* 请告诉我如何在程序启动时将地理位置设置为当前位置？我想在标记为“你在这里”的程序启动时将叠加气球设置为模拟器中用户的当前位置。我的代码在这里 - *
package com.jbb;
import java.util.List;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Point;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.MotionEvent;
import android.widget.Toast;
public class jbb_latitudeActivity extends MapActivity
{
LocationManager lm;
MyLocationListener locationListener;
MapView mapView;
MapController mc;
GeoPoint geoPoint;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
try{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
geoPoint = new GeoPoint( (int) (12.949997* 1E6), (int) (80.140213 * 1E6));
mapView = (MapView) findViewById(R.id.name);
mc = mapView.getController();
mc.animateTo(geoPoint);
mapView.setClickable(true);
mapView.setBuiltInZoomControls(true);
mapView.setSatellite(true);
mapView.setTraffic(true);
List<Overlay> overlays = mapView.getOverlays();
overlays.clear();
overlays.add(new MyLocationListener());
//---use the LocationManager class to obtain GPS locations---
lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,new MyLocationListener());
}
catch (Exception e) {
// TODO: handle exception
Toast.makeText(getApplicationContext(),e.toString() , 1).show();
}
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
private class MyLocationListener extends Overlay implements LocationListener
{
public void draw(Canvas canvas, MapView mapView, boolean shadow) { // 1
super.draw(canvas, mapView, shadow);
if (!shadow) { // 2
Point point = new Point();
mapView.getProjection().toPixels(geoPoint, point); // 3
Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.marker_default); // 4
int x = point.x - bmp.getWidth() / 2; // 5 inty=point.ybmp.getHeight(); // 6 canvas.drawBitmap(bmp,x,y,null); // 7
}
}
public boolean onTouchEvent(MotionEvent event, MapView mapView)
{
//---when user lifts his finger---
if (event.getAction() == 1) {
GeoPoint p = mapView.getProjection().fromPixels(
(int) event.getX(),
(int) event.getY());
}
return false;
}
public boolean onTap(GeoPoint point, MapView mapView)
{
String msg = "Lat:: " + point.getLatitudeE6()/1E6 + " - " +
"Lon:: " + point.getLongitudeE6()/1E6;
Toast.makeText(mapView.getContext(), msg,1).show();
return true;
}
@Override
public void onLocationChanged(Location loc) {
if (loc != null) {
Toast.makeText(mapView.getContext(),
"Location changed : Lat: " + loc.getLatitude() +
" Lng: " + loc.getLongitude(),
1).show();
GeoPoint p = new GeoPoint(
(int) (loc.getLatitude() * 1E6),
(int) (loc.getLongitude() * 1E6));
mc.animateTo(p);
mc.setZoom(15);
mapView.invalidate();
}
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
Toast.makeText(mapView.getContext(), "hee", 1).show();
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
Toast.makeText(mapView.getContext(), "hee", 1).show();
}
@Override
public void onStatusChanged(String provider, int status,
Bundle extras) {
// TODO Auto-generated method stub
Toast.makeText(mapView.getContext(), "hee", 1).show();
}
}
}
答案 0 :(得分：6)
这对我有用......我希望它会对你有所帮助。如果喜欢标记它。
public class MyGoogleMapActivity extends MapActivity implements LocationListener {
/** Called when the activity is first created. */
EditText txted = null;
Button btnSimple = null;
MapView gMapView = null;
MapController mc = null;
Drawable defaultMarker = null;
GeoPoint p = null;
double lattitude=18.5297 ;
double longitude=73.8491 ;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
txted=(EditText)findViewById(R.id.id1);
String currentLocation="Lattitude :"+lattitude+" Longitude :"+longitude;
txted.setText(currentLocation);
gMapView=(MapView)findViewById(R.id.myGMap);
p= new GeoPoint((int)(lattitude * 1E6), (int)(longitude * 1E6));
Canvas canvas=new Canvas();
MyLocationOverlay locationOverlay=new MyLocationOverlay();
List<Overlay> list=gMapView.getOverlays();
list.add(locationOverlay);
ZoomControls zoomControls=(ZoomControls) gMapView.getZoomControls();
zoomControls.setLayoutParams(new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
gMapView.addView(zoomControls);
gMapView.displayZoomControls(true);
mc=gMapView.getController();
mc.setCenter(p);
mc.animateTo(p);
mc.setZoom(14);
LocationManager locationManager=(LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000L, 500.0f, this);
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
@Override
public void onLocationChanged(Location location) {
if(location!=null){
double lat=location.getLatitude();
double lng=location.getLongitude();
String currentLocation="Lattitude :"+lat+" Longitude :"+lng;
txted.setText(currentLocation);
mc.animateTo(p);
}
}
@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
}
protected class MyLocationOverlay extends com.google.android.maps.Overlay{
@Override
public boolean draw(Canvas canvas, MapView mapView, boolean shadow,
long when) {
Paint paint=new Paint();
super.draw(canvas, mapView, shadow, when);
Point myScreenCords= new Point();
mapView.getProjection().toPixels(p, myScreenCords);
paint.setStrokeWidth(1);
paint.setARGB(255, 255, 255, 255);
paint.setStyle(Paint.Style.STROKE);
Bitmap bmp=BitmapFactory.decodeResource(getResources(), R.drawable.marker);
canvas.drawBitmap(bmp, myScreenCords.x, myScreenCords.y, paint);
canvas.drawText("I m here...", myScreenCords.x,myScreenCords.y, paint);
return true;
}
@Override
public boolean onTouchEvent(MotionEvent e, MapView mapView) {
super.onTouchEvent(e, mapView);
if(e.getAction()==1){
GeoPoint gp=gMapView.getProjection().fromPixels((int)e.getX(),(int)e.getY());
}
return true;
}
}
答案 1 :(得分：2)
http://mobiforge.com/developing/story/using-google-maps-android
这是Android版Google地图上示例的最佳网站。
答案 2 :(得分：1)
首先，您应该已添加权限
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
然后试试，
Criteria criteria = new Criteria();
String bestProvider = locationManager.getBestProvider(criteria, true);
Location location = locationManager.getLastKnownLocation(bestProvider);
locationManager.requestLocationUpdates(bestProvider, 0, 0, new TestLocationListener());
代替，
lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,new MyLocationListener());