自定义数组超级方法不接受该列表。

huangapple
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英文:

Custom array super method not accepting the list

问题

我创建了一个自定义的列表适配器，有两个构造函数，分别传递了两个不同的列表给构造函数的super方法。一个super方法接受列表，另一个super方法不接受列表，我得到了一个红色波浪线。悬停在上面没有解释任何内容，错误图像快照已附上。

列表适配器代码：

  1. public class ListAdapter extends ArrayAdapter<Cats> {
  2.     
  3.     // 列表中的值，类型为PlantTags的列表
  4.     List<PlantTags> tags;
  5.     List<Cats> categories;
  7.     boolean childFragment;
  8.     int categoryId;
  10.     // 上下文
  11.     Context context;
  13.     // 列表项的布局资源文件
  14.     int resource;
  16.     // 初始化值的构造函数
  17.     public ListAdapter(Context context, int resource, List<PlantTags> tags, boolean childFragment) {
  18.         super(context, resource, tags);
  19.         this.context = context;
  20.         this.resource = resource;
  21.         this.childFragment = childFragment;
  22.         this.tags = tags;
  23.     }
  25.     // 初始化值的构造函数
  26.     public ListAdapter(Context context, int resource, List<Cats> cats, boolean childFragment, int categoryId) {
  27.         super(context, resource, cats);
  28.         this.context = context;
  29.         this.resource = resource;
  30.         this.childFragment = childFragment;
  31.         this.categories = cats;
  32.         this.categoryId = categoryId;
  33.     }
  35.     // 返回ListView项作为View
  36.     @NonNull
  37.     @Override
  38.     public View getView(final int position, @Nullable View convertView, @NonNull ViewGroup parent) {
  40.         // 我们需要获取列表项的xml视图
  41.         // 为此，我们需要一个LayoutInflater
  42.         LayoutInflater layoutInflater = LayoutInflater.from(context);
  44.         // 获取视图
  45.         View view = layoutInflater.inflate(resource, null, false);
  47.         // 从视图中获取列表项的视图元素
  48.         ImageView imageView = view.findViewById(R.id.imageView);
  49.         TextView textViewName = view.findViewById(R.id.category_name);
  51.         if (!childFragment) {
  52.             // 获取指定位置的Cats对象
  53.             Cats hero = categories.get(position);
  54.             // 将值添加到列表项
  55.             textViewName.setText(hero.getTitle());
  57.         } else {
  58.             // 获取指定位置的PlantTags对象
  59.             PlantTags tag = tags.get(position);
  60.             // 将值添加到列表项
  61.             if (tag.getCategoryId() == categoryId) {
  62.                 textViewName.setText(tag.getTitle());
  63.             }
  64.         }
  66.         return view;
  67.     }
  68. }

PlantTags的POJO模型：

  1. public class PlantTags {
  3.     @Expose
  4.     @SerializedName("Title")
  5.     private String Title;
  6.     @Expose
  7.     @SerializedName("CategoryId")
  8.     private int CategoryId;
  9.     @Expose
  10.     @SerializedName("Id")
  11.     private int Id;
  12.     @Expose
  13.     @SerializedName("$id")
  14.     private String $id;
  16.     public String getTitle() {
  17.         return Title;
  18.     }
  20.     public void setTitle(String Title) {
  21.         this.Title = Title;
  22.     }
  24.     public int getCategoryId() {
  25.         return CategoryId;
  26.     }
  28.     public void setCategoryId(int CategoryId) {
  29.         this.CategoryId = CategoryId;
  30.     }
  32.     public int getId() {
  33.         return Id;
  34.     }
  36.     public void setId(int Id) {
  37.         this.Id = Id;
  38.     }
  40.     public String get$id() {
  41.         return $id;
  42.     }
  44.     public void set$id(String $id) {
  45.         this.$id = $id;
  46.     }
  47. }

错误：
自定义数组超级方法不接受该列表。

有人可以解释问题出在哪里吗？
1: https://i.stack.imgur.com/B2Y4W.png

英文:

I have created a custom list adapter, i have two constructors, passing two different lists to super methods of constructor. One super method taking list, the other super method doesn't take the list, i am getting swiggly red line. Hovering on it doesn't explain anything, error image snapshot is attached.

List adapter code

  1. public class ListAdapter extends ArrayAdapter&lt;Cats&gt; {
  2. //the list values in the List of type hero
  3. List&lt;PlantTags&gt; tags;
  4. List&lt;Cats&gt; categories;
  5. boolean childFragment;
  6. int categoryId;
  7. //activity context
  8. Context context;
  9. //the layout resource file for the list items
  10. int resource;
  11. //constructor initializing the values
  12. public ListAdapter(Context context, int resource, List&lt;PlantTags&gt; tags, boolean childFragment) {
  13. super(context, resource, tags);
  14. this.context = context;
  15. this.resource = resource;
  16. this.childFragment = childFragment;
  17. this.tags = tags;
  18. }
  19. //constructor initializing the values
  20. public ListAdapter(Context context, int resource, List&lt;Cats&gt; cats, boolean childFragment, int categoryId) {
  21. super(context, resource, cats);
  22. this.context = context;
  23. this.resource = resource;
  24. this.childFragment = childFragment;
  25. this.categories = cats;
  26. this.categoryId = categoryId;
  27. }
  28. //this will return the ListView Item as a View
  29. @NonNull
  30. @Override
  31. public View getView(final int position, @Nullable View convertView, @NonNull ViewGroup parent) {
  32. //we need to get the view of the xml for our list item
  33. //And for this we need a layoutinflater
  34. LayoutInflater layoutInflater = LayoutInflater.from(context);
  35. //getting the view
  36. View view = layoutInflater.inflate(resource, null, false);
  37. //getting the view elements of the list from the view
  38. ImageView imageView = view.findViewById(R.id.imageView);
  39. TextView textViewName = view.findViewById(R.id.category_name);
  40. if (!childFragment) {
  41. //getting the hero of the specified position
  42. Cats hero = categories.get(position);
  43. //adding values to the list item
  44. textViewName.setText(hero.getTitle());
  45. } else {
  46. //getting the hero of the specified position
  47. PlantTags tag = tags.get(position);
  48. //adding values to the list item
  49. if (tag.getCategoryId() == categoryId) {
  50. textViewName.setText(tag.getTitle());
  51. }
  52. }
  53. return view;
  54. }
  55. }

** Pojo model for PlantTags **

  1. public class PlantTags {
  2. @Expose
  3. @SerializedName(&quot;Title&quot;)
  4. private String Title;
  5. @Expose
  6. @SerializedName(&quot;CategoryId&quot;)
  7. private int CategoryId;
  8. @Expose
  9. @SerializedName(&quot;Id&quot;)
  10. private int Id;
  11. @Expose
  12. @SerializedName(&quot;$id&quot;)
  13. private String $id;
  14. public String getTitle() {
  15. return Title;
  16. }
  17. public void setTitle(String Title) {
  18. this.Title = Title;
  19. }
  20. public int getCategoryId() {
  21. return CategoryId;
  22. }
  23. public void setCategoryId(int CategoryId) {
  24. this.CategoryId = CategoryId;
  25. }
  26. public int getId() {
  27. return Id;
  28. }
  29. public void setId(int Id) {
  30. this.Id = Id;
  31. }
  32. public String get$id() {
  33. return $id;
  34. }
  35. public void set$id(String $id) {
  36. this.$id = $id;
  37. }
  38. }

error
自定义数组超级方法不接受该列表。

can anyone explain where the problem is?

答案1

得分: 1

你的超类构造函数必须接受四个或五个参数之一：

  1. public ListAdapter(Context context, int resource, List<PlantTags> tags, boolean childFragment)

或者

  1. public ListAdapter(Context context, int resource, List<Cats> cats, boolean childFragment, int categoryId)

你需要填充所有四到五个参数，或者创建一个带有较少参数的新构造函数。

  1. super(context, resource, tags)

永远不会起作用，因为你试图调用的构造函数（带有三个参数的那个）不存在。

英文:

Your superclass constructor has to take either four or five parameters being:

  1. public ListAdapter(Context context, int resource, List&lt;PlantTags&gt; tags, boolean childFragment)

or

  1. public ListAdapter(Context context, int resource, List&lt;Cats&gt; cats, boolean childFragment, int categoryId)

You need to fill all four-five parameters or create a new constructor with less.

  1. super(context, resource, tags)

Will never work since the constructor that you are trying to call (one with three parameters) does not exist.

答案2

得分: 0

简单的ArrayAdapter据我所知不能接受两个列表。我选择了RecycleView适配器，并且替换了适配器，现在我可以在RecycleView的构造函数中传递任意多的列表。关于这方面有很多代码可用。因此，在这里只是提供一个备选方案。

英文:

Simple ArrayAdapter does not accept two lists as far as i know. I have opted for RecycleView adapter and replaced adapter and i can now pass as many lists as i want in the constructor of recycleview. There are many code available for that. So just suggestion an alternate solution here.

huangapple
  • 本文由 发表于 2020年9月16日 07:19:06
  • 转载请务必保留本文链接：https://go.coder-hub.com/63911072.html
  • android
  • java
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