我想在按下alertdialog选项（电子邮件）后更新此活动中的Google地图。该位置已手动设置，但不会更新。它只是保留在alertdialog中，谷歌地图只是刷新但不会转到位置坐标，它返回0,0。
public class MapsTrack extends FragmentActivity implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
GoogleMap.OnMarkerDragListener,
GoogleMap.OnMapLongClickListener,
LocationListener,
View.OnClickListener {
//Our Map
private GoogleMap mMap;
//To store longitude and latitude from map
private double longitude;
private double latitude;
//Buttons
private ImageButton buttonSearch;
private ImageButton buttonCurrent;
private static final int MY_LOCATION_REQUEST_CODE = 1;
//Google ApiClient
private GoogleApiClient googleApiClient;
Location location;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps_track);
// 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);
//Initializing googleapi client
googleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
//Initializing views and adding onclick listeners
buttonSearch = (ImageButton) findViewById(R.id.buttonSearch);
buttonCurrent = (ImageButton) findViewById(R.id.buttonCurrent);
buttonSearch.setOnClickListener(this);
buttonCurrent.setOnClickListener(this);
}
@Override
protected void onStart() {
googleApiClient.connect();
super.onStart();
}
@Override
protected void onStop() {
googleApiClient.disconnect();
super.onStop();
}
//Getting current location
private void getCurrentLocation() {
//Creating a location object
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.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;
}
Location location = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
if (location != null) {
//Getting longitude and latitude
longitude = location.getLongitude();
latitude = location.getLatitude();
//moving the map to location
moveMap();
}
}
//Function to move the map
private void moveMap() {
//String to display current latitude and longitude
String msg = latitude + ", " + longitude;
//Creating a LatLng Object to store Coordinates
LatLng latLng = new LatLng(latitude, longitude);
//Adding marker to map
mMap.addMarker(new MarkerOptions()
.position(latLng) //setting position
.draggable(true) //Making the marker draggable
.title("Current Location")); //Adding a title
//Moving the camera
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
//Animating the camera
mMap.animateCamera(CameraUpdateFactory.zoomTo(15));
//Displaying current coordinates in toast
Toast.makeText(this, msg, Toast.LENGTH_LONG).show();
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
LatLng latLng = new LatLng(-34, 151);
mMap.addMarker(new MarkerOptions().position(latLng).draggable(true));
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.setOnMarkerDragListener(this);
mMap.setOnMapLongClickListener(this);
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
}
@Override
public void onConnected(Bundle bundle) {
}
@Override
public void onDestroy() {
super.onDestroy();
}
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onMapLongClick(LatLng latLng) {
//Clearing all the markers
mMap.clear();
//Adding a new marker to the current pressed position
mMap.addMarker(new MarkerOptions()
.position(latLng)
.draggable(true));
}
@Override
public void onMarkerDragStart(Marker marker) {
}
@Override
public void onMarkerDrag(Marker marker) {
}
@Override
public void onMarkerDragEnd(Marker marker) {
//Getting the coordinates
latitude = marker.getPosition().latitude;
longitude = marker.getPosition().longitude;
//Moving the map
moveMap();
}
@Override
public void onClick(View v) {
if (v == buttonCurrent) {
getCurrentLocation();
moveMap();
} else if (v == buttonSearch) {
final String[] names = new String[]{"ijad_wiz@gmail.com", "nadiaf33@yahoo.com"};
final String name = names[1];
final AlertDialog.Builder alertDialog = new AlertDialog.Builder(MapsTrack.this);
AlertDialog alert = alertDialog.create();
LayoutInflater inflater = getLayoutInflater();
View convertView = (View) inflater.inflate(R.layout.activity_inflate, null);
alertDialog.setView(convertView);
alertDialog.setTitle("Track!");
ListView lv = (ListView) convertView.findViewById(R.id.listView1);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, names);
lv.setAdapter(adapter);
alertDialog.show();
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
switch (name) {
case "email1@gmail.com":
latitude = 3.22094;
longitude = 101.724866;
LatLng latLng1 = new LatLng(3.1466,101.6958);
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng1));
moveMap();
break;
case "email2@yahoo.com":
latitude = 48.8584;
longitude = 2.2945;
LatLng latLng2 = new LatLng(48.8584, 2.2945);
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng2));
moveMap();
break;
}
}
});
}
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
if (requestCode == MY_LOCATION_REQUEST_CODE) {
if (permissions.length == 1 &&
permissions[0] == android.Manifest.permission.ACCESS_FINE_LOCATION &&
grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.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);
} else {
// Permission was denied. Display an error message.
}
}
}
}
答案 0 :(得分：1)
您错过了获取AlertDialog（而不是AlertDialog Builder）的代码：
AlertDialog.Builder builder = new AlertDialog.Builder(this);
AlertDialog alert = builder.create();
// Then you can call on your
// lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
alert.cancel();
// }
此外，您不在此块中设置纬度和经度变量：
LatLng latLng1 = new LatLng(3.1466,101.6958);
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng1));
moveMap();
所以它可能会移动相机并移动回到之前的位置。