android - 如何在google map android中获取当前位置

实际上我的问题是我没有尝试多种方法获取当前位置的纬度和经度。我知道这个问题已经在SO中问过了，我尝试了答案也仍然没有得到答案。请帮助我
代码:

    if (googleMap == null) {
        googleMap = ((MapFragment) getFragmentManager().findFragmentById(
                R.id.map)).getMap();

        // check if map is created successfully or not
        if (googleMap == null) {
            Toast.makeText(getApplicationContext(),
                    "Sorry! unable to create maps", Toast.LENGTH_SHORT)
                    .show();
        }
    }
    googleMap.setMyLocationEnabled(true);
    Location myLocation = googleMap.getMyLocation();  //Nullpointer exception.........
    LatLng myLatLng = new LatLng(myLocation.getLatitude(),
            myLocation.getLongitude());

    CameraPosition myPosition = new CameraPosition.Builder()
            .target(myLatLng).zoom(17).bearing(90).tilt(30).build();
    googleMap.animateCamera(
        CameraUpdateFactory.newCameraPosition(myPosition));

最佳答案

请检查Google Maps Android API v2的示例代码。使用此方法可以解决您的问题。

private void setUpMapIfNeeded() {
    // Do a null check to confirm that we have not already instantiated the map.
    if (mMap == null) {
        // Try to obtain the map from the SupportMapFragment.
        mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
        mMap.setMyLocationEnabled(true);
        // Check if we were successful in obtaining the map.
        if (mMap != null) {
            mMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() {
                @Override
                public void onMyLocationChange(Location arg0) {
                    mMap.addMarker(new MarkerOptions().position(new LatLng(arg0.getLatitude(), arg0.getLongitude())).title("It's Me!"));
                }
            });
        }
    }
}

在onCreate函数中调用此函数。