recyclerview 未在片段中显示数据

Question

我正在尝试从 firebase 获取一些数据并将其显示在片段的回收站视图中所以我确实创建了一个方法来做到这一点：

private void getModules(View view)
{


    CollectionReference ref = db.collection(level).document(major).collection("Modules");
    ref.get().addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
        @Override
        public void onSuccess(QuerySnapshot queryDocumentSnapshots)
        {

            for (DocumentSnapshot documentSnapshot:queryDocumentSnapshots.getDocuments()) {
                Module module = documentSnapshot.toObject(Module.class);
                modulesList.add(module);

            }
            ModulesAdapter adapter = new ModulesAdapter(modulesList);
            modulesRecyclerView.setHasFixedSize(true);
            modulesRecyclerView.setLayoutManager(new LinearLayoutManager(view.getContext()));
            modulesRecyclerView.setAdapter(adapter);

        }
    });
}

数据检索成功，它在数组列表中，但它认为问题出在这些代码行中：

ModulesAdapter adapter = new ModulesAdapter(modulesList);
            modulesRecyclerView.setHasFixedSize(true);
            modulesRecyclerView.setLayoutManager(new LinearLayoutManager(view.getContext()));
            modulesRecyclerView.setAdapter(adapter);

模块 class 是：

public class Module {
    private String name;
    private String responsable;
    int coefficient;
    Uri imageUri;
    String imageUrl;


    

    public Module() {
    }

    public Module(String name, String responsable, int coefficient , Uri image) {
        this.name = name;
        this.responsable = responsable;
        this.imageUri = image;
        this.coefficient = coefficient;
    }

    public Module(String name, String responsable, int coefficient) {
        this.name = name;
        this.responsable = responsable;
        this.coefficient = coefficient;
        this.imageUri= Uri.parse("android.resource://com.aymenmellah.edisco/" + R.drawable.ali);
    }

    public String getName() {
        return name;
    }

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

    public String getResponsable() {
        return responsable;
    }

    public void setResponsable(String responsable) {
        this.responsable = responsable;
    }

    public int getCoefficient() {
        return coefficient;
    }

    public void setCoefficient(int coefficient) {
        this.coefficient = coefficient;
    }

    @Exclude
    public Uri getImageUri() {
        return imageUri;
    }

    public void setImageUri(Uri imageUri) {
        this.imageUri = imageUri;
    }


    public String getImageUrl() {
        return imageUrl;
    }

    public void setImageUrl(String imageUrl) {
        this.imageUrl = imageUrl;
    }
}

回收器视图适配器是：

 private List<Module> modulesArrayList;

public ModulesAdapter(List<Module> modulesArrayList) {
    this.modulesArrayList = modulesArrayList;
}

@NonNull
@Override
public ModulesViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    return new ModulesViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.module_item,parent,false));
}

@Override
public void onBindViewHolder(@NonNull ModulesViewHolder holder, int position) {

    Module module = modulesArrayList.get(position);
    holder.moduleName.setText(module.getName());
    holder.moduleResponsable.setText(module.getResponsable());
    holder.moduleCoefficient.setText(module.getCoefficient());
    //ADD HERE IMAGE

}

@Override
public int getItemCount() {
    return modulesArrayList.size();
}

public class ModulesViewHolder extends RecyclerView.ViewHolder {

    TextView moduleName,moduleResponsable,moduleCoefficient,moduleImage;

    public ModulesViewHolder(@NonNull View itemView) {
        super(itemView);
        moduleName = itemView.findViewById(R.id.module_name);
        moduleResponsable = itemView.findViewById(R.id.responsable_name);
        moduleCoefficient = itemView.findViewById(R.id.coefficient_module_item);
        //moduleImage = itemView.findViewById(R.id.module_image_item);
    }
}

}`

这是 onCreateView 方法：

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_modules, container, false);
        modulesList = new ArrayList<>();

        db=FirebaseFirestore.getInstance();
        modulesRecyclerView = view.findViewById(R.id.modules_recyclerview);
        getModules(view);
                return view;
    }

