RecyclerView 数据刷新的几种方式局部刷新 notify MD

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发布时间：2019-06-23

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RecyclerView 数据刷新的几种方式局部刷新 notify MD

小结

刷新全部可见的item，notifyDataSetChanged()

刷新指定item，notifyItemChanged(int)

从指定位置开始刷新指定个item，notifyItemRangeChanged(int,int)

插入、移动一个并自动刷新，notifyItemInserted(int)、notifyItemMoved(int)、notifyItemRemoved(int)

局部刷新，notifyItemChanged(int, Object)

Activity

public class Notify_Activity extends Activity implements MyOnItemClickLitener {    private RecyclerView mRecyclerView;    private Notify_Adapter mAdapter;    private ArrayList
     
       beans;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ((SwipeRefreshLayout) findViewById(R.id.swipeLayout)).setEnabled(false);        mRecyclerView = (RecyclerView) findViewById(R.id.rv);        initList();        initView();    }    protected void initView() {        mAdapter = new Notify_Adapter(this, beans);        mAdapter.setOnItemClickLitener(this);        mRecyclerView.setAdapter(mAdapter);//设置adapter        mRecyclerView.setLayoutManager(new GridLayoutManager(this, 3));//设置布局管理器        mRecyclerView.setItemAnimator(new DefaultItemAnimator());//设置Item增加、移除动画        mRecyclerView.addItemDecoration(new GridItemDecoration.Builder().spanCount(3)                .spaceSize(1).mDivider(new ColorDrawable(0x88ff0000)).build());    }    private void initList() {        beans = PicUrls.getPicList(PicUrls.BIG_BEANS_2);        beans.get(0).name = "刷新当前，notifyItemChanged(int)";        beans.get(1).name = "全部刷新，notifyDataSetChanged()";        beans.get(2).name = "从此位置开始刷新2个，notifyItemRangeChanged";        beans.get(3).name = "插入一个并自动刷新，notifyItemInserted";        beans.get(4).name = "只更改数据源，这样当然不会刷新UI";        beans.get(5).name = "插入一个并刷新当前，notifyItemChanged";        beans.get(6).name = "局部刷新，tv";        beans.get(7).name = "局部刷新，et";        beans.get(8).name = "局部刷新，iv";    }    @Override    public void onItemClick(View view, int position) {        Toast.makeText(this, position + " 被点击了", Toast.LENGTH_SHORT).show();        reInit(position);    }    @Override    public void onItemLongClick(View view, int position) {        Toast.makeText(this, position + "被长按了", Toast.LENGTH_SHORT).show();    }    private void reInit(int position) {        switch (position) {            default:                mAdapter.notifyItemChanged(position);//刷新指定一个。一定会闪                break;            case 1:                mAdapter.notifyDataSetChanged();//全部刷新。基本不会闪，刚开始个别可能会闪                break;            case 2:                mAdapter.notifyItemRangeChanged(position, 2);//从指定位置开始刷新指定个。一定会闪                break;            case 3:                beans.add(position, new PicUrls.BasicPicBean("http://img.mmjpg.com/2015/74/1.jpg", "新插入的图片1", 1));                mAdapter.notifyItemInserted(position);//插入一个并刷新，正常                break;            case 4://只更改数据源，这样当然不会刷新UI                beans.add(position, new PicUrls.BasicPicBean("http://img.mmjpg.com/2015/74/2.jpg", "新插入的图片2", 2));                break;            case 5://                beans.add(position, new PicUrls.BasicPicBean("http://img.mmjpg.com/2015/74/3.jpg", "新插入的图片3", 3));                mAdapter.notifyItemChanged(position);//这样只会导致当前item刷新，而不会刷新其他item，当然是不行的                break;            case 6:                beans.set(position, beans.get(new Random().nextInt(beans.size())));                mAdapter.notifyItemChanged(position, Notify_Adapter.NOTIFY_TV);//局部刷新                break;            case 7:                beans.set(position, beans.get(new Random().nextInt(beans.size())));                mAdapter.notifyItemChanged(position, Notify_Adapter.NOTIFY_ET);//局部刷新                break;            case 8:                beans.set(position, beans.get(new Random().nextInt(beans.size())));                mAdapter.notifyItemChanged(position, Notify_Adapter.NOTIFY_IV);//局部刷新                break;        }    }}

