我最近作为一项爱好开始学习Android开发，希望可以开发一个应用程序，使用Google地图找到并跟踪用户的位置。
一旦应用程序获取了GPS锁定，它可以通过绘制覆盖类路径来跟踪用户的移动。
我看过类似Mytracks这样的开源应用程序，但它们对我来说过于复杂了。
理想情况下，我想创建一个看起来像这样的应用程序：
以下是我的代码，不包含导入部分。
我的目标是创建一个geopoints数组。 每次位置发生变化时，就会创建一个新的geopoint。 然后，我尝试使用for循环遍历每个geopoint，并在它们之间绘制路径。
public class Tracking extends MapActivity implements LocationListener {
LocationManager locman;
LocationListener loclis;
Location Location;
private MapView map;
List<GeoPoint> geoPointsArray = new ArrayList<GeoPoint>();
private MapController controller;
String provider = LocationManager.GPS_PROVIDER;
double lat;
double lon;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
initMapView();
initMyLocation();
locman = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// locman.requestLocationUpdates(provider,60000, 100,loclis);
// Location = locman.getLastKnownLocation(provider);
}
/** Find and initialize the map view. */
private void initMapView() {
map = (MapView) findViewById(R.id.map);
controller = map.getController();
map.setSatellite(false);
map.setBuiltInZoomControls(true);
}
/** Find Current Position on Map. */
private void initMyLocation() {
final MyLocationOverlay overlay = new MyLocationOverlay(this, map);
overlay.enableMyLocation();
overlay.enableCompass(); // does not work in emulator
overlay.runOnFirstFix(new Runnable() {
public void run() {
// Zoom in to current location
controller.setZoom(24);
controller.animateTo(overlay.getMyLocation());
}
});
map.getOverlays().add(overlay);
}
@Override
public void onLocationChanged(Location location) {
if (Location != null) {
lat = Location.getLatitude();
lon = Location.getLongitude();
GeoPoint New_geopoint = new GeoPoint((int) (lat * 1e6),
(int) (lon * 1e6));
controller.animateTo(New_geopoint);
}
}
class MyOverlay extends Overlay {
public MyOverlay() {
}
public void draw(Canvas canvas, MapView mapv, boolean shadow) {
super.draw(canvas, mapv, shadow);
Projection projection = map.getProjection();
Path p = new Path();
for (int i = 0; i < geoPointsArray.size(); i++) {
if (i == geoPointsArray.size() - 1) {
break;
}
Point from = new Point();
Point to = new Point();
projection.toPixels(geoPointsArray.get(i), from);
projection.toPixels(geoPointsArray.get(i + 1), to);
p.moveTo(from.x, from.y);
p.lineTo(to.x, to.y);
}
Paint mPaint = new Paint();
mPaint.setStyle(Style.STROKE);
mPaint.setColor(0xFFFF0000);
mPaint.setAntiAlias(true);
canvas.drawPath(p, mPaint);
super.draw(canvas, map, shadow);
}
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
}
应用程序没有错误地运行，但没有路径被绘制，只是当我移动时位置点也在移动。
任何帮助将不胜感激 谢谢。