/**
 * name为football的类别
 */
private void equal() {
    BmobQuery<Category> categoryBmobQuery = new BmobQuery<>();
    categoryBmobQuery.addWhereEqualTo("name", "football");
    categoryBmobQuery.findObjects(new FindListener<Category>() {
        @Override
        public void done(List<Category> object, BmobException e) {
            if (e == null) {
                Snackbar.make(mBtnEqual, "查询成功：" + object.size(), Snackbar.LENGTH_LONG).show();
            } else {
                Log.e("BMOB", e.toString());
                Snackbar.make(mBtnEqual, e.getMessage(), Snackbar.LENGTH_LONG).show();
            }
        }
    });
}