Adapter

public class Notify_Adapter extends RecyclerView.Adapter
     
       {    private Context context;    private List
      
        mDatas;    private MyOnItemClickLitener mOnItemClickLitener;    public static final int NOTIFY_TV = 10086;    public static final int NOTIFY_ET = 10087;    public static final int NOTIFY_IV = 10088;    public Notify_Adapter(Context context, List
       
         mDatas) {        this.context = context;        this.mDatas = mDatas;    }    @Override    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        return new MyViewHolder(LayoutInflater.from(context).inflate(R.layout.item_notify, parent, false));    }    @Override    public void onBindViewHolder(MyViewHolder holder, int position) {        //不使用    }    @Override    public void onBindViewHolder(final MyViewHolder holder, int position, List payloads) {        //payloads是从notifyItemChanged(int, Object)中，或从notifyItemRangeChanged(int, int, Object)中传进来的Object集合        //如果payloads不为空并且viewHolder已经绑定了旧数据了，那么adapter会使用payloads参数进行布局刷新        //如果payloads为空，adapter就会重新绑定数据，也就是刷新整个item        PicUrls.BasicPicBean bean = mDatas.get(holder.getAdapterPosition());        long time = System.currentTimeMillis() + bean.url.hashCode();        String data = new SimpleDateFormat("HH:mm:ss", Locale.getDefault()).format(new Date(time));        if (payloads.isEmpty()) {//为空，即不是调用notifyItemChanged(position,payloads)后执行的，也即在初始化时执行的            holder.tv.setText(data);            holder.et.setText(bean.name);            Glide.with(context).load(bean.url)                    .dontAnimate()                    //.diskCacheStrategy(DiskCacheStrategy.NONE).skipMemoryCache(true)                    .into(holder.iv);        } else if (payloads.size() > 0 && payloads.get(0) instanceof Integer) {            //不为空，即调用notifyItemChanged(position,payloads)后执行的，可以在这里获取payloads中的数据进行局部刷新            int type = (int) payloads.get(0);// 刷新哪个部分 标志位            switch (type) {                case NOTIFY_TV:                    holder.tv.setText(data);//只刷新tv                    break;                case NOTIFY_ET:                    holder.et.setText(bean.name);//只刷新et                    break;                case NOTIFY_IV:                    Glide.with(context).load(bean.url).dontAnimate().into(holder.iv);//只刷新iv                    break;            }        }        // 如果设置了回调，则设置点击事件        holder.itemView.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                if (mOnItemClickLitener != null) mOnItemClickLitener.onItemClick(holder.itemView, holder.getAdapterPosition());            }        });        holder.itemView.setOnLongClickListener(new OnLongClickListener() {            @Override            public boolean onLongClick(View v) {                if (mOnItemClickLitener != null) mOnItemClickLitener.onItemLongClick(holder.itemView, holder.getAdapterPosition());                return false;            }        });    }    @Override    public int getItemCount() {        return mDatas.size();    }    /**     * 添加并更新数据，同时具有动画效果     */    public void addDataAt(int position, PicUrls.BasicPicBean data) {        mDatas.add(position, data);        notifyItemInserted(position);//更新数据集，注意如果用adapter.notifyDataSetChanged()将没有动画效果    }    /**     * 移除并更新数据，同时具有动画效果     */    public void removeDataAt(int position) {        mDatas.remove(position);        notifyItemRemoved(position);    }    public void setOnItemClickLitener(MyOnItemClickLitener mOnItemClickLitener) {        this.mOnItemClickLitener = mOnItemClickLitener;    }    class MyViewHolder extends RecyclerView.ViewHolder {        TextView tv;        ImageView iv;        EditText et;        public MyViewHolder(View view) {            super(view);            tv = (TextView) view.findViewById(R.id.tv_name);            iv = (ImageView) view.findViewById(R.id.iv_head);            et = (EditText) view.findViewById(R.id.et_input);        }    }}

