Android 为什么“我的回收者”视图会选择错误的项目以及单击的选定项目？

为什么“我的回收者”视图会选择错误的项目以及单击的选定项目？

我想将RecycleView放置在单击事件时启动的弹出式活动中，RecycleView应更改视图中选定项目的背景。我使用下面的活动代码使其弹出

弹出式活动代码

My Recycler视图适配器的代码如下

    public class PopUp extends Activity {
    public  int counter=0;
    private int mItemSelected=-1;
    public List<student> students=new ArrayList<student>();
    public RecyclerView recyclerView;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //to set content view for that activity
         setContentView(R.layout.popup);
        //end of the setting the layout for the activity

        //this is mechanism to calculate the width and height of the screen
        DisplayMetrics metrics=new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);
        float width=metrics.widthPixels*8/10;
        float  height=metrics.heightPixels*6/10;
        getWindow().setLayout((int)width, (int) height);
        //end of the mechanism

        //the method to populate the list
        populateList();
        //end of the method

        //now creating the recycler view
           recyclerView=(RecyclerView) findViewById(R.id.my_recycler_view);
        recyclerView.setHasFixedSize(true);
        // use a linear layout manager
     LinearLayoutManager mLayoutManager = new 
    LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false);
        recyclerView.setLayoutManager(mLayoutManager);
       MyAdapter adapter=new MyAdapter(students);
        recyclerView.setAdapter(adapter);
        //end of the recycler view

    }

    //this is event for the ok button
     public void Ok(View view){

     }
    //end of the ok button for the pop activity

    //this is event for the button  named as cancel
    public void Cancel(View view){

    }
    //end of the cancel button event

    //this is method for printing line
     public void PrintLine(String line){
         Toast.makeText(getApplicationContext(),line,Toast.LENGTH_SHORT).show();
     }
    //end of the method



    //this method to populate the ArrayList
      public void populateList(){
          String name="Mashhood Qadeer Bhatti";
          String address="Sammundri Faisalabad";
          boolean status=false;
          for(int i=0; i<10; i++){
              students.add(new student(name+"\t"+i,address,status));
          }
      }
    //end of the method


    //this is section for recycler adapter
    public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
        private List<student> values;
                //this is constructor
                public MyAdapter(List<student> myDataset) {
                    values = myDataset;
                }

        //end of the constructor

        @Override
        public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            LayoutInflater inflater = LayoutInflater.from(
                    parent.getContext());
            View v = inflater.inflate(R.layout.row_layout, parent, false);
            // set the view's size, margins, paddings and layout parameters
            ViewHolder vh = new ViewHolder(v);
            return vh;
        }

        @Override
        public void onBindViewHolder(final ViewHolder holder, final int position) {

                 holder.name.setText(values.get(position).getName().toString());
                 holder.address.setText(values.get(position).getAddress().toString());
                 holder.status.setSelected(values.get(position).getSelction());
                 holder.name.setOnClickListener(new View.OnClickListener() {
                     @Override
                     public void onClick(View v) {
                      if(mItemSelected==position){
                          v.setBackground(getResources().getDrawable(R.drawable.im));
                          PrintLine("The position matched"+position);
                          values.get(position).setSelction(!values.get(position).getSelction());
                          holder.status.setChecked(values.get(position).getSelction());
                      }
                     }
                 });
        }

        @Override
        public int getItemCount() {
            return values.size();
        }

        //there will be view holder
        public class ViewHolder extends RecyclerView.ViewHolder {
            // each data item is just a string in this case
            public TextView name;
            public TextView address;
            public View layout;
            public RadioButton status;

            public ViewHolder(View v) {
                 super(v);
                 layout = v;
                 name = (TextView) v.findViewById(R.id.name);
                 address = (TextView) v.findViewById(R.id.address);
                 status=(RadioButton) v.findViewById(R.id.status);
              layout.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        notifyDataSetChanged();
                        mItemSelected=getAdapterPosition();
                    }
                });
                /*  v.setOnClickListener(new View.OnClickListener() {
                      @Override
                      public void onClick(View v) {
                                mItemSelected=getAdapterPosition();
                                PrintLine("This is position for the"+getAdapterPosition());
                                notifyDataSetChanged();
                                values.get(mItemSelected).setSelction(!values.get(mItemSelected).getSelction());
                      }
                  });*/

