我可以从参考文献中绘制两组地理坐标之间的路径
j2memaprouteprovider。
我能够获得当前位置的纬度和经度
如何在以下类中实现这些坐标以获取从当前位置到目标位置的路径。
MapRouteActivity.java
public class MapRouteActivity extends MapActivity {
LinearLayout linearLayout;
MapView mapView;
private Road mRoad;
static Context context = null;
String GPSPROVIDER = LocationManager.GPS_PROVIDER;
private static final long MIN_GEOGRAPHIC_POOLING_TIME_PERIOD = 10000;
private static final float MIN_GEOGRAPHIC_POOLING_DISTANCE = (float) 5.0;
public LocationManager gpsLocationManager;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true);
context = this;
/* Get a listener for GPS */
LocationListener gpsLocationListener = null;
gpsLocationListener = new GpsLocationListener(this);
/* Start Location Service for GPS */
gpsLocationManager = (LocationManager) this
.getSystemService(Context.LOCATION_SERVICE);
/* Register GPS listener with Location Manager */
gpsLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
MIN_GEOGRAPHIC_POOLING_TIME_PERIOD,
MIN_GEOGRAPHIC_POOLING_DISTANCE, gpsLocationListener);
if (gpsLocationManager == null) {
gpsLocationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_GEOGRAPHIC_POOLING_TIME_PERIOD,
MIN_GEOGRAPHIC_POOLING_DISTANCE, gpsLocationListener);
}
boolean isAvailableGps = gpsLocationManager
.isProviderEnabled(GPSPROVIDER);
if (isAvailableGps) {
Location loc = gpsLocationManager.getLastKnownLocation("gps");
if (loc != null) {
double lattitude = loc.getLatitude();
double longitude = loc.getLongitude();
Toast.makeText(
MapRouteActivity.this,
"Longitude iss " + lattitude + " Latitude iss "
+ longitude, Toast.LENGTH_LONG).show();
}
}
new Thread() {
@Override
public void run() {
double fromLat = 49.85, fromLon = 24.016667, toLat = 50.45, toLon = 30.523333;
String url = RoadProvider
.getUrl(fromLat, fromLon, toLat, toLon);
InputStream is = getConnection(url);
mRoad = RoadProvider.getRoute(is);
mHandler.sendEmptyMessage(0);
}
}.start();
}
Handler mHandler = new Handler() {
public void handleMessage(android.os.Message msg) {
TextView textView = (TextView) findViewById(R.id.description);
textView.setText(mRoad.mName + " " + mRoad.mDescription);
MapOverlay mapOverlay = new MapOverlay(mRoad, mapView);
List<Overlay> listOfOverlays = mapView.getOverlays();
listOfOverlays.clear();
listOfOverlays.add(mapOverlay);
mapView.invalidate();
};
};
private InputStream getConnection(String url) {
InputStream is = null;
try {
URLConnection conn = new URL(url).openConnection();
is = conn.getInputStream();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return is;
}
@Override
protected boolean isRouteDisplayed() {
return false;
}
public static class GpsLocationListener implements LocationListener {
private ImageView mCurrentPointer;
public GpsLocationListener(Context context) {
}
public void onLocationChanged(Location loc) {
if (loc != null) {
double latitude = loc.getLatitude();
double longitude = loc.getLongitude();
GeoPoint point = new GeoPoint((int) (latitude * 1E6),
(int) (longitude * 1E6));
Toast.makeText(
context,
"Longitude is " + longitude + " Latitude is "
+ latitude, Toast.LENGTH_LONG).show();
}
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
}
class MapOverlay extends com.google.android.maps.Overlay {
Road mRoad;
ArrayList<GeoPoint> mPoints;
public MapOverlay(Road road, MapView mv) {
mRoad = road;
if (road.mRoute.length > 0) {
mPoints = new ArrayList<GeoPoint>();
for (int i = 0; i < road.mRoute.length; i++) {
mPoints.add(new GeoPoint((int) (road.mRoute[i][1] * 1000000),
(int) (road.mRoute[i][0] * 1000000)));
}
int moveToLat = (mPoints.get(0).getLatitudeE6() + (mPoints.get(
mPoints.size() - 1).getLatitudeE6() - mPoints.get(0)
.getLatitudeE6()) / 2);
int moveToLong = (mPoints.get(0).getLongitudeE6() + (mPoints.get(
mPoints.size() - 1).getLongitudeE6() - mPoints.get(0)
.getLongitudeE6()) / 2);
GeoPoint moveTo = new GeoPoint(moveToLat, moveToLong);
MapController mapController = mv.getController();
mapController.animateTo(moveTo);
mapController.setZoom(7);
}
}
@Override
public boolean draw(Canvas canvas, MapView mv, boolean shadow, long when) {
super.draw(canvas, mv, shadow);
drawPath(mv, canvas);
return true;
}
public void drawPath(MapView mv, Canvas canvas) {
int x1 = -1, y1 = -1, x2 = -1, y2 = -1;
Paint paint = new Paint();
paint.setColor(Color.GREEN);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(3);
for (int i = 0; i < mPoints.size(); i++) {
Point point = new Point();
mv.getProjection().toPixels(mPoints.get(i), point);
x2 = point.x;
y2 = point.y;
if (i > 0) {
canvas.drawLine(x1, y1, x2, y2, paint);
}
x1 = x2;
y1 = y2;
}
}
}
我想在上面的代码中将当前位置lattiude和经度值分配给fromLat和fronLon变量：
new Thread() {
@Override
public void run() {
double fromLat = 49.85, fromLon = 24.016667, toLat = 50.45, toLon = 30.523333;
String url = RoadProvider
.getUrl(fromLat, fromLon, toLat, toLon);
InputStream is = getConnection(url);
mRoad = RoadProvider.getRoute(is);
mHandler.sendEmptyMessage(0);
}
}.start();
帮助!!
答案 0 :(得分：1)
非常简单---
让您的活动如下： -
public class GoogleMapLocationActivity extends MapActivity {
private LocationManager myLocationManager;
private LocationListener myLocationListener;
private TextView myLongitude, myLatitude;
private MapView myMapView;
private MapController myMapController;
LinearLayout zoomLayout;
GeoPoint myLastPosition;
AddItemizedOverlay mapOvlay;
private void CenterLocatio(GeoPoint centerGeoPoint)
{
myMapController.animateTo(centerGeoPoint);
List<Overlay> mapOverlays = myMapView.getOverlays();
Drawable drawable = this.getResources().getDrawable(R.drawable.map_point);
if(myLastPosition != null){
mapOvlay = new AddItemizedOverlay(myLastPosition ,centerGeoPoint,drawable );
OverlayItem overlayitem = new OverlayItem(centerGeoPoint,"","" );
mapOvlay.addOverlay(overlayitem);
mapOverlays.add(mapOvlay);
}
myLastPosition = centerGeoPoint;
};
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myMapView = (MapView)findViewById(R.id.mapview);
myLastPosition = null;
myMapController = myMapView.getController();
myMapController.setZoom(18); //Fixed Zoom Level
myLocationManager = (LocationManager)getSystemService(
Context.LOCATION_SERVICE);
myLocationListener = new MyLocationListener();
myLocationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
0,
0,
myLocationListener);
private class MyLocationListener implements LocationListener{
public void onLocationChanged(Location argLocation) {
GeoPoint myGeoPoint = new GeoPoint(
(int)(argLocation.getLatitude()*1000000),
(int)(argLocation.getLongitude()*1000000));
GeoPoint newGeoPoint = new GeoPoint(myGeoPoint.getLatitudeE6() ,myGeoPoint.getLongitudeE6());
CenterLocatio(newGeoPoint);
}
public void onProviderDisabled(String provider) {
Toast.makeText(getBaseContext(),"GPS Disabled" ,Toast.LENGTH_SHORT).show();
}
public void onProviderEnabled(String provider) {
Toast.makeText(getBaseContext(),"GPS Enabled" ,Toast.LENGTH_SHORT).show();
}
public void onStatusChanged(String provider,
int status, Bundle extras) {
Toast.makeText(getBaseContext(),"GPS Unavailable" ,Toast.LENGTH_SHORT).show();
}
}
@Override
protected boolean isRouteDisplayed() {
return false;
};
}
AddItemizedOverlay.class -----
public class AddItemizedOverlay extends ItemizedOverlay<OverlayItem> {
private ArrayList<OverlayItem> mapOverlays = new ArrayList<OverlayItem>();
private Context context;
private GeoPoint mGpt1;
private GeoPoint mGpt2;
public AddItemizedOverlay(GeoPoint gp1,GeoPoint gp2, Drawable defaultMarker) {
super(boundCenterBottom(defaultMarker));
mGpt1 = gp1;
mGpt2 = gp2;
}
public AddItemizedOverlay(Drawable defaultMarker) {
super(boundCenterBottom(defaultMarker));
}
public AddItemizedOverlay(Drawable defaultMarker, Context context) {
this(defaultMarker);
this.context = context;
}
@Override
protected OverlayItem createItem(int i) {
return mapOverlays.get(i);
}
@Override
public int size() {
return mapOverlays.size();
}
@Override
protected boolean onTap(int index) {
Log.e("Tap", "Tap Performed");
return true;
}
public void addOverlay(OverlayItem overlay) {
mapOverlays.add(overlay);
this.populate();
}
public boolean draw(Canvas canvas, MapView mapView, boolean shadow,
long when) {
super.draw(canvas, mapView, shadow);
Paint paint;
paint = new Paint();
paint.setColor(Color.RED);
paint.setAntiAlias(true);
paint.setStyle(Style.STROKE);
paint.setStrokeWidth(2);
Point pt1 = new Point();
Point pt2 = new Point();
Projection projection = mapView.getProjection();
projection.toPixels(mGpt1, pt1);
projection.toPixels(mGpt2, pt2);
canvas.drawLine(pt1.x, pt1.y, pt2.x, pt2.y, paint);
return true;
}
}
希望它能帮到你......
答案 1 :(得分：0)
使用以下内容，它将在原生地图应用程序上显示方向，
final Intent intent = new Intent(Intent.ACTION_VIEW,
Uri.parse(
"http://maps.google.com/maps?" +
"saddr="+YOUR_START_LONGITUDE+","+YOUR_START_LATITUDE+"&daddr="YOUR_END_LONGITUDE+","+YOUR_END_LATITUDE));
intent.setClassName(
"com.google.android.apps.maps",
"com.google.android.maps.MapsActivity");
startActivity(intent);