当上面的代码执行时，应用程序崩溃并且 return 到之前的 activity 我得到这个错误：

    android.content.res.Resources$NotFoundException: String resource ID #0x2
        at android.content.res.Resources.getText(Resources.java:375)
        at android.widget.TextView.setText(TextView.java:6411)
        at com.aymenmellah.edisco.Controller.ModulesAdapter.onBindViewHolder(ModulesAdapter.java:38)
        at com.aymenmellah.edisco.Controller.ModulesAdapter.onBindViewHolder(ModulesAdapter.java:18)
        at androidx.recyclerview.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:7065)
        at androidx.recyclerview.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:7107)
        at androidx.recyclerview.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:6012)
        at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6279)
        at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6118)
        at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6114)
        at androidx.recyclerview.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2303)
        at androidx.recyclerview.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1627)
        at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1587)
        at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:665)
        at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:4134)
        at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:3851)
        at androidx.recyclerview.widget.RecyclerView.onLayout(RecyclerView.java:4404)
        at android.view.View.layout(View.java:22344)
        at android.view.ViewGroup.layout(ViewGroup.java:6445)
        at androidx.constraintlayout.widget.ConstraintLayout.onLayout(ConstraintLayout.java:1873)
        at android.view.View.layout(View.java:22344)
        at android.view.ViewGroup.layout(ViewGroup.java:6445)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
        at android.view.View.layout(View.java:22344)
        at android.view.ViewGroup.layout(ViewGroup.java:6445)
        at androidx.recyclerview.widget.RecyclerView$LayoutManager.layoutDecoratedWithMargins(RecyclerView.java:9587)
        at androidx.recyclerview.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1685)
        at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1587)
        at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:665)
        at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:4134)
        at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:3851)
        at androidx.recyclerview.widget.RecyclerView.onLayout(RecyclerView.java:4404)
        at android.view.View.layout(View.java:22344)
        at android.view.ViewGroup.layout(ViewGroup.java:6445)
        at androidx.viewpager2.widget.ViewPager2.onLayout(ViewPager2.java:527)
        at android.view.View.layout(View.java:22344)
        at android.view.ViewGroup.layout(ViewGroup.java:6445)
        at androidx.constraintlayout.widget.ConstraintLayout.onLayout(ConstraintLayout.java:1873)
        at android.view.View.layout(View.java:22344)
        at android.view.ViewGroup.layout(ViewGroup.java:6445)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
        at android.view.View.layout(View.java:22344)
        at android.view.ViewGroup.layout(ViewGroup.java:6445)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1845)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1673)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1582)
        at android.view.View.layout(View.java:22344)
        at android.view.ViewGroup.layout(ViewGroup.java:6445)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
2022-04-23 17:46:14.854 26120-26120/com.aymenmellah.edisco E/AndroidRuntime:     at android.view.View.layout(View.java:22344)
        at android.view.ViewGroup.layout(ViewGroup.java:6445)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1845)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1673)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1582)
        at android.view.View.layout(View.java:22344)
        at android.view.ViewGroup.layout(ViewGroup.java:6445)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
        at com.android.internal.policy.DecorView.onLayout(DecorView.java:842)
        at android.view.View.layout(View.java:22344)
        at android.view.ViewGroup.layout(ViewGroup.java:6445)
        at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:3565)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2988)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:2051)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:8456)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1065)
        at android.view.Choreographer.doCallbacks(Choreographer.java:889)
        at android.view.Choreographer.doFrame(Choreographer.java:816)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1050)
        at android.os.Handler.handleCallback(Handler.java:883)
        at android.os.Handler.dispatchMessage(Handler.java:100)
        at android.os.Looper.loop(Looper.java:237)
        at android.app.ActivityThread.main(ActivityThread.java:7830)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1040)

Answer 1

问题

您没有按照在文本视图中设置文本的方法进行操作。文本视图可以通过这些方法获得其文本：

public void setText(String text);
// or
public void setText(int resId); // the resource id

现在，您正在做的是给它一个 int(module.getCoefficient() return int) ，因此调用了第二种方法。现在，第二种方法需要 R.string.hello_world 之类的东西……但是，不是 0、100、8593 等等……但是，您给出的是我给出的第二种情况。那会给出那个错误。

解决方案

尝试将其更改为字符串。这些是这样做的 3 种方法：

使用String class:

holder.moduleCoefficient.setText(String.valueOf(module.getCoefficient()));

使用Integer class:

holder.moduleCoefficien.setText(Integer.toString(module.getCoefficient()));

使用String拼接：

holder.moduleCoefficient.setText(module.getCoefficient() + "");

recyclerview 未在片段中显示数据

recyclerview is not showing data in fragment

java

android

adapter

fragment

android-recyclerview

问题

解决方案