Android利用RecyclerView实现全选、置顶和拖拽功能示例

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

来源：http://www.jianshu.com/p/7082b7d10760