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如何将 Retrofit 中的信息实现到 viewPager2 布局小部件中

如何解决如何将 Retrofit 中的信息实现到 viewPager2 布局小部件中

所以我正在构建这个 Carousel 项目,它在应用程序上显示图像和一些文本。我已经通过构建原型来降低结构。我也能够使用 Retrofit 从我的终端上的 RestAPI 调用信息。但是我真正陷入困境的是试图让信息显示在容器中,我希望它显示的地方。我尝试了很多方法解决它,但都无济于事。下面是我现在拥有的代码,它显示了我放入其中的图像和文本。随着改造类。我已经做了三天了,我不知道该怎么办。如果有人有想法或可以提供帮助,我将不胜感激。

API(改造)

package com.examples.carousel.api

import com.examples.carousel.CarouselItem
import com.examples.carousel.utli.Constants.Companion.BASE_URL
import retrofit2.Call
import retrofit2.Retrofit
import retrofit2.converter.gson.GsonConverterFactory
import retrofit2.http.GET

interface FlickrApi {
    @GET("services/rest/?method=flickr.interestingness.getList" +
            "&api_key=(private)" +
            "&format=json" +
            "&nojsoncallback=1" +
            "&extras=url_s")

     fun getCarouselItem() : Call<List<CarouselItem>>

    companion object {
        fun create() : FlickrApi {

            val retrofit = Retrofit.Builder()
                .addConverterFactory(GsonConverterFactory.create())
                .baseUrl(BASE_URL)
                .build()
            return retrofit.create(FlickrApi::class.java)
        }
    }
}

模型(注释掉的代码是我想从api中获取的信息)

package com.examples.carousel


data class CarouselItem internal constructor(
//    var title: String,//    var id: String,//    var url_s: String

    var image: Int,var title2: String
    ) {

}

适配器

package com.examples.carousel

import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import androidx.viewpager2.widget.ViewPager2
import com.bumptech.glide.Glide
import com.makeramen.roundedimageview.RoundedImageView


class ItemAdapter internal constructor(carouselItems: MutableList<CarouselItem>,viewPager2: ViewPager2) : RecyclerView.Adapter<ItemAdapter.ItemPagerViewHolder>() {


    private val carouselItems: List<CarouselItem>
    private val viewPager2: ViewPager2

    init {
        this.carouselItems = carouselItems
        this.viewPager2 = viewPager2
    }

    class ItemPagerViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        private val photo: RoundedImageView = itemView.findViewById(R.id.picture)
        private val title: TextView = itemView.findViewById(R.id.photo_name)

        fun image(carouselItem: CarouselItem) {
            photo.setimageResource(carouselItem.image)
        }

        fun text(carouselItem: CarouselItem) {
            title.text = carouselItem.title2
        }

            }

    override fun onCreateViewHolder(parent: ViewGroup,viewType: Int): ItemPagerViewHolder {
        return ItemPagerViewHolder(
            LayoutInflater.from(parent.context).inflate(
                R.layout.carousel_item_container,parent,false
            )
        )
    }

    override fun onBindViewHolder(holder: ItemPagerViewHolder,position: Int) {
        holder.image(carouselItems[position])
        holder.text(carouselItems[position])
        if (position == carouselItems.size - 2) {
            viewPager2.post(runnable)
        }
    }

    override fun getItemCount(): Int {
        return carouselItems.size
    }

    private val runnable = Runnable {
        carouselItems.addAll(carouselItems)
        notifyDataSetChanged()
    }
}

主活动

package com.examples.carousel


import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.RecyclerView
import androidx.viewpager2.widget.CompositePageTransformer
import androidx.viewpager2.widget.MarginPageTransformer
import androidx.viewpager2.widget.ViewPager2
import com.examples.carousel.api.FlickrApi
import com.makeramen.roundedimageview.RoundedImageView
import retrofit2.Call
import retrofit2.Callback
import retrofit2.Response
import kotlin.math.abs


class CarouselActivity : AppCompatActivity() {


    lateinit var viewPager: ViewPager2


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_carousel)

        viewPager = findViewById(R.id.viewPager_ImageSlider)
        supportActionBar?.hide()


        val multipleItems: MutableList<CarouselItem> = ArrayList()
        multipleItems.add(CarouselItem(R.drawable.bcw_38,"Image 1"))
        multipleItems.add(CarouselItem(R.drawable.bcw_39,"Image 2"))
        multipleItems.add(CarouselItem(R.drawable.bcw_40,"Image 3"))
        multipleItems.add(CarouselItem(R.drawable.bcw_45,"Image 4"))
        multipleItems.add(CarouselItem(R.drawable.bcw_50,"Image 5"))
        multipleItems.add(CarouselItem(R.drawable.bcw_53,"Image 6"))


