我目前正在制作一个带有谷歌地图的片段.一旦用户访问该片段,他的地图应该缩放并关注他的位置.但是,它显示的是世界地图而不是附近的位置(靠近用户):
@SuppressWarnings("unused")
public class DeferredMapFragment extends MapFragment implements GoogleMap.OnCameraChangeListener, OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener,
LocationListener {
private static final String TAG = "DeferredMapFragment";
private Deque pendingActions;
private AbstractMap tags;
private GoogleMap map;
private LocationRequest mLocationRequest;
private GoogleApiClient mGoogleApiClient;
private Location mLastLocation;
private Marker marker;
private GoogleMap.OnCameraChangeListener cameraChangeListener = null;
private boolean isMapReady = false;
/*
* INTERNALS
*/
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if (getMap() != null) {
map = getMap();
getMap().setOnCameraChangeListener(this);
}
}
@Override
public void onCameraChange(CameraPosition cameraPosition) {
isMapReady = true;
if (pendingActions != null) {
int i = pendingActions.size();
while (i > 0) {
pendingActions.pop().run();
--i;
}
}
if (cameraChangeListener != null) {
cameraChangeListener.onCameraChange(cameraPosition);
}
if (getMap() != null) {
getMap().setOnCameraChangeListener(cameraChangeListener);
}
}
private void execute(Runnable action) {
if (action == null) {
return;
}
if (isMapReady) {
action.run();
} else {
if (pendingActions == null) {
pendingActions = new LinkedList<>();
}
pendingActions.add(action);
}
}
/*
* TAGGING
*/
private void addTag(Marker key, Object value) {
if (tags == null) {
tags = new HashMap<>();
}
tags.put(key, value);
}
public Object getTag(Marker key) {
return tags != null ? tags.get(key) : null;
}
/*
* LISTENERS
*/
public void setOnInfoWindowClickListener(final GoogleMap.OnInfoWindowClickListener listener) {
execute(new Runnable() {
@Override
public void run() {
getMap().setOnInfoWindowClickListener(listener);
}
});
}
public void setOnCameraChangeListener(final GoogleMap.OnCameraChangeListener listener) {
cameraChangeListener = listener;
}
public void setOnMarkerClickListener(final GoogleMap.OnMarkerClickListener listener) {
execute(new Runnable() {
@Override
public void run() {
getMap().setOnMarkerClickListener(listener);
}
});
}
public void setOnMapClickListener(final GoogleMap.OnMapClickListener listener) {
execute(new Runnable() {
@Override
public void run() {
getMap().setOnMapClickListener(listener);
}
});
}
/*
* MAP OVERLAYS
*/
public void addPolyline(final PolylineOptions options) {
execute(new Runnable() {
@Override
public void run() {
getMap().addPolyline(options);
}
});
}
public void addPolygon(final PolygonOptions options) {
execute(new Runnable() {
@Override
public void run() {
getMap().addPolygon(options);
}
});
}
public void addCircle(final CircleOptions options) {
execute(new Runnable() {
@Override
public void run() {
getMap().addCircle(options);
}
});
}
public void addMarker(final MarkerOptions options) {
addMarker(options, null);
}
public void addMarker(final MarkerOptions options, final Object tag) {
execute(new Runnable() {
@Override
public void run() {
Marker marker = getMap().addMarker(options);
if (tag != null) {
addTag(marker, tag);
}
}
});
}
public void addGroundOverlay(final GroundOverlayOptions options) {
execute(new Runnable() {
@Override
public void run() {
getMap().addGroundOverlay(options);
}
});
}
public void addTileOverlay(final TileOverlayOptions options) {
execute(new Runnable() {
@Override
public void run() {
getMap().addTileOverlay(options);
}
});
}
/*
* UI SETTINGS
*/
public void setMapToolbarEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setMapToolbarEnabled(enabled);
}
});
}
public void setPadding(final int left, final int top, final int right, final int bottom) {
execute(new Runnable() {
@Override
public void run() {
getMap().setPadding(left, top, right, bottom);
}
});
}
public void setZoomControlsEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setZoomControlsEnabled(enabled);
}
});
}
public void setCompassEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setCompassEnabled(enabled);
}
});
}
public void setMyLocationButtonEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setMyLocationButtonEnabled(enabled);
}
});
}
public void setIndoorLevelPickerEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setIndoorLevelPickerEnabled(enabled);
}
});
}
public void setScrollGesturesEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setScrollGesturesEnabled(enabled);
}
});
}
public void setZoomGesturesEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setZoomGesturesEnabled(enabled);
}
});
}
public void setTiltGesturesEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setTiltGesturesEnabled(enabled);
}
});
}
public void setRotateGesturesEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setRotateGesturesEnabled(enabled);
}
});
}
public void setAllGesturesEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setAllGesturesEnabled(enabled);
}
});
}
public void setInfoWindowAdapter(final GoogleMap.InfoWindowAdapter adapter) {
execute(new Runnable() {
@Override
public void run() {
getMap().setInfoWindowAdapter(adapter);
}
});
}
@Override
public void onMapReady(GoogleMap googleMap) {
map = googleMap;
setUpMap();
}
public void setUpMap() {
map.setMapType(GoogleMap.MAP_TYPE_HYBRID);
