RelativeLayout 代码控制居中

相对布局视图居中，代码控制ProgressBar progressBar = new ProgressBar(mContext);RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(100, 100);// 这里改成DP值layoutParams.addRule(RelativeLayout.CENTER_IN_PARENT);((ViewGroup) mContainView).addView(progressBar, 0, layoutParams);