无法在Android上获取位置

Question

我想在应用启动时获取设备的位置。

我一直在浏览文档，试图弄清楚出了什么问题，但我似乎无法找到它。永远不会调用onLocationChanged。

viewer.olView.fit(feature.getGeometry(), {
  duration: 1000
});

Answer 1

尝试获得这样的许可：它适用于我的情况

if (!checkIfAlreadyhavePermission()) {
            ActivityCompat.requestPermissions(this, new String[]{"ACCESS_FINE_LOCATION"}, MY_PERMISSION_LOCATION_CODE);
        }

private boolean checkIfAlreadyhavePermission() {
    int result = ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION);
    return result == PackageManager.PERMISSION_GRANTED;
}

public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
    switch (requestCode) {
        case MY_PERMISSION_LOCATION_CODE: {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                  Call_location_updates();
            } else {
                Toast.makeText(getApplicationContext(), getResources().getString(R.string.gps_permission), Toast.LENGTH_LONG).show();
                finish();
            }
            break;
        }
        // other 'case' lines to check for other
        // permissions this app might request
    }
}

还可以像这样创建LocationRequest对象：

private final int INTERVAL = 5000;
private final int FAST_INTERVAL = 1000;

protected void createLocationRequest() {
    mLocationRequest = new LocationRequest();
    mLocationRequest.setInterval(INTERVAL);
    mLocationRequest.setFastestInterval(FAST_INTERVAL);
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}

protected synchronized void buildGoogleApiClient() {

    mGoogleApiClient = new GoogleApiClient.Builder(context)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .addApi(LocationServices.API).build();

}



 public void Call_location_updates(){
         Location location = LocationServices.FusedLocationApi
                    .getLastLocation(mGoogleApiClient);
            if (location != null) {
                onLocationChanged(location);
            }
            LocationServices.FusedLocationApi.requestLocationUpdates(
                    mGoogleApiClient, mLocationRequest, this);

}

 @Override
    public void onLocationChanged(Location location) {
        //do what u want with location
    }