问题描述
如何对消息的日期进行分组并在 android 中显示视图。我需要显示与应用相同的日期。
如何显示消息视图。
是否需要在单独的 viewholder 和单独的 xml 中显示分组日期视图，然后日期将在两个视图中进行排序？ （发送方和接收方视图持有者）
适配器：
public class ChatMessageAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private List<Messages> msgDtoList;
private final List<Messages> mData;
public static final int VIEW_TYPE_SENDER = 1;
public static final int VIEW_TYPE_RECEIVER = 2;
public ChatMessageAdapter(List<Messages> msgDtoList) {
this.msgDtoList = msgDtoList;
mData = msgDtoList;
}
public void setData(@Nullable Messages[] data) {
msgDtoList.clear();
for (Messages model : data) {
if (model instanceof Messages) {
mData.add(model);
continue;
}
}
@Override
public int getItemViewType(int position) {
Messages msgDto = this.msgDtoList.get(position);
if (msgDto.getmSender().getId() == Profile.getInstance().getId()) {
return VIEW_TYPE_SENDER;
}
else {
return VIEW_TYPE_RECEIVER;
}
}
@Override
public int getItemCount() {
return msgDtoList.size();
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder,int position) {
View v;
if(mMessages.getmSender().getId() == Profile.getInstance().getId()) {
sentViewHolder(holder,position);
} else if (msgDto.getmSender().getId() != Profile.getInstance().getId()) {
receivedViewHolder(holder,position);
}
}
@SuppressLint("ResourceAsColor")
private void sentViewHolder(RecyclerView.ViewHolder holder,int position) {
Messages msgDto = this.msgDtoList.get(position);
((SenderMessageHolder)holder).rightMsgTextView.setText(msgDto.getmMSg());
((SenderMessageHolder)holder).mDateTimestamp.setText(msgDto.getmTimestamp());
((SenderMessageHolder)holder).rightMsgTextView.setTextColor(R.color.yellow);
((SenderMessageHolder)holder).rightMsgTextView.setGravity(Gravity.CENTER_VERTICAL | Gravity.RIGHT);
}
@SuppressLint("ResourceAsColor")
private void receivedViewHolder(RecyclerView.ViewHolder holder,int position) {
Messages msgDto = this.msgDtoList.get(position);
((ReceiverMessageHolder)holder).leftMsgTextView.setText(msgDto.getmMSg());
((ReceiverMessageHolder)holder).mDateTimestamp.setText(msgDto.getmTimestamp());
((ReceiverMessageHolder)holder).leftMsgTextView.setTextColor(R.color.red);
((ReceiverMessageHolder)holder).leftMsgTextView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent,int viewType) {
Messages msgDto = this.msgDtoList.get(viewType);
if (msgDto.getmSender().getId() == Profile.getInstance().getId() ) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.sender_message_layout,parent,false);
return new SenderMessageHolder(view);
} else {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.receiver_message_layout,false);
return new ReceiverMessageHolder(view);
}
}
}
}
在 ChatFragment.java 中
@Override
public void onViewCreated(View v,@Nullable Bundle b) {
super.onViewCreated(v,b);
mChat = (TextView) v.findViewById(R.id.chat_messages);
mSendMsginputBox = (EditText) v.findViewById(R.id.chat_input_msg);
mSendMsg = (ImageView) v.findViewById(R.id.chat_send_msg);
mChatMessageRecyclerView = (RecyclerView) v.findViewById(R.id.recycler_view);
linearlayoutmanager linearlayoutmanager = new linearlayoutmanager(getActivity());
linearlayoutmanager.setorientation(linearlayoutmanager.VERTICAL);
linearlayoutmanager.setStackFromEnd(true);
linearlayoutmanager.setSmoothScrollbarEnabled(true);
mChatMessageRecyclerView.setLayoutManager(linearlayoutmanager);
final List<Messages> msgDtoList = new ArrayList<LastMessageContent>();
int newMsgPosition = msgDtoList.size() - 1;
mChatMessageRecyclerView.scrollToPosition(0);
mChatMessageRecyclerView.setLayoutManager(new linearlayoutmanager(getActivity(),linearlayoutmanager.VERTICAL,false));
mChatMessageRecyclerView.setHasFixedSize(true);
mChatMessageRecyclerView.setAdapter(mAdapter);
ArrayList<Messages> messagesList = new ArrayList<>();
for (int i=0;i<10;i++) {
// messagesList.add(new LastMessageContent( mSendMsginputBox.getText().toString(),Profile.getInstance().getId() == mChatMessage.getmSender().getId() ? ChatMessageAdapter.VIEW_TYPE_SENDER : ChatMessageAdapter.VIEW_TYPE_RECEIVER));
}
List<List<Messages>> itemList = new ArrayList<>();
mSendMsg.setonClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String msgContent = mSendMsginputBox.getText().toString();
if(!TextUtils.isEmpty(msgContent))
{
Messages msgDto = mChatMessage.getmessages();
msgDtoList.add(msgDto);
itemList.add(msgDtoList);
mAdapter.notifyDataSetChanged();
if (mSendMsginputBox.toString() != "") {
LastMessageContent msgDto1 = new LastMessageContent(mChatMessage.getmLastMessageContent().getmMSg(),mChatMessage.getId());
System.out.println("msgDto1msgDto1 ==" + msgDto1);
msgDtoList.add(msgDto1);
}
mAdapter.registeradapterDataObserver(new RecyclerView.AdapterDataObserver() {
@Override
public void onItemRangeInserted(int positionStart,int itemCount) {
super.onItemRangeInserted(positionStart,itemCount);
int messageCount = mAdapter.getItemCount();
int lastVisiblePosition =
linearlayoutmanager.findLastCompletelyVisibleItemPosition();
// If the recycler view is initially being loaded or the
// user is at the bottom of the list,scroll to the bottom
// of the list to show the newly added message.
if (lastVisiblePosition == -1 ||
(positionStart >= (friendlyMessageCount - 1) &&
lastVisiblePosition == (positionStart - 1))) {
mChatMessageRecyclerView.scrollToPosition(positionStart);
}
}
});
}
}
解决方法
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