安卓APP_android_params.gravity无法解析gravity

导入如下信息

import android.widget.FrameLayout;
import android.widget.FrameLayout.LayoutParams;

 

 

LayoutParams params = new LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT); // 创建保存布局参数的对象
params.gravity = Gravity.CENTER_HORIZONTAL | Gravity.CENTER_VERTICAL;