code: public void setContentView(int resId) {
          if (mCurrentLayoutId != resId) {
              View view = inflate(mContext, resId, null);
              if (mDefaultContentView == null &&
                  resId == mCallback.getContentViewDefaultLayoutId(this)) {
                  mDefaultContentView = view;
                  mDefaultLayoutId = resId;
              }
              mCurrentLayoutId = resId;
              setContentView(view);
          }
      }
docs: Set contentView.
  
  @param resId