AndroidStudio RecyclerView史上最详解

因为时间不够，先整理一些小知识点，最后再统一排版

1 RecyclerView点击事件

//设置点击事件的接口
private Inspection_Switch_One_Level_Adapter.ItemClickListener mItemClickListener;

public interface ItemClickListener {
    void onItemClick(int position);
}

public void setOnItemClickListener(Inspection_Switch_One_Level_Adapter.ItemClickListener itemClickListener) {
    this.mItemClickListener = itemClickListener;
}

在onBindViewHolder中加入如下代码

if (mItemClickListener != null) {
    holder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //if (mEditMode == 1) {
                //if (!isSelect.get(position)) {
                    //holder.ImageView_Switch_Check.setImageResource(R.drawable.ic_checked);
                  //  isSelect.remove(position);
                    //isSelect.put(position, true);
                //} else {
                    //holder.ImageView_Switch_Check.setImageResource(R.drawable.ic_uncheck);
                    //isSelect.remove(position);
                    //isSelect.put(position, false);
                //}
            //}
            //mItemClickListener.onItemClick(position);
        }
    });
}

2 RecyclerView长按事件

private Inspection_Switch_One_Level_Adapter.OnItemLongClickListener monItemLongClickListener;

public interface OnItemLongClickListener {
    void onItemLongClickListener(int position);
}

public void setMonItemLongClickListener(Inspection_Switch_One_Level_Adapter.OnItemLongClickListener monItemLongClickListener) {
    this.monItemLongClickListener = monItemLongClickListener;
}

在onBindViewHolder中加入如下代码：
if (monItemLongClickListener != null) {
    holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {
            monItemLongClickListener.onItemLongClickListener(position);
            //返回值设为true表示消耗了时间不会传递
            return true;
        }
    });
}

3 RecyclerView 滑动之后导致RadioButton错乱的问题

由于RecyclerView的onBindViewHolder()方法，只有在getItemViewType()返回类型不同时才会调用，这点是跟ListView的getView()方法不同的地方，所以如果想要每次都调用onBindViewHolder()刷新item数据，就要重写getItemViewType()，让其返回position，否则很容易产生数据错乱的现象。
我这是是先用一个HashMap将RadioButton的选中情况与item的position情况存起来以便后面的调用，然后再重写getItemViewType()方法返回值是position即可保证RadioButton选中情况不发生错乱，

本demo可在日志中完整打印出来结果，便于查看。

下面是代码：
1)适配器的代码：

package com.example.administrator.radiobutton_test_1;

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.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

import java.util.HashMap;
import java.util.List;

/**
 * Created by Administrator on 2019/1/9 0009.
 */

public class RBandETtest_Adapter extends RecyclerView.Adapter<RBandETtest_Adapter.ViewHolder> {
    private List<RBandETtest> mRBandETtestList;
    private int layoutPosition;

    static class ViewHolder extends RecyclerView.ViewHolder {
        RadioGroup radioGroup;
        RadioButton radioButton_Yes;
        RadioButton radioButton_No;
        TextView editText_remark;

        public ViewHolder(View view) {
            super(view);
            radioButton_Yes = (RadioButton) view.findViewById(R.id.RadioButton_Yes);
            radioButton_No = (RadioButton) view.findViewById(R.id.RadioButton_No);
            radioGroup = (RadioGroup) view.findViewById(R.id.radioGroup);
            editText_remark = (TextView) view.findViewById(R.id.editText_remark);
        }
    }

    public RBandETtest_Adapter(List<RBandETtest> RBandETtestList) {
        mRBandETtestList = RBandETtestList;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.rbandettest_item, parent, false);
        ViewHolder holder = new ViewHolder(view);
        return holder;
    }
    //0代表否，1代表是，2代表未选择
    private static HashMap<Integer, Integer> isSelect = new HashMap<>();

    public void iniChossen() {
        //这里取反
        for (int i = 0; i < mRBandETtestList.size(); i++) {
            isSelect.put(i, 2);
        }
    }
    public void setSelectCondition(int position) {
        if (b.equals("是")) {
            isSelect.remove(position);
            isSelect.put(position, 1);
        } else if (b.equals("否")) {
            isSelect.remove(position);
            isSelect.put(position, 0);
        } else {

