recyclerview中的多个布局

ht4b089n  于 2021-06-21  发布在  Mysql
关注(0)|答案(2)|浏览(454)

我想做一个类似聊天的表示，其中我有三个布局：mainactivity:我有一个recyclerview布局\u sent:这是发送消息的布局\u received:这是接收消息的布局
我使用的是mysql数据库：获取数据的查询是：

  1. Select cr.user_id, cr.reply, d.griev_desc, c.user_one, c.user_two from grievance_details d , conversation_reply cr, conversation c where d.complain_id = 11 and cr.complain_id = d.complain_id and c.complain_id = 11

这是给我的输出：

我的android适配器代码是：

  1. public class DifferentRowAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{
  3. String user_one;
  4. String user_two;
  5. ArrayList<String> user_id_array;
  6. ArrayList<String> griev_desc_array;
  7. ArrayList<String> reply_array_emp;
  8. ArrayList<String> reply_array_hr;
  9. Context c;
  11. public DifferentRowAdapter(Context c, String user_one, String user_two,
  12.                            ArrayList<String> user_id_array, ArrayList<String> griev_desc_array,
  13.                            ArrayList<String> reply_array_emp, ArrayList<String> reply_array_hr) {
  14.     this.c =c ;
  15.     this.user_id_array = user_id_array;
  16.     this.user_one = user_one;
  17.     this.user_two = user_two;
  18.     this.griev_desc_array = griev_desc_array;
  19.     this.reply_array_emp = reply_array_emp;
  20.     this.reply_array_hr = reply_array_hr;
  21. }
  23. @Override
  24. public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
  25.     View view;
  27.     System.out.println("top of for onCreateView");
  28.     //for(String s : user_id_array)
  29.     for(int i =0;i<user_id_array.size();i++)
  30.     {
  31.         System.out.println("in side for");
  32.         if(user_id_array.get(i).equals(user_one)){
  33.         //if(!s.equals(user_one)){
  34.             //System.out.println("in side if onCreateViewHolder"+s);
  35.             System.out.println("in side if onCreateViewHolder"+user_id_array.get(i));
  36.             view = LayoutInflater.from(parent.getContext()).inflate(R.layout.model_emp_conv, parent, false);
  37.             return new EmployeeViewHolder(view);
  38.         }else if(user_id_array.get(i).equals(user_two)){
  39.             //System.out.println("in side else if onCreateViewHolder"+s);
  40.             System.out.println("in side if onCreateViewHolder"+user_id_array.get(i));
  41.             view = LayoutInflater.from(parent.getContext()).inflate(R.layout.model_hr_conv, parent, false);
  42.             return new HrViewHolder(view);
  43.         }
  44.         else
  45.         {
  46.             //System.out.println("in side else onCreateViewHolder"+s);
  47.             System.out.println("in side if onCreateViewHolder"+user_id_array.get(i));
  48.         }
  49.     }
  50.     return null;
  51. }
  53. @Override
  54. public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
  56.     System.out.println("top of for");
  57.     //for(String s : user_id_array)
  58.     for(int i =0;i<user_id_array.size();i++)
  59.     {
  60.         System.out.println("in side for");
  61.         if(user_id_array.get(i).equals(user_one)){
  62.             System.out.println("in side if onBindViewHolder"+ user_id_array.get(i));
  63.             //System.out.println("in side if onBindViewHolder"+s);
  64.             //holder.employee_conversation.setText(reply_array_emp.get(position));
  65.             ((EmployeeViewHolder)holder).employee_conversation.setText(reply_array_emp.get(position));
  67.         }else if(user_id_array.get(i).equals(user_two)){
  68.             //System.out.println("in side else if onBindViewHolder"+s);
  69.             System.out.println("in side if onBindViewHolder"+user_id_array.get(i));
  70.             ((HrViewHolder) holder).hr_conversation.setText(reply_array_hr.get(position));
  71.         }
  72.         else
  73.         {
  74.             //System.out.println("in side else onBindViewHolder"+s);
  75.         }
  76.     }
  78. }
  80. @Override
  81. public int getItemCount() {
  82.     return user_id_array.size();
  83. }

}
但是，我仍然无法对这两种布局进行充气，因为我在以下方面遇到了一个错误：

  1. ((HrViewHolder) holder).hr_conversation.setText(reply_array_hr.get(position));

说打字不可能。
其他两个持有人类别为：

  1. public class HrViewHolder extends RecyclerView.ViewHolder {
  2. TextView hr_conversation;
  4. public HrViewHolder(View itemView) {
  5.     super(itemView);
  6.     hr_conversation =(TextView) itemView.findViewById(R.id.hr_conversation);
  7.     System.out.println("in hrViewHolder");
  8. }

}
和

  1. public class EmployeeViewHolder extends RecyclerView.ViewHolder {
  3. TextView employee_conversation;
  5. public EmployeeViewHolder(View itemView) {
  6.     super(itemView);
  7.     employee_conversation=(TextView) itemView.findViewById(R.id.employee_conversation);
  8.     System.out.println("in employeeViewHolder");
  9. }

}
我将代码修改为：

  1. public class DifferentRowAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{
  3. String user_one;
  4. String user_two;
  5. ArrayList<String> user_id_array;
  6. ArrayList<String> griev_desc_array;
  7. ArrayList<String> reply_array_emp;
  8. ArrayList<String> reply_array_hr;
  9. Context c;
  11. public DifferentRowAdapter(Context c, String user_one, String user_two,
  12.                            ArrayList<String> user_id_array, ArrayList<String> griev_desc_array,
  13.                            ArrayList<String> reply_array_emp, ArrayList<String> reply_array_hr) {
  14.     this.c =c ;
  15.     this.user_id_array = user_id_array;
  16.     this.user_one = user_one;
  17.     this.user_two = user_two;
  18.     this.griev_desc_array = griev_desc_array;
  19.     this.reply_array_emp = reply_array_emp;
  20.     this.reply_array_hr = reply_array_hr;
  21. }
  23. @Override
  24. public int getItemViewType(int position) {
  25.     for(String s: user_id_array)
  26.     {
  27.         if(s.equals(user_one))
  28.         {
  29.             return Integer.parseInt(user_one);
  30.         }
  31.         else if(s.equals(user_two))
  32.             return Integer.parseInt(user_two);
  33.         else
  34.             return 3;
  35.     }
  37.     return 0;
  38. }
  40. @Override
  41. public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
  42.     View view;
  44.     System.out.println("top of for onCreateView");
  46.     switch (viewType)
  47.     {
  48.         case 1 :
  49.             System.out.println("in side case 1 onCreateViewHolder viewType     "+ viewType);
  50.             view = LayoutInflater.from(parent.getContext()).inflate(R.layout.model_emp_conv, parent, false);
  51.             return new EmployeeViewHolder(view);
  52.         case 2:
  53.             System.out.println("in side case 2 onCreateViewHolder viewType     "+ viewType);
  54.             view = LayoutInflater.from(parent.getContext()).inflate(R.layout.model_hr_conv, parent, false);
  55.             return new HrViewHolder(view);
  57.     }
  58.     return null;
  59. }
  61. @Override
  62. public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
  64.     System.out.println("top of for");
  65.     //for(String s : user_id_array)
  66.     for(int i =0;i<user_id_array.size();i++)
  67.     {
  68.         System.out.println("in side for");
  69.         if(user_id_array.get(i).equals(user_one)){
  70.             System.out.println("in side if onBindViewHolder"+ user_id_array.get(i));
  71.             //System.out.println("in side if onBindViewHolder"+s);
  72.             //holder.employee_conversation.setText(reply_array_emp.get(position));
  73.             //((EmployeeViewHolder)holder).employee_conversation.setText(reply_array_emp.get(position));
  75.         }else if(user_id_array.get(i).equals(user_two)){
  76.             //System.out.println("in side else if onBindViewHolder"+s);
  77.             System.out.println("in side if onBindViewHolder"+user_id_array.get(i));
  78.             //((HrViewHolder) holder).hr_conversation.setText(reply_array_hr.get(position));
  79.         }
  80.         else
  81.         {
  82.             //System.out.println("in side else onBindViewHolder"+s);
  83.         }
  84.     }
  86. }
  88. @Override
  89. public int getItemCount() {
  90.     return user_id_array.size();
  91. }

}

mysqlandroidandroid-recyclerview

2条答案

按热度按时间
nhjlsmyf

nhjlsmyf1#

首先，数组中不需要for循环，因为传递了视图的位置，所以可以安全地将其修改为

  1. @Override
  2. public int getItemViewType(int position) {
  3.         if(user_id_array.get(position).equals(user_one))
  4.             return 1;
  5.         else if(user_id_array.get(position).equals(user_two))
  6.             return 2;
  7.         else
  8.             return 3;
  9. }

这同样适用于 onBindViewHolder ，在那里你有 ViewHolder 示例作为参数传递，因此您需要在运行时检查其类型以了解要绑定到的布局（使用 instanceof 操作员）。

  1. @Override
  2. public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
  4.     if (holder instanceof EmployeeViewHolder) {
  5.         System.out.println("in side for");
  6.         System.out.println("in side if onBindViewHolder"+ user_id_array.get(position));
  7.             //System.out.println("in side if onBindViewHolder"+s);
  8.             //holder.employee_conversation.setText(reply_array_emp.get(position));
  9.             ((EmployeeViewHolder)holder).employee_conversation.setText(reply_array_emp.get(position));
  11.     } else if(holder instanceof HrViewHolder){
  12.         //System.out.println("in side else if onBindViewHolder"+s);
  13.         System.out.println("in side if onBindViewHolder"+user_id_array.get(position));
  14.         ((HrViewHolder) holder).hr_conversation.setText(reply_array_hr.get(position));
  15.     } else {
  16.         //System.out.println("in side else onBindViewHolder"+s);
  17.     }
  18. }

希望这有帮助！

展开查看全部
赞(0）分享  回复(0）举报  2021-06-21
mrfwxfqh

mrfwxfqh2#

重写适配器中的getitemviewtype（）。然后基于oncreateviewholder中的viewtype参数返回viewholder。
我希望下面的链接能帮助您在recycleview适配器中进行多布局：

赞(0）分享  回复(0）举报  2021-06-21
我来回答

相关问题

    查看更多

    热门标签

    更多
    JavaquerypythonNode开发语言requestUtil数据库Table后端算法LoggerMessageElementParser

    最新问答

    更多
    • 蜀ICP备13028337号-1 大数据知识库 https://www.saoniuhuo.com © All rights reserved
    • 本站内容来源互联网,如果侵犯您的权益请联系我们删除, 联系方式：448109455@qq.com