将值从回收器适配器传递到android中的片段

Posted 2023-04-18

【中文标题】将值从回收器适配器传递到android中的片段

【英文标题】：passing values from recycler adapter to fragment in android

【发布时间】：2018-09-09 11:47:14

【问题描述】：

我有一个回收器适配器，我为适配器中的项目添加了setOnClickListener。代码如下：

@Override
    public void onBindViewHolder(final FiltersAdapter.MyViewHolder holder, final int position) 
        holder.mOrganizer.setText(filtersList.get(position));
        holder.mLayout.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 

                try 
                    //Log.e("message","ONclick FIlter");
                    if (holder.mOrganizerCheck.isChecked())
                        holder.mOrganizerCheck.setChecked(false);
                    else 
                        holder.mOrganizerCheck.setChecked(true);
                        int pos = holder.getAdapterPosition();

                        filtersList.get(pos);

                        /*Bundle bundle = new Bundle();
                        bundle.putInt(pos, );*/

                        Log.d(TAG, "onClick: " +filtersList);
                        Log.d(TAG, "onClick of position: " +pos);

                    
                 catch (Exception e) 
                    e.printStackTrace();
                
            
        );  

这是处理从适配器到片段获取值的片段代码。

private void initView() 
        mrvFilterBySender = (RecyclerView) mFilterView.findViewById(R.id.rvFilterBySender);
        mFiltersAdapter = new FiltersAdapter(getActivity(), mListOrganizer);
        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getContext());
        mrvFilterBySender.setLayoutManager(mLayoutManager);

        mrvFilterBySender.setAdapter(mFiltersAdapter);
        mFiltersAdapter.notifyDataSetChanged();

        mrvFilterBySender.setAdapter(mFiltersAdapter);
        mrvFilterBySender.setRecyclerListener(new RecyclerView.RecyclerListener() 
            @Override
            public void onViewRecycled(RecyclerView.ViewHolder holder) 
                holder.getAdapterPosition();
            
        );

      

我正在尝试将pos 和具有pos 的值从适配器传递到片段。但是我的代码不起作用。我该如何解决？

【问题讨论】：

错误日志是什么？

也许你应该使用接口？

***.com/questions/46160295/…

onViewRecycled 不会返回点击的位置，因为这个方法不是为了那个

你应该使用接口来获取项目的位置。 RecyclerView.Adapter 没有像 Listview 这样的 onItemClickListener。

【参考方案1】：

将点击事件处理成recyclerview的接口.. 下面的代码用于处理点击事件。

onItemClickListner onItemClickListner;

public void setOnItemClickListner(RecyclerViewAdpater.onItemClickListner onItemClickListner) 
    this.onItemClickListner = onItemClickListner;


public interface onItemClickListner
    void onClick(String str);//pass your object types.

   @Override
public void onBindViewHolder(ItemViewHolder holder, int position) 
    String data=mStringList.get(position); // if you pass object of class then create that class object.
    holder.textView.setText(data);
    holder.itemView.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View view) 
            onItemClickListner.onClick(data);
        
    );
 

然后当你将适配器绑定到RecyclerView 调用下面的代码之后..

mRvData.setLayoutManager(new LinearLayoutManager(this));
mRvData.setAdapter(recyclerViewAdpater);
recyclerViewAdpater.notifyDataSetChanged();
recyclerViewAdpater.setOnItemClickListner(new RecyclerViewAdpater.onItemClickListner() 
    @Override
    public void onClick(String str) 
        Toast.makeText(getApplicationContext(), str, Toast.LENGTH_LONG).show();
    
);

【参考方案2】：

在你的适配器中创建一个接口

public interface OnItemClickListener 
  void onItemClicked(int position, Object object);

在您的适配器调用中

Adapter adapter = new Adapter(context, list, new Adapter.OnItemClickListener() 
            @Override
            public void onItemClicked(int position, Object object) 
                  // Handle Object of list item here
            
        );

在您的适配器上

private OnItemClickListener onItemClickListener; // Global scope 

在构造函数调用中：

this.onItemClickListener = onItemClickListener;

关于您的项目点击事件：

itemView.setOnClickListener(new View.OnClickListener() 
    @Override
    public void onClick(View view) 
      onItemClickListener.onItemClicked(position, _list.get(position));
    
);

【讨论】：

这行得通，谢谢...为了更清晰的解释

非常感谢！！快乐编码！

【参考方案3】：

请使用如下接口，将其传递到适配器的构造函数中，然后在您的活动/片段中使用它

   public MyAdapter(Context context, List<Object> data, MyAdapterListener myAdapterListener) 
             this.context = context;
             this.data = data;
              this.myAdapterListener = myAdapterListener;
        

        public interface MyAdapterListener 

    void onContainerClick(View view, int position); 
    

     

    public class ViewHolderItem extends RecyclerView.ViewHolder implements View.OnClickListener 
        public LinearLayout container;

        public ImageView poster;

        public ViewHolderItem(View v) 
            super(v);

            container = (LinearLayout) v.findViewById(R.id.container);

            poster = (ImageView) v.findViewById(R.id.poster);

            container =setOnClickListener(this); /// this line must include
        

        @Override
        public void onClick(View v) 
            int id = v.getId();

            if (id == R.id.container) 
               if (myAdapterListener != null) 
    myAdapterListener.onContainerClick(v,getAdapterPosition());
                
            
        
    

在您的片段/活动中像这样使用它

mAdapter = new MyAdapter(getApplicationContext() , data, new MyAdapter.MyAdapterListener() 
                    @Override
                    public void onContainerClick(View v, int position) 
                        Log.d(TAG, "iconTextViewOnClick at position "+position);
                    

                );
mRecycler.setAdapter(mAdapter);

【参考方案4】：

我觉得这对你有用

添加你的适配器

    public interface ClickEvent 
        void clickEventItem(int position,String value);
    

    ClickEvent clickevent;


    public void setClickEvent(ClickEvent event) 
        this.clickevent = event;
    

   itemView.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View view) 
            clickevent.clickEventItem(position, list.get(position));
        
    );

在您的片段集界面中

adapter.setClickEvent(你的类上下文);

实现ClickEvent接口并生成@Override方法

  @Override
  public void clickEventItem(int position,String value) 
       //write your code here