if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getContext(), 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;
}
map.setMyLocationEnabled(true);
}
@Override
public void onConnected(Bundle bundle) {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
//mLocationRequest.setSmallestDisplacement(0.1F);
if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getContext(), 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;
}
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onLocationChanged(Location location) {
mLastLocation = location;
//remove previous current location Marker
if (marker != null){
marker.remove();
}
double dLatitude = mLastLocation.getLatitude();
double dLongitude = mLastLocation.getLongitude();
marker = map.addMarker(new MarkerOptions().position(new LatLng(dLatitude, dLongitude))
.title("My Location").icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_RED)));
map.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(dLatitude, dLongitude), 8));
}
@Override
public void onPause() {
super.onPause();
if (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(getContext())
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
}
有缩放功能吗？另外我的api允许我访问用户的邮政编码.我可以用它吗？我要求用户显示他附近的位置.
这与我在这里的其他答案类似,但是,由于您正在扩展MapFragment并在Fragment中实现自定义行为,因此这是不同的.
下面是一个扩展SupportMapFragment的示例片段,在启动时它将获取用户的当前位置,放置标记并放大:
public class MapFragment extends SupportMapFragment
implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener {
GoogleMap mGoogleMap;
SupportMapFragment mapFrag;
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
Marker mCurrLocationMarker;
@Override
public void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
if (mGoogleMap == null) {
getMapAsync(this);
}
}
@Override
public void onPause() {
super.onPause();
//stop location updates when Activity is no longer active
if (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
}
@Override
public void onMapReady(GoogleMap googleMap)
{
mGoogleMap=googleMap;
mGoogleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
//Initialize Google Play Services
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
//Location Permission already granted
buildGoogleApiClient();
mGoogleMap.setMyLocationEnabled(true);
} else {
//Request Location Permission
checkLocationPermission();
}
}
else {
buildGoogleApiClient();
mGoogleMap.setMyLocationEnabled(true);
}
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(getActivity())
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
}
@Override
public void onConnected(Bundle bundle) {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (ContextCompat.checkSelfPermission(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
}
@Override
public void onConnectionSuspended(int i) {}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {}
@Override
public void onLocationChanged(Location location)
{
mLastLocation = location;
if (mCurrLocationMarker != null) {
mCurrLocationMarker.remove();
}
//Place current location marker
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("Current Position");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
mCurrLocationMarker = mGoogleMap.addMarker(markerOptions);
//move map camera
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng,11));
}
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
private void checkLocationPermission() {
if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)) {
// Show an explanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
new AlertDialog.Builder(getActivity())
.setTitle("Location Permission Needed")
.setMessage("This app needs the Location permission, please accept to use location functionality")
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//Prompt the user once explanation has been shown
ActivityCompat.requestPermissions(getActivity(),
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION );
}
})
.create()
.show();
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(getActivity(),
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION );
}
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_LOCATION: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted, yay! Do the
// location-related task you need to do.
if (ContextCompat.checkSelfPermission(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
if (mGoogleApiClient == null) {
buildGoogleApiClient();
}
mGoogleMap.setMyLocationEnabled(true);
}
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
Toast.makeText(getActivity(), "permission denied", Toast.LENGTH_LONG).show();
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
}
}
由于Location权限请求需要通过Activity,因此您需要将Activity中的结果路由到Fragment的onRequestPermissionsResult()方法:
public class MainActivity extends AppCompatActivity {
MapFragment mapFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mapFragment = new MapFragment();
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.add(R.id.mapframe, mapFragment);
transaction.commit();
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
if (requestCode == MapFragment.MY_PERMISSIONS_REQUEST_LOCATION){
mapFragment.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
else {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
}
布局只包含MapFragment所在的FrameLayout.
activity_main.xml中:
结果
首先提示位置权限:
授予位置权限后,使用标记显示当前位置:
如果用户拒绝或撤消"位置"权限,则会在应用启动时显示:
一,解释:
然后,位置权限请求:
京公网安备 11010802040832号 | 京ICP备19059560号-6 