Android 给GridView添加分割线

谁践踏了优雅 2022-06-08 01:58 339阅读 0赞

GridView添加分割线，只要重写dispatchDraw方法来进行绘制；

首先看一下效果图

![Center][]

代码如下：

public class LineGridVIew extends GridView{
        public LineGridVIew(Context context) {
            super(context);
            // TODO Auto-generated constructor stub
        }
        public LineGridVIew(Context context, AttributeSet attrs) {
            super(context, attrs);
        }
        public LineGridVIew(Context context, AttributeSet attrs, int defStyle) {
            super(context, attrs, defStyle);
        }
        @Override
        protected void dispatchDraw(Canvas canvas){
            super.dispatchDraw(canvas);
            View localView1 = getChildAt(0);
            int column = getWidth() / localView1.getWidth();
            int childCount = getChildCount();
            Paint localPaint;
            localPaint = new Paint();
            localPaint.setStyle(Paint.Style.STROKE);
            localPaint.setColor(getContext().getResources().getColor(R.color.grey));
            for(int i = 0;i < childCount;i++){
                View cellView = getChildAt(i);
                if((i + 1) % column == 0){
                    canvas.drawLine(cellView.getLeft(), cellView.getBottom(), cellView.getRight(), cellView.getBottom(), localPaint);
                }else if((i + 1) > (childCount - (childCount % column))){
                    canvas.drawLine(cellView.getRight(), cellView.getTop(), cellView.getRight(), cellView.getBottom(), localPaint);
                }else{
                    canvas.drawLine(cellView.getRight(), cellView.getTop(), cellView.getRight(), cellView.getBottom(), localPaint);
                    canvas.drawLine(cellView.getLeft(), cellView.getBottom(), cellView.getRight(), cellView.getBottom(), localPaint);
                }
            }
            if(childCount % column != 0){
                for(int j = 0 ;j < (column-childCount % column) ; j++){
                    View lastView = getChildAt(childCount - 1);
                    canvas.drawLine(lastView.getRight() + lastView.getWidth() * j, lastView.getTop(), lastView.getRight() + lastView.getWidth()* j, lastView.getBottom(), localPaint);
                }
            }
        }

[Center]: /images/20220608/ffcb96921dc5456cb165aa7c5b17399d.png