目前,我有以下实现：
列表适配器：
@OverrIDepublic voID onBindVIEwHolder(MyHolder holder,int position) { super.onBindVIEwHolder(holder,position); Item ListItem = get(position); ... galleryAdapter adapter = new galleryAdapter(getActivity().getSupportFragmentManager(),item.mediagallery); holder.imagegallery.setAdapter(adapter); ...} 图库适配器：
public class galleryAdapter extends FragmentStatePagerAdapter { private final List<Item.gallery> mItems; @Bind(R.ID.gallery_item) ImageVIEw galleryVIEw; public SearchResultsgalleryPagerAdapter(FragmentManager fm,@NonNull ArrayList<Item.gallery> mediagallery) { super(fm); mItems = mediagallery; } @OverrIDe public Fragment getItem(int position) { galleryFragment fragment = galleryFragment.newInstance(mItems.get(position)); ... return fragment; } @OverrIDe public int getCount() { return null == mItems ? 0 : mItems.size(); } @OverrIDe public int getItemposition(Object object) { //return super.getItemposition(object); return PagerAdapter.position_NONE; }} 图库片段：
public class galleryFragment extends Fragment { private static final String galLERY_ITEM_BUNDLE_KEY = "gallery_item_bundle_key"; @Bind(R.ID.gallery_item) ImageVIEw mgalleryVIEw; private Item.gallery mgalleryItem; // Empty constructor,required as per Fragment docs public galleryFragment() {} public static SearchResultsgalleryFragment newInstance(Item.gallery galleryItem) { galleryFragment fragment = new galleryFragment(); // Add the item in the bundle which will be set to the fragment Bundle bundle = new Bundle(); bundle.putSerializable(galLERY_ITEM_BUNDLE_KEY,galleryItem); fragment.setArguments(bundle); return fragment; } @OverrIDe public voID onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); mgalleryItem = (Item.gallery) getArguments().getSerializable(galLERY_ITEM_BUNDLE_KEY); } @Nullable @OverrIDe public VIEw onCreateVIEw(LayoutInflater inflater,@Nullable VIEwGroup container,@Nullable Bundle savedInstanceState) { VIEw vIEw = inflater.inflate(R.layout.fragment_gallery_item,container,false); ButterKnife.bind(this,vIEw); displaygalleryItem(); return vIEw; } private voID displaygalleryItem() { if (null != mgalleryItem) { GlIDe.with(getContext()) // Bind it with the context of the actual vIEw used .load(mgalleryItem.getimageUrl()) // Load the image .centerCrop() // scale type .placeholder(R.drawable.default_product_400_land) // temporary holder displayed while the image loads .crossFade() .into(mgalleryVIEw); } }} 我遇到的问题是VIEwPager的片段没有正确创建和显示.有时它们出现在手动滚动之后(但并非总是如此),在大多数情况下它们根本不出现.
有没有人对我实施的错误有所了解？
解决方法 我已经设法通过直接使用PagerAdapter解决了这个问题.import androID.content.Context;import androID.support.annotation.NonNull;import androID.support.v4.vIEw.PagerAdapter;import androID.util.Log;import androID.vIEw.LayoutInflater;import androID.vIEw.VIEw;import androID.vIEw.VIEwGroup;import androID.Widget.ImageVIEw;import com.bumptech.glIDe.GlIDe;import com.bumptech.glIDe.load.DecodeFormat;import com.peoplepost.androID.R;import com.peoplepost.androID.common.Listener.ItemClickSupport;import com.peoplepost.androID.network.merv.model.Product;import java.util.ArrayList;import java.util.List;/** * <p> * Custom pager adapter which will manually create the pages needed for showing an slIDe pages gallery. * </p> * Created by Ionut Negru on 13/06/16. */public class galleryAdapter extends PagerAdapter { private static final String TAG = "galleryAdapter"; private final List<Item> mItems; private final LayoutInflater mLayoutInflater; /** * The click event Listener which will propagate click events to the parent or any other Listener set */ private ItemClickSupport.SimpleOnItemClickListener mOnItemClickListener; /** * Constructor for gallery adapter which will create and screen slIDe of images. * * @param context * The context which will be used to inflate the layout for each page. * @param mediagallery * The List of items which need to be displayed as screen slIDe. */ public galleryAdapter(@NonNull Context context,@NonNull ArrayList<Item> mediagallery) { super(); // Inflater which will be used for creating all the necessary pages mLayoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); // The items which will be displayed. mItems = mediagallery; } @OverrIDe public int getCount() { // Just to be safe,check also if we have an valID List of items - never return invalID size. return null == mItems ? 