recyclerView批量删除+动画很简单的一个demo

        这几天面试，面试官问了我一个recyclerView删除动画你会吗。

这玩意不是recyclerView里面系统带的吗。然后问我如果是批量删除呢？你做过吗？好蒙蔽，当时可能是紧张吧，因为刚开始使用recyclerView（菜鸟的世界，大神不懂）。

        回来后赶紧查资料，mmp为什么网上都是批量删除，没有动画。还是自己动手丰衣足食吧

        

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        delete = (Button) findViewById(R.id.delete);
        recyclerview = (RecyclerView) findViewById(R.id.recyclerview);
        edit = (Button) findViewById(R.id.edit);
        arrayList = new ArrayList<>();
        deleteArrayList = new ArrayList<>();
        initData();
    }

    private void initData() {
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        SimpleDividerItemDecoration simpleDividerItemDecoration = new SimpleDividerItemDecoration();
        //设置recyclerview线性布局管理器
        recyclerview.setLayoutManager(linearLayoutManager);
        //设置条目中间分割线（默认）
        recyclerview.addItemDecoration(simpleDividerItemDecoration);
        //设置默认系统动画
        recyclerview.setItemAnimator(new DefaultItemAnimator());
        //模拟数据
        for (int i = 0; i < 30; i++) {
            isChoose = new IsChoose();
            isChoose.setContent("第" + i + "条数据");
            arrayList.add(isChoose);

        }
        myRecyclerviewAdapter = new MyRecyclerviewAdapter(this, arrayList);
        recyclerview.setAdapter(myRecyclerviewAdapter);
        delete.setOnClickListener(this);
        edit.setOnClickListener(this);
        myRecyclerviewAdapter.setItemClickListener(new MyRecyclerviewAdapter.OnItemClickListener() {

            private IsChoose e;

            @Override
            public void onItemClick(int position) {
                //判断是否显示选择筐
                if (iSSHOW == 1) {
                    //获取当前条目然后设置是否为选中，这里没有直接用boolean值判断
                    e = arrayList.get(position);
                    if (e.getSelect() == 0) {
                        e.setSelect(1);
                    } else {
                        e.setSelect(0);
                    }
                    deleteArrayList.add(e);
                    myRecyclerviewAdapter.notifyDataSetChanged();
                } else {
                    Toast.makeText(MainActivity.this, "当前是第" + position + "个条目", Toast.LENGTH_SHORT).show();
                }
            }
        });

    }

    private int iSSHOW = GONECHECK;
    private static final int GONECHECK = 0;
    private static final int SHOWCHECK = 1;

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.edit:
                iSSHOW = iSSHOW == GONECHECK ? SHOWCHECK : GONECHECK;
                myRecyclerviewAdapter.setMode(iSSHOW);
                break;
            case R.id.delete:
                for (int i = 0; i < deleteArrayList.size(); i++) {
                    myRecyclerviewAdapter.remove(deleteArrayList.get(i));
                }

                break;
        }
    }

MainActivity没什么好说的，就是数据然后recyclerView适配和点击 接下来布局也很简单

主页面布局

item布局

适配器

public class MyRecyclerviewAdapter extends RecyclerView.Adapter implements View.OnClickListener {

    private final Context MyContext;
    private final ArrayList MyarrayList;
    private MyViewHolder holder;
    private int VISIBLE = 0;
    private int ISCHOOSE = 0;
    private int isshow = 0;
    private IsChoose isChoose;
    private int isSelect;

    public MyRecyclerviewAdapter(Context context, ArrayList arrayList) {
        this.MyContext = context;
        this.MyarrayList = arrayList;
    }

    @Override
    public int getItemCount() {
        return MyarrayList.size();
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View inflate = LayoutInflater.from(MyContext).inflate(R.layout.item_my_live, null, true);
        holder = new MyViewHolder(inflate);
        holder.mCheckBox.setVisibility(View.GONE);
        //给每条布局设置点击事件  也可以用其他方式
        inflate.setOnClickListener(this);
        return holder;
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, final int position) {
        isChoose = MyarrayList.get(position);
        holder.mTvSource.setText(isChoose.getContent());
        holder.itemView.setTag(position);
        if (isshow == VISIBLE) {
            holder.mCheckBox.setVisibility(View.GONE);
        } else {
            holder.mCheckBox.setVisibility(View.VISIBLE);
            isSelect = isChoose.isSelect;
            if (isSelect != ISCHOOSE) {
                holder.mCheckBox.setImageResource(R.mipmap.ic_checked);
            } else {
                holder.mCheckBox.setImageResource(R.mipmap.ic_uncheck);
            }
        }
    }

    @Override
    public void onClick(View v) {
        if (mItemClickListener != null) {
            mItemClickListener.onItemClick((Integer) v.getTag());
        }
    }

    public OnItemClickListener mItemClickListener;

    /**
     *是否显示选择筐
     */
    public void setMode(int isshow) {
        this.isshow = isshow;
        notifyDataSetChanged();
    }

    public void remove(IsChoose deleteItem) {
        for (int i = 0; i < MyarrayList.size(); i++) {
            if (MyarrayList.contains(deleteItem)) {
                int i1 = MyarrayList.indexOf(deleteItem);
                MyarrayList.remove(deleteItem);
                notifyItemRemoved(i1);
            }
        }
    }

    public interface OnItemClickListener {
        void onItemClick(int position);
    }

    public void setItemClickListener(OnItemClickListener itemClickListener) {
        mItemClickListener = itemClickListener;
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {

        private final ImageView mCheckBox;
        private final TextView mTvSource;

        public MyViewHolder(View itemView) {
            super(itemView);
            mCheckBox = itemView.findViewById(R.id.check_box);
            mTvSource = itemView.findViewById(R.id.tv_source);
        }
    }

}

注释差不多都写完了，就是利用recyclerView的适配器中notifyItemRemoved方法做一个循环遍历

我暂时没有想到更好的办法来实现这个批量动画删除。如果哪位大神有更好的办法。欢迎指教！

下载地址

https://download.csdn.net/download/bai936780514/10402234