[英]Two ArrayList one RecyclerView Adapter
我有一个聊天屏幕,我可以与其他用户聊天,我将聊天数据(消息,时间和发件人通过列表)发送到RecyclerAdapter,用数据填充聊天视图。现在我还有一个列表,其中包含不同布局的数据。 像这样
这是我的方法,我将第二个arraylist称为RecyclerAdapter
public void TransferResultTo_Activity(List<Image_data_Wrapper> list) {
Log.d(TAG,"Here is data Result From AsyncTask "+list.size());
getResult=list;
Image_data_Wrapper Image=getResult.get(0);
Log.d(TAG,"Result from Image data "+Image.getPage_Title());
adapter=new Chat_Adapter(this,message,getResult);
adapter.notifyDataSetChanged();
}
如上所述,当我尝试通过recyclerView.setAdapter(adapter);
调用适配器时recyclerView.setAdapter(adapter);
它从屏幕上删除所有消息并显示我的图像数据。 但我想保留所有消息,并通过新列表显示数据与数据
这是我的聊天适配器
public class Chat_Adapter extends RecyclerView.Adapter<Chat_Adapter.ViewHolder> {
private String UserID;
private Context context;
//TAG FOR TRACKING SELF MESSAGE
private int Self_Msg=0;
//ARRAYLIST OF MESSAGES OBJECT CONTAINING ALL THE MESSAGES IN THE THREAD
private List<Chat_Wrapper> arrayList_message;
public static final String TAG="###CHAT_ADAPTER###";
private List<Image_data_Wrapper> data_Result;
boolean valtype;
public Chat_Adapter(Context context, List<Chat_Wrapper> message) {
//UserID = userID;
this.context = context;
this.arrayList_message = message;
Log.d(TAG,"Chat Adapter Calling");
}
public Chat_Adapter(Context context, List<Image_data_Wrapper> result,boolean val) {
this.context = context;
this.data_Result = result;
this.valtype=val;
Log.d(TAG,"Image data Chat Adapter Calling");
}
public Chat_Adapter() {
}
@Override
public Chat_Adapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView;
Log.d(TAG,"On Create View Holder Calling ");
if (viewType==Self_Msg){
itemView= LayoutInflater.from(parent.getContext()).inflate(R.layout.chat_screen_message_item,parent,false);
Log.d(TAG,"On Create View Holder Calling View Type is "+itemView);
}
else if (valtype==true){
itemView= LayoutInflater.from(parent.getContext()).inflate(R.layout.Image_data_layout,parent,false);
Log.d(TAG,"ON CREATE VIEW HOLDER RUNNING AND data RESULT VIEW TYPE IS RUNNING "+viewType);
}
else {
itemView= LayoutInflater.from(parent.getContext()).inflate(R.layout.chat_screen_message_item,parent,false);
Log.d(TAG,"On Create View Holder Calling View Type is "+itemView);
}
return new ViewHolder(itemView);
}
@Override
public void onBindViewHolder(Chat_Adapter.ViewHolder holder, int position) {
if (valtype==true){
Image_data_Wrapper wrapper=data_Result.get(position);
holder.data_title.setText(wrapper.getPage_Title());
holder.data_link.setText(wrapper.getPage_Link());
holder.data_snippet.setText(wrapper.getPage_Desc());
Picasso.with(context).load(wrapper.getPage_ImageThumb()).into(holder.Image_Image);
valtype=false;
}
else {
Log.d(TAG,"On Bind VIew Holder Context "+context);
Chat_Wrapper wrapper=arrayList_message.get(position);
Log.d(TAG,"On Bind VIew Holder Chat Wrapper "+wrapper);
holder.Message.setText(wrapper.getMessage());
holder.TimeStamp.setText(wrapper.getTimestamp());
}
}
@Override
public int getItemCount() {
Log.d(TAG,"Get Item Count Running");
int items;
if (valtype==true){
Log.d(TAG,"data Result Array is not empty");
items=data_Result.size();
Log.d(TAG,"Total Number Of Item "+items);
return items;
}
else {
Log.d(TAG,"ARRAY SIZE AT GETITEM COUNT "+arrayList_message.size());
return arrayList_message.size();
}
}
@Override
public int getItemViewType(int position) {
Log.d(TAG,"Get Item View Type Running");
return position;
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView Message,TimeStamp,data_title,data_link,data_snippet;
ImageView User_image,Image_Image;
ImageButton data_SendButton;
public ViewHolder(View itemView) {
super(itemView);
Message= (TextView) itemView.findViewById(R.id.Single_Item_Chat_Message);
TimeStamp= (TextView) itemView.findViewById(R.id.Single_Item_Chat_TimeStamp);
User_image= (ImageView) itemView.findViewById(R.id.Single_Item_Chat_ImageView);
if (valtype==true){
Log.d(TAG,"Setting View For Image data ");
data_title= (TextView) itemView.findViewById(R.id.Image_data_Title);
data_link= (TextView) itemView.findViewById(R.id.Image_data_Link);
data_snippet= (TextView) itemView.findViewById(R.id.Image_data_Snippet);
Image_Image= (ImageView) itemView.findViewById(R.id.Image_data_Image);
data_SendButton= (ImageButton) itemView.findViewById(R.id.Image_data_SendButton);
}
}
}
public void updateDataWithdataResult(List<Image_data_Wrapper> list,boolean setValue){
Log.d(TAG,"Update Data Method Calling");
this.data_Result=list;
this.valtype=setValue;
}
}
这个代码我面临的问题
更新 :当我通过recyclerView.setAdapter(adapter)
调用适配器时,它按我的意愿工作,但adapter.notifyDataSetChanged
使调用卡在适配器构造函数中(感谢DanielLaneDC)。 那么我可以保留它或者adapter.notifyDataSetChanged
应该工作吗?
