Question

我使用FirebaseDatabase创建在线测验应用程序。当我在模拟器中启动应用程序（Genymotion：Samsung Galaxy S5 4.4.4）时，可以从我的类别模型中加载图像，但是当我在手机（华为P7-L10 4.4.2和其他手机）中启动应用程序时，我无法加载我的类别模型中的图片。在我的手机中未显示图像。

在我的Logcat中，当我在手机中启动应用程序时显示此内容

“”“ W / ClassMapper：在类Model.Category上找不到图像的设置器/字段”“

enter image description here

//我的Category.class模型

public class Category {

private String Name;
private String Image;

public Category(){
}

public Category(String name, String image){
    this.Name = name;
    this.Image = image;
}

public String getName() {
    return Name;
}

public void setName(String name) {
    this.Name = name;
}

public String getImage() {
    return Image;
}

public void setImage(String image) {
    this.Image = image;
}}

//我的CategoryFragment.class

public class CategoryFragment extends Fragment {
View myFragment;
RecyclerView listCategory;
RecyclerView.LayoutManager layoutManager;
FirebaseRecyclerAdapter<Category,CategoryViewHolder> adapter;

FirebaseDatabase database;
DatabaseReference categories;

public static CategoryFragment newInstance(){
    CategoryFragment categoryFragment = new CategoryFragment();
    return categoryFragment;
}

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    database = FirebaseDatabase.getInstance();
    categories = database.getReference("Category");

}

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable 
ViewGroup container, @Nullable Bundle savedInstanceState) {
    myFragment = 
inflater.inflate(R.layout.fragment_category,container,false);

    listCategory = myFragment.findViewById(R.id.listCategory);
    listCategory.setHasFixedSize(true);
    layoutManager = new LinearLayoutManager(container.getContext());
    listCategory.setLayoutManager(layoutManager);

    loadCategories();

    return myFragment;
}

public void loadCategories(){
    adapter = new FirebaseRecyclerAdapter<Category, CategoryViewHolder>(
            Category.class,
            R.layout.category_layout,
            CategoryViewHolder.class,
            categories
    ) {
        @Override
        protected void populateViewHolder(CategoryViewHolder viewHolder, f 
 final Category model, int position) {
            viewHolder.category_name.setText(model.getName());
            Picasso.with(getActivity())
                    .load(model.getImage())
                    .into(viewHolder.category_image);

            viewHolder.setItemClickListener(new ItemClickListener() {
                @Override
                public void onClick(View view, int position, boolean isLongClick) {
                    Toast.makeText(getActivity(),String.format("%s|%s",adapter.getRef(position).getKey(),model.getName()),Toast.LENGTH_SHORT).show();
                }
            });
        }
    };
    adapter.notifyDataSetChanged();
    listCategory.setAdapter(adapter);
}}

// CategoryViewHolder.class

public class CategoryViewHolder extends RecyclerView.ViewHolder implements 
View.OnClickListener {

public TextView category_name;
public ImageView category_image;

private ItemClickListener itemClickListener;

public CategoryViewHolder(@NonNull View itemView) {
    super(itemView);
    category_image = itemView.findViewById(R.id.category_image);
    category_name = itemView.findViewById(R.id.category_name);

    itemView.setOnClickListener(this);
}

public void setItemClickListener(ItemClickListener itemClickListener){
    this.itemClickListener = itemClickListener;
}

@Override
public void onClick(View view) {
    itemClickListener.onClick(view,getAdapterPosition(),false);
}}

//我的ItemClickListener

public interface ItemClickListener {
void onClick(View view, int position, boolean isLongClick);}

//我的category_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="300dp">

<ImageView
    android:id="@+id/category_image"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:scaleType="centerCrop"/>

<TextView
    android:id="@+id/category_name"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:text="Category Name"
    android:textColor="@android:color/white"
    android:textSize="24sp"
    android:gravity="center"
    android:background="#4f0e0d0e"/>

//我的fragment_category.xml

  <?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".CategoryFragment"
android:background="@color/colorPrimary">

<android.support.v7.widget.RecyclerView
    android:id="@+id/listCategory"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>

</FrameLayout>

W / ClassMapper：Android Studio中没有课程的设置器/字段

0 个答案: