DividerItemDecoration.java 文件源码

@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
    final int left = parent.getPaddingLeft();
    final int right = parent.getWidth() - parent.getPaddingRight();
    final int childCount = parent.getChildCount();
    for(int i = 0;i < childCount;i ++){
        final View child = parent.getChildAt(i);
        RecyclerView view = new RecyclerView(parent.getContext());
        final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
        final int top = child.getBottom() + params.bottomMargin;
        final int bottom = top + mDivider.getIntrinsicHeight();
        mDivider.setBounds(left,top,right,bottom);
        mDivider.draw(c);
    }
}