我需要制作一个电子商务应用程序类型的屏幕，其中包含多个视图寻呼机和回收器视图。
我实现了它，但我的二分之一视图寻呼机在回收器视图中可见，一旦我旋转设备，我的第一个视图寻呼机也会消失。
我的活动：
public class MainActivity extends AppCompatActivity {
private List<ProductEntity> productEntities = new ArrayList<>();
private RecyclerView productlist;
private HomeAdapter homeAdapter;
private RecyclerView.LayoutManager mLayoutManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
productlist = (RecyclerView)findViewById(R.id.mainlist);
//productlist.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
productlist.setLayoutManager(mLayoutManager);
homeAdapter = new HomeAdapter(this,getSupportFragmentManager(),productEntities);
productlist.setAdapter(homeAdapter);
new ParserJsonTask().execute();
}
public String loadJSONFromAsset() {
StringBuffer sb = new StringBuffer();
BufferedReader br = null;
try {
br = new BufferedReader(new InputStreamReader(getAssets().open(
"f_two.json")));
String temp;
while ((temp = br.readLine()) != null)
sb.append(temp);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
br.close(); // stop reading
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
private class ParserJsonTask extends AsyncTask<Void, Integer, List<ProductEntity>> {
@Override
protected List<ProductEntity> doInBackground(Void... params) {
try{
return JsonParser.getInstance().parseJson(loadJSONFromAsset());
}catch(Exception e){
Log.d("Exception", e.toString());
}
return null;
}
@Override
protected void onPostExecute(List<ProductEntity> result) {
Log.e("Length",""+result.size());
if(result != null) {
productEntities = result;
homeAdapter.setProduct(productEntities);
}
}
}
我的视图寻呼机片段：
public class ImageFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_IMAGE_URL = "image_url";
private Context context;
private String image_url;
public ImageFragment() {
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
this.context = context;
}
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static ImageFragment newInstance(String image) {
ImageFragment fragment = new ImageFragment();
Bundle args = new Bundle();
args.putString(ARG_IMAGE_URL, image);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
image_url = getArguments().getString(ARG_IMAGE_URL);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_image, container, false);
ImageView image = (ImageView) rootView.findViewById(R.id.image);
Log.e("Pager Item Image",""+image_url);
if(!TextUtils.isEmpty(image_url))
Picasso.with(context).load(image_url).into(image);
return rootView;
}
}
我的主适配器用于回收器视图：
public class HomeAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private List<ProductEntity> productEntities;
private Context context;
private FragmentManager fragmentManager;
private OnItemClickListener mItemClickListener;
private static final int TYPE_FIRST = 0;
private static final int TYPE_SECOND = 1;
private static final int TYPE_THIRD = 2;
private static final String TEMPLATE_FIRST ="product-template-1";
private static final String TEMPLATE_SECOND ="product-template-2";
private static final String TEMPLATE_THIRD ="product-template-3";
public HomeAdapter(Context context , FragmentManager fragmentManager ,List<ProductEntity> productEntities) {
this.productEntities = productEntities;
this.context = context;
this.fragmentManager = fragmentManager;
}
@Override
public int getItemCount() {
Log.e("Item count",""+productEntities.size());
return productEntities.size();
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if(holder instanceof ImageViewHolder) {
ImageViewHolder imageViewHolder = (ImageViewHolder) holder;
ProductEntity productEntity = productEntities.get(position);
Log.e("Template Item Image",""+productEntity.getItemEntities().get(0).getImage());
Picasso.with(context).load(productEntity.getItemEntities().get(0).getImage()).into(imageViewHolder.imageView);
} else if(holder instanceof PagerViewHolder) {
PagerViewHolder pagerViewHolder = (PagerViewHolder) holder;
ProductEntity productEntity = productEntities.get(position);
pagerViewHolder.viewPager.setAdapter(new PagerAdapter(fragmentManager,productEntity.getItemEntities()));
} else if (holder instanceof HorizontalViewHolder) {
HorizontalViewHolder horizontalViewHolder = (HorizontalViewHolder) holder;
ProductEntity productEntity = productEntities.get(position);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(context);
linearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
horizontalViewHolder.recyclerView.setLayoutManager(linearLayoutManager);
horizontalViewHolder.recyclerView.setAdapter(new SliderAdapter(context,productEntity.getItemEntities()));
}
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder (ViewGroup parent, int viewType) {
if(viewType == TYPE_FIRST) {
View v = LayoutInflater.from (parent.getContext ()).inflate (R.layout.content_image, parent, false);
return new ImageViewHolder (v);
} else if(viewType == TYPE_SECOND) {
