Android工作室获取用户位置

Question

LatLng Barcelona = new LatLng(Float.parseFloat(String.valueOf(41.3818)), Float.parseFloat(String.valueOf(2.1685)));
    // For zooming automatically to the location of the marker
                    CameraPosition cameraPosition = new CameraPosition.Builder().target(Barcelona).zoom(12).build();
                    googleMap.animateCamera(CameraUpdateFactory.newCameraPosition
                            (cameraPosition ));

我在 Android Studio Activity 中使用 Goole Maps API，我想获取用户的位置，并将变量 "Barcelona" 替换为用户的位置，以便相机专注于用户的位置，谢谢!!!!

Answer 1

如果您只想在 activity 启动时获取一次位置，您可以使用以下代码。

首先创建 FusedLocationProviderClient 对象如下：

FusedLocationProviderClient  fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(SetProfileOnlineActivity.this);

创建对象后，您可以调用 getLastLocation() 方法一次获取用户位置。

fusedLocationProviderClient.getLastLocation().addOnSuccessListener(new OnSuccessListener<Location>() {
                    @Override
                    public void onSuccess(Location location) {
                        if (location != null) {
                            CameraPosition.Builder builder = new CameraPosition.Builder();
                            builder.tilt(30);
                            builder.zoom(18f);
                            builder.target(new LatLng(location.getLatitude(), location.getLongitude()));
                            CameraPosition cameraPosition = builder.build();
                            mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
                        }
                    }
                });

如果您的应用需要持续跟踪位置，它可以向用户提供更多相关信息。

 LocationRequest mLocationRequest = new LocationRequest();
    mLocationRequest.setInterval(10000);
    mLocationRequest.setFastestInterval(5000);
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    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;
    }
    mFusedLocationClient.requestLocationUpdates(mLocationRequest,
            mLocationCallback,
            null /* Looper */);

你的 onCreate 看起来像那样

@Override
protected void onCreate(Bundle savedInstanceState) {
// ...

mLocationCallback = new LocationCallback() {
    @Override
    public void onLocationResult(LocationResult locationResult) {
        for (Location location : locationResult.getLocations()) {
            // Update UI with location data
            // ...
        }
    };
};
}

有关更多信息，请浏览 android 文档

https://developer.android.com/training/location/receive-location-updates.html