听起来您想要使用相同的RecyclerView.Adapter在同一个RecyclerView中显示两个不同的项目列表。 值得庆幸的是,这是RecyclerView.Adapter可以很好地处理的事情。
以下是RecyclerView.Adapter的外观:
public class ChatAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
final int VIEW_TYPE_MESSAGE = 0;
final int VIEW_TYPE_IMAGE = 1;
Context context;
List<ChatWrapper> messages;
List<ImageDataWrapper> images;
public ChatAdapter(Context context, List<ChatWrapper> messages, List<ImageDataWrapper> images){
this.context = context;
this.messages = messages;
this.images = images;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType){
if(viewType == VIEW_TYPE_MESSAGE){
return new MessageViewHolder(itemView);
}
if(viewType == VIEW_TYPE_IMAGE){
return new ImageViewHolder(itemView);
}
return null;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position){
if(viewHolder instanceof MessageViewHolder){
((MessageViewHolder) viewHolder).populate(messages.get(position));
}
if(viewHolder instanceof ImageViewHolder){
((ImageViewHolder) viewHolder).populate(images.get(position - messages.size()));
}
}
@Override
public int getItemCount(){
return messages.size() + images.size();
}
@Override
public int getItemViewType(int position){
if(position < messages.size()){
return VIEW_TYPE_MESSAGE;
}
if(position - messages.size() < images.size()){
return VIEW_TYPE_IMAGE;
}
return -1;
}
public class MessageViewHolder extends RecyclerView.ViewHolder {
TextView message;
TextView timeStamp;
ImageView userImage;
public MessageViewHolder(View itemView){
super(itemView);
message = (TextView) itemView.findViewById(R.id.Single_Item_Chat_Message);
timeStamp = (TextView) itemView.findViewById(R.id.Single_Item_Chat_TimeStamp);
userImage = (ImageView) itemView.findViewById(R.id.Single_Item_Chat_ImageView);
}
public void populate(ChatWrapper chatWrapper){
message.setText(chatWrapper.getMessage());
userImage.setText(chatWrapper.getTimestamp());
}
}
public class ImageViewHolder extends RecyclerView.ViewHolder {
TextView dataTitle;
TextView dataLink;
TextView dataSnippet;
ImageView image;
ImageButton dataSendButton;
public ImageViewHolder(View itemView){
super(itemView);
dataTitle = (TextView) itemView.findViewById(R.id.Image_data_Title);
dataLink = (TextView) itemView.findViewById(R.id.Image_data_Link);
dataSnippet = (TextView) itemView.findViewById(R.id.Image_data_Snippet);
image = (ImageView) itemView.findViewById(R.id.Image_data_Image);
dataSendButton = (ImageButton) itemView.findViewById(R.id.Image_data_SendButton);
}
public void populate(ImageDataWrapper imageDataWrapper){
dataTitle.setText(imageDataWrapper.getPage_Title());
dataLink.setText(imageDataWrapper.getPage_Link());
dataSnippet.setText(imageDataWrapper.getPage_Desc());
Picasso.with(context).load(imageDataWrapper.getPage_ImageThumb()).into(image);
}
}
}
这是您的Activity
所需要的:
List<ChatWrapper> messages;
List<ImageDataWrapper> images;
ChatAdapter adapter;
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
messages = new ArrayList<>();
images = new ArrayList<>();
ChatAdapter adapter = new ChatAdapter(this, messages, images);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(adapter);
}
public void addMessage(ChatWrapper message){
messages.add(message);
adapter.notifyDataSetChanged();
}
public void removeMessage(ChatWrapper message){
if(messages.remove(message)){
adapter.notifyDataSetChanged();
}
}
public void addImage(ImageDataWrapper image){
images.add(image);
adapter.notifyDataSetChanged();
}
public void removeImage(ImageDataWrapper image){
if(images.remove(image)){
adapter.notifyDataSetChanged();
}
}
如果要更新数据,只需为消息调用addMessage(ChatWrapper)
或removeMessage(ChatWrapper)
,为图像addImage(ImageDataWrapper)
或removeImage(ImageDataWrapper)
。
一些关键点:
valType
变量, getItemCount()
应该始终返回两个列表组合的大小等) 首先,您需要将两个数组合并在单个arraylist中,例如.. firsArrlist.addAll(secondArrList);
并传入recyclerview适配器并使用一些标志进行迁移,并使用另一个查看器获取特定标志,以在recyclerview中设置该视图。
总计数必须是firstArrlist.size + secondArrList.size
public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
class ViewHolder0 extends RecyclerView.ViewHolder {
...
public ViewHolder0(View itemView){
...
}
}
class ViewHolder2 extends RecyclerView.ViewHolder {
...
public ViewHolder2(View itemView){
...
}
@Override
public int getItemViewType(int position) {
// Just as an example, return 0 or 2 depending on position
// Note that unlike in ListView adapters, types don't have to be contiguous
return position % 2 * 2;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
switch (viewType) {
case 0: return new ViewHolder0(...);
case 2: return new ViewHolder2(...);
...
}
}
@Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
switch (holder.getItemViewType()) {
case 0:
ViewHolder0 viewHolder0 = (ViewHolder0)holder;
...
break;
case 2:
ViewHolder2 viewHolder2 = (ViewHolder2)holder;
...
break;
}
}
}
我有同样的问题。 如果需要,您可以创建Pojo类并输入关联,例如聊天可以有多个图像。 然后构建聊天对象并在其中插入图像列表。 在将列表传递给适配器之前,请使用原始数据填充它。 我知道这对您的需求可能不是一个很好的解决方案,但请记住,您可以完全控制,而无需对列表进行细分。
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