RecyclerView顶部添加padding的方法

最新推荐文章于 2024-12-23 11:37:15 发布

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最新推荐文章于 2024-12-23 11:37:15 发布

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文章标签：移动开发 java

原文链接：https://juejin.im/post/5aa23ec5f265da239a5f6617

遇到的情况：

RecyclerView和RecyclerView上面的部件需要保持一点距离，但是给RecyclerView设置padding后发现item滚动时，padding部分不随之一起滚动。

目前想到的有三种

1.禁用RecyclerView滚动，再嵌套一个NestedScrollView（未测试）

2.给RecyclerView设置头部（测试可以，需要在合适的时机添加比较美观）

3.利用addItemDecoration（）方法，添加分割线。（建议该方法）


import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.support.v7.widget.RecyclerView;
import android.view.View;


/**
 * Created by leiel on 2018/3/9 0009.
 */

public class SimpleDividerDecoration extends RecyclerView.ItemDecoration {
    private int dividerHeight;
    private Paint dividerPaint;

    public SimpleDividerDecoration(Context context) {
        dividerPaint = new Paint();
        dividerPaint.setColor(context.getResources().getColor(R.color.bg_gray));
        dividerHeight = context.getResources().getDimensionPixelSize(R.dimen.m1);
    }

    private int isF = 1;

    @Override
    public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
        int childCount = parent.getChildCount();
        int left = parent.getPaddingLeft();
        int right = parent.getWidth() - parent.getPaddingRight();

        for (int i = 0; i < childCount - 1; i++) {
            View view = parent.getChildAt(i);
            float top = view.getTop();
            float bottom = view.getTop() + dividerHeight;
            if (i == 0) {
                if (isF == 1) {
                    view.setPadding(view.getPaddingLeft(), view.getPaddingTop() + 10,
                            view.getPaddingRight(), view.getPaddingBottom());
                    isF = 0;
                }
                c.drawRect(left, top, right, bottom + 10, dividerPaint);
            } else
                c.drawRect(left, top, right, bottom, dividerPaint);
        }


    }


}

复制代码

参考链接：https://www.jianshu.com/p/b46a4ff7c10a(翻译)

转载于:https://juejin.im/post/5aa23ec5f265da239a5f6617