CheckBox以及RecyclerView的初步使用

来源：互联网发布：广州数控车床编程视频编辑：程序博客网时间：2024/06/05 04:23

先简单说说RecyclerView吧，自Android 5.0之后，谷歌公司推出了RecylerView控件，首先RecyclerView是通过导入support-v7包对其使用是一个强大的滑动组件，RecylerView封装了viewholder的回收复用，使其的扩展性非常强，RecyclerView完全可以取代ListView和GridView所展示的效果，下面我做了一个小Demo，本Deom实现的功能是电商App购物车全选按钮以及RecyclerView的初步使用：

第一步：Activity的布局文件：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.bwie.caolei.allcheckbox.MainActivity">    <android.support.v7.widget.RecyclerView        android:id="@+id/recycler"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_above="@+id/linear"></android.support.v7.widget.RecyclerView>    <LinearLayout        android:id="@+id/linear"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:orientation="horizontal">        <CheckBox            android:id="@+id/all"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="全选" />        <Button            android:id="@+id/reverse"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="反选" />    </LinearLayout></RelativeLayout>

注明：RecyclerView的包

compile 'com.android.support:recyclerview-v7:24.1.1'

Activity

package com.bwie.caolei.allcheckbox;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.view.View;import android.widget.Button;import android.widget.CheckBox;import android.widget.ListView;import android.widget.Toast;import com.bwie.caolei.allcheckbox.adapter.MyAdapter;import com.bwie.caolei.allcheckbox.adapter.RecyclerViewAdapter;import com.bwie.caolei.allcheckbox.bean.Statu;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {    private ListView lv;    private CheckBox all;    private Button reverse;    private String path = "http://japi.juhe.cn/joke/content/list.from?key=%20874ed931559ba07aade103eee279bb37%20&page=2&pagesize=10&sort=asc&time=1418745237";    private MyAdapter adapter;    private Statu statu;    private List<Statu.ResultBean.DataBean> data;    private RecyclerView recycler;    private RecyclerViewAdapter recyclerViewAdapter;    private List<String> list = new ArrayList<>();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        initData();    }    private void initData() {        for (int i = 0; i < 30; i++) {            list.add("这是条目" + i);        }        recyclerViewAdapter = new RecyclerViewAdapter(list, MainActivity.this,all);        recycler.setAdapter(recyclerViewAdapter);    }    private void initView() {        recycler = (RecyclerView) findViewById(R.id.recycler);        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(MainActivity.this);        linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);        recycler.setLayoutManager(linearLayoutManager);        all = (CheckBox) findViewById(R.id.all);        reverse = (Button) findViewById(R.id.reverse);        all.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                boolean flag = all.isChecked();                for (int i = 0; i < recyclerViewAdapter.getSelect().size(); i++) {                    recyclerViewAdapter.getSelect().set(i, flag);                }                recyclerViewAdapter.notifyDataSetChanged();            }        });        reverse.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                if (!recyclerViewAdapter.getSelect().contains(true)) {                    Toast.makeText(MainActivity.this, "请选择", Toast.LENGTH_SHORT).show();                } else {                    for (int i = 0; i < recyclerViewAdapter.getSelect().size(); i++) {                        if (recyclerViewAdapter.getSelect().get(i)) {                            recyclerViewAdapter.getSelect().set(i, false);                        } else {                            recyclerViewAdapter.getSelect().set(i, true);                        }                    }                    if (recyclerViewAdapter.getSelect().contains(false)) {                        all.setChecked(false);                    }                    recyclerViewAdapter.notifyDataSetChanged();                }            }        });    }}

接下来就是适配器了，RecyclerVie和ListView和GridView适配器还是有区别的，ListView和GridView自定义BaseAdapter里有四个方法，那么RecyclerVie继承自RecyclerView.Adapter的，它的泛型是类名.MyViewHolder的，接下来看一下简单的适配器：

package com.bwie.caolei.allcheckbox.adapter;import android.content.Context;import android.support.v7.widget.RecyclerView;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.CheckBox;import android.widget.TextView;import com.bwie.caolei.allcheckbox.R;import com.bwie.caolei.allcheckbox.bean.Statu;import java.util.ArrayList;import java.util.LinkedList;import java.util.List;public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.MyViewHolder>{    private List<Statu.ResultBean.DataBean> data;    private List<String> list = new ArrayList<>();    private Context context;    private CheckBox all;    LinkedList<Boolean> linkedList = new LinkedList<Boolean>();    public RecyclerViewAdapter(List<String> list, Context context, CheckBox all) {        this.list = list;        this.context = context;        this.all = all;        for (int i = 0; i < list.size(); i++) {            linkedList.add(false);        }    }    @Override    public RecyclerViewAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        MyViewHolder holder = new MyViewHolder(LayoutInflater.from(context).inflate(R.layout.list_item,parent,false));        return holder;    }    //对外提供一个方法 获取这个集合    public List<Boolean> getSelect() {        return linkedList;    }    @Override    public void onBindViewHolder(RecyclerViewAdapter.MyViewHolder holder, final int position) {        holder.tv.setText(list.get(position));        holder.ck.setChecked(linkedList.get(position));        holder.ck.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                linkedList.set(position, ! linkedList.get(position));                if (linkedList.contains(false)) {                    all.setChecked(false);                } else {                    all.setChecked(true);                }                notifyDataSetChanged();            }        });    }    @Override    public int getItemCount() {        return list.size();    }    public class MyViewHolder extends RecyclerView.ViewHolder {        private final TextView tv;        private final CheckBox ck;        public MyViewHolder(View itemView) {            super(itemView);            tv = (TextView) itemView.findViewById(R.id.tv);            ck = (CheckBox) itemView.findViewById(R.id.ck);        }    }}

这个Demo可以看到全选反选按钮，RecyclerView的效果也和ListView的一样，完成以上代码即可展示下图：

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