        }
    }

    public HashMap<Integer, Integer> getSelectCondition() {
        return isSelect;
    }
    //设置点击事件的接口
    private RBandETtest_Adapter.ItemClickListener mItemClickListener;

    public interface ItemClickListener {
        void onItemClick(int position);
    }

    public void setOnItemClickListener(RBandETtest_Adapter.ItemClickListener itemClickListener) {
        this.mItemClickListener = itemClickListener;
    }

    public String returnRadioButtonText() {
        String ss = "";
        ss = b;
        return ss;
    }
    String b;
    // 由于RecyclerView的onBindViewHolder()方法，只有在getItemViewType()返回类型不同时才会调用，
    // 这点是跟ListView的getView()方法不同的地方，所以如果想要每次都调用onBindViewHolder()刷新item数据，
    // 就要重写getItemViewType()，让其返回position，否则很容易产生数据错乱的现象。
    @Override
    public int getItemViewType(int position) {
        return position;
    }

    @Override
    public void onBindViewHolder(final ViewHolder holder, final int position) {
        try {
            if (isSelect.get(position) == 0) {
                holder.radioButton_No.setChecked(true);
            } else if (isSelect.get(position) == 1) {
                holder.radioButton_Yes.setChecked(true);
            } else {
                holder.radioGroup.clearCheck();
            }
            Log.e("-------------------" + String.valueOf(position), String.valueOf(isSelect.get(position)));
            //每一次都要重新加载radioButton的选中值
            holder.radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(RadioGroup radioGroup, int i) {
                    layoutPosition = holder.getLayoutPosition();
                    mItemClickListener.onItemClick(i);
                    if (radioGroup.getCheckedRadioButtonId() == R.id.RadioButton_Yes) {
                        b = "是";
                    } else if (radioGroup.getCheckedRadioButtonId() == R.id.RadioButton_No) {
                        b = "否";
                    } else {
                        b = "未选择";
                    }
                    setSelectCondition(position);
                }
            });
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    @Override
    public int getItemCount() {
        return mRBandETtestList.size();
    }
}

2)布局item代码，很简单只有一组RadioButton，MainActivity中我是循环了150组

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="wrap_content"
    >
    <RadioGroup
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:id="@+id/radioGroup">
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/RadioButton_Yes"
            android:text="是"/>
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/RadioButton_No"
            android:text="否"/>
    </RadioGroup>
</LinearLayout>

3)MainActivity中的代码

package com.example.administrator.radiobutton_test_1;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.util.SparseBooleanArray;
import android.view.View;
import android.widget.Button;

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

public class MainActivity extends AppCompatActivity {

    RecyclerView recyclerView;
    public List<RBandETtest> rBandETtestList = new ArrayList<>();
    RBandETtest_Adapter rBandETtest_adapter;
    ArrayList<RBandETtest> selectlist;
    Button button;
    SparseBooleanArray sparseBooleanArray;
    HashMap<Integer,Integer> isSelect;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recyclerView = (RecyclerView) findViewById(R.id.RecyclerView);
        button=(Button)findViewById(R.id.button);
        iniData();
        selectlist = new ArrayList<>();
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(linearLayoutManager);
        rBandETtest_adapter = new RBandETtest_Adapter(rBandETtestList);
        recyclerView.setAdapter(rBandETtest_adapter);
        rBandETtest_adapter.iniChossen();
        rBandETtest_adapter.setOnItemClickListener(new RBandETtest_Adapter.ItemClickListener() {
            @Override
            public void onItemClick(int position) {
                String ss=rBandETtest_adapter.returnRadioButtonText();
            }
        });
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                isSelect=rBandETtest_adapter.getSelectCondition();
                String s1="是";
                String s2="否";
                for (int i = 0; i < isSelect.size(); i++) {
                    if (isSelect.get(i)==0){
                        Log.e("--------------"+i, s2 );
                    }else if (isSelect.get(i)==1){
                        Log.e("--------------"+i, s1 );
                    }else {
                        Log.e("--------------"+i, "未选择" );
                    }

                }
            }
        });
    }
    public void iniData() {
        for (int i = 0; i < 150; i++) {
            RBandETtest rbet = new RBandETtest("123");
            rBandETtestList.add(rbet);
        }
    }
}

4)父布局代码

<?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:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.administrator.radiobutton_test_1.MainActivity">


    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <android.support.v7.widget.RecyclerView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/RecyclerView" />
    </FrameLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true">
        <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/button"
        android:text="获取选中项"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />
    </LinearLayout>


</RelativeLayout>

代码比较简单，是我专门做的一个测试demo，有需要的可以尝试迁移到自己的项目中去，欢迎交流

下面是一个demo的链接

防止RecyclerView滑动出现数据错乱包括RadioButton，EditText

AndroidStudio RecyclerView史上最详解

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