abstract class BaseActivity <T extends ViewBinding> extends AppCompatActivity {

    public T binding;

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //返回当前类的父类的Type，也就是BaseActivity
        Type type = this.getClass().getGenericSuperclass();
        if (type instanceof ParameterizedType) {
            //如果支持泛型
            try {
                //获得泛型中的实际类型，可能会存在多个泛型，[0]也就是获得T的type
                Class<T> clazz = (Class<T>) ((ParameterizedType) type).getActualTypeArguments()[0];
                //反射inflate
                Method method = clazz.getMethod("inflate", LayoutInflater.class);
                //方法调用，获得ViewBinding实例
                binding = (T) method.invoke(null, getLayoutInflater());
            }  catch (Exception e) {
                e.printStackTrace();
            }
            setContentView(binding.getRoot());
        }
        init();
    }
    abstract void init();
}

public class MainActivity extends BaseActivity<ActivityMainBinding> {
    @Override
    void init() {
        binding.tvHello.setText("binding get");
    }
}

abstract class BaseFragment<T extends ViewBinding> extends Fragment {

    public T binding;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        Type type = this.getClass().getGenericSuperclass();
        if (type instanceof ParameterizedType) {
            try {
                Class<T> clazz = (Class<T>) ((ParameterizedType) type).getActualTypeArguments()[0];
                Method method = clazz.getMethod("inflate", LayoutInflater.class, ViewGroup.class, Boolean.class);
                binding = (T) method.invoke(null, container, false);
            }  catch (Exception e) {
                e.printStackTrace();
            }
        }
        return binding.getRoot();
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        init();
    }

    abstract void init();

}