在Android專案開發中，有時候需要帶分割線的GridView，一般情況下是做類似九宮格的功能。有時候可以直接留出邊距就可以，底部背景就可以當做分割線了。但要是設計比較刁，非得要分割線跟背景顏色不同呢，那就用LineGridView吧。

public class LineGridView extends GridView {
    public LineGridView(Context context) {
        super(context);
    }

    public LineGridView(Context context, AttributeSet attrs) {
        super
 
(context, attrs);
    }

    public LineGridView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2
 
, MeasureSpec.AT_MOST);
        super.onMeasure(widthMeasureSpec, expandSpec);
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        super.dispatchDraw(canvas);
        View localView1 = getChildAt(0);
        int column = getWidth() / localView1.getWidth();//列數
        int childCount = getChildCount();
        Paint localPaint;
        localPaint = new
 
 Paint();
        localPaint.setStyle(Paint.Style.STROKE);
        localPaint.setColor(getContext().getResources().getColor(R.color.ddcx_color_grey2));//這個就是設定分割線的顏色
        for (int i = 0; i < childCount; i++) {
            View cellView = getChildAt(i);
            if ((i + 1) % column == 0) {//每一行最後一個
                canvas.drawLine(cellView.getLeft(), cellView.getBottom(), cellView.getRight(), cellView.getBottom(), localPaint);
            } else if ((i + 1) > (childCount - (childCount % column))) {//最後一行的item
                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);
            }
        }
    }
}

用法也很簡單，你用GridView的地方替換為LineGridView，再把分割線顏色設定下就好了。