Java 在RecyclerView的单个接口中使用多个onClick方法

上下文：

public interface OnTaskListener {
    void onTaskClick(int position); // Interfaces are implicitly abstract
    void onTaskLongClick(int position);
}

public class itemViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener {

    View itmView; // This is the general view
    TextView txtView; // This is the specific text view that shows up as a singular task in the list of to-do tasks
    OnTaskListener onTaskListener; // Create an OnTaskListener inside our view holder which allows the view holder to realize it's been clicked

    public itemViewHolder(@NonNull View itemView, OnTaskListener inputOnTaskListener) {
        super(itemView);
        itmView = itemView;
        txtView = itemView.findViewById(R.id.txtTask);
        this.onTaskListener = inputOnTaskListener; // Take an onTaskListener that is passed into the object and store it internally
        itemView.setOnClickListener(this); // passes the View.OnClickListener context to the itemView via "this"
    }

    @Override
    public void onClick(View view) {
        onTaskListener.onTaskClick(getAdapterPosition()); // This says that whenever we register a click event, we pass the logic onto the taskClick event
    }

    @Override
    public boolean onLongClick(View view) {
        onTaskListener.onTaskLongClick(getAdapterPosition()); // This says that whenever we register a longClick event, we pass the logic onto the taskClick event
        return true; // This means that we have successfully consumed the long click event. No other click events will be notified
    }
}

我在我的待办事项列表应用程序中实现了一个RecyclerView

我希望能够对RecyclerView中的项使用各种onClick方法，因此我创建了一个名为onTaskListener的接口

此接口有两个方法存根，一个用于onClick，另一个用于onLongClick。在我的ViewHolder中，我实现了onClick（）和onLongClick（）方法，它们只是将控制权传递给我的onTaskClickListener（）

在适配器中，我创建了一个onTaskClickListener（）。 然后，在我的主要活动中，我实现了onTaskClickListener（）中的方法

我的问题是，虽然我的onTaskClick（）工作得很好，但我的onTaskLongClick似乎根本不起作用。我设置RecyclerView/Adapter/ViewHolder/ViewModel模式的方式是否有问题

问题：如果我实现界面的方式不正确，我如何在一个界面中包含多种类型的点击事件

以下是每个文件的相关内容（我知道这是很多，我很抱歉代码墙）：

onTaskClickListener.java:

public interface OnTaskListener {
    void onTaskClick(int position); // Interfaces are implicitly abstract
    void onTaskLongClick(int position);
}

public class itemViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener {

    View itmView; // This is the general view
    TextView txtView; // This is the specific text view that shows up as a singular task in the list of to-do tasks
    OnTaskListener onTaskListener; // Create an OnTaskListener inside our view holder which allows the view holder to realize it's been clicked

    public itemViewHolder(@NonNull View itemView, OnTaskListener inputOnTaskListener) {
        super(itemView);
        itmView = itemView;
        txtView = itemView.findViewById(R.id.txtTask);
        this.onTaskListener = inputOnTaskListener; // Take an onTaskListener that is passed into the object and store it internally
        itemView.setOnClickListener(this); // passes the View.OnClickListener context to the itemView via "this"
    }

    @Override
    public void onClick(View view) {
        onTaskListener.onTaskClick(getAdapterPosition()); // This says that whenever we register a click event, we pass the logic onto the taskClick event
    }

    @Override
    public boolean onLongClick(View view) {
        onTaskListener.onTaskLongClick(getAdapterPosition()); // This says that whenever we register a longClick event, we pass the logic onto the taskClick event
        return true; // This means that we have successfully consumed the long click event. No other click events will be notified
    }
}

itemViewHolder.java:

public interface OnTaskListener {
    void onTaskClick(int position); // Interfaces are implicitly abstract
    void onTaskLongClick(int position);
}

public class itemViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener {

    View itmView; // This is the general view
    TextView txtView; // This is the specific text view that shows up as a singular task in the list of to-do tasks
    OnTaskListener onTaskListener; // Create an OnTaskListener inside our view holder which allows the view holder to realize it's been clicked

    public itemViewHolder(@NonNull View itemView, OnTaskListener inputOnTaskListener) {
        super(itemView);
        itmView = itemView;
        txtView = itemView.findViewById(R.id.txtTask);
        this.onTaskListener = inputOnTaskListener; // Take an onTaskListener that is passed into the object and store it internally
        itemView.setOnClickListener(this); // passes the View.OnClickListener context to the itemView via "this"
    }

    @Override
    public void onClick(View view) {
        onTaskListener.onTaskClick(getAdapterPosition()); // This says that whenever we register a click event, we pass the logic onto the taskClick event
    }

    @Override
    public boolean onLongClick(View view) {
        onTaskListener.onTaskLongClick(getAdapterPosition()); // This says that whenever we register a longClick event, we pass the logic onto the taskClick event
        return true; // This means that we have successfully consumed the long click event. No other click events will be notified
    }
}

dataAdapter.java

public class dataAdapter extends RecyclerView.Adapter<itemViewHolder> {

    List<taskItem> taskItemList;
    private OnTaskListener onTaskListener;

    public dataAdapter(List<taskItem> inputTaskItemList, OnTaskListener inputOnTaskListener){
        this.taskItemList = inputTaskItemList;
        this.onTaskListener = inputOnTaskListener;
    }

    @NonNull
    @Override
    public itemViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View localView = LayoutInflater.from(parent.getContext()).inflate(R.layout.taskholder, parent, false); //Don't even know what this line does, it's all so over my head
        return new itemViewHolder(localView, onTaskListener); // Return an instance of whatever we made directly above this line
    }

    @Override
    public void onBindViewHolder(@NonNull itemViewHolder holder, final int position) {
        holder.txtView.setText(taskItemList.get(position).taskTitle);
        // Look inside our ViewModel and get the text for this specific instance of the ViewModel, which corresponds to the current position
    }

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

public class MainActivity extends AppCompatActivity implements OnTaskListener{
    private RecyclerView taskList; // Creates a RecyclerView to hook up to our RecyclerView widget in the UI
    private dataAdapter localAdapter; // Instantiates our custom adapter class
    List<taskItem> myItems; // Stores the items in a list of taskItem's
    private RecyclerView.LayoutManager localLayoutManager; // God knows what this does :(

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

        taskList = findViewById(R.id.taskList); // Connects our list from UI to recycler view code
        localLayoutManager = new LinearLayoutManager(this); // assigns our localLayoutManager to an actual Layout Manager
        taskList.setLayoutManager(localLayoutManager); // connecting our layout manager to our recycler view
        taskList.setHasFixedSize(true);

        myItems = new ArrayList<>(); // Now we FINALLY make our to-do list and populate it with actual tasks
        myItems.add(new taskItem("groceries"));
        myItems.add(new taskItem("practice bjj"));

        localAdapter = new dataAdapter(myItems, this); // Pass the to do list to the adapter so it can feed it to the recycler view
        taskList.setAdapter(localAdapter); // Lastly set the recycler view's adapter to the one we made above
        
    }

    @Override
    public void onTaskClick(int position) {
        taskItem currentTask = myItems.get(position);
        if(!(currentTask.taskTitle.startsWith("Done: "))){ // Logic that marks a task as done on tap
            currentTask.taskTitle = "Done: " + currentTask.taskTitle;
            //logic that moves the tapped item to bottom of list
            myItems.remove(position);
            myItems.add(myItems.size(), currentTask);
            localAdapter.notifyItemMoved(position, myItems.size());
        }
        else if(myItems.get(position).taskTitle.startsWith("Done: ")){ // Logic for if user taps a task already marked "done"
            currentTask.taskTitle = currentTask.taskTitle.replaceFirst("Done: ", "");
            myItems.set(position, currentTask); // Remove prefix
            localAdapter.notifyItemChanged(position);
            myItems.remove(position);
            myItems.add(0, currentTask);
        }
        localAdapter.notifyDataSetChanged(); // Let the activity know that the data has changed
    }

    @Override
    public void onTaskLongClick(int position) { // This branch deals with deleting tasks on long click
        myItems.remove(position);
        localAdapter.notifyItemRemoved(position); // Item has been deleted
    }
}

公共类dataAdapter扩展了RecyclerView.Adapter{
列表任务项列表；
私有OnTaskListener OnTaskListener；
公共数据适配器（列表inputaskitemlist、OnTaskListener inputOnTaskListener）{
this.taskItemList=inputaskitemlist；
this.onTaskListener=inputOnTaskListener；
}
@非空
@凌驾
public itemViewHolder onCreateViewHolder（@NonNull ViewGroup父级，int viewType）{
View localView=LayoutInflater.from（parent.getContext（））.inflate（R.layout.taskholder，parent，false）；//我甚至不知道这行是干什么的，我都想不通了
return new itemViewHolder（localView，onTaskListener）；//返回我们在这一行上直接创建的任何内容的实例
}
@凌驾
public void onBindViewHolder（@NonNull itemViewHolder，final int位置）{
holder.txtView.setText（taskItemList.get（position.taskTitle））；
//查看ViewModel内部，获取ViewModel的此特定实例的文本，该实例对应于当前位置
}
@凌驾
public int getItemCount（）{
返回taskItemList.size（）；
}
}

MainActivity.java

public class dataAdapter extends RecyclerView.Adapter<itemViewHolder> {

    List<taskItem> taskItemList;
    private OnTaskListener onTaskListener;

    public dataAdapter(List<taskItem> inputTaskItemList, OnTaskListener inputOnTaskListener){
        this.taskItemList = inputTaskItemList;
        this.onTaskListener = inputOnTaskListener;
    }

    @NonNull
    @Override
    public itemViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View localView = LayoutInflater.from(parent.getContext()).inflate(R.layout.taskholder, parent, false); //Don't even know what this line does, it's all so over my head
        return new itemViewHolder(localView, onTaskListener); // Return an instance of whatever we made directly above this line
    }

    @Override
    public void onBindViewHolder(@NonNull itemViewHolder holder, final int position) {
        holder.txtView.setText(taskItemList.get(position).taskTitle);
        // Look inside our ViewModel and get the text for this specific instance of the ViewModel, which corresponds to the current position
    }

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

public class MainActivity extends AppCompatActivity implements OnTaskListener{
    private RecyclerView taskList; // Creates a RecyclerView to hook up to our RecyclerView widget in the UI
    private dataAdapter localAdapter; // Instantiates our custom adapter class
    List<taskItem> myItems; // Stores the items in a list of taskItem's
    private RecyclerView.LayoutManager localLayoutManager; // God knows what this does :(

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

        taskList = findViewById(R.id.taskList); // Connects our list from UI to recycler view code
        localLayoutManager = new LinearLayoutManager(this); // assigns our localLayoutManager to an actual Layout Manager
        taskList.setLayoutManager(localLayoutManager); // connecting our layout manager to our recycler view
        taskList.setHasFixedSize(true);

        myItems = new ArrayList<>(); // Now we FINALLY make our to-do list and populate it with actual tasks
        myItems.add(new taskItem("groceries"));
        myItems.add(new taskItem("practice bjj"));

        localAdapter = new dataAdapter(myItems, this); // Pass the to do list to the adapter so it can feed it to the recycler view
        taskList.setAdapter(localAdapter); // Lastly set the recycler view's adapter to the one we made above
        
