ViewPager and ImageGallery

Question

问题是：

当你第一次选择图片时，一切都很好。如果您滑动并按"；背面"；按钮，打开另一个图像后，将打开最后一个将打开的图像。

正确的位置通过束。我不知道从哪里查找错误。

public class ViewPagerAdapter extends PagerAdapter {
private LayoutInflater layoutInflater;
public ViewPagerAdapter() {
}
@NonNull
@Override
public Object instantiateItem(@NonNull ViewGroup container, int position) {
layoutInflater = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = layoutInflater.inflate(R.layout.image_fullscreen, container, false);
ImageView imageView = view.findViewById(R.id.image_fScreen);
Hit hit = hits.get(position);
Picasso.get().load(hit.getLargeImageURL())
.into(imageView);
container.addView(view);
return view;
}
@Override
public int getCount() {
return hits.size();
}
@Override
public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
return view == object;
}
@Override
public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
container.removeView((View) object);
}
}

对话框片段：

public class FullScreenDialogFragment extends DialogFragment {
private ArrayList<Hit> hits;
private ViewPager viewPager;
private ViewPagerAdapter viewPagerAdapter;
private TextView author;
private TextView count;
private int selectedPosition;
private Button buttonShare;
private static FullScreenDialogFragment fullScreenDialogFragment;
private int rlyPosition;
public static FullScreenDialogFragment getInstance() {
if (fullScreenDialogFragment == null) {
fullScreenDialogFragment = new FullScreenDialogFragment();
}
return fullScreenDialogFragment;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setStyle(DialogFragment.STYLE_NO_FRAME, R.style.DialogStyle);
}
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.image_viewpager, container, false);
viewPager = view.findViewById(R.id.viewpager);
author = view.findViewById(R.id.author);
buttonShare = view.findViewById(R.id.btnShare);
count = view.findViewById(R.id.count);
hits = (ArrayList<Hit>) getArguments().getSerializable("hits");
selectedPosition = getArguments().getInt("position");
viewPagerAdapter = new ViewPagerAdapter();
viewPager.setAdapter(viewPagerAdapter);
viewPager.addOnPageChangeListener(onViewPageChangeListener);

setItem(selectedPosition);
return view;
}
private void setItem(int pos) {
viewPager.setCurrentItem(pos, true);
setItemInfo(selectedPosition);
}
private void setItemInfo(int pos) {
count.setText((pos + 1) + " of " + hits.size());
Hit hit = hits.get(pos);
author.setText(hit.getUser());

}

ViewPager.OnPageChangeListener onViewPageChangeListener = new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

}
@Override
public void onPageSelected(int position) {
setItemInfo(position);

}
@Override
public void onPageScrollStateChanged(int state) {
}
};

Answer 1

我想问题就在这里

private void setItem(int pos) {
viewPager.setCurrentItem(pos, true);
setItemInfo(selectedPosition);
}

您可能正在传递selectedPosition而不是currentPosition

请检查。

Answer 2

我的问题是创建DialogFramgent对象。我用Singlton模式给他做了这个，并用旧数据称之为。

现在在OnClick中，我创建了新的对象DialogFramget，他得到了新的值。

FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fullScreenDialog = new FullScreenDialogFragment();
fullScreenDialog.setArguments(bundle);
fullScreenDialog.show(fragmentTransaction, "");