RecyclerView实现全选、置顶、拖拽功能

今天给大家分享是如何在RecyclerView实现全选，ItemTouchHelper实现侧滑删除,拖拽功能。比较基础。关于RecyclerView的强大，就不多说了。

效果：

RecyclerView实现全选，ItemTouchHelper实现侧滑删除,拖拽功能

使用RecyclerView，首先我们需要依赖

    compile 'com.android.support:recyclerview-v7:23.+'

项目结构:

项目结构

主要是把选择的存储在HashMap记录下来，通知用eventbus发送。

下面我们一步一步来实现这种效果.

1、我们新建一个MainActivity 布局

public class MainActivity extends Activity {
    private RecyclerView recyclerView;
    private CheckBox checkbox;
    private TextView selected;
    private ListAdapter adapter;
    private EventBus event;
    private boolean isChange = false;
    private ArrayList list = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        initData();
    }

    private void initView() {
        event = EventBus.getDefault();
        event.register(this);
        recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
        checkbox = (CheckBox) findViewById(R.id.checkbox);
        selected = (TextView) findViewById(R.id.selected);
    }

    private void initData() {
        for (int i = 0; i < 20; i++) {
            Book model = new Book();
            model.setId(i);
            model.setName("商品" + i);
            model.setDesc("描述" + i);
            list.add(model);
        }
        adapter = new ListAdapter(list, event);
        recyclerView.setHasFixedSize(true);
        recyclerView.setAdapter(adapter);
        recyclerView.setLayoutManager(new GridLayoutManager(this, 3));
        checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                try {
                    HashMap map = new HashMap();
                    int count = 0;
                    if (isChecked) {
                        isChange = false;
                    }
                    for (int i = 0, p = list.size(); i < p; i++) {
                        if (isChecked) {
                            map.put(i, true);
                            count++;
                        } else {
                            if (!isChange) {
                                map.put(i, false);
                                count = 0;
                            } else {
                                map = adapter.getMap();
                                count = map.size();
                            }
                        }
                    }
                    selected.setText("已选" + count + "项");
                    adapter.setMap(map);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });

        adapter.setOnItemClickListener(new ListAdapter.ItemClickListener() {
            @Override
            public void onItemClick(RecyclerView.ViewHolder holder, int positon) {
                Log.e("onItemClick", "" + positon);
            }

            @Override
            public void onItemLongClick(final RecyclerView.ViewHolder holder, final int positon) {
                Log.e("onItemLongClick", "" + positon);
            }
        });
    }

    public void onEventMainThread(SelectEvent event) {
        int size = event.getSize();
        if (size < list.size()) {
            isChange = true;
            checkbox.setChecked(false);
        } else {
            checkbox.setChecked(true);
            isChange = false;
        }
        selected.setText("已选" + size + "项");
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();
        event.unregister(this);
    }
}

2、我们建一个ListAdapter适配器

public class ListAdapter extends RecyclerView.Adapter {

    private List mItems;
    private List selected;
    public HashMap map;
    private EventBus eventBus;

    public ListAdapter(List mItems, EventBus eventBus) {
        this.mItems = mItems;
        this.eventBus = eventBus;
        map = new HashMap<>();
        selected = new ArrayList<>();
        init();
    }

    private void init() {
        if (null == mItems || mItems.size() <= 0) {
            return;
        }
        for (int i = 0, p = mItems.size(); i < p; i++) {
            map.put(i, false);
        }
    }

    @Override
    public ItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_main_item, parent, false);
        ItemViewHolder itemViewHolder = new ItemViewHolder(view);
        return itemViewHolder;
    }

    @Override
    public void onBindViewHolder(final ItemViewHolder holder, final int position) {
        if (null == mItems || mItems.size() <= 0) {
            return;
        }
        holder.name.setText(mItems.get(position).getName());
        holder.desc.setText(mItems.get(position).getDesc());

        holder.checkBox.setTag(new Integer(position));//防止划回来时选中消失

        if (map != null) {
            ((ItemViewHolder) holder).checkBox.setChecked((map.get(position)));
        } else {
            ((ItemViewHolder) holder).checkBox.setChecked(false);
        }
        holder.checkBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int mFlags = (Integer) view.getTag();
                if (map != null) {
                    if (map.get(position)) {
                        map.put(position, false);
                        eventBus.post(new SelectEvent(selected(map)));
                    } else {
                        map.put(mFlags, Boolean.TRUE);
                        eventBus.post(new SelectEvent(selected(map)));
                    }
                }
            }
        });
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mItemClickListener.onItemClick(holder,holder.getAdapterPosition());
            }
        });
        holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                mItemClickListener.onItemLongClick(holder,holder.getAdapterPosition());
                return true;
            }
        });
    }

    private int selected(HashMap map) {
        int size = 0;
        for (Integer key : map.keySet()) {
            if(map.get(key)){
                size++;
            }
        }
        return size;
    }
    @Override
    public int getItemCount() {
        return mItems == null? 0 :mItems.size();
    }
    public static class ItemViewHolder extends RecyclerView.ViewHolder{

        public final CheckBox checkBox;
        public final TextView name;
        public final TextView desc;

        public ItemViewHolder(View itemView) {
            super(itemView);
            checkBox = (CheckBox) itemView.findViewById(R.id.checkbox);
            name = (TextView) itemView.findViewById(R.id.tv_name);
            desc = (TextView) itemView.findViewById(R.id.tv_desc);
        }
    }

    public HashMap getMap() {
        return map;
    }

    public void setMap(HashMap map) {
        this.map = map;
        notifyDataSetChanged();
    }

    /**
     * 点击事件和长按事件
     */
    public interface ItemClickListener{
        void onItemClick(RecyclerView.ViewHolder holder , int position);
        void onItemLongClick(RecyclerView.ViewHolder holder , int position);
    }

    private ItemClickListener mItemClickListener;
    public void setOnItemClickListener(ItemClickListener listener){
        this.mItemClickListener=listener;
    }
}

3、我们新建实体Book和SelectEvent

package com.aikaifa.checkall.bean;

public class Book {

    private int id;
    private String name;
    private String desc;

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public Book() {
    }
}

public class SelectEvent {
    private int size;

    public SelectEvent(int size) {
        this.size = size;
    }

    public int getSize() {
        return size;
    }
}

4、建立checkbox_selector.xml选中样式

5、建立一个activity_main.xml布局

activity_main_item布局

这样关于RecyclerView实现全选，ItemTouchHelper实现侧滑删除,拖拽功能就完成了。

RecyclerView实现全选，ItemTouchHelper实现侧滑删除,拖拽功能
项目地址
https://github.com/88ios/RecyclerViewCheckAll
【END】

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