在 Android ListView 或 RecyclerView 中圆角

你可以使用自定义的 ItemDecoration 来实现在 Android ListView 或 RecyclerView 中圆角。

下面是一个示例代码，演示如何在 RecyclerView 中应用圆角：

public class RoundedCornerItemDecoration extends RecyclerView.ItemDecoration {
    private final int radius;

    public RoundedCornerItemDecoration(int radius) {
        this.radius = radius;
    }

    @Override
    public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
        super.getItemOffsets(outRect, view, parent, state);
        outRect.left = radius;
        outRect.right = radius;
        outRect.top = radius;
        outRect.bottom = radius;
    }

    @Override
    public void onDraw(@NonNull Canvas canvas, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
        super.onDraw(canvas, parent, state);
        Paint paint = new Paint();
        paint.setColor(Color.WHITE);
        paint.setAntiAlias(true);
        for (int i = 0; i < parent.getChildCount(); i++) {
            View child = parent.getChildAt(i);
            canvas.drawRoundRect(new RectF(child.getLeft(), child.getTop(), child.getRight(), child.getBottom()), radius, radius, paint);
        }
    }
}

在 RecyclerView 中应用这个 ItemDecoration：

recyclerView.addItemDecoration(new RoundedCornerItemDecoration(16));

这个示例代码中，我们使用了一个自定义的 ItemDecoration，将 RecyclerView 的每个 item 都应用了圆角。你可以根据需要调整圆角的半径。