Question

我正在将Android Image Slider与Glide一起使用，制作图像轮播，并且尝试测试是否可以在将URL添加到适配器时实现ArrayList，但是当我将URL添加到ArrayList时，其他数据不显示，仅显示数组中的最后一个。看来我无法将URL存储到SliderItem的值。为什么其他图像没有显示在Slider上？

我使用了Android Image Slider的默认适配器：SliderAdapterExample.java。

Home.java

SliderItem sliderItem = new SliderItem();

    ArrayList<String> urls = new ArrayList<>();
    urls.add("https://lh3.googleusercontent.com/proxy/xdswuBCXXazoCcJ9t9c0y1DqcEU8Ixog4B6Q2MJaE3Iy84VV7g8GOS8C5b9JgTlFRGg23q_Rjw61Tr68A0mJ9ZnoqJdxPLLvCCZteQBOcaW61KEOQA");
    urls.add("https://www.luxuryproperty.com/uploads/images/6-bedroom-villa-for-sale-dubai_hills_mansions-LP0542-9ea75fa49452780.jpg");
    urls.add("https://www.luxuryproperty.com/uploads/images/7-bedroom-villa-for-sale-dubai_hills_mansions-LP0514-261aafdf24310c00.jpg");

    for(int i = 0; i < urls.size(); i++){
        sliderItem.setDescription("Slider Item Added Manually");
        sliderItem.setImageUrl(urls.get(i));
    }

    adapter.addItem(sliderItem);

SliderItem.java

public class SliderItem {
private String description;
private String imageUrl;

public String getDescription() {
    return description;
}

public void setDescription(String description) {
    this.description = description;
}

public String getImageUrl() {
    return imageUrl;
}

public void setImageUrl(String imageUrl) {
    this.imageUrl = imageUrl;
}}

这就是我现在得到的。仅最后一个链接有效。参见下图：

https://www.luxuryproperty.com/uploads/images/7-bedroom-villa-for-sale-dubai_hills_mansions-LP0514-261aafdf24310c00.jpg

Answer 1

您需要在adapter.addItem(sliderItem);循环内移动for。

    SliderItem sliderItem = new SliderItem();

    ArrayList<String> urls = new ArrayList<>();
    urls.add("https://lh3.googleusercontent.com/proxy/xdswuBCXXazoCcJ9t9c0y1DqcEU8Ixog4B6Q2MJaE3Iy84VV7g8GOS8C5b9JgTlFRGg23q_Rjw61Tr68A0mJ9ZnoqJdxPLLvCCZteQBOcaW61KEOQA");
    urls.add("https://www.luxuryproperty.com/uploads/images/6-bedroom-villa-for-sale-dubai_hills_mansions-LP0542-9ea75fa49452780.jpg");
    urls.add("https://www.luxuryproperty.com/uploads/images/7-bedroom-villa-for-sale-dubai_hills_mansions-LP0514-261aafdf24310c00.jpg");

    for(int i = 0; i < urls.size(); i++){
        sliderItem.setDescription("Slider Item Added Manually");
        sliderItem.setImageUrl(urls.get(i));

        // here
        adapter.addItem(sliderItem);
    }

或

    ArrayList<String> urls = new ArrayList<>();
    urls.add("https://lh3.googleusercontent.com/proxy/xdswuBCXXazoCcJ9t9c0y1DqcEU8Ixog4B6Q2MJaE3Iy84VV7g8GOS8C5b9JgTlFRGg23q_Rjw61Tr68A0mJ9ZnoqJdxPLLvCCZteQBOcaW61KEOQA");
    urls.add("https://www.luxuryproperty.com/uploads/images/6-bedroom-villa-for-sale-dubai_hills_mansions-LP0542-9ea75fa49452780.jpg");
    urls.add("https://www.luxuryproperty.com/uploads/images/7-bedroom-villa-for-sale-dubai_hills_mansions-LP0514-261aafdf24310c00.jpg");

    for(int i = 0; i < urls.size(); i++){
        SliderItem sliderItem = new SliderItem();
        sliderItem.setDescription("Slider Item Added Manually");
        sliderItem.setImageUrl(urls.get(i));

        // here
        adapter.addItem(sliderItem);
    }

根据您的代码，您有3个网址，因此需要3个SliderItem。但是，如果将adapter.addItem(sliderItem);放在for循环之外，则只能获得最后一个SliderItem

此外，每次将项目添加到适配器时，都需要将adapter.notifyDataSetChanged()设置为addItem()。

如果我的解决方案有任何问题，请让我知道。

使用图像滑块制作图像轮播

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