), location.getLongitude()), new LatLng( ... point where should be the end of route ...));
}
我不知道我是否理解正确，但似乎你应该调用draw_route并从传递给onLocationChanged事件的位置获取LatLng。这是起点。此外，您有一些终点作为LatLng作为第二个参数传递给draw_route。在绘制路线中，如果您想获得正确的路线，请使用传递的参数坐标使用Google方向服务，并在接收数据后，您将获得路线中的所有点，并且您还可以绘制正确的折线。