布局

获取图片集合

public class PicUrls {    private static final String HOST0 = "http://img1.mm131.com/pic/";//网站【http://www.mm131.com/】    private static final String HOST1 = "http://img.mmjpg.com/";//网站【http://www.mmjpg.com/】    private static final String HOST2 = "http://pic.meituba.com/uploads/allimg/";//网站【http://www.meituba.com/】    public static final UrlBean BIG_BEANS_0 = new UrlBean.Builder()//http://pic.meituba.com/uploads/allimg/2015/10/23/220.jpg            .host(HOST2).urlHeader("2015/10/23/").picIndexFrom(220).picCount(100).picDes("100张动漫卡通壁纸").build();    public static final UrlBean BIG_BEANS_1 = new UrlBean.Builder()//http://pic.meituba.com/uploads/allimg/2017/03/27/121_5600.jpg            .host(HOST2).urlHeader("2017/03/27/121_").picIndexFrom(5600).picCount(100).picDes("100张搞笑内涵图片").build();    public static final UrlBean BIG_BEANS_2 = new UrlBean.Builder()//http://pic.meituba.com/uploads/allimg/2015/10/23/360.jpg            .host(HOST2).urlHeader("2015/10/23/").picIndexFrom(360).picCount(750).picDes("750张性感美女图").build();    public static final UrlBean BIG_BEANS_3 = new UrlBean.Builder()//http://pic.meituba.com/uploads/allimg/2016/03/25/43_20335.jpg            .host(HOST2).urlHeader("2016/03/25/43_").picIndexFrom(20335).picCount(1400).picDes("1400张动漫卡通壁纸").build();    private static final UrlBean[] simpleBeans = {            //http://img1.mm131.com/pic/996/1.jpg            new UrlBean.Builder().host(HOST0).urlHeader("996/").picCount(10).picDes("北影校花余雨高清写真图片").build(),            new UrlBean.Builder().host(HOST0).urlHeader("2958/").picCount(10).picDes("童颜嫩妹桃子黑丝大尺度诱惑").build(),            new UrlBean.Builder().host(HOST0).urlHeader("2939/").picCount(10).picDes("清纯少女刘奕宁酥胸覆白色内衣").build(),            new UrlBean.Builder().host(HOST0).urlHeader("2343/").picCount(10).picDes("萌妹销魂写真身材惹火让人欲罢不能").build(),            new UrlBean.Builder().host(HOST0).urlHeader("2935/").picCount(10).picDes("性感女神杨晨晨透视睡衣大胆秀乳").build(),            //http://img.mmjpg.com/2015/444/1.jpg            new UrlBean.Builder().host(HOST1).urlHeader("2015/444/").picCount(10).picDes("模范学院美少女柳侑绮制服大片").build(),            new UrlBean.Builder().host(HOST1).urlHeader("2015/74/").picCount(10).picDes("极品女神可儿私拍秀完美身材").build(),            new UrlBean.Builder().host(HOST1).urlHeader("2017/990/").picCount(10).picDes("香艳妹子雪白的美胸绝对让你大饱眼福").build(),            new UrlBean.Builder().host(HOST1).urlHeader("2017/962/").picCount(10).picDes("真诱人啊!女神雪白的美胸看着很有感觉").build(),            new UrlBean.Builder().host(HOST1).urlHeader("2017/936/").picCount(10).picDes("身材娇美纯天然美女小叶子美胸艺术照").build(),            //http://pic.meituba.com/uploads/allimg/2015/10/23/247.jpg            new UrlBean.Builder().host(HOST2).urlHeader("2015/10/23/").picIndexFrom(247).picCount(10).picDes("呆萌可爱的哆啦A梦动漫").build(),            new UrlBean.Builder().host(HOST2).urlHeader("2016/03/25/43_").picIndexFrom(20574).picCount(10).picDes("海贼王红发香克斯").build(),

2017-6-7

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