viewpager + picasso + photoview issue

Question

当使用viewpager与picasso库和photoview库时，我遇到了2个问题。

1）某些图像不缩放，有时下一张图像会缩放。

2）有时当我放大图像时，相邻图像也会随当前缩放。

如何解决上述2个问题？

public class ImageViewerPagerAdapter extends PagerAdapter implements PhotoViewAttacher.OnViewTapListener { 


Context context; 
private int count; 
private ArrayList<String> images; 
private PhotoViewAttacher mAttacher; 
private boolean shouldFit = false; 


public ImageViewerPagerAdapter(Context context, int count, ArrayList<String> images, boolean shouldFit) { 
    this.context = context; 
    this.count = count; 
    this.images = new ArrayList<>(images); 
    this.shouldFit = shouldFit; 

} 


@Override 
public int getCount() { 
    return count; 
} 

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


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


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

    String imageUrl = images.get(position); 
    LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    View view = inflater.inflate(R.layout.activity_image_viewpager_layout, container, false); 
    final PhotoView imageView = (PhotoView) view.findViewById(R.id.image); 
    if (shouldFit) { 
     Picasso.with(context).load(imageUrl).into(imageView, new Callback() { 
      @Override 
      public void onSuccess() { 

       if (mAttacher != null) { 
        mAttacher.update(); 
       } else { 
        mAttacher = new PhotoViewAttacher(imageView); 
        mAttacher.setOnViewTapListener(ImageViewerPagerAdapter.this); 
       } 

      } 

      @Override 
      public void onError() { 

      } 
     }); 
    } else { 
     Picasso.with(context).load(imageUrl).into(imageView, new Callback() { 
      @Override 
      public void onSuccess() { 
       if (mAttacher != null) { 
        mAttacher.update(); 
       } else { 
        mAttacher = new PhotoViewAttacher(imageView); 
        mAttacher.setOnViewTapListener(ImageViewerPagerAdapter.this); 
       } 
      } 

      @Override 
      public void onError() { 

      } 
     }); 
    } 

    container.addView(view); 


    return view; 
} 


@Override 
public void onViewTap(View view, float v, float v1) { 
    Toaster.make(context,"hello"); 
    ((ImageViewPagerActivity) context).animateToolbar(); 
} 


} 

Answer 1

Android OS出现问题。当操作系统绘制视图时，它会将其缓存在系统中，当系统请求相同的视图时，操作系统将不会绘制新视图，而是从缓存中检索已经绘制的视图。这就是为什么您可能会遇到诸如显示在视图中的下一图像等问题。你也可以在列表中看到这样的问题