如何使用数据模型从firebase实时数据库检索数据？

这本书有多个数据 第章有多个数据 Verse有多个数据

我的模型和firebase数据库如下所示，我如何在模型中按章节检索所有数据

Class Model_bible(
 val book_array:List<Model_bible_bible_array>?=null
){}

Class Model_bible_bible_array(
 val book_array:HasMap<String,Model_bible_chapter>?=null
){}

Class Model_bible_chapter(
 val book_array:List<Model_bible_chapter_hasmap>?=null
){}

Class Model_bible_chapter_hasmap(
 val book_array:HasMap<String,Model_bible_Verse_array>?=null
){}

Class Model_Model_bible_Verse_array(
 val book_array:List<Verse_data>?=null
){}

Class Verse_data(
 val Verse:String = "",
 Val Verse_id:String = ""
){}

---

如果我没弄错的话，从Firebase右上角的实时数据库下载JSON。将JSON内容粘贴到这里，它将生成适当的模型结构

以下是Kotlin数据类模型：

import kotlinx.serialization.Serializable

@Serializable
data class SomeTestModelClass(
    val img: List<Img?>? = null
) {
    @Serializable
    data class Img(
        val imagedata: List<Imagedata?>? = null,
        val imgdata: List<Imgdata?>? = null
    ) {
        @Serializable
        data class Imagedata(
            val `data`: List<Data?>? = null
        ) {
            @Serializable
            data class Data(
                val img: String? = null
            )
        }

        @Serializable
        data class Imgdata(
            val `data`: List<Data?>? = null
        ) {
            @Serializable
            data class Data(
                val img: String? = null
            )
        }
    }
}

---

它正在使用库。

使用下面的模型获取我的所有数据

Java POJO类和Kotlin

@Serializable()
public class Example {

    @SerializedName("Book")
    @Expose
    private List<Book> book = null;

    public List<Book> getBook() {
        return book;
    }

    public void setBook(List<Book> book) {
        this.book = book;
    }

    @Serializable
    public class Book {
        @SerializedName("Chapter")
        @Expose

        private List<Chapter> chapter = null;

        public List<Chapter> getChapter() {
            return chapter;
        }

        public void setChapter(List<Chapter> chapter) {
            this.chapter = chapter;
        }

        @Serializable
        public class Chapter {

            @SerializedName("Verse")
            @Expose
            private List<Verse> verse = null;

            public List<Verse> getVerse() {
                return verse;
            }

            public void setVerse(List<Verse> verse) {
                this.verse = verse;
            }

            @Serializable
            public class Verse {

                @SerializedName("Verseid")
                @Expose
                private String verseid;
                @SerializedName("Verse")
                @Expose

                private String verse;

                public String getVerseid() {
                    return verseid;
                }

                public void setVerseid(String verseid) {
                    this.verseid = verseid;
                }

                public String getVerse() {
                    return verse;
                }

                public void setVerse(String verse) {
                    this.verse = verse;
                }

            }
        }
    }
}

数据类和kotlin代码

@Serializable
data class SomeTestModelClass(
    @SerializedName("Book")
    val Book: List<Img?>? = null
) {
    @Serializable
    data class Img(
        @SerializedName("Chapter")
        val Chapter: List<Imagedata?>? = null
    ) {
        @Serializable
        data class Imagedata(
            @SerializedName("Verse")
            val Verse: List<Data?>? = null
        ) {
            @Serializable
            data class Data(
                @SerializedName("Verseid")
                val Verseid: String? = null,
                @SerializedName("Verse")
                val Verse: String? = null
            )
        }

    }
}

---

请不要显示代码的图片。最好是将代码复制到问题中并格式化，以便更容易阅读和搜索。这就等于给空值。pojo类未生成您是否可以通过Firebase下载的JSON文件的内容？{img:[{imgdata:[{data:[{img:wallpaper image.jpg}，{img:wallpaper image.jpg}，{img:wallpaper image.jpg}，{data:[{img:wallpaper image.jpg}，}https://ansunibaate.com/wp-content/uploads/2019/04/lion-wallpaper-image.jpg},{img:https://ansunibaate.com/wp-content/uploads/2019/04/lion-wallpaper-image.jpg}]}]}，{imagedata:[{data:[{img:https://ansunibaate.com/wp-content/uploads/2019/04/lion-wallpaper-image.jpg}，{img:https://ansunibaate.com/wp-content/uploads/2019/04/lion-wallpaper-image.jpg}]}]}]}嘿，谢谢你的建议，我会修改你的代码，我会得到我们@Webfreak的所有数据

@Serializable
data class SomeTestModelClass(
    @SerializedName("Book")
    val Book: List<Img?>? = null
) {
    @Serializable
    data class Img(
        @SerializedName("Chapter")
        val Chapter: List<Imagedata?>? = null
    ) {
        @Serializable
        data class Imagedata(
            @SerializedName("Verse")
            val Verse: List<Data?>? = null
        ) {
            @Serializable
            data class Data(
                @SerializedName("Verseid")
                val Verseid: String? = null,
                @SerializedName("Verse")
                val Verse: String? = null
            )
        }

    }
}

 query.addListenerForSingleValueEvent(object : ValueEventListener {

            override fun onDataChange(dataSnapshot: DataSnapshot) {
                val jsonString = gson?.toJson(dataSnapshot.value)
                val staff: SomeTestModelClass = gson!!.fromJson(jsonString, SomeTestModelClass::class.java)
                Log.d("data",staff.toString())
            }

            override fun onCancelled(error: DatabaseError) {
                // Failed to read value
            }
        })