ItemDecoration自定义宽度和颜色

/**
 * 垂直布局分割线绘制
 * @param c
 * @param parent
 */
private void drawVertical(Canvas c,RecyclerView parent){
    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);
        final RecyclerView.LayoutParams params= (RecyclerView.LayoutParams) child.getLayoutParams();
        final int top=child.getBottom()+params.bottomMargin+Math.round(ViewCompat.getTranslationZ(child));
        final int bottom=top+drawable.getIntrinsicHeight();
        drawable.setBounds(left,top+2,right,bottom);//宽度调节
        drawable.setColorFilter(context.getResources().getColor(R.color.colorAccent), PorterDuff.Mode.XOR);//Mode选择不对无法正常显示选择的颜色
        drawable.draw(c);


如代码所示，宽度其实就是控制top和bottom的距离，加减就可以了，很简单。
颜色就是drawable设置setColorFilter设置颜色和Mode，注意有的Mode颜色显示不正常