code: public void setContentPadding(int left, int top, int right, int bottom) {
          mContentPadding.set(left, top, right, bottom);
          IMPL.updatePadding(this);
      }
docs: Sets the padding between the Card's edges and the children of CardView.
  <p>
  Depending on platform version or {@link #getUseCompatPadding()} settings, CardView may
  update these values before calling {@link android.view.View#setPadding(int, int, int, int)}.
  
  @param left   The left padding in pixels
  @param top    The top padding in pixels
  @param right  The right padding in pixels
  @param bottom The bottom padding in pixels
  @attr ref android.support.v7.cardview.R.styleable#CardView_contentPadding
  @attr ref android.support.v7.cardview.R.styleable#CardView_contentPaddingLeft
  @attr ref android.support.v7.cardview.R.styleable#CardView_contentPaddingTop
  @attr ref android.support.v7.cardview.R.styleable#CardView_contentPaddingRight
  @attr ref android.support.v7.cardview.R.styleable#CardView_contentPaddingBottom