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！