Just use the Layout where the container is located as the view, for example:

public class SnackbarTestActivity extends Activity {

CoordinatorLayout container;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_snackbar_test);
    container = (CoordinatorLayout) findViewById(R.id.container);
}

public void createSnackbar(View v) {
    Snackbar.make(container, "SnackbarTest", Snackbar.LENGTH_LONG).show();
}
}