当农民在他的农场周围移动时，我正在尝试绘制路径以下是我的课程，我的问题是当我开始跟踪线路移动时，即使用户没有移动并且路径没有在他移动时更新
public class RouteOverlay extends Overlay {
private GeoPoint gp1;
private GeoPoint gp2;
private int mode = 1;
public RouteOverlay(GeoPoint paramGeoPoint1, GeoPoint paramGeoPoint2,int paramInt)
{
this.gp1 = paramGeoPoint1;
this.gp2 = paramGeoPoint2;
this.mode = paramInt;
}
public void draw(Canvas paramCanvas, MapView paramMapView,
boolean paramShadow)
{
super.draw(paramCanvas, paramMapView, paramShadow);
Projection projection = paramMapView.getProjection();
Paint mPaint = new Paint();
mPaint.setDither(true);
mPaint.setAntiAlias(true);
mPaint.setColor(Color.RED);
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(3);
mPaint.setAlpha(120);
Point p1 = new Point();
Point p2 = new Point();
Path path = new Path();
projection.toPixels(gp1, p1);
projection.toPixels(gp2, p2);
path.moveTo(p2.x,p2.y);
path.lineTo(p1.x,p1.y);
paramCanvas.drawPath(path, mPaint);
}
主要活动：
public class MainActivity extends MapActivity {
public final LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
coordinates.add(location);
mapView.getController().animateTo(getGeoByLocation(location));
drawRoute(coordinates, mapView);
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_area_measurement);
this.mapView = ((MapView) findViewById(R.id.mapview));
this.mapView.setBuiltInZoomControls(false);
this.mapView.getController().setZoom(17);
this.coordinates = new ArrayList<Location>();
}
protected boolean isRouteDisplayed() {
return false;
}
private GeoPoint getGeoByLocation(Location location) {
GeoPoint gp = null;
try {
if (location != null) {
double geoLatitude = location.getLatitude() * 1E6;
double geoLongitude = location.getLongitude() * 1E6;
gp = new GeoPoint((int) geoLatitude, (int) geoLongitude);
}
} catch (Exception e) {
e.printStackTrace();
}
return gp;
}
public String getLocationProvider(LocationManager paramLocationManager) {
try {
Criteria localCriteria = new Criteria();
localCriteria.setAccuracy(1);
localCriteria.setAltitudeRequired(false);
localCriteria.setBearingRequired(false);
localCriteria.setCostAllowed(true);
localCriteria.setPowerRequirement(3);
String str = paramLocationManager.getBestProvider(localCriteria,
true);
return str;
} catch (Exception localException) {
while (true) {
localException.printStackTrace();
}
}
}
private void drawRoute(ArrayList<Location> paramArrayList,MapView paramMapView) {
List<Overlay> overlays = paramMapView.getOverlays();
//Changed for smooth rendering
overlays.clear();
for (int i = 1; i < paramArrayList.size(); i++) {
overlays.add(new RouteOverlay(getGeoByLocation(paramArrayList.get(i - 1)), getGeoByLocation(paramArrayList.get(i)),2));
}
}
public void startRecording() {
this.isMeasuring = true;
lm = (LocationManager) getSystemService(LOCATION_SERVICE);
lm.requestLocationUpdates(getLocationProvider(lm),500,2,this.locationListener);
/*if (lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER)){
gpsstatus.setText("Gps Is Enabled");
}else
{ gpsstatus.setText("Gps Is disabled");}*/
}