如何在RecyclerView中实现带equals判断的Item点击事件？

之前ListView性能不足，我切换为RecyclerView，现已在MainActivity中实现RecyclerView的Item点击功能，需要实现类似ListView的逻辑：通过equals判断点击项的内容，为不同内容的Item执行对应自定义操作（如点击Dog播放指定音频）。

我的RecyclerView适配器代码 #

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

    private List<String> mData;
    private LayoutInflater mInflater;
    private ItemClickListener mClickListener;

    // data is passed into the constructor
    MyRecyclerViewAdapter(Context context, List<String> data) {
        this.mInflater = LayoutInflater.from(context);
        this.mData = data;
    }

    // inflates the row layout from xml when needed
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = mInflater.inflate(R.layout.adapter_box, parent, false);
        return new ViewHolder(view);
    }

    // binds the data to the TextView in each row
    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        String animal = mData.get(position);
        holder.myTextView.setText(animal);
    }

    // total number of rows
    @Override
    public int getItemCount() {
        return mData.size();
    }


    // stores and recycles views as they are scrolled off screen
    public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        TextView myTextView;

        ViewHolder(View itemView) {
            super(itemView);
            myTextView = itemView.findViewById(R.id.text_adapter);
            itemView.setOnClickListener(this);
        }

        @Override
        public void onClick(View view) {
            if (mClickListener != null) mClickListener.onItemClick(view, getAdapterPosition());
        }
    }

    // convenience method for getting data at click position
    String getItem(int id) {
        return mData.get(id);
    }

    // allows clicks events to be caught
    void setClickListener(ItemClickListener itemClickListener) {
        this.mClickListener = itemClickListener;
    }

    // parent activity will implement this method to respond to click events
    public interface ItemClickListener {
        void onItemClick(View view, int position);
    }
}

此前ListView的实现方式 #

ListView listView = findViewById(R.id.testL);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        if (parent.getItemAtPosition(position).equals("hello")) {
            TextView details = word_dialog.findViewById(R.id.word_edit_desc);
            details.setText("hello");
        }
    }
});

需要实现逻辑的RecyclerView点击方法 #

@Override
public void onItemClick(View view, int position) {

}

MainActivity相关代码 #

ArrayList<String> animalNames = new ArrayList<>();
animalNames.add("Dog");
animalNames.add("Cow");
animalNames.add("Camel");
animalNames.add("Sheep");
animalNames.add("Goat");

// set up the RecyclerView
recyclerView = findViewById(R.id.myList);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
adapter = new MyRecyclerViewAdapter(this, animalNames);
adapter.setClickListener(this);
recyclerView.setAdapter(adapter);

if (somecode.equals("Dog")){
    soundPlay(MediaPlayer.create(getBaseContext(), R.raw.star));
}
if (somecode.equals("Camel")){
    soundPlay(MediaPlayer.create(getBaseContext(), R.raw.tick));
}

直接在onItemClick方法中，通过适配器的getItem方法获取点击位置的内容，再进行判断执行对应操作，完整实现如下：

@Override
public void onItemClick(View view, int position) {
    // 获取当前点击项的内容
    String clickedAnimal = adapter.getItem(position);
    
    // 根据内容执行对应自定义操作
    if ("Dog".equals(clickedAnimal)) {
        soundPlay(MediaPlayer.create(getBaseContext(), R.raw.star));
    } else if ("Camel".equals(clickedAnimal)) {
        soundPlay(MediaPlayer.create(getBaseContext(), R.raw.tick));
    }
    // 可继续添加其他动物的判断逻辑
}

注意事项 #

• 使用"常量".equals(变量)的写法，能避免变量为null时抛出NullPointerException
• 借助适配器提供的getItem方法获取数据，符合代码封装原则，也无需重复操作数据源列表

内容的提问来源于stack exchange，提问作者SuperMen