java - AdapterViewPager添加urlImage 3次问题 - AndroidX

Question

我应该从ArrayJson获取ImageDisplay，它将访问API 3次该函数将发送 urlimage 3 次

for(i=0; i<3; i++){send(UrlImage);}

这有效

private void getViewYoyo(){
    String[] str = new String[3];
    adapterViewPagerHot = new AdapterViewPagerHot(getActivity(), str);


    str[0]="https://scx1.b-cdn.net/csz/news/800/2019/1-nasastessmis.jpg";
    str[1]="https://i.chzbgr.com/full/8803531264/hD42E57C6/";
    str[2]="https://scx1.b-cdn.net/csz/news/800/2019/1-nasastessmis.jpg";
    viewPager.setAdapter(adapterViewPagerHot);
}

但这不起作用

public void getHighlightMainActivity(int ReceivedDummyUrutan, int ReceivedTotalThread, int ReceivedDummyID, String ReceivedDummyTitle, String ReceivedDummyPublishTime, String ReceivedDummyImageOri, String ReceivedDummyShortDescription){
    String[] str = new String[ReceivedTotalThread];
    adapterViewPagerHot = new AdapterViewPagerHot(getActivity(), str);
    if(ReceivedDummyUrutan==0)
        str[0]=ReceivedDummyImageOri;
    if(ReceivedDummyUrutan==1)
        str[1]=ReceivedDummyImageOri;
    if(ReceivedDummyUrutan==2)
        str[2]=ReceivedDummyImageOri;

    if(ReceivedDummyUrutan==ReceivedTotalThread-1) {
        viewPager.setAdapter(adapterViewPagerHot);
    }
}

这是adapterViewPager.java

public class AdapterViewPagerHot extends PagerAdapter {

private Context mContext;
private LayoutInflater layoutInflater;
/*private Integer[] images = {R.drawable.cat_mermaid_cartoon_grumpy_cat_94004_1280x720,R.drawable.catnrobot,R.drawable.kleptocats,R.drawable.magiccat,R.drawable.flyingcat};*/
public String image_url[];

public AdapterViewPagerHot(Context context, String[] list) {
    this.mContext = context;
    this.image_url = list;
}

@Override
public int getCount() {
    return image_url.length;
}

public void setUrls(String[] list){
    this.image_url = list;
}



@Override
public boolean isViewFromObject(View view, Object object) {
    return view == object;
}



public View vi;
@Override
public Object instantiateItem(ViewGroup container, final int position) {

    layoutInflater = (LayoutInflater) this.mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    vi = layoutInflater.inflate(R.layout.item_viewpagerdisplay, null);

    final Context sContext = mContext;
    ImageView imageView = vi.findViewById(R.id.imageView);
    final ImageView ICONHotViewPagerSaving = vi.findViewById(R.id.ICON_HotViewPagerSaving);
    /*imageView.setImageResource(images[position]);*/
    Glide.with(sContext).load(image_url[position]).into(imageView);


    vi.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
                Toast.makeText(sContext, "Slide" + (position+1) + "Clicked", Toast.LENGTH_SHORT).show();

        }
    });


    final Boolean[] boollatestnewssaving = {false};
    ICONHotViewPagerSaving.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            if (boollatestnewssaving[0] == true){
                Toast.makeText(v.getContext(), "Turn Off Saved News ", Toast.LENGTH_SHORT).show();
                ICONHotViewPagerSaving.setImageResource(R.drawable.saved_off);
                boollatestnewssaving[0] = false;
                /*updateSavedNewsSaving("update_newssaving", id, false);*/
            } else if(boollatestnewssaving[0] == false) {
                Toast.makeText(v.getContext(), "Turn On Saved News ", Toast.LENGTH_SHORT).show();
                ICONHotViewPagerSaving.setImageResource(R.drawable.saved_on);
                boollatestnewssaving[0] = true;
                /*updateSavedNewsSaving("update_newssaving", id, true);*/
            }
        }
    });

    ViewPager vp = (ViewPager) container;
    vp.addView(vi, 0);
    return vi;

}



@Override
public void destroyItem(ViewGroup container, int position, Object object) {

    ViewPager vp = (ViewPager) container;
    View view = (View) object;
    vp.removeView(view);

}

}

使用 GetHighlight 函数会发生什么情况，它只会显示第三张图像，第一张和第二张图像是空白的我不知道如何让它像这样工作

String test[]=new String[]{urlImageSend>>Image1, urlImageSend>Image2, urlImageSend>>Image3}

点击使用3次

Answer 1

声明一个 ArrayList，它将在您的 Activity 类中保存图像 URL，如下所示

ArrayList<String> list = new ArrayList<>();

现在定义一个函数，它将在 ArrayList 中插入图像 URL

list.add(imageURL);

现在创建您的 viewpager 适配器并设置适配器

adapterViewPagerHot = new AdapterViewPagerHot(getActivity(), list);

确保在 AdapterViewPagerHot 类中将字符串更改为 arraylist