Android侧滑列表组件

前言

其实就是一个横向的RecyclerView，记录一下其他的几个点，整体比较简单

实现

Java代码如下：

/**
 * 侧滑列表
 */
public class HomeSideSlipView extends LinearLayout {
    /**
     * 上下圆角样式的判断
     */
    public static final int LIST_TYPE_BG = 1;
    public static final int ACT_TYPE_BG = 2;

    private LinearLayout ll_all;
    private Context mContext;
    private RecyclerView rv;
    private int position;
    private int xOffset;

    public HomeSideSlipView(Context context) {
        super(context);
        initView(context);
    }

    public HomeSideSlipView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        initView(context);
    }

    private void initView(Context context) {
        mContext = context;
        View view = LayoutInflater.from(mContext)
                          .inflate(R.layout.home_side_slide_view,this,true);
        ll_all = view.findViewById(R.id.ll_all);
        rv = view.findViewById(R.id.rv);
    }

    public void setType(int type){
        ll_all.setBackgroundResource(type == LIST_TYPE_BG ? R.drawable.shape_white_bg10 : R.drawable.shape_white_bottom_r10);
    }

    public void setData(List<HomeGoodsInfoBean> mList, int type){
        rv.setLayoutManager(new LinearLayoutManager(mContext,LinearLayoutManager.HORIZONTAL,false));
        HomeSideAdapter adapter = new HomeSideAdapter(mList,type);
        rv.setAdapter(adapter);
    }

    /**
     * 保持状态
     */
    @Override
    protected void onDetachedFromWindow() {
        LinearLayoutManager manager = (LinearLayoutManager) rv.getLayoutManager();
        if(manager!=null){
            position = manager.findFirstVisibleItemPosition();
            View view = manager.findViewByPosition(position);
            if(view != null){
                ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) view.getLayoutParams();
                xOffset = view.getLeft() - lp.leftMargin; //设置了margin则减去
            }

        }
        super.onDetachedFromWindow();
    }

    /**
     * 恢复状态
     */
    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        if(rv!=null){
            LinearLayoutManager manager = (LinearLayoutManager) rv.getLayoutManager();
            if(manager != null) manager.scrollToPositionWithOffset(position, xOffset);
        }
    }
}

假如这个侧滑列表是一个RecyclerView列表中的一个item时，需要注意onDetachedFromWindow()方法中保存侧滑列表的滑动位置，并在onAttachedToWindow()方法中恢复滑动位置。