Intent intent = new Intent();
    intent.setType("image/*");
    intent.setAction(Intent.ACTION_GET_CONTENT);
    startActivityForResult(Intent.createChooser(intent,"Select Picture"), PICK_IMAGE_REQUEST);



    FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();

    UserProfileChangeRequest profileUpdates = new UserProfileChangeRequest.Builder()
            .setPhotoUri(Uri.parse(""))//Falta la eleccion de la foto
            .build();

    user.updateProfile(profileUpdates)
            .addOnCompleteListener(new OnCompleteListener<Void>() {
                @Override
                public void onComplete(@NonNull Task<Void> task) {
                    if (task.isSuccessful()) {

                    }
                }
            });
}