java - FireStore 数据未显示正在访问隐藏方法 Lsun/misc/Unsafe;->putLong(Ljava/lang/Object;JJ)V(灰名单、链接、允许)

Question

当我尝试使用 FirestoreRecyclerAdapter 从 Firestore 检索数据时，它没有显示。

错误日志

Accessing hidden method Lsun/misc/Unsafe;->getInt(Ljava/lang/Object;J)I (greylist, linking, allowed)

Accessing hidden method Lsun/misc/Unsafe;->getObject(Ljava/lang/Object;J)Ljava/lang/Object; (greylist, linking, allowed)

Java 代码

    //FirebaseFireStore Variable
    firebaseFirestore = FirebaseFirestore.getInstance();
    //RecyclerView Variable
    recyclerView = findViewById(R.id.recyclerViewId);
    //Query
    Query query = firebaseFirestore.collection("root");
    //RecyclerOption
    FirestoreRecyclerOptions<TestModel> options = new FirestoreRecyclerOptions.Builder<TestModel>()
            .setQuery(query, TestModel.class)
            .build();
    //FirestoreRecyclerAdapter
    adapter = new FirestoreRecyclerAdapter<TestModel, MyTestViewHolder>(options) {
        @NonNull
        @Override
        public MyTestViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.test_item, parent, false);
            return new MyTestViewHolder(view);
        }
        @Override
        protected void onBindViewHolder(@NonNull TestActivity.MyTestViewHolder holder, int position, @NonNull TestModel model) {
            holder.tit.setText(model.getmTitle());
            holder.sto.setText(model.getmStory());
        }
    };
    recyclerView.setHasFixedSize(true);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));
    recyclerView.setAdapter(adapter);
}
private class MyTestViewHolder extends RecyclerView.ViewHolder {
    TextView tit, sto;
    public MyTestViewHolder(@NonNull View itemView) {
        super(itemView);
        tit = itemView.findViewById(R.id.testTitleId);
        sto = itemView.findViewById(R.id.testStoryId);
    }
}
@Override
protected void onStart() {
    super.onStart();
    adapter.startListening();
}
@Override
protected void onStop() {
    super.onStop();
    adapter.stopListening();
}

模型类

 String mTitle, mStory;

public TestModel(String mTitle, String mStory) {
    this.mTitle = mTitle;
    this.mStory = mStory;
}

private TestModel(){}

public String getmTitle() {
    return mTitle;
}

public void setmTitle(String mTitle) {
    this.mTitle = mTitle;
}

public String getmStory() {
    return mStory;
}

public void setmStory(String mStory) {
    this.mStory = mStory;
}

FireStore Concole

Answer 1

当您尝试将 Firestore 中的文档映射到“TestModel”类型的对象时，类中存在的字段名称必须与数据库中存在的属性名称相匹配。不幸的是，在您的情况下，这些字段不匹配。你看，数据库中的字段称为“故事”和“标题”，而在类中称为“mStory”和“mTitle”，这是不正确的。

要解决这个问题，您有两个选择，您可以更改数据库中属性的名称以匹配类中的名称，或者您可以在 getter 前面使用注释。例如，对于“mTitle”字段，您的 getter 应如下所示:

@PropertyName("title")
public String getTitle() {
    return mTitle;
}

通过这种方式，您告诉编译器查找名为“title”而不是“mTitle”的属性。