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

Question

我想点击 Cardview 项目并使用 if else 语句进行其他活动。请帮忙。

MainActivity.java

public class 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

public class 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);
    }
}

}

Answer 1

创建界面：

 public interface MyOnClick {
     void onClick(int imageId);
 }

在构造函数中添加对 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);
     }
 }

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

how to set onclicklistener with int array in recyclerview for cardview android

java

android-studio

android-cardview

android-recyclerview