我已经创建了一个Map活动，我希望在用户输入地点名称时，我会在其中建议各种地方。当用户进行任何选择时，地图应位于所选位置。我已经使用了PlaceSelectionListener。虽然我能够获得纬度和经度，但地图似乎并没有定位。它需要先前设置的位置。我已在下面附上我的代码以供参考。
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
MapDialog mapDialog;
Button button;
TextView textView;
LocationManager mLocationManager;
GooglePlacesAutocompleteAdapter dataAdapter;
EditText et;
ListView listView;
@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.
button = (Button) findViewById(R.id.button);
textView = (TextView) findViewById(R.id.text_view);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
button.setVisibility(View.INVISIBLE);
Location location = getLastKnownLocation();
if (location != null) {
LatLng userLocation = new LatLng(location.getLatitude(), location.getLongitude());
textView.setVisibility(View.VISIBLE);
textView.setText(getAddress(getApplicationContext(), userLocation.latitude, userLocation.longitude));
}
}
});
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Turn on Location").setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Intent onGPS = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(onGPS);
}
}).setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
}
}).setMessage("Turn on Location services to access the application");
int off = 0;
try {
off = Settings.Secure.getInt(getContentResolver(), Settings.Secure.LOCATION_MODE);
} catch (Settings.SettingNotFoundException e) {
e.printStackTrace();
}
if (off == 0) {
builder.show();
} else {
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
PlaceAutocompleteFragment autocompleteFragment = (PlaceAutocompleteFragment) this.getFragmentManager().findFragmentById(R.id.place_autocomplete_fragment);
autocompleteFragment.setOnPlaceSelectedListener(_placeSelectedListener);
}
@Override
protected void onResume() {
super.onResume();
Log.e("TAG", "onResume");
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.
*/
private PlaceSelectionListener _placeSelectedListener = new PlaceSelectionListener() {
@Override
public void onPlaceSelected(Place place) {
Log.e("TAG", "place is " + String.valueOf(place.getLatLng().latitude + " " + place.getLatLng().longitude));
final Place xyz=place;
getWindow().getDecorView().findViewById(R.id.map).invalidate();
final OnMapReadyCallback onMapReadyCallback = new OnMapReadyCallback() {
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Add a marker in Sydney and move the camera
LatLng sydney = new LatLng(xyz.getLatLng().latitude, xyz.getLatLng().longitude);
mMap.addMarker(new MarkerOptions().position(sydney).title("Current Location"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(xyz.getLatLng(), 15));
Log.e("GAT","Address "+getAddress(getApplicationContext(),xyz.getLatLng().latitude, xyz.getLatLng().longitude));
}
};
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(onMapReadyCallback);
//Place model has all data about Location selected from search box
}
@Override
public void onError(Status status) {
}
};
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
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);
LocationManager service = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
String provider = service.getBestProvider(criteria, false);
Location location = getLastKnownLocation();
// service.getLastKnownLocation(provider);
Log.e("TAG", "onResume" + location);
if (location != null) {
LatLng userLocation = new LatLng(location.getLatitude(), location.getLongitude());
Log.e("TAG", "Location is " + userLocation + " " + userLocation.latitude + " " + userLocation.longitude);
// Add a marker in Sydney and move the camera
LatLng sydney = new LatLng(userLocation.latitude, userLocation.longitude);
mMap.addMarker(new MarkerOptions().position(sydney).title("Current Location"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(userLocation, 15));
Log.e("GAT","Address "+getAddress(getApplicationContext(),userLocation.latitude,userLocation.longitude));
}
}
private Location getLastKnownLocation() {
mLocationManager = (LocationManager) getApplicationContext().getSystemService(LOCATION_SERVICE);
List<String> providers = mLocationManager.getProviders(true);
Location bestLocation = null;
for (String provider : providers) {
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 null;
}
Location l = mLocationManager.getLastKnownLocation(provider);
if (l == null) {
continue;
}
if (bestLocation == null || l.getAccuracy() < bestLocation.getAccuracy()) {
// Found best last known location: %s", l);
bestLocation = l;
}
}
return bestLocation;
}
public String getAddress(Context context, double lat, double lng) {
Geocoder geocoder = new Geocoder(context, Locale.getDefault());
try {
List<android.location.Address> addresses = geocoder.getFromLocation(lat, lng, 1);
android.location.Address obj = addresses.get(0);
/*String add = obj.getAddressLine(0);
add = add + "\n" + obj.getCountryName();
add = add + "\n" + obj.getCountryCode();
add = add + "\n" + obj.getAdminArea();
add = add + "\n" + obj.getPostalCode();
add = add + "\n" + obj.getSubAdminArea();
add = add + "\n" + obj.getLocality();
add = add + "\n" + obj.getSubThoroughfare();*/
String add = obj.getAddressLine(0)+","+obj.getPostalCode()+" "+obj.getAdminArea()+" "+obj.getCountryCode();
return add;
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
return null;
}
}
}
答案 0 :(得分：0)
我还没有尝试过，但是尝试创建onMapReady()到onConnected()，添加从onCreate()到onMapReady()的buildGoogleApiClient（）调用
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
//buildGoogleApiClient();
// 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);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.setMyLocationEnabled(true);
//add this here:
buildGoogleApiClient();
//LatLng loc = new LatLng(lat, lng);
//mMap.moveCamera(CameraUpdateFactory.newLatLng(loc));
}
@Override
public void onConnected(Bundle bundle) {
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
mGoogleApiClient);
if (mLastLocation != null) {
lat = mLastLocation.getLatitude();
lng = mLastLocation.getLongitude();
mMap.moveCamera(CameraUpdateFactory.newLatLng(loc));
}
}
您可以使用requestLocationUpdates()，并在第一个位置进入时致电removeLocationUpdates()。
这是一个演示应用，可以帮助您了解地图api的工作原理：https://github.com/googlemaps/android-samples/tree/master/ApiDemos
答案 1 :(得分：0)
确保您的 Activity 扩展并实现这些类
... extends FragmentActivity implements OnMapReadyCallback
例子，看下面的代码
public class LocationPickerActivity extends FragmentActivity implements OnMapReadyCallback{