View v = LayoutInflater.from (parent.getContext ()).inflate (R.layout.content_horizontal, parent, false);
return new HorizontalViewHolder (v);
} else {
View v = LayoutInflater.from (parent.getContext ()).inflate (R.layout.content_pager, parent, false);
return new PagerViewHolder(v);
}
}
@Override
public int getItemViewType (int position) {
if(productEntities.get(position).getTemplate().equalsIgnoreCase(TEMPLATE_FIRST)) {
Log.e("Item type",""+TYPE_FIRST);
return TYPE_FIRST;
} else if(productEntities.get(position).getTemplate().equalsIgnoreCase(TEMPLATE_SECOND)) {
Log.e("Item type",""+TYPE_SECOND);
return TYPE_SECOND;
} else {
Log.e("Item type",""+TYPE_THIRD);
return TYPE_THIRD;
}
}
class PagerViewHolder extends RecyclerView.ViewHolder {
protected ViewPager viewPager;
public PagerViewHolder (View itemView) {
super (itemView);
this.viewPager = (ViewPager) itemView.findViewById (R.id.viewpager);
}
}
class ImageViewHolder extends RecyclerView.ViewHolder {
protected ImageView imageView;
public ImageViewHolder (View itemView) {
super (itemView);
this.imageView = (ImageView) itemView.findViewById (R.id.image);
}
}
public class HorizontalViewHolder extends RecyclerView.ViewHolder {
protected RecyclerView recyclerView;
public HorizontalViewHolder(View v) {
super(v);
recyclerView = (RecyclerView)v.findViewById(R.id.horizontallist);
}
}
public void setProduct(List<ProductEntity> data) {
productEntities.clear();
productEntities.addAll(data);
notifyDataSetChanged();
}
public interface OnItemClickListener {
void onItemClick(View view, int position);
}
public void SetOnItemClickListener(final OnItemClickListener mItemClickListener) {
this.mItemClickListener = mItemClickListener;
}
}
我的视图寻呼机适配器：
public class PagerAdapter extends FragmentPagerAdapter {
private List<ItemEntity> itemEntities;
public PagerAdapter(FragmentManager fm, List<ItemEntity> itemEntities) {
super(fm);
this.itemEntities = itemEntities;
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
return ImageFragment.newInstance(itemEntities.get(position).getImage());
}
@Override
public int getCount() {
// Show 3 total pages.
return itemEntities.size();
}
}
我的水平回收视图适配器：
public class SliderAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private List<ItemEntity> itemEntities;
private Context context;
private OnItemClickListener mItemClickListener;
public SliderAdapter(Context context , List<ItemEntity> notesEntities) {
this.itemEntities = notesEntities;
this.context = context;
}
@Override
public int getItemCount() {
return itemEntities.size();
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
ItemViewHolder itemViewHolder = (ItemViewHolder) holder;
ItemEntity itemEntity = itemEntities.get(position);
itemViewHolder.productName.setText(itemEntity.getLabel());
Log.e("Item Image",""+itemEntity.getImage());
if(!TextUtils.isEmpty(itemEntity.getImage()))
Picasso.with(context).load(itemEntity.getImage()).into(itemViewHolder.productImage);
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder (ViewGroup parent, int viewType) {
View v = LayoutInflater.from (parent.getContext ()).inflate (R.layout.recycler_card_layout, parent, false);
return new ItemViewHolder (v);
}
public class ItemViewHolder extends RecyclerView.ViewHolder {
protected TextView productName;
protected ImageView productImage;
public ItemViewHolder(View v) {
super(v);
productName = (TextView) v.findViewById(R.id.product_name);
productImage = (ImageView) v.findViewById(R.id.product_image);
v.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mItemClickListener != null)
mItemClickListener.onItemClick(v, getAdapterPosition());
}
});
}
}
public void setItems(List<ItemEntity> data) {
itemEntities.clear();
itemEntities.addAll(data);
notifyDataSetChanged();
}
public interface OnItemClickListener {
void onItemClick(View view, int position);
}
public void SetOnItemClickListener(final OnItemClickListener mItemClickListener) {
this.mItemClickListener = mItemClickListener;
}
}
主要活动布局：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".activity.MainActivity"
tools:showIn="@layout/activity_main">
<android.support.v7.widget.RecyclerView
android:id="@+id/mainlist"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>
</RelativeLayout>
水平滚动布局：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".activity.MainActivity"
tools:showIn="@layout/activity_main">
<android.support.v7.widget.RecyclerView
android:id="@+id/horizontallist"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</android.support.v7.widget.RecyclerView>
</RelativeLayout>
查看寻呼机布局：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="200dp">
</android.support.v4.view.ViewPager>
</RelativeLayout>
根据我的JSON数据，它在回收器视图中应该有2个视图寻呼机，但在纵向模式下只显示1个，一旦我旋转设备，两者都会消失。我认为数据在回收器视图中是不可见的，因为我可以在滚动时看到回收器视图的空白。
如有任何帮助，我们将不胜感激。
简单更改：
extends FragmentPagerAdapter
至
extends FragmentStatePagerAdapter