-1
在我的android應用程序中，我必須獲取當前的GPS /網絡位置，然後獲取該位置的谷歌地圖。但在獲取位置之前，地圖已經加載，每個時間它得到（0,0）position.How我可以延遲On mapready調用，直到我得到的位置。如何在基於Google地圖的應用程序中延遲MapMap調用
代碼
package com.example.partha.map;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.util.Log;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
private Position position;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
@Override
public void onMapReady(GoogleMap googleMap) {
try {
mMap = googleMap;
// Add a marker in Sydney and move the camera
position = new Position(this);
position.getLocation(Position.NETWORK);
LatLng sydney = new LatLng(position.getLatitude(),position.getLongitude());
Log.d("position",position.getLatitude()+" "+position.getLatitude());
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in your position"));
Log.d("Added marker", " at position");
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
Log.d("moved marker", " at position");
}catch (Exception e)
{
Log.d("from on map",e.getMessage());
}
}
}
position.class
public class Position {
private boolean GPSPosition;
private boolean networkPosition;
private boolean SavedPosition;
private Context context;
private LatLng latLng;
private double latitude;
private double longitude;
private LocationManager locationManager;
private LocationListener listener;
static public final int GPS = 2;
static public final int NETWORK = 1;
private float minDistance=5000;
private long updateTime=0;
public Position(Context context) {
this.context = context;
locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
setListener();
}
public Position(Context context, float minDistance, long updateTime) {
this.context = context;
this.minDistance = minDistance;
this.updateTime = updateTime;
}
public void setUpdateTime(long updateTime) {
this.updateTime = updateTime;
}
public void setMinDistance(float minDistance) {
this.minDistance = minDistance;
}
@TargetApi(Build.VERSION_CODES.M)
public void getLocation(int source) {
if (source == GPS) {
if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
return;
}
else
{
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, updateTime, minDistance, listener);
}
}
else if(source==NETWORK)
{
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,updateTime,minDistance,listener);
}
}
public double getLongitude() {
return longitude;
}
public double getLatitude() {
return latitude;
}
public LatLng getLatLng() {
return latLng;
}
private void setListener()
{
listener=new LocationListener() {
@Override
public void onLocationChanged(Location location) {
latitude=location.getLatitude();
longitude=location.getLongitude();
latLng=new LatLng(latitude,longitude);
Log.d("Your position",latitude+" "+longitude);
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
Intent settingsActivity = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
context.startActivity(settingsActivity);
}
};
}
}