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でGoogleマップを表示しています。私はgoogle maps v2を使用しています。私は新しいことをしています。私はボタンを押して地図を開きます。地図上の特定の場所を特定し、その場所を特定した別のアクティビティで再度地図を表示するために経度と緯度を取得します。Googleマップ上のPinPointアクティビティ
Googleマップを操作する方法と、他のアクティビティで表示する方法を混乱させるのですが、次のコードに何を追加する必要がありますか？あなたはmarker.getPosition()によってマーカーのLatLongsを得ることができます
public class MapsActivity extends FragmentActivity {
private GoogleMap mMap; // Might be null if Google Play services APK is not available.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
setUpMapIfNeeded();
}
@Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
}
/**
* Sets up the map if it is possible to do so (i.e., the Google Play services APK is correctly
* installed) and the map has not already been instantiated.. This will ensure that we only ever
* call {@link #setUpMap()} once when {@link #mMap} is not null.
* <p/>
* If it isn't installed {@link SupportMapFragment} (and
* {@link com.google.android.gms.maps.MapView MapView}) will show a prompt for the user to
* install/update the Google Play services APK on their device.
* <p/>
* A user can return to this FragmentActivity after following the prompt and correctly
* installing/updating/enabling the Google Play services. Since the FragmentActivity may not
* have been completely destroyed during this process (it is likely that it would only be
* stopped or paused), {@link #onCreate(Bundle)} may not be called again so we should call this
* method in {@link #onResume()} to guarantee that it will be called.
*/
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
mMap.setMyLocationEnabled(true);
Location currentLocation = mMap.getMyLocation();
if (currentLocation != null) {
updateLocation(currentLocation);
} else {
Log.d(getClass().getName(), "Current location is NULL");
}
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
/**
* This is where we can add markers or lines, add listeners or move the camera. In this case, we
* just add a marker near Africa.
* <p/>
* This should only be called once and when we are sure that {@link #mMap} is not null.
*/
private void setUpMap() {
final LocationManager manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
if (!manager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
buildAlertMessageNoGps();
} else {
LocationListener locationListener = new MyLocationListener();
if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// Activity#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for Activity#requestPermissions for more details.
return;
}
manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 3000, 1, locationListener);
manager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 3000, 1, locationListener);
Location locationGPS = manager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
Location locationNet = manager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
Location loc;
long GPSLocationTime = 0;
if (null != locationGPS) {
GPSLocationTime = locationGPS.getTime();
}
long NetLocationTime = 0;
if (null != locationNet) {
NetLocationTime = locationNet.getTime();
}
if (0 < GPSLocationTime - NetLocationTime) {
loc = locationGPS;
} else {
loc = locationNet;
}
if (loc != null) {
updateLocation(loc);
}
//LatLng sydney = new LatLng(-33.867, 151.206);
}
}
private void buildAlertMessageNoGps() {
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Your GPS seems to be disabled, do you want to enable it?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(@SuppressWarnings("unused") final DialogInterface dialog, @SuppressWarnings("unused") final int id) {
startActivity(new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS));
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(final DialogInterface dialog, @SuppressWarnings("unused") final int id) {
dialog.cancel();
}
});
final AlertDialog alert = builder.create();
alert.show();
}
private class MyLocationListener implements LocationListener {
@Override
public void onLocationChanged(Location loc) {
updateLocation(loc);
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
public void updateLocation(Location loc) {
Toast.makeText(
getBaseContext(),
"Location changed: Lat: " + loc.getLatitude() + " Lng: "
+ loc.getLongitude(), Toast.LENGTH_SHORT).show();
String longitude = "Longitude: " + loc.getLongitude();
Log.v(getClass().getName(), longitude);
String latitude = "Latitude: " + loc.getLatitude();
Log.v(getClass().getName(), latitude);
/*------- To get city name from coordinates -------- */
String cityName = null;
Geocoder gcd = new Geocoder(this, Locale.ENGLISH);
List<Address> addresses;
/*try {
addresses = gcd.getFromLocation(loc.getLatitude(),
loc.getLongitude(), 1);
if (addresses.size() > 0) {
Log.d(getClass().getSimpleName(), (addresses.get(0).getLocality() == null ? "Null" : addresses.get(0).getLocality()));
cityName = addresses.get(0).getLocality();
}
} catch (IOException e) {
e.printStackTrace();
}*/
String s = longitude + "\n" + latitude + "\n\nMy Current City is: "
+ cityName;
Toast.makeText(getApplicationContext(), s, Toast.LENGTH_LONG).show();
LatLng myLocation = new LatLng(loc.getLatitude(), loc.getLongitude());
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
mMap.setMyLocationEnabled(true);
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(myLocation, 13));
mMap.addMarker(new MarkerOptions()
.title(cityName)
.snippet("My Location")
.position(myLocation));
}
}
をありがとう... –
を再び@Dhananjay Kulkami –