对RecycleView的多种item布局的封装

本文是借鉴bingoogolapple写得BGAAdapter-Android而产生的，对此表示感谢。

效果

1.Adapter的使用

1.继承BaseAdapter

这里是我的adapter

public class RecyclerChatAdapter extends BaseAdapter<ChatModel> { public Context context; protected ADUholder holder; public RecyclerChatAdapter(Context context) { super(); this.context = context; } @Override public int getItemViewType(int position) { return mDatas.get(position).type; } @Override protected BaseViewHolder addViewHolder(ViewGroup parent, int viewType) { View view = null; switch (viewType) { case Type.chat: view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_chat, parent, false); return new ChatHolder(view); case Type.other: view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_list, parent, false); return new ADUholder(view); default://防止空指针 view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_chat, parent, false); return new ChatHolder(view); } } @Override protected void fillData(RecyclerView.ViewHolder holder, int position, ChatModel model) { if (holder instanceof ChatHolder) { ChatHolder chatHolder = (ChatHolder) holder; chatHolder.fillData(context, mDatas, position); } else if (holder instanceof ADUholder) { ADUholder adUholder = (ADUholder) holder; adUholder.fillData(context, mDatas, position); } } }

注意这里要实现多item布局就要重写getItemViewType()方法，我们可以在item中的属性中增加一个类型，如我这里是在ChatModel中增加了一个int type；在getItemViewType()获取它。

2.重写addViewHolder()

根据参数viewType来加载不同的item布局，我这里仅仅写了两种，你可以继续增加。

@Override protected BaseViewHolder addViewHolder(ViewGroup parent, int viewType) { View view = null; switch (viewType) { case Type.chat: view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_chat, parent, false); return new ChatHolder(view); case Type.other: view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_list, parent, false); return new ADUholder(view); } return null; }

3.重写getItemViewType()

代码如下：

@Override public int getItemViewType(int position) { return mDatas.get(position).type; }

这里根据你每个item中的type来返回，对应addViewHolder()方法中的参数viewType。

4.重写fillData()

这里就是填充数据了

@Override protected void fillData(RecyclerView.ViewHolder holder, int position, ChatModel model) { if (holder instanceof ChatHolder) { ChatHolder chatHolder = (ChatHolder) holder; chatHolder.fillData(context, mDatas, position); } else if (holder instanceof ADUholder) { ADUholder adUholder = (ADUholder) holder; adUholder.fillData(context, mDatas, position); } }

adapter这里我们就做完了，剩下了就是ViewHolder。

2.ViewHolder的使用

1.继承BaseViewHolder

我的代码如下：

public class ChatHolder extends BaseViewHolder<ChatModel> { protected RelativeLayout rl_item_chat_to; protected RelativeLayout rl_item_chat_from; protected TextView tv_item_chat_from_msg; protected TextView tv_item_chat_to_msg; public ChatHolder(View view) { super(view); rl_item_chat_to = findViewById(R.id.rl_item_chat_to); rl_item_chat_from = findViewById(R.id.rl_item_chat_from); tv_item_chat_from_msg = findViewById(R.id.tv_item_chat_from_msg); tv_item_chat_to_msg = findViewById(R.id.tv_item_chat_to_msg); } @Override public void fillData(Context context, List<ChatModel> datas, int position) { ChatModel model = datas.get(position); if (model.mUserType == ChatModel.UserType.From) { rl_item_chat_to.setVisibility(View.GONE); rl_item_chat_from.setVisibility(View.VISIBLE); String msg = String.format(mContent.getString(R.string.color_msg_from), model.mMsg); Spanned htmlMsg = Html.fromHtml(msg); tv_item_chat_from_msg.setText(htmlMsg,TextView.BufferType.SPANNABLE); } else { rl_item_chat_to.setVisibility(View.VISIBLE); rl_item_chat_from.setVisibility(View.GONE); String msg = String.format(mContent.getString(R.string.color_msg_from), model.mMsg); Spanned htmlMsg = Html.fromHtml(msg); tv_item_chat_to_msg.setText(htmlMsg,TextView.BufferType.SPANNABLE); } } }

2.构造方法

你要实现一个带有View参数的构造方法，我们可以在此做控件绑定。

3.重写fillData()

这里是你真正控件填充数据的地方，对每个item项。

4.另一个ViewHolder

public class ADUholder extends BaseViewHolder<ChatModel> { public ImageView imageView; public TextView title; public TextView name; public ADUholder(View itemView) { super(itemView); imageView = findViewById(R.id.imageView); title = findViewById(R.id.tv_title); name = findViewById(R.id.tv_name); } @Override public void fillData(Context context, List<ChatModel> datas, int position) { ChatModel model = datas.get(position); title.setText(model.name + position); name.setText(model.mMsg); } }

是不是感觉简单了很多，当然这是我自己的看法。

好了，在此附上github源码，喜欢的请start、fork。 https://github.com/DyncKathline/TestRecyclerView

转载请注明出处，谢谢！