0 : mItems.size(); } @OverrIDe public boolean isVIEwFromObject(VIEw vIEw,Object object) { // The object returned by instantiateItem() is a key/IDentifIEr. This method checks whether // the VIEw passed to it (representing the page) is associated with that key or not. // It is required by a PagerAdapter to function properly. return vIEw == object; } @OverrIDe public Object instantiateItem(VIEwGroup container,final int position) { // This method should create the page for the given position passed to it as an argument. // In our case,we inflate() our layout resource to create the hIErarchy of vIEw objects and then // set resource for the ImageVIEw in it. // Finally,the inflated vIEw is added to the container (which should be the VIEwPager) and return it as well. // inflate our layout resource VIEw itemVIEw = mLayoutInflater.inflate(R.layout.fragment_gallery_item,false); // display the resource on the vIEw displaygalleryItem((ImageVIEw) itemVIEw.findVIEwByID(R.ID.gallery_item),mItems.get(position)); // Add our inflated vIEw to the container container.addVIEw(itemVIEw); // Detect the click events and pass them to any Listeners itemVIEw.setonClickListener(new VIEw.OnClickListener() { @OverrIDe public voID onClick(VIEw v) { if (null != mOnItemClickListener) { mOnItemClickListener.onItemClicked(position); } } }); // Return our vIEw return itemVIEw; } @OverrIDe public voID destroyItem(VIEwGroup container,int position,Object object) { // Removes the page from the container for the given position. We simply removed object using removeVIEw() // but Could’ve also used removeVIEwAt() by passing it the position. try { // Remove the vIEw from the container container.removeVIEw((VIEw) object); // Try to clear resources used for displaying this vIEw GlIDe.clear(((VIEw) object).findVIEwByID(R.ID.gallery_item)); // Remove any resources used by this vIEw unbindDrawables((VIEw) object); // InvalIDate the object object = null; } catch (Exception e) { Log.w(TAG,"destroyItem: Failed to destroy item and clear it's used resources",e); } } /** * Recursively unbind any resources from the provIDed vIEw. This method will clear the resources of all the * children of the vIEw before invalIDating the provIDed vIEw itself. * * @param vIEw * The vIEw for which to unbind resource. */ protected voID unbindDrawables(VIEw vIEw) { if (vIEw.getBackground() != null) { vIEw.getBackground().setCallback(null); } if (vIEw instanceof VIEwGroup) { for (int i = 0; i < ((VIEwGroup) vIEw).getChildCount(); i++) { unbindDrawables(((VIEwGroup) vIEw).getChildAt(i)); } ((VIEwGroup) vIEw).removeAllVIEws(); } } /** * Set an Listener which will notify of any click events that are detected on the pages of the vIEw pager. * * @param onItemClickListener * The Listener. If {@code null} it will disable any events from being sent. */ public voID setonItemClickListener(ItemClickSupport.SimpleOnItemClickListener onItemClickListener) { mOnItemClickListener = onItemClickListener; } /** * display the gallery image into the image vIEw provIDed. * * @param galleryVIEw * The vIEw which will display the image. * @param galleryItem * The item from which to get the image. */ private voID displaygalleryItem(ImageVIEw galleryVIEw,Item galleryItem) { if (null != galleryItem) { GlIDe.with(galleryVIEw.getContext()) // Bind it with the context of the actual vIEw used .load(galleryItem.getimageUrl()) // Load the image .asBitmap() // All our images are static,we want to display them as bitmaps .format(DecodeFormat.PREFER_RGB_565) // the decode format - this will not use Alpha at all .centerCrop() // scale type .placeholder(R.drawable.default_product_400_land) // temporary holder displayed while the image loads .animate(R.anim.fade_in) // need to manually set the animation as bitmap cannot use cross fade .thumbnail(0.2f) // make use of the thumbnail which can display a down-sized version of the image .into(galleryVIEw); // Voilla - the target vIEw } }} 并且更新了父RecyclerVIEw的onBindVIEwHolder()：
@OverrIDepublic voID onBindVIEwHolder(MyHolder holder,position); Item ListItem = get(position); ... galleryAdapter adapter = new galleryAdapter(getActivity(),product.mediagallery); // Set the custom click Listener on the adapter directly adapter.setonItemClickListener(new ItemClickSupport.SimpleOnItemClickListener() { @OverrIDe public voID onItemClicked(int position) { // inner vIEw pager page was clicked } }); // Set the adapter on the vIEw pager holder.imagegallery.setAdapter(adapter); ...} 我注意到内存使用量略有增加,但UI非常流畅.我想可以进一步优化保存多少页面以及如何销毁和恢复它们.
我希望这能帮助处于类似情况的其他人.
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