Android进阶之路

目前没有把全选，反选，全部取消的功能集成到此Demo中，只实现了基本的选取记录与记录功能。

存在问题与解决方案：

问题：RecyclerView\checkBox的复用问题，导致checkBox出现选取0角标的box时候角标10同样被选取
解决：给予CheckBox的状态记录

开发中心思维：

使用map集合来存储对应角标的对应状态，一般为Map”Intenger,Boolean”，在使用中如某一条信息被选取，那么就是记录当前的角标位为true，即被选取的状态，之后循环我们的Lists总数据，同时内部循环map记录的角标位，判断为true的时候，获取数据存储到新的List中！

build :

compile 'com.android.support:recyclerview-v7:24.2.1'

Effect :

MainActivity :

package com.yl.checkbox.checkboxdata;import android.content.Context;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.text.TextUtils;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.TextView;import android.widget.Toast;import org.greenrobot.eventbus.EventBus;import org.greenrobot.eventbus.Subscribe;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;public class MainActivity extends AppCompatActivity implements View.OnClickListener {    private RecyclerView mRvView;    private TextView mAll;    private TextView mCancel;    private TextView mInvert;    private CheckAdapter checkAdapter;    private List<String> lists;    private List<String>listDatas=new ArrayList<>();    private TextView mGetData;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        lists = new ArrayList<>();        for(int i=0;i<20;i++){            lists.add("没有什么能够阻挡，天马星空的梦想"+i);        }        initView();        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);        mRvView.setLayoutManager(linearLayoutManager);        checkAdapter = new CheckAdapter(this, lists);        mRvView.setAdapter(checkAdapter);        //子条目监听        checkAdapter.setItemClickListener(new RecyclerViewOnItemClickListener() {            @Override            public void onItemClickListener(View view, int position) {                Toast.makeText(MainActivity.this,"If you are happy - "+ position,Toast.LENGTH_SHORT).show();                //设置选中的项                checkAdapter.setSelectItem(position);            }        });    }    private void initView() {        mRvView = (RecyclerView) findViewById(R.id.rv_view);        mAll = (TextView) findViewById(R.id.tv_all);        mCancel = (TextView) findViewById(R.id.tv_cancel);        mInvert = (TextView) findViewById(R.id.tv_invert);        mGetData = (TextView) findViewById(R.id.tv_getData);        mAll.setOnClickListener(this);        mCancel.setOnClickListener(this);        mInvert.setOnClickListener(this);        mGetData.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()){            case R.id.tv_getData:                String content ="";                listDatas.clear();                Toast.makeText(MainActivity.this,"获取我们选取的数据",Toast.LENGTH_SHORT).show();                Log.e("TAG",mGetData.getText().toString());                Map<Integer, Boolean> map = checkAdapter.getMap();                for(int i =0;i<lists.size();i++){                    if(map.get(i)){                        listDatas.add(lists.get(i));                    }                }                //这里是为了测试我们的结果 ，可忽略！                for (int j=0;j<listDatas.size();j++){                    Log.e("TAG",listDatas.get(j));                    content+=listDatas.get(j);                }                mGetData.setText(content);                Log.e("TAG",content);                break;            //以下三个功能后续扩展            case R.id.tv_all:                Toast.makeText(MainActivity.this,"全选",Toast.LENGTH_SHORT).show();                break;            case R.id.tv_cancel:                Toast.makeText(MainActivity.this,"取消全选",Toast.LENGTH_SHORT).show();                break;            case R.id.tv_invert:                Toast.makeText(MainActivity.this,"反选",Toast.LENGTH_SHORT).show();                break;        }    }    //Adapter数据填充    class CheckAdapter extends RecyclerView.Adapter<CheckAdapter.CheckViewHolder>{        private Context mContext;        private List<String> lists;        private HashMap<Integer,Boolean>Maps=new HashMap<Integer,Boolean>();        private HashMap<Integer,Boolean>AllMaps=new HashMap<Integer,Boolean>();        public RecyclerViewOnItemClickListener onItemClickListener;        //成员方法，初始化checkBox的状态，默认全部不选中        public CheckAdapter(Context context, List<String> lists){            this.mContext=context;            this.lists=lists;            initMap();        }        //初始化map内的数据状态，全部重置为false，即为选取状态        private void initMap() {            for (int i = 0; i < lists.size(); i++) {                Maps.put(i, false);            }        }        //获取最终的map存储数据        public Map<Integer,Boolean>getMap(){            return Maps;        }        //后续扩展 - 获取最终的map存储数据        public Map<Integer,Boolean>getAllMap(){            return AllMaps;        }        //点击item选中CheckBox        public void setSelectItem(int position) {            //对当前状态取反            if (Maps.get(position)) {                Maps.put(position, false);            } else {                Maps.put(position, true);            }            notifyItemChanged(position);        }        @Override        public CheckAdapter.CheckViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {            CheckViewHolder checkViewHolder = new CheckViewHolder(LayoutInflater.from(MainActivity.this).inflate(R.layout.item_layout, parent,false),onItemClickListener);            return checkViewHolder;        }        @Override        public void onBindViewHolder(CheckAdapter.CheckViewHolder holder, final int position) {            holder.mName.setText(lists.get(position));            holder.mCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {                @Override                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {                    Maps.put(position,isChecked);                }            });            if(Maps.get(position)==null){                Maps.put(position,false);            }            //没有设置tag之前会有item重复选框出现，设置tag之后，此问题解决            holder.mCheckBox.setChecked(Maps.get(position));            //之后扩展使用            AllMaps.put(position,true);        }        @Override        public int getItemCount() {            return lists ==null?0:lists.size();        }        public void setItemClickListener(RecyclerViewOnItemClickListener onItemClickListener) {            this.onItemClickListener = onItemClickListener;        }        class CheckViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {            private RecyclerViewOnItemClickListener mListener;            private  TextView mName;            private  CheckBox mCheckBox;            public CheckViewHolder(View itemView,RecyclerViewOnItemClickListener onItemClickListener) {                super(itemView);                this.mListener = onItemClickListener;                itemView.setOnClickListener(this);                mName = (TextView) itemView.findViewById(R.id.item_name);                mCheckBox = (CheckBox) itemView.findViewById(R.id.item_cb);            }            @Override            public void onClick(View v) {                if (mListener != null) {                    mListener.onItemClickListener(v, getPosition());                }            }        }    }    //接口回调设置点击事件    public interface RecyclerViewOnItemClickListener {        //点击事件        void onItemClickListener(View view, int position);    }}

MainActivity Xml :

<?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:layout_width="match_parent"    android:orientation="vertical"    android:layout_height="match_parent"    tools:context="com.yl.checkbox.checkboxdata.MainActivity">    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal"        android:visibility="gone"        >        <TextView            android:layout_width="0dp"            android:layout_weight="1"            android:layout_height="25dp"            android:gravity="center"            android:id="@+id/tv_all"            android:text="全选" />        <TextView            android:layout_width="0dp"            android:layout_weight="1"            android:layout_height="25dp"            android:gravity="center"            android:id="@+id/tv_cancel"            android:text="取消全选" />        <TextView            android:layout_width="0dp"            android:layout_weight="1"            android:id="@+id/tv_invert"            android:layout_height="25dp"            android:gravity="center"            android:text="反选" />    </LinearLayout>    <View        android:layout_width="match_parent"        android:layout_height="2dp"        android:background="#21aae3"        />    <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="获取选取数据"        android:gravity="center"        android:padding="5dp"        android:id="@+id/tv_getData"        />    <View        android:layout_width="match_parent"        android:layout_height="2dp"        android:background="#21aae3"        />    <android.support.v7.widget.RecyclerView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:id="@+id/rv_view"        >    </android.support.v7.widget.RecyclerView></LinearLayout>