Android 列表的多选

我做开发遇到一个多选的需求，也不是太难，挺好做的，所以就分享个大家。那就是列表的多选，不多说了，直接上代码。

基本上都是在适配器中操作。

package com.example.mvcframework.adapter;

import android.Manifest;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.util.SparseBooleanArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.example.mvcframework.R;
import com.example.mvcframework.activity.CultivateActivity;
import com.example.mvcframework.activity.FileDisplayActivity;
import com.example.mvcframework.entity.CultivateEntity;
import com.example.mvcframework.entity.Test_Tree_Assart;
import com.example.mvcframework.utils.Urls;

import java.util.ArrayList;
import java.util.List;

import pub.devrel.easypermissions.EasyPermissions;

public class Exame_Ti_Adapter extends RecyclerView.Adapter{
    private CultivateActivity context;
    private List children;
    private int type;
    private boolean isselect;
    private SparseBooleanArray mSelectedPositions = new SparseBooleanArray();
    public  Exame_Ti_Adapter( CultivateActivity context,List children){
        this.context=context;
        this.children=children;



    }
    public void setType(int type){
        this.type=type;
        notifyDataSetChanged();

    }
    public void isSelect(boolean isselcet){
        this.isselect=isselcet;

        notifyDataSetChanged();
    }


    @Override
    public Selects_ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.item_wdxz_textlayout,parent,false);
        Selects_ViewHolder viewHolder =new Selects_ViewHolder(view);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(Selects_ViewHolder holder, int position) {
        CultivateEntity.DataBean.ChildrenBean childrenBean = children.get(position);
        holder.text_jtsz.setText(childrenBean.getOB_Name());
        holder.tvJs.setText("讲师："+ childrenBean.getOB_lecturer());
        holder.tvlx.setText("类型："+childrenBean.getBOD_Name());
        int i = childrenBean.getCreateDateTime().indexOf(" ");
        String substring = childrenBean.getCreateDateTime().substring(0, i);
        holder.show_dn_time.setText(substring);
        Glide.with(context).load(Urls.DZ+childrenBean.getOB_Phone()).crossFade().placeholder(R.mipmap.base_map).into(holder.iv_icon);
        if (isselect==true){
            holder.rb_option1.setChecked(true);
            setItemChecked(position,true);
            boolean b = mSelectedPositions.get(position);
            Log.d("blloen", "onBindViewHolder: "+b);

        }else{
            holder.rb_option1.setChecked(isItemChecked(position));
        }
        if (type==0){
                holder.rb_option1.setVisibility(View.GONE);
            }else{
                holder.rb_option1.setVisibility(View.VISIBLE);

            }


        holder.rb_option1.setOnClickListener(view -> {
            if (isItemChecked(position)) {
                setItemChecked(position, false);
                holder.rb_option1.setChecked(false);
            } else {
                setItemChecked(position, true);
                holder.rb_option1.setChecked(true);
            }
        });
       holder.buttonCk.setOnClickListener(view -> {
           String[] perms = new String[]{Manifest.permission.READ_EXTERNAL_STORAGE,
                   Manifest.permission.WRITE_EXTERNAL_STORAGE};

           if (!EasyPermissions.hasPermissions(context, perms)) {
               EasyPermissions.requestPermissions(context, "需要访问手机存储权限！", 10086, perms);
           } else {
               FileDisplayActivity.show(context, Urls.DZ+children.get(position).getOB_Pdf());
           }
       });


    }

    @Override
    public int getItemCount() {
        return children.size();
    }
    //根据位置判断条目是否选中
    private boolean isItemChecked(int position) {
        return mSelectedPositions.get(position);
    }
    //设置给定位置条目的选择状态
    private void setItemChecked(int position, boolean isChecked) {
        mSelectedPositions.put(position, isChecked);
    }

    public List getSelectedItem() {
        ListselectList=new ArrayList<>();
        for (int i = 0; i < children.size(); i++) {
            if (isItemChecked(i)) {
               selectList.add(children.get(i).getID());
            }
        }
        return selectList;
    }
}
class  Selects_ViewHolder extends RecyclerView.ViewHolder{
    public RadioButton rb_option1;
    public ImageView iv_icon;
    public TextView text_jtsz,tvlx,tvJs,show_dn_time;
    public Button buttonCk;



    public Selects_ViewHolder(View itemView) {
        super(itemView);
        rb_option1 = (RadioButton) itemView.findViewById(R.id.radio);
        iv_icon = (ImageView) itemView.findViewById(R.id.iv_icon);
        text_jtsz= (TextView) itemView.findViewById(R.id.text_jtsz);
        tvlx= (TextView) itemView.findViewById(R.id.tvlx);
        tvJs= (TextView) itemView.findViewById(R.id.tvJs);
        buttonCk= (Button) itemView.findViewById(R.id.buttonCk);
        show_dn_time= (TextView) itemView.findViewById(R.id.show_dn_time);//下载时间


    }
}

最后就是通过adapter.getSelectedItem（）。获取到一个集合。完成！