如何在Google地图中将相机设置为用户位置

Question

我已经设置了代码，因此可以加载地图，但是直到他们按下缩放按钮时，它才会自动转到用户所在的位置。 我希望它是从用户位置开始还是至少在地图出现后的几秒钟内加载完毕。

Answer 1

在onMapready中使用此代码

@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) {
    return;
}

mMap.setMyLocationEnabled(true);

mMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() {
    @Override
    public void onMyLocationChange(Location location) {

        CameraUpdate center = CameraUpdateFactory.newLatLng(new LatLng(location.getLatitude(), location.getLongitude()));
        CameraUpdate zoom = CameraUpdateFactory.zoomTo(11);
        mMap.clear();

        MarkerOptions mp = new MarkerOptions();

        mp.position(new LatLng(location.getLatitude(), location.getLongitude()));

        mp.title("my position");

        mMap.addMarker(mp);
        mMap.moveCamera(center);
        mMap.animateCamera(zoom);

    }
});}}

Answer 2

xml代码添加地图，如下所示：

<?xml version="1.0" encoding="utf-8"?>
<fragment
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment"/>

添加java代码

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
map = ((SupportMapFragment) 
getSupportFragmentManager().findFragmentById(R.id.map)).getMap();

locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME, MIN_DISTANCE, this); //You can also use LocationManager.GPS_PROVIDER and LocationManager.PASSIVE_PROVIDER        
  }

@Override
public void onLocationChanged(Location location) {
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, 10);
map.animateCamera(cameraUpdate);
locationManager.removeUpdates(this);
  }

 @Override
 public void onStatusChanged(String provider, int status, Bundle extras) { }

 @Override
 public void onProviderEnabled(String provider) { }

 @Override
 public void onProviderDisabled(String provider) { }
 }

在清单中添加权限

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

试试这个代码，它可以帮助您