Question

我已经在Medium上阅读了关于Recyclerview的文章，并指出将听众置于onBindViewHolder内是不好的做法。

就我而言，我在其中声明了一些听众，只是为了转到下一个Activity

holder.readMoreBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //INTENT BUNDLE HERE

            }
        });

是否有其他方法可以从持有者那里获取设定数据并通过意图传递？

holder.textViewTitle.setText(doctrines.get(position).doctrineTitle);
        holder.textViewDesc.setText(doctrines.get(position).doctrineSummary);
        .
        .
        .
        .

编辑：提供修改后的完整代码

public class AdapterDoctrines扩展了RecyclerView.Adapter {

private Context mContext;
public List<ModelGreatDoctrines> doctrines;

public Intent bundleData;

public AdapterDoctrines(Context mContext, List<ModelGreatDoctrines> doctrines) {
    this.mContext = mContext;
    this.doctrines = doctrines;
}

@NonNull
@Override
public DoctrinesHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

    View viewDoctrineCard;

    LayoutInflater layoutInflaterCard;

    layoutInflaterCard = LayoutInflater.from(mContext);

    viewDoctrineCard = layoutInflaterCard.inflate(R.layout.card_doctrine,parent,false);

    return new DoctrinesHolder(viewDoctrineCard);
}

@Override
public void onBindViewHolder(@NonNull DoctrinesHolder holder, int position) {

    //ModelGreatDoctrines greatDoctrines = doctrines.get(position);




}

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

class DoctrinesHolder extends RecyclerView.ViewHolder implements View.OnClickListener{

    CardView mCardView;

    AppCompatTextView textViewTitle;

    AppCompatTextView textViewDesc;

    AppCompatButton buttonRead;

    AppCompatButton buttonDownload;

    public DoctrinesHolder(View itemView) {
        super(itemView);

        mCardView = itemView.findViewById(R.id.card_great_doctrine);
        mCardView.setOnClickListener(this);

        textViewTitle = itemView.findViewById(R.id.card_doctrine_title);
        textViewDesc = itemView.findViewById(R.id.card_doctrine_desc);

        buttonRead = itemView.findViewById(R.id.card_doctrine_read);
        buttonRead.setOnClickListener(this);

        buttonDownload = itemView.findViewById(R.id.card_doctrine_download);
        buttonDownload.setOnClickListener(this);

    }

    @Override
    public void onClick(View view) {

        int id = view.getId();
        switch (id){
            case R.id.card_great_doctrine:

                break;

            case R.id.card_doctrine_read:
                //INTENT BUNDLE EXTRA - NEXT ACTIVITY

                break;


            case R.id.card_doctrine_download:
                //PERFORM DOWNLOAD USING DOWNLOAD MANAGER

                break;

        }

    }

    //BUNDLE INTENT
    public void intentBundle(){
        bundleData = new Intent(mContext,ViewerDoctrineActivity.class);

        // GET data from Holder

        bundleData.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_CLEAR_TOP);
        mContext.startActivity(bundleData);
    }

}

Answer 1

您可以使用此方法从ViewHolder课程中获取数据包中的数据。

首先，创建自己的onClickListener类（可以在ViewHolder类中执行此操作）：

  public class RecyclerViewItemClickListener implements View.OnClickListener{
    private ModelGreatDoctrines doctrine;

    RecyclerViewItemClickListener(ModelGreatDoctrines doctrine){
      this.doctrine = doctrine;
    }

    @Override
    public void onClick(View view) {
      int id = view.getId();
      switch (id){
        case R.id.card_great_doctrine:

          break;

        case R.id.card_doctrine_read:
          intentBundle(doctrine);
          break;


        case R.id.card_doctrine_download:
          //PERFORM DOWNLOAD USING DOWNLOAD MANAGER

          break;

      }
    }
  }

其次，更新ViewHolder类的代码：

class DoctrinesHolder extends RecyclerView.ViewHolder{

CardView mCardView;

AppCompatTextView textViewTitle;

AppCompatTextView textViewDesc;

AppCompatButton buttonRead;

AppCompatButton buttonDownload;

public DoctrinesHolder(View itemView) {
super(itemView);
    ModelGreatDoctrines greatDoctrines = doctrines.get(getAdapterPosition());
    RecyclerViewItemClickListener itemClickListener = new RecyclerViewItemClickListener(greatDoctrines)
    mCardView = itemView.findViewById(R.id.card_great_doctrine);
    mCardView.setOnClickListener(itemClickListener);

    textViewTitle = itemView.findViewById(R.id.card_doctrine_title);
    textViewDesc = itemView.findViewById(R.id.card_doctrine_desc);

    buttonRead = itemView.findViewById(R.id.card_doctrine_read);
    buttonRead.setOnClickListener(itemClickListener);

    buttonDownload = itemView.findViewById(R.id.card_doctrine_download);
    buttonDownload.setOnClickListener(itemClickListener);

     }
}

第三，将方法intentBundle更改为接受ModelGreatDoctrines作为参数：

//BUNDLE INTENT
public void intentBundle(ModelGreatDoctrines doctrine){
    bundleData = new Intent(mContext,ViewerDoctrineActivity.class);

    // GET data from Holder

    bundleData.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_CLEAR_TOP);
    mContext.startActivity(bundleData);
}

现在你的intentBundle方法中有你当前的学说，所以你可以用它来获取数据

Answer 2

首先创建一个界面 -

public interface ItemClickListener {

    void onItemClick(int pos);
}

现在，在你的适配器类中声明一个实现interface-

的内部公共类MyViewHolder

public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

    private ItemClickListener itemClickListener;

    public MyViewHolder(View itemView) {
        super(itemView);
    }

    public void setItemClickListener(ItemClickListener itemClickListener) {
        this.itemClickListener = itemClickListener;
        itemView.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        this.itemClickListener.onItemClick(this.getLayoutPosition());
    }
}

然后，在你的onBindViewHolder中，你可以像下面一样实现setItemClickListener方法并传递数据 -

holder.setItemClickListener(new ItemClickListener() {
        @Override
        public void onItemClick(int pos) {

              Intent intent = new Intent(context, NewActivity.class);
              intent.putExtra("data_name", "your data");
              context.startActivity(intent);
        }
    });

如何获取Holder数据并正确传递意图？

2 个答案: