java - 如何处理 RecyclerView 项目 onClick，如果它对多个 Activity 使用单个适配器类

Question

**我正在为两个不同的 Activity (VocabularyActivity 和 PracticeActivity)使用单个 MyAdapter 类。我想为两个 Activity 中定义的不同项目 onClick 打开不同的 Intent。我也附上了我的代码。我正在尝试为项目 onClick 使用 Activity (VocabularyActivity 和 PracticeActivity)的上下文，但无法实现它。请指导我完成这个。 **

 //MyAdapter.java

package com.example.pkjha.recyclerview;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.List;

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {

    private List<ListItem> listItems;
    private Context context;

    public MyAdapter(List<ListItem> listItems, Context context) {
        this.listItems = listItems;
        this.context = context;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View v= LayoutInflater.from(parent.getContext()).inflate(R.layout.listitem_recyclerview,parent,false);
        return new ViewHolder(v);
    }



   @Override
    public void onBindViewHolder(@NonNull ViewHolder viewHolder, int position) {

        ListItem listItem=listItems.get(position);
        viewHolder.textViewHeader.setText(listItem.getFirstText());
        viewHolder.textViewDescription.setText(listItem.getSecondText());
    }




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




    public class ViewHolder extends RecyclerView.ViewHolder
    {
        public TextView textViewHeader,textViewDescription;
        public ViewHolder(@NonNull View itemView) {
            super(itemView);

            textViewDescription=itemView.findViewById(R.id.firstText);
            textViewHeader=itemView.findViewById(R.id.secondText);
        }
    }
}

//VocabularyActivity.java


   package com.example.pkjha.recyclerview;

import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.MenuItem;

import java.util.ArrayList;
import java.util.List;

public class VocabularyActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private RecyclerView.Adapter adapter;
    private List<ListItem> listItemList;

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

        recyclerView=(RecyclerView) findViewById(R.id.recyclerView);
        recyclerView.setHasFixedSize(true);

        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        listItemList=new ArrayList<>();

        setNewData();

        adapter=new MyAdapter(listItemList,this);
        recyclerView.setAdapter(adapter);
    }
    private void setNewData() {

        ListItem listItem=new ListItem("Bird","1");
        listItemList.add(listItem);
        listItem=new ListItem("Animal","2");
        listItemList.add(listItem);
        listItem=new ListItem("Body","3");
        listItemList.add(listItem);

    }`
}

//PracticeActivity.java



package com.example.pkjha.recyclerview;

import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.MenuItem;

import java.util.ArrayList;
import java.util.List;

public class PracticeActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private RecyclerView.Adapter adapter;
    private List<ListItem> listItemList;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_practice);
        recyclerView=(RecyclerView) findViewById(R.id.recyclerView);

        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        listItemList=new ArrayList<>();

        setNewData();

        adapter=new MyAdapter(listItemList,this);
        recyclerView.setAdapter(adapter);
    }

    private void setNewData() {

        ListItem listItem=new ListItem("Chair","1");
        listItemList.add(listItem);
        listItem=new ListItem("Table","2");
        listItemList.add(listItem);
        listItem=new ListItem("Bed","3");
        listItemList.add(listItem);



    }

}

Answer 1

您可以创建一个接口(interface)并在两个 Activity 中实现它，然后为两个 Activity 编写您的 Intent 代码。然后，您可以使用在适配器的构造函数中传递的上下文从适配器调用接口(interface)方法。