升级AGP8.0：将ButterKnife多ViewHolder RecyclerView重构为ViewBinding

核心思路 #

你的场景核心问题是自定义View作为RecyclerView的item布局，其内部嵌套了实际控件所在的布局，所以不能直接用itemView的Binding，而是要先获取自定义View内部的布局Binding，再做控件绑定。下面分步骤给出改造方案：

1. 暴露自定义View的内部Binding #

以MessageTextViewLeft为例，它的实际控件都在widget_text_msg_left.xml里，开启ViewBinding后会自动生成WidgetTextMsgLeftBinding，在自定义View中添加方法暴露这个Binding：

public class MessageTextViewLeft extends LinearLayout {
    private WidgetTextMsgLeftBinding binding;

    public MessageTextViewLeft(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init() {
        binding = WidgetTextMsgLeftBinding.inflate(LayoutInflater.from(getContext()), this, true);
    }

    // 对外提供内部Binding的访问入口
    public WidgetTextMsgLeftBinding getBinding() {
        return binding;
    }
}

2. 逐层级改造ViewHolder #

基类ViewHolder（无改动）

public class ViewHolder extends RecyclerView.ViewHolder {
    ViewHolder(View v) {
        super(v);
    }
}

SeparatorViewHolder改造

直接用对应布局的Binding替换ButterKnife绑定：

public class SeparatorViewHolder extends ViewHolder {
    private WidgetMessageSeparatorBinding binding;

    SeparatorViewHolder(WidgetMessageSeparatorBinding binding) {
        super(binding.getRoot());
        this.binding = binding;
    }

    // 使用控件直接通过binding.mDate访问
}

MessageViewHolder改造

通过自定义View获取内部Binding，替换@BindView，手动设置点击事件替代@OnClick：

public class MessageViewHolder extends ViewHolder {
    protected WidgetTextMsgLeftBinding binding;
    private long id;
    private MessageStatus mMessageStatus;

    MessageViewHolder(View v) {
        super(v);
        // 从自定义View拿到内部布局的Binding
        if (v instanceof MessageTextViewLeft) {
            this.binding = ((MessageTextViewLeft) v).getBinding();
        }

        // 原初始化逻辑改用Binding实现
        binding.messageCustomWidget.setVisibility(View.GONE);
        binding.messageTextviewSenderName.setVisibility(View.GONE);
        if (binding.messageTextviewResponseLayout != null) {
            binding.messageTextviewResponseLayout.setVisibility(View.GONE);
        }

        // 替换@OnClick，手动设置点击事件
        binding.messageTextviewAck.setOnClickListener(v1 -> {
            easyLog.info("[onMessageAckClick] Ho cliccato sull'ack del messaggio con id -> "+ id);
            showMessageAckConfirmDialog(id, true);
        });

        binding.messageTextviewNack.setOnClickListener(v1 -> {
            easyLog.info("[onMessageAckClick] Ho cliccato sul nack del messaggio con id -> "+ id);
            showMessageAckConfirmDialog(id, false);
        });
    }

    public void setId(long id) {
        this.id = id;
    }
}

AudioViewHolder改造

复用父类的Binding，自身加载的音频布局也用ViewBinding处理：

public class AudioViewHolder extends MessageViewHolder {
    private ListItemAudioLeftBinding audioBinding;

    AudioViewHolder(View v, int audioLayout) {
        super(v);

        // 用ViewBinding加载音频布局
        audioBinding = ListItemAudioLeftBinding.inflate(LayoutInflater.from(v.getContext()));
        binding.messageCustomWidget.addView(audioBinding.getRoot());
        binding.messageCustomWidget.setVisibility(View.VISIBLE);

        // 直接通过Binding访问音频控件
        AudioControlView mAudioControlView = audioBinding.playerView;
    }
}

ImageViewHolder改造

同理，用ViewBinding加载图片布局：

public class ImageViewHolder extends MessageViewHolder {
    private MessageImageView mMessageImageView;
    private ImageView mImageView;

    ImageViewHolder(View v, int imageLayout) {
        super(v);

        // 根据布局类型加载对应Binding
        if (imageLayout == R.layout.list_item_image_left) {
            ListItemImageLeftBinding imageBinding = ListItemImageLeftBinding.inflate(LayoutInflater.from(v.getContext()));
            mMessageImageView = imageBinding.messageImage;
        } else {
            ListItemImageRightBinding imageBinding = ListItemImageRightBinding.inflate(LayoutInflater.from(v.getContext()));
            mMessageImageView = imageBinding.messageImage;
        }

        mImageView = mMessageImageView.getImageView();
        binding.messageCustomWidget.addView(mMessageImageView);
        binding.messageCustomWidget.setVisibility(View.VISIBLE);
    }
}

3. 调整onCreateViewHolder逻辑 #

创建ViewHolder时直接传递对应Binding，或保持原View初始化逻辑（内部已改用Binding）：

@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    LayoutInflater inflater = LayoutInflater.from(parent.getContext());
    switch(viewType) {
        case TYPE_SEPARATOR:
            WidgetMessageSeparatorBinding separatorBinding = WidgetMessageSeparatorBinding.inflate(inflater, parent, false);
            return new SeparatorViewHolder(separatorBinding);

        case TYPE_MESSAGE_TEXT_LEFT:
            View textLeftView = inflater.inflate(R.layout.list_item_text_left, parent, false);
            return new MessageViewHolder(textLeftView);

        case TYPE_MESSAGE_TEXT_WITH_IMAGE_LEFT:
            View imageLeftView = inflater.inflate(R.layout.list_item_text_left, parent, false);
            return new ImageViewHolder(imageLeftView, R.layout.list_item_image_left);

        case TYPE_MESSAGE_TEXT_WITH_AUDIO_LEFT:
            View audioLeftView = inflater.inflate(R.layout.list_item_text_left, parent, false);
            return new AudioViewHolder(audioLeftView, R.layout.list_item_audio_left);

        // 剩余case保持原逻辑，内部已替换为Binding实现
        default:
            return null;
    }
}

4. 修改onBindViewHolder的控件绑定逻辑 #

通过ViewHolder的Binding直接访问控件完成数据绑定：

private void onBindTextLeftViewHolder(MessageViewHolder holder, InboxMessage item) {
    holder.binding.messageTextviewText.setText(item.getContent());
    holder.binding.messageTextviewTime.setText(item.getTime());
    holder.setId(item.getId());
    // 其他绑定逻辑...
}

注意事项 #

• 确保所有用到的布局都开启ViewBinding（AGP8.0默认开启，若未开启需在module的build.gradle中配置viewBinding { enabled = true }）
• ViewBinding会自动处理空安全，但如果布局中可能不存在目标控件，仍需添加非空判断
• 自定义View的Binding必须在构造方法中正确初始化并暴露，否则ViewHolder无法获取内部控件

内容的提问来源于stack exchange，提问作者Lubron