Recyclerview+checkbox 简单的购物车效果

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<LinearLayout
android:layout_margin="20dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="全选"
android:id="@+id/check_all"
/>
<Button
android:layout_marginLeft="150dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="反选"
android:id="@+id/check_reveser"
/>
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/recycler"
></android.support.v7.widget.RecyclerView>
</LinearLayout>

<?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="wrap_content"android:layout_margin="10dp"android:orientation="horizontal"><TextViewandroid:id="@+id/tv"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:text="nihao "android:textAppearance="?android:attr/textAppearanceLarge" /><CheckBoxandroid:id="@+id/cb"android:layout_width="24dp"android:layout_height="24dp"android:layout_marginRight="10dp"/></LinearLayout>

package test.bwie.com.liugang20170619;import android.content.DialogInterface;import android.os.Bundle;import android.support.v7.app.AlertDialog;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.DefaultItemAnimator;import android.support.v7.widget.DividerItemDecoration;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.util.Log;import android.util.SparseArray;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.Button;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.LinearLayout;import android.widget.TextView;import android.widget.Toast;/*** @ Description:主业务操作类  RecyclerView嵌套checkbox* @ Date:2017/6/19* @ Author:刘刚*/public class MainActivity extends AppCompatActivity implements View.OnClickListener {private Button check_all;private Button check_reveser;private RecyclerView recycler;private LinearLayout activity_main;private MyAdapter adapter;SparseArray<Boolean> checkStates;// 存储勾选框状态的map集合@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();initDate();}private void initView() {check_all = (Button) findViewById(R.id.check_all);   //根据ID初始化控价check_reveser = (Button) findViewById(R.id.check_reveser);recycler = (RecyclerView) findViewById(R.id.recycler);activity_main = (LinearLayout) findViewById(R.id.activity_main);check_all.setOnClickListener(this);   //设置checkbox监听事件check_reveser.setOnClickListener(this);adapter = new MyAdapter();recycler.setAdapter(adapter);   //设置适配器recycler.setLayoutManager(new LinearLayoutManager(this)); //添加布局管理器recycler.setItemAnimator(new DefaultItemAnimator());  //添加默认动画recycler.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL)); //添加默认分割线//条目的点击事件和长按事件adapter.setRecyclerViewOnItemClickListener(new RecyclerViewOnItemClickListener() {@Overridepublic void onItemClickListener(View view, int position) {Toast.makeText(MainActivity.this, "这是条目"+(position+1), Toast.LENGTH_SHORT).show();}@Overridepublic boolean onItemLongClickListener(View view, final int position) {/* AlertDialog dialog = new AlertDialog.Builder(MainActivity.this).create();dialog.setMessage("这是条目"+(position+1));dialog.show();*/final AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {}}).setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {}}).setTitle("警示").setMessage("这是条目"+(position+1)).show();return false;}});}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.check_all:selectAll();break;case R.id.check_reveser:reverse();break;}}//    反选private void reverse() {for (int i = 0; i < checkStates.size(); i++) {if (checkStates.valueAt(i)) {checkStates.setValueAt(i, false);} else {checkStates.setValueAt(i, true);}}adapter.notifyDataSetChanged();}//    全选private void selectAll() {for (int i = 0; i < checkStates.size(); i++) {checkStates.setValueAt(i, true);}adapter.notifyDataSetChanged();}//    初始化100条数据private void initDate() {checkStates = new SparseArray<>();for (int i = 0; i < 100; i++) {checkStates.put(i, false);}}//为Recyclerview设置适配器private class MyAdapter extends RecyclerView.Adapter<MyViewHolder> implements View.OnClickListener, View.OnLongClickListener {//接口实例public RecyclerViewOnItemClickListener onItemClickListener;@Overridepublic MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {View v = LayoutInflater.from(MainActivity.this).inflate(R.layout.item,parent,false);MyViewHolder  holder = new MyViewHolder(v);v.setOnClickListener(this);v.setOnLongClickListener(this);return holder;}@Overridepublic void onBindViewHolder(final MyViewHolder holder, final int position) {holder.tv.setText((position+1)+"");holder.checkBox.setText(checkStates.keyAt(position)+"");//设置Tagholder.root.setTag(position);//            用户点击checkbox行为会需要增加监听来改变checkStates对应项的状态holder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {Log.v("check",position+":"+isChecked);checkStates.put(position,isChecked);}});//这里为一点小坑，就是上面所说的滑屏选中状态丢失的现象，所以在checkbox的选中监听里我们需要将checkbox//的选择状态和选择条目的position记录下来，在bindviewholder中设置选中，可以完美解决      

      holder.checkBox.setChecked( checkStates.get(position));}@Overridepublic int getItemCount() {return checkStates.size();}@Overridepublic void onClick(View v) {if (onItemClickListener != null) {//注意这里使用getTag方法获取数据onItemClickListener.onItemClickListener(v, (Integer) v.getTag());}}//长按事件@Overridepublic boolean onLongClick(View v) {//不管显示隐藏，清空状态return onItemClickListener != null && onItemClickListener.onItemLongClickListener(v, (Integer) v.getTag());}//设置点击事件public void setRecyclerViewOnItemClickListener(RecyclerViewOnItemClickListener onItemClickListener) {this.onItemClickListener = onItemClickListener;}}//接口回调设置点击事件public interface RecyclerViewOnItemClickListener {//点击事件void onItemClickListener(View view, int position);//长按事件boolean onItemLongClickListener(View view, int position);}private class MyViewHolder extends RecyclerView.ViewHolder{public CheckBox checkBox;public TextView tv;private View root;public MyViewHolder(View root) {super(root);this.root = root;checkBox = (CheckBox)root.findViewById(R.id.cb);tv = (TextView) root.findViewById(R.id.tv);}}}