如何在recyclerview中为cardview android设置带有int数组的onclicklistener

Posted 2023-04-18

【中文标题】如何在recyclerview中为cardview android设置带有int数组的onclicklistener

【英文标题】：how to set onclicklistener with int array in recyclerview for cardview android

【发布时间】：2021-11-28 21:49:40

【问题描述】：

我想使用 if else 语句单击 Cardview 项目并打算进行其他活动。请帮忙。

MainActivity.java

公共类 MainActivity 扩展 AppCompatActivity

private RecyclerView imagesRV;
private int[] images = R.drawable.image01, R.drawable.image02, R.drawable.image03, R.drawable.image04, R.drawable.image05, R.drawable.image06, R.drawable.image07, R.drawable.image08;
private RecyclerViewAdapter imageAdapter;
//private ArrayList<String> imagePaths;


@Override
protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_home_page);


    imagesRV = (RecyclerView) findViewById(R.id.idRVImages);

    prepareRecyclerView();


private void prepareRecyclerView() 
    imageAdapter = new RecyclerViewAdapter(MainActivity.this, images);

    GridLayoutManager manager = new GridLayoutManager(MainActivity.this, 2);

    imagesRV.setLayoutManager(manager);
    imagesRV.setAdapter(imageAdapter);

RecyclerViewAdapter.java

公共类 RecyclerViewAdapter 扩展 RecyclerView.Adapter

private final Context context;
private final int[] imagePathArrayList;

public RecyclerViewAdapter(Context context, int[] imagePathArrayList) 
    this.context = context;
    this.imagePathArrayList = imagePathArrayList;


@NonNull
@Override
public RecyclerViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) 
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardview, parent, false);

    return  new RecyclerViewHolder(view);


@Override
public void onBindViewHolder(@NonNull RecyclerViewHolder holder, int position) 
    int imageId = imagePathArrayList[position];

        Picasso.get().load(imageId).placeholder(R.drawable.ic_launcher_background).into(holder.imageIV);

        holder.itemView.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 
                    
            
        );
        


@Override
public int getItemCount() 
    return imagePathArrayList.length;


public static class RecyclerViewHolder extends RecyclerView.ViewHolder 

    private final ImageView imageIV;

    public RecyclerViewHolder(@NonNull View itemView) 
        super(itemView);

        imageIV = itemView.findViewById(R.id.idIVImage);
    

【参考方案1】：

创建接口：

 public interface MyOnClick 
     void onClick(int imageId);
 

向构造函数添加对 MyOnClick 的引用

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.RecyclerViewHolder> 
    ...
    private final MyOnClick myOnClick;

    public RecyclerViewAdapter(Context context, int[] imagePathArrayList, MyOnClick myOnClick) 
        this.context = context;
        this.imagePathArrayList = imagePathArrayList;
        this.myOnClick = myOnClick
    
    ...
    @Override
    public void onBindViewHolder(@NonNull RecyclerViewHolder holder, int position) 
        final int imageId = imagePathArrayList[position];
        Picasso.get().load(imageId).placeholder(R.drawable.ic_launcher_background).into(holder.imageIV);

        holder.itemView.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 
                myOnClick.onClick(imageId)
            
        );
    

将 MyOnClick 传递给适配器

 public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.RecyclerViewHolder> 
     private RecyclerView imagesRV;
     private int[] images = R.drawable.image01, R.drawable.image02, R.drawable.image03, R.drawable.image04, R.drawable.image05, R.drawable.image06, R.drawable.image07, R.drawable.image08;
     private RecyclerViewAdapter imageAdapter;
     //private ArrayList<String> imagePaths;

     @Override
     protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home_page);
        imagesRV = (RecyclerView) findViewById(R.id.idRVImages);
        prepareRecyclerView();
     

     private void prepareRecyclerView() 
         imageAdapter = new RecyclerViewAdapter(this, images, new MyOnClick() 
             @Override
             public void onClick(int imageId) 
                 // Your action
             
         );

         GridLayoutManager manager = new GridLayoutManager(MainActivity.this, 2);

         imagesRV.setLayoutManager(manager);
         imagesRV.setAdapter(imageAdapter);