        viewPager.adapter = ItemAdapter(multipleItems,viewPager)

        viewPager.clipToPadding = false
        viewPager.clipChildren = false
        viewPager.offscreenPageLimit = 3
        viewPager.getChildAt(0).overScrollMode = RecyclerView.OVER_SCROLL_NEVER

        val compositePageTransformer = CompositePageTransformer()
        compositePageTransformer.addTransformer(MarginPageTransformer(30))
        compositePageTransformer.addTransformer { page,position ->
            val r = 1 - abs(position)
            page.scaleY = 0.85f + r * 0.25f
        }

        viewPager.setPageTransformer(compositePageTransformer)

//
//        val apiInterface = FlickrApi.create().getCarouselItem()
//
//        apiInterface.enqueue(object: Callback<List<CarouselItem>> {
//            override fun onFailure(call: Call<List<CarouselItem>>,t: Throwable) {
//
//            }
//
//            override fun onResponse(call: Call<List<CarouselItem>>,response: Response<List<CarouselItem>>) {
//
//                if (response.body() != null){
//                  itemAdapter.setItemListItems(response.body()!!)
//
//                }
//            }
//        })


    }

}

XML 文件

ViewPager2 布局

<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
                                                   xmlns:app="http://schemas.android.com/apk/res-auto"
                                                   xmlns:tools="http://schemas.android.com/tools"
                                                   android:layout_width="match_parent"
                                                   android:layout_height="match_parent" android:background="#232323"
                                                   android:id="@+id/linearLayout">

    <androidx.viewpager2.widget.ViewPager2
            android:id="@+id/viewPager_ImageSlider"
            android:layout_height="0dp"
            android:layout_width="0dp"
            android:paddingStart="70dp"
            android:paddingEnd="70dp"
            app:layout_constraintEnd_toEndOf="parent" app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintBottom_toBottomOf="parent" android:layout_marginTop="80dp"/>
    <TextView
            android:text="@string/osa_playlist"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:id="@+id/textView2"
            app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" android:layout_marginTop="40dp"
            android:textColor="@color/white" android:textSize="25sp"/>

</androidx.constraintlayout.widget.ConstraintLayout>

容器

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent" android:id="@+id/container" android:background="#232323">
    <com.makeramen.roundedimageview.RoundedImageView
            android:layout_width="match_parent"
            android:layout_height="550dp" app:layout_constraintTop_toTopOf="parent" android:id="@+id/picture"
            android:adjustViewBounds="true"
            app:riv_corner_radius="12dp" tools:layout_editor_absoluteX="0dp"/>
    <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content" android:id="@+id/photo_name"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent" android:layout_marginLeft="8dp"
            android:layout_marginStart="8dp" android:layout_marginRight="8dp" android:layout_marginEnd="8dp"
            android:textStyle="bold"
            tools:text="TEXT TEXT" android:textSize="36sp" android:textColor="@color/white" android:gravity="center"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintTop_toBottomOf="@+id/picture" app:layout_constraintBottom_toBottomOf="parent"
            android:layout_marginBottom="230dp"/>

</androidx.constraintlayout.widget.ConstraintLayout>

依赖关系

dependencies {

    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
    implementation 'androidx.core:core-ktx:1.3.2'
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
    implementation 'com.google.android.material:material:1.3.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'

    //For the Carousel Container
    implementation 'androidx.viewpager2:viewpager2:1.0.0'
    implementation 'com.makeramen:roundedimageview:2.3.0'

    //For Retrofit and Gson
    implementation 'com.squareup.retrofit2:retrofit:2.9.0'
//    implementation 'com.squareup.retrofit2:converter-scalars:2.5.0'
//    implementation 'com.google.code.gson:gson:2.8.6'
    implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
    implementation 'com.squareup.okhttp3:okhttp:4.9.0'
    testImplementation 'junit:junit:4.13.2'

    // Coroutines
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.4.2'
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.4.1'
    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1'
    implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.1'


    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
    implementation 'com.github.bumptech.glide:glide:4.12.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.12.0'
    } 

*这不是互联网许可,它已经在那里了。

解决方法

itemAdapter.setItemListItems(response.body()!!) 而不是调用适配器方法,编写自己的更新列表的方法:
私人 val carouselItems:列表, 使此列表可变并写入方法:

public fun updateList(val items: List<CarouselItem>){
   carouselItems.clear()
   carouselItems.addAll(items)
   notifyDataSetChanged()
}

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