前言
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。在Android L SDK发布的新API中最有意思的就是RecyclerView 和 CardView了， 按照官方的说法， RecyclerView 一个ListView 的一个更高级更灵活的一个版本， 可以自定义的东西太多了。
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.
方法如下
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<Book> 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<Integer, Boolean> map = new HashMap<Integer, Boolean>(); 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<ListAdapter.ItemViewHolder> { private List<Book> mItems; private List<Book> selected; public HashMap<Integer, Boolean> map; private EventBus eventBus; public ListAdapter(List<Book> 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<Integer, Boolean> 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<Integer, Boolean> getMap() { return map; } public void setMap(HashMap<Integer, Boolean> 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
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@mipmap/checkbox_pressed" android:state_checked="true"/> <item android:drawable="@mipmap/checkbox_normal" android:state_checked="false"/> <item android:drawable="@mipmap/checkbox_normal"/> </selector>
5、建立一个activity_main.xml布局
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <CheckBox android:id="@+id/checkbox" android:layout_width="wrap_content" android:layout_height="wrap_content" android:drawablePadding="10dp" android:text="全选" android:textColor="#969696" android:textSize="12sp" /> <TextView android:id="@+id/selected" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:gravity="center_vertical" android:text="已选0项" /> </LinearLayout> <android.support.v7.widget.RecyclerView android:id="@+id/recyclerview" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout>
activity_main_item布局
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/item" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:clickable="true" android:focusable="true"> <RelativeLayout android:id="@+id/rl_app" android:layout_width="50dp" android:layout_height="50dp" android:layout_centerHorizontal="true"> <ImageView android:id="@+id/iv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@mipmap/ic_launcher" /> <CheckBox android:id="@+id/checkbox" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_gravity="center_vertical" android:button="@drawable/checkbox_selector" /> </RelativeLayout> <TextView android:id="@+id/tv_name" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/rl_app" android:gravity="center" android:text="name" android:textColor="#ffffff" /> <TextView android:id="@+id/tv_desc" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/tv_name" android:gravity="center" android:textColor="#f5f5f5" android:textSize="9sp" /> </RelativeLayout>
这样关于RecyclerView实现全选，ItemTouchHelper实现侧滑删除,拖拽功能就完成了。
示例代码下载：
项目地址：https://github.com/88ios/RecyclerViewCheckAll
本地下载：点击这里
总结
以上就是这篇文章的全部内容了，希望本文的内容对各位Android开发者们能带来一定的帮助，如果有疑问大家可以留言交流，谢谢大家对脚本之家的支持。