如何使用viewpager设置壁纸

如何解决如何使用viewpager设置壁纸

当我尝试设置壁纸时，设置了下一张图片，但未设置当前位置。 如何解决这个问题

这是主要代码。当我点击按钮（设置壁纸）并从图像中获取图像预览时。

在图像设置之前，进度也没有出现。

MyViewPagerAdapter myViewPagerAdapter;
myViewPagerAdapter = new MyViewPagerAdapter();
    viewPager.setAdapter(myViewPagerAdapter);
     set_as_wal.setonClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            progressDialog = ProgressDialog.show(getActivity(),"Please wait...","Set as your wallpaper...",false,true);

            WallpaperManager wallpaperManager = WallpaperManager.getInstance(getActivity());

            Bitmap bitmap = ((BitmapDrawable) myViewPagerAdapter.imageViewPreview.getDrawable() ).getBitmap();

            try {
                if (bitmap != null) {
                    wallpaperManager.setBitmap(bitmap);
                    Snackbar.make(relative_image_slider,"Wallpaper was set",Snackbar.LENGTH_SHORT).show();
                    progressDialog.dismiss();
                   
                }else {
                    Toast.makeText(getActivity(),"Unable to set your wallpaper !!",Toast.LENGTH_LONG).show();
                }


            } catch (IOException e) {
                Toast.makeText(getActivity(),"Something went wrong !!",Toast.LENGTH_LONG).show();
                e.printstacktrace();
            }

这是我的 ViewPage 适配器

    public class MyViewPagerAdapter extends PagerAdapter {

    private LayoutInflater layoutInflater;
    ImageView imageViewPreview;
    public MyViewPagerAdapter() {
    }

    @NonNull
    @Override
    public Object instantiateItem(@NonNull ViewGroup container,int position) {

        if(getActivity() != null){
            layoutInflater = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }

        View view = layoutInflater.inflate(R.layout.image_fullscreen_preview,container,false);

        imageViewPreview = view.findViewById(R.id.image_preview);

        Image image = images.get(position);

        //  displayInterstitial();

        Glide.with(getActivity()).load(image.getLarge())
                .thumbnail(0.5f)
                .into(imageViewPreview);

        container.addView(view);

        return view;
    }

    @Override
    public int getCount() {
        return images.size();
    }

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


    @Override
    public void destroyItem(@NonNull ViewGroup container,int position,@NonNull Object object) {
        container.removeView((View) object);
    }
}