            }
        }

        //end of the view holder


}
//end of that section
}

公共类弹出窗口扩展活动{
公共整数计数器=0；
private int mItemSelected=-1；
public List students=new ArrayList（）；
公共回收视图回收视图；
@凌驾
创建时受保护的void（@Nullable Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
//为该活动设置内容视图的步骤
setContentView（R.layout.popup）；
//活动布局设置结束
//这是计算屏幕宽度和高度的机制
DisplayMetrics=新的DisplayMetrics（）；
getWindowManager（）.getDefaultDisplay（）.getMetrics（度量）；
浮动宽度=度量。宽度像素*8/10；
浮动高度=度量。高度像素*6/10；
getWindow（）.setLayout（（int）宽度，（int）高度）；
//机制结束
//填充列表的方法
大众主义者（）；
//方法结束
//现在创建回收器视图
recyclerView=（recyclerView）findViewById（R.id.my\u recycler\u视图）；
recyclerView.setHasFixedSize（true）；
//使用线性布局管理器
LinearLayoutManager mLayoutManager=新建
LinearLayoutManager（这是LinearLayoutManager.VERTICAL，false）；
recyclerView.setLayoutManager（mLayoutManager）；
MyAdapter=新的MyAdapter（学生）；
recyclerView.setAdapter（适配器）；
//回收器视图的结尾
}
//这是ok按钮的事件
公共无效确定（视图）{
}
//pop活动的“确定”按钮结束
//这是名为“取消”的按钮的事件
公共作废取消（查看）{
}
//取消按钮事件结束
//这是印刷线的方法
公共无效打印行（字符串行）{
Toast.makeText（getApplicationContext（），line，Toast.LENGTH_SHORT.show（）；
}
//方法结束
//此方法用于填充ArrayList
公共无效公共列表（）{
字符串名称=“Mashhood Qadeer Bhatti”；
字符串地址=“Sammundri Faisalabad”；
布尔状态=假；
对于（int i=0；i而言，recycler视图在OnBindViewHolder中回收视图。因此，当单击项目时，它会反映在一些其他位置。要解决此问题，请执行以下操作

创建一个全局变量来存储单击的位置

private int mItemSelected = -1;

然后在viewholder内部添加clickListener，然后单击存储单击项目的位置

public class ViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView name;
public TextView address;
public View layout;
public RadioButton status;

public ViewHolder(View v) {
    super(v);
    layout = v;
    name = (TextView) v.findViewById(R.id.name);
    address = (TextView) v.findViewById(R.id.address);
    status = (RadioButton) v.findViewById(R.id.status);
    v.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mItemSelected = getAdapterPosition();
            notifyDataSetChanged();

        }
    });
  }
}

而且
在BindViewHolder内

@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {

    holder.name.setText(values.get(position).getName().toString());
    holder.address.setText(values.get(position).getAddress().toString());
    holder.status.setSelected(values.get(position).getSelction());

    if(mItemSelected==position){
        holder.status.setChecked(true)‌;
        v.setBackground(getResources().getDrawable(R.drawable.im));
    }else{
        holder.status.setChecked(false)‌;
        v.setBackground(getResources().getDrawable(unselected Item));
    }
}
   

公共类弹出窗口扩展活动{
公共整数计数器=0；
private int mItemSelected=-1；
public List students=new ArrayList（）；
公共回收视图回收视图；
@凌驾
创建时受保护的void（@Nullable Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
//为该活动设置内容视图的步骤
setContentView（R.layout.popup）；
//活动布局设置结束
//这是计算屏幕宽度和高度的机制
DisplayMetrics=新的DisplayMetrics（）；
getWindowManager（）.getDefaultDisplay（）.getMetrics（度量）；
浮动宽度=度量。宽度像素*8/10；
浮动高度=度量。高度像素*6/10；
getWindow（）.setLayout（（int）宽度，（int）高度）；
//机制结束
//填充列表的方法
大众主义者（）；
//方法结束
//现在创建回收器视图
recyclerView=（recyclerView）findViewById（R.id.my\u recycler\u视图）；
recyclerView.setHasFixedSize（true）；
//使用线性布局管理器
LinearLayoutManager mllayoutmanager=新的LinearLayoutManager（此，LinearLayoutManager.VERTICAL，false）；
recyclerView.setLayoutManager（mLayoutManager）；
MyAdapter=新的MyAdapter（学生）；
recyclerView.setAdapter（适配器）；
//回收器视图的结尾
}
//这是ok按钮的事件
公共无效确定（视图）{
}
//pop活动的“确定”按钮结束
//这是名为“取消”的按钮的事件
公共作废取消（查看）{
}
//取消按钮事件结束
//这是印刷线的方法
公共无效打印行（字符串行）{
Toast.makeText（getApplicationContext（），line，Toast.LENGTH_SHORT.show（）；
}
//方法结束
//此方法用于填充ArrayList
公共无效公共列表（）{
字符串名称=“Mashhood Qadeer Bhatti”；
字符串地址=“Sammundri Faisalabad”；
布尔状态=假；
对于（int i=0；iUser holder.getAdapterPosition（）而不是提供职位。先生，如果我在学习的早期阶段写错了什么，请原谅。先生，我使用holder来获取我的ui小部件，例如，我在ViewAdapter中有一个名为status的单选按钮，因此我希望在单击时将收音机设置为选中状态，这就是我使用holder.status.setSelected（）的原因；然后为其提供反向布尔值，仅用于切换功能，以显示是否选中。先生！如果使用holder.getAdapterPosition（）它将给我适配器的id，然后如何更改它的背景。holder给我们提供了两个位置，一个是onBindViewHolderMethod中的int位置，这是在可见屏幕上的位置。另一个是holder.getAdapterPosition（）这是物品的实际位置。因此我建议您使用第二个。先生，根据您和匿名先生的建议，我已经放置了获得的位置
@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {

    holder.name.setText(values.get(position).getName().toString());
    holder.address.setText(values.get(position).getAddress().toString());
    holder.status.setSelected(values.get(position).getSelction());

    if(mItemSelected==position){
        holder.status.setChecked(true)‌;
        v.setBackground(getResources().getDrawable(R.drawable.im));
    }else{
        holder.status.setChecked(false)‌;
        v.setBackground(getResources().getDrawable(unselected Item));
    }
}
   

public class PopUp extends Activity {
    public  int counter=0;
    private int mItemSelected=-1;
    public List<student> students=new ArrayList<student>();
    public RecyclerView recyclerView;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //to set content view for that activity
         setContentView(R.layout.popup);
        //end of the setting the layout for the activity

        //this is mechanism to calculate the width and height of the screen
        DisplayMetrics metrics=new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);
        float width=metrics.widthPixels*8/10;
        float  height=metrics.heightPixels*6/10;
        getWindow().setLayout((int)width, (int) height);
        //end of the mechanism

        //the method to populate the list
        populateList();
        //end of the method

        //now creating the recycler view
           recyclerView=(RecyclerView) findViewById(R.id.my_recycler_view);
        recyclerView.setHasFixedSize(true);
        // use a linear layout manager
     LinearLayoutManager mLayoutManager = new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false);
        recyclerView.setLayoutManager(mLayoutManager);
       MyAdapter adapter=new MyAdapter(students);
        recyclerView.setAdapter(adapter);
        //end of the recycler view

    }

    //this is event for the ok button
     public void Ok(View view){

     }
    //end of the ok button for the pop activity

    //this is event for the button  named as cancel
    public void Cancel(View view){

    }
    //end of the cancel button event

    //this is method for printing line
     public void PrintLine(String line){
         Toast.makeText(getApplicationContext(),line,Toast.LENGTH_SHORT).show();
     }
    //end of the method



    //this method to populate the ArrayList
      public void populateList(){
          String name="Mashhood Qadeer Bhatti";
          String address="Sammundri Faisalabad";
          boolean status=false;
          for(int i=0; i<10; i++){
              students.add(new student(name+"\t"+i,address,status));
          }
      }
    //end of the method


    //this is section for recycler adapter
    public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
        private List<student> values;
                //this is constructor
                public MyAdapter(List<student> myDataset) {
                    values = myDataset;
                }

        //end of the constructor

        @Override
        public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            LayoutInflater inflater = LayoutInflater.from(
                    parent.getContext());
            View v = inflater.inflate(R.layout.row_layout, parent, false);
            // set the view's size, margins, paddings and layout parameters
            ViewHolder vh = new ViewHolder(v);
            return vh;
        }

        @Override
        public void onBindViewHolder(final ViewHolder holder, final int position) {

                 holder.name.setText(values.get(position).getName().toString());
                 holder.address.setText(values.get(position).getAddress().toString());
                 holder.status.setSelected(values.get(position).getSelction());
                 if(values.get(position).getSelction()) {
                   holder.layout.setBackground(getResources().getDrawable(R.drawable.im));
                 }
                 else{
                     holder.layout.setBackground(getResources().getDrawable(R.drawable.imagee));
                 }
        }

        @Override
        public int getItemCount() {
            return values.size();
        }

        //there will be view holder
        public class ViewHolder extends RecyclerView.ViewHolder {
            // each data item is just a string in this case
            public TextView name;
            public TextView address;
            public View layout;
            public RadioButton status;

            public ViewHolder(View v) {
                 super(v);
                 layout = v;
                 name = (TextView) v.findViewById(R.id.name);
                 address = (TextView) v.findViewById(R.id.address);
                 status=(RadioButton) v.findViewById(R.id.status);
                v.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                      //  mItemSelected = getAdapterPosition();
                        try{
                            PrintLine("The adapter position "+getAdapterPosition());
                            Boolean current_value=values.get(getAdapterPosition()).getSelction();
                            values.get(getAdapterPosition()).setSelction(!current_value);
                            notifyDataSetChanged();
                        }
                       catch(Exception ex){
                        PrintLine("Exception of type"+ex.getMessage());
                       }
                    }
                });

            }
        }

        //end of the view holder


}
//end of that section
}