Android – Firebase – 将用户发送到聊天室

目标

允许用户访问他们选择的群聊。 用户单击群聊名称后，将进入群聊。

数据库树

如数据库树中所示，将显示当前已登录用户的已创建的群聊名称列表。

我有一个管理员帐户来为用户创建这些群聊。

在数据库中看到的Android，亚洲和欧洲组聊天不是固定变量。 他们是名字。 新的群聊名称可以是“地球”。

因此，除了由Node本身调用它之外，没有办法通过变量调用它。

应用截图

1. 组聊天列表2.进入群聊

活动流程

1. GroupFragment —>聊天活动

2. GroupFragment <—聊天活动

申请流程

用户—> LoginActivity —> UserActivity —> GroupFrag —> GroupChatActivity

在（GroupFrag —> GroupChatActivity）用户必须在GroupFrag中选择一个群聊名称才能进入GroupChatActivity

用户必须在GroupFrag中选择一个群聊名称才能输入GroupChatActivity

描述

1. 用户将能够选择群聊名称（来自GroupFragment），该应用程序将使用户进入群聊（进入聊天活动）。 用户将能够返回GroupFragment并选择另一个所需的组。

（群聊名称未固定 – 它们不是可以从中调用的节点）

问题

1. 在片段中提示后，我无法选择群聊名称，这将带我进入群聊。

集团片段

@Override public void onStart() { super.onStart(); class GroupAdapter extends RecyclerView.Adapter { ArrayList list; public GroupAdapter(ArrayList list) { this.list = list; } @Override public GroupAdapter.MyHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_groups, parent, false); return new MyHolder(view); } @Override public void onBindViewHolder(MyHolder holder, int position) { holder.setText(list.get(position)); } @Override public int getItemCount() { return list.size(); } class MyHolder extends RecyclerView.ViewHolder { TextView nameTextView; public MyHolder(View itemView) { super(itemView); nameTextView = itemView.findViewById(R.id.groupChatNameTxt); } public void setText(String groupName) { nameTextView.setText(groupName); } } } jGroupsDatabase.addValueEventListener(new ValueEventListener() { @Override public void onDataChange(DataSnapshot dataSnapshot) { ArrayList groupChatNames = new ArrayList(); for (DataSnapshot child : dataSnapshot.getChildren()) { groupChatNames.add(child.getKey()); } GroupAdapter adapter = new GroupAdapter(groupChatNames); jGroupChatList.setAdapter(adapter); //I'm not sure where to write a code for userID //final String usersID = getRef(position).getKey(); // When the user clicks on one of the group chat names, he/she will be sent to the Chat Activity jGroupChatList.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Intent intentUserProfile = new Intent(getActivity(), ChatActivity.class); intentUserProfile.putExtra("groupChatName",groupName); intentUserProfile.putExtra("neighbourhood", neighbourhood); intentUserProfile.putExtra("usersName", usersName); intentUserProfile.putExtra("usersID", usersID); startActivity(intentUserProfile); } }); } @Override public void onCancelled(DatabaseError databaseError) { } }); } 

聊天活动

 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_chat); jGroupChatName = getIntent().getExtras().get("groupChatName").toString(); jUserID = getIntent().getExtras().get("usersID").toString(); jUserName = getIntent().getExtras().get("usersName").toString(); jUserNeighbourhood = getIntent().getExtras().get("neighbourhood").toString(); jChatRoot = FirebaseDatabase.getInstance().getReference().child(jGroupChatName); jChatToolbar = (Toolbar) findViewById(R.id.allUSersToolBar); setSupportActionBar(jChatToolbar); getSupportActionBar().setTitle(jGroupChatName); // Show the name of the selected group name getSupportActionBar().setDisplayHomeAsUpEnabled(true); } 

附加评论

• 在线教程

我在youtube上观看了Android Firebase群聊教程。 该链接为https://www.youtube.com/watch?v=wVCz1a3ogqk 。 但它没有提供我试图实现的一些function/function。

• 相关问题

Android – Firebase – 提示群聊名称

未来的实施

对于将来的实现，我想发送和检索消息并将其提示到群聊中，以便用户查看真实的群聊。 但是，当然，我会将其留给另一个问题。

Answer 1

您可以按如下方式更新适配器和查看器实现：

 public class Adapter extends RecyclerView.Adapter { Context context; ArrayList list; public Adapter(Context context, ArrayList list) { this.context = context; this.list = list; } @Override public Adapter.MyHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_groups, parent, false); MyHolder holder = new MyHolder(view); return holder; } @Override public void onBindViewHolder(MyHolder holder, int position) { holder.setText(list.get(position)); } @Override public int getItemCount() { return list.size(); } class MyHolder extends RecyclerView.ViewHolder { TextView nameTextView; View.OnClickListener onClickListener = new View.OnClickListener() { @Override public void onClick(View view) { String groupName = list.get(getAdapterPosition()); Intent intentUserProfile = new Intent(context, MainActivity.class); intentUserProfile.putExtra("groupChatName", groupName); // If fixed, you should pass these values to adapter's constructor // intentUserProfile.putExtra("neighbourhood", neighbourhood); // intentUserProfile.putExtra("usersName", usersName); // intentUserProfile.putExtra("usersID", usersID); context.startActivity(intentUserProfile); } }; public MyHolder(View itemView) { super(itemView); itemView.setOnClickListener(onClickListener); nameTextView = (TextView) itemView.findViewById(R.id.groupChatNameTxt); } public void setText(String groupName) { nameTextView.setText(groupName); } } } 

您还必须在GroupFragment更新此行：

 GroupAdapter adapter = new GroupAdapter(getActivity(), groupChatNames); 

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这是您可以在片段中实现的另一个解决方案，以便您可以将其他内容添加到intent中（实际上是根据您之前的问题进行修改）：

 @Override public void onStart() { super.onStart(); DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference(); DatabaseReference groupChatsRef = rootRef.child("Group Chats"); FirebaseRecyclerAdapter chatAdapter = new FirebaseRecyclerAdapter( String.class, R.layout.layout_groups, GroupChatViewHolder.class, groupChatsRef) { protected void populateViewHolder(GroupChatViewHolder viewHolder, String model, int position) { final String groupChatName = this.getRef(position).getKey(); viewHolder.setName(groupChatName); viewHolder.itemView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Intent intentUserProfile = new Intent(getActivity(), ChatActivity.class); intentUserProfile.putExtra("groupChatName", groupChatName); intentUserProfile.putExtra("neighbourhood", neighbourhood); intentUserProfile.putExtra("usersName", usersName); intentUserProfile.putExtra("usersID", usersID); startActivity(intentUserProfile); } }); } }; jGroupChatList.setAdapter(chatAdapter); } 

请注意，它将数据库中的字符串字符串组聊天条目作为键值对处理。

Answer 2

  public class group_name_list_adapter extends RecyclerView.Adapter { private List< group_name_list> listItems; private Context context; OnItemClickListener onItemClickListener; public group_name_list_adapter(List listItems, Context context) { this.listItems = listItems; this.context = context; } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View v = LayoutInflater.from(parent.getContext()) .inflate(R.layout.group_name_list, parent, false); return new ViewHolder(v); } @Override public void onBindViewHolder(ViewHolder holder, final int position) { group_name_list listItem = listItems.get(position); holder.txtTitle.setText(listItem.getTxtTitle()); holder.txtTitle.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { onItemClickListener.onGroupNameClick(position); } }); } @Override public int getItemCount() { return listItems.size(); } public class ViewHolder extends RecyclerView.ViewHolder { public TextView txtTitle; public ViewHolder(View itemView) { super(itemView); txtTitle = (TextView) itemView.findViewById(R.id.txtTitle); } } public void setOnItemClickListener(OnItemClickListener onItemClickListener){ this.onItemClickListener = onItemClickListener; } public interface OnItemClickListener{ void onGroupNameClick(int position); } } public class group_name_list { private String txtTitle; public group_name_list(String txtTitle) { this.txtTitle = txtTitle; } public String getTxtTitle() { return txtTitle; } } public class ChatActivity implements group_name_list_adapter.OnItemClickListener private RecyclerView recyclerGroupName; private group_name_list_adapter groupNameAdapter; private List group_name_List; private List groupNameKeyList; //This is optional – this is used if you wanted the group chats to have the same name instead of overwriting the groupchat when creating. Inside your Firebase call: group_name_List.removeAll(group_name_List t); groupNameKeyList.removeAll(groupNameKeyList); //Depending on your firebase reference. This could just be dataSnapshot.getChildren() for (DataSnapshot child : dataSnapshot.child("Group Chats").getChildren()){ if (!child.getKey().equals(null)){ groupNameKeyList.add(child.getKey().toString()); //Again this is optional } group_name_list newGroupList = child.getValue(); ); groupNameList.add(newGroupList); } recyclerGroupName.setAdapter(groupNameAdapter); gLayoutAttribute = new GridLayoutManager(getActivity(), 1); recyclerGroupName = (RecyclerView) rootView.findViewById(R.id.recyclerGroupName); recyclerGroupName.setHasFixedSize(true); recyclerGroupName.setLayoutManager(new LinearLayoutManager(this.getContext())); recyclerGroupName.setLayoutManager(gLayoutAttribute); @Override public void onAttributeClick(int position) { Intent intentUserProfile = new Intent(getActivity(), ChatActivity.class); intentUserProfile.putExtra("groupChatName",groupName); intentUserProfile.putExtra("neighbourhood", neighbourhood); intentUserProfile.putExtra("usersName", usersName); intentUserProfile.putExtra("usersID", usersID); intent.putExtra("name", groupList.get(position).toString()); //intent.putExtra("name", groupListKeyList.get(position).toString()); this is your optional key startActivity(intentUserProfile); } 

Answer 3

试试这个

1. 假设您已使用不同的UID's在FirebaseDatabase创建了5 user's
2. 在此步骤中，您必须从Firebase get all user's并将其显示在RecyclerView
3. 在onBindViewHolder' you have to do like位于onBindViewHolder' you have to do like Recyclerview's adapter class中onBindViewHolder' you have to do like在创建组时生成的列表中添加和删除用户。
4. 在此步骤中，您将搜索当前logged in firebaseDatabase用户的Uid ，如果您在任何Group找到UID is matched的UID is matched ，则需要获取Group-name 。

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