在 RecyclerView 中为分隔线添加边距 [英] Add margins to divider in RecyclerView

问题描述

我正在构建一个使用 RecyclerView 的 android 应用程序.我想在 RecyclerView 中添加分隔符，这是我使用以下代码完成的:

i am building an android app which is using RecyclerView. I want to add dividers to RecyclerView, which I did using this code:

DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(), linearLayoutManager.getOrientation());
recyclerView.addItemDecoration(dividerItemDecoration);

到目前为止一切正常.但是，分隔符占用了全屏的大小，我想为其添加边距.有什么方法可以使用一种方法来为分隔线添加边距，该方法将为绘制的矩形添加一些空间，而不是通过创建带有边距的自定义可绘制形状并将其添加到 RecyclerView 中?>

So far everything works fine. However, the divider is taking the size of full screen and I want to add margins to it. Is there any way that I can add margins to the divider using a method that will add some space to the rectangle drawn and not by creating a custom drawable shape with margins and add it to the RecyclerView?

推荐答案

使用它并根据您的要求进行自定义.

Use this and customize according to your requirement.

public class DividerItemDecoration extends RecyclerView.ItemDecoration {

    private static final int[] ATTRS = new int[]{android.R.attr.listDivider};

    private Drawable divider;

    /**
     * Default divider will be used
     */
    public DividerItemDecoration(Context context) {
        final TypedArray styledAttributes = context.obtainStyledAttributes(ATTRS);
        divider = styledAttributes.getDrawable(0);
        styledAttributes.recycle();
    }

    /**
     * Custom divider will be used
     */
    public DividerItemDecoration(Context context, int resId) {
        divider = ContextCompat.getDrawable(context, resId);
    }

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

        int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            View child = parent.getChildAt(i);

            RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();

            int top = child.getBottom() + params.bottomMargin;
            int bottom = top + divider.getIntrinsicHeight();

            divider.setBounds(left, top, right, bottom);
            divider.draw(c);
        }
    }
}

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