recyclerview全选反选以及总价

最新推荐文章于 2024-09-16 15:34:36 发布

原创最新推荐文章于 2024-09-16 15:34:36 发布 · 221 阅读

CC 4.0 BY-SA版权

本文详细介绍了安卓应用主页面的设计与实现过程，包括使用RecyclerView进行数据展示，CheckBox实现多选功能，以及通过Adapter适配器管理条目布局。通过对MainActivity的解析，展示了如何集成RecyclerView、CheckBox和TextView组件，并实现数据加载、显示和交互。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

1activity主页面布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".view.activity.MainActivity">
    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </android.support.v7.widget.RecyclerView>
    <LinearLayout
        android:orientation="horizontal"
        android:id="@+id/linear_bottom"
        android:layout_width="match_parent"
        android:layout_alignParentBottom="true"
        android:background="#999999"
        android:layout_height="48dp">
        <CheckBox
            android:id="@+id/select_all"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            />
        <TextView
            android:id="@+id/price_all"
            android:text="¥100"
            android:layout_gravity="center_vertical"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </LinearLayout>
</RelativeLayout>

2.activity主页面

package com.example.mycheckbox.view.activity;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;

import com.example.mycheckbox.R;
import com.example.mycheckbox.model.NewsBean;
import com.example.mycheckbox.presenter.MainPresenter;
import com.example.mycheckbox.view.adapter.MyAdapter;
import com.example.mycheckbox.view.interfaces.IMainView;

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

public class MainActivity extends BaseActivity implements IMainView<NewsBean>,View.OnClickListener {


    private RecyclerView recyclerView;
    private MainPresenter mainPresenter;
    private int page=1;
    private LinearLayoutManager linearLayoutManager;
    private MyAdapter myAdapter;
    private CheckBox select_all;
    private TextView price_all;


    @Override
    protected int bindLayout() {
        return R.layout.activity_main;
    }

    @Override
    protected void initView() {
        recyclerView = findViewById(R.id.recyclerView);
        select_all = findViewById(R.id.select_all);
        price_all = findViewById(R.id.price_all);
        select_all.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

            }
        });
    }

    @Override
    protected void initData() {
        mainPresenter = new MainPresenter();
        mainPresenter.loadDataNew(page);
        mainPresenter.setView(this);
        linearLayoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(linearLayoutManager);
        myAdapter = new MyAdapter(this);
        recyclerView.setAdapter(myAdapter);
        myAdapter.setCheckBox(select_all);
        myAdapter.setText(price_all);
    }

    @Override
    public void onSuccess(NewsBean newsBean) {
        List<NewsBean.ResultsBean> results = newsBean.getResults();
        myAdapter.setData((ArrayList<NewsBean.ResultsBean>) results);
    }

    @Override
    public void onErr(String err) {

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mainPresenter.datachView();
    }

    @Override
    public void onClick(View v) {

    }
}

3.多选框以及条目布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    tools:context=".view.activity.MainActivity">
    <CheckBox
        android:id="@+id/select_xuan"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_alignParentLeft="true"
        />

    <TextView
        android:id="@+id/name"
        android:layout_width="match_parent"
        android:layout_height="48dp"
        android:textSize="18sp"
        android:layout_toRightOf="@+id/select_xuan"
        android:layout_centerInParent="true"
        />

    <ImageView
        android:id="@+id/image"
        android:src="@mipmap/ic_launcher"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:visibility="gone"
        android:layout_alignParentLeft="true"/>



</RelativeLayout>

4.adapter适配器

package com.example.mycheckbox.view.adapter;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.example.mycheckbox.R;
import com.example.mycheckbox.model.NewsBean;
import com.example.mycheckbox.view.activity.MainActivity;

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

/**
 * @Auther: 薄帅北
 * @Date: 2019/3/6 14:46:34
 * @Description:
 */
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
    private Context mContext;
    private ArrayList<NewsBean.ResultsBean> mList=new ArrayList<>();
    private CheckBox mCheckBox;
    private TextView priceAll;
    private float num = 0;

    public MyAdapter(Context context) {
        this.mContext=context;
    }
    public void setData(ArrayList<NewsBean.ResultsBean> list ){
        this.mList=  list;
        notifyDataSetChanged();
    }

    @NonNull
    @Override
    public MyAdapter.MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(mContext).inflate(R.layout.activity_check, null);
        MyViewHolder myViewHolder = new MyViewHolder(view);
        return myViewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull MyAdapter.MyViewHolder myViewHolder, final int i) {
        if (mList.get(i)!=null){
            myViewHolder.name.setText(i+""+mList.get(i).getTitle()+"");
            Glide.with(mContext).load(mList.get(i).getUrl()).into(myViewHolder.image);
        }
        Log.e("myMessage","==="+"i"+i);
        myViewHolder.select_xuan.setChecked(mList.get(i).isChecked());
        myViewHolder.select_xuan.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                mList.get(i).setChecked(isChecked);
                boolean selectAll = isSelectAll();
                mCheckBox.setChecked(selectAll);
                float price = mList.get(i).getPrice();
                if (isChecked){
                    num+=price;
                }else{
                    num-=price;
                }
                priceAll.setText(num+"");
            }


        });
    }
    private boolean isSelectAll() {
        for (int i = 0; i < mList.size(); i++) {
            boolean checked = mList.get(i).isChecked();
            if (!checked){
                return false;
            }
        }
        return true;
    }

    @Override
    public int getItemCount() {
        return mList.size();
    }
    //全选反选
    public void setCheckBox(CheckBox select_all) {
        this.mCheckBox=select_all;
        mCheckBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                CheckBox checkBoxb=(CheckBox) v;
                boolean checked = checkBoxb.isChecked();
                selectAll(checked);
            }


        });
    }
    //全选反选
    private void selectAll(boolean checked) {
        for (int i = 0; i <mList.size() ; i++) {
            NewsBean.ResultsBean resultsBean=mList.get(i);
            resultsBean.setChecked(checked);
        }
        notifyDataSetChanged();
    }

    public void setText(TextView price_all) {
        this.priceAll=price_all;
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {
        public TextView name;
        public ImageView image;
        public CheckBox select_xuan;
         public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            name = itemView.findViewById(R.id.name);
            image = itemView.findViewById(R.id.image);
            select_xuan = itemView.findViewById(R.id.select_xuan);
        }
    }
}