    }

    @Override
    public void onTaskClick(int position) {
        taskItem currentTask = myItems.get(position);
        if(!(currentTask.taskTitle.startsWith("Done: "))){ // Logic that marks a task as done on tap
            currentTask.taskTitle = "Done: " + currentTask.taskTitle;
            //logic that moves the tapped item to bottom of list
            myItems.remove(position);
            myItems.add(myItems.size(), currentTask);
            localAdapter.notifyItemMoved(position, myItems.size());
        }
        else if(myItems.get(position).taskTitle.startsWith("Done: ")){ // Logic for if user taps a task already marked "done"
            currentTask.taskTitle = currentTask.taskTitle.replaceFirst("Done: ", "");
            myItems.set(position, currentTask); // Remove prefix
            localAdapter.notifyItemChanged(position);
            myItems.remove(position);
            myItems.add(0, currentTask);
        }
        localAdapter.notifyDataSetChanged(); // Let the activity know that the data has changed
    }

    @Override
    public void onTaskLongClick(int position) { // This branch deals with deleting tasks on long click
        myItems.remove(position);
        localAdapter.notifyItemRemoved(position); // Item has been deleted
    }
}

public类MainActivity扩展了AppCompatActivity实现了OnTaskListener{
private RecyclerView taskList；//创建一个RecyclerView以连接到UI中的RecyclerView小部件
私有dataAdapter localAdapter；//实例化自定义适配器类
List myItems；//将项目存储在taskItem的
private RecyclerView.LayoutManager localLayoutManager；//天知道这是怎么回事：(
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
taskList=findviewbyd（R.id.taskList）；//将列表从UI连接到回收器视图代码
localLayoutManager=new LinearLayoutManager（this）；//将localLayoutManager分配给实际的布局管理器
taskList.setLayoutManager（localLayoutManager）；//将布局管理器连接到回收器视图
taskList.setHasFixedSize（true）；
myItems=new ArrayList（）；//现在我们终于创建了待办事项列表，并用实际任务填充它
添加（新任务项（“杂货”）；
添加（新任务项（“实践bjj”）；
localAdapter=newdataadapter（myItems，this）；//将待办事项列表传递给适配器，以便它可以将其提供给回收器视图
taskList.setAdapter（localAdapter）；//最后将回收器视图的适配器设置为我们上面制作的适配器
}
@凌驾
公共void onTaskClick（内部位置）{
taskItem currentTask=myItems.get（位置）；
if（！（currentTask.taskTitle.startsWith（“Done:”）{//将任务标记为点击完成的逻辑
currentTask.taskTitle=“完成：”+currentTask.taskTitle；
//将点击项移动到列表底部的逻辑
myItems。移除（位置）；
添加（myItems.size（），currentTask）；
localAdapter.notifyItemMoved（位置，myItems.size（））；
}
else if（myItems.get（position.taskTitle.startsWith（“Done:”）{//if用户点击已标记为“Done”的任务的逻辑
currentTask.taskTitle=currentTask.taskTitle.replaceFirst（“完成：，”）；
myItems.set（位置，当前任务）；//删除前缀
localAdapter.notifyItemChanged（位置）；
myItems。移除（位置）；
添加（0，当前任务）；
}
localAdapter.notifyDataSetChanged（）；//让活动知道数据已更改
}
@凌驾
public void onTaskLongClick（int位置）{//此分支处理长时间单击时删除任务
myItems。移除（位置）；
localAdapter.notifyItemRemoved（位置）；//项已被删除
}
}

您从未打过电话：

或者，您可以通过内联整个

OnLongClickListener

（同样，对于

OnClickListener

），完全避免使用

此

：

---

这样就避免了让您的

itemViewHolder

类实现

OnLongClickListener

接口，并且不可能忘记调用

setOnLongClickListener（）

我真不敢相信我错过了这个。谢谢。如果发生这种情况，我有没有办法让Android Studio警告我？或者这只是一个小心的问题？将

OnClickListener

实现直接传递给

setOnClickListener（）

方法，而不是传入

此

。这样，侦听器的设置和侦听器本身就不存在了