我正在尝试创建一种从我的Cloud Firestore database. 然后我会RecyclerView用上述列表设置一个适配器，它应该能很好地显示。截止目前，RecyclerView空空如也。（我还RecyclerView用虚拟项目测试了它们，它们显示得很好）
在我的方法结束时，项目列表仍然是空的。日志以奇怪的顺序显示（最后一个日志显示在其他日志之前）。日志顺序让我怀疑在侦听器中运行了一些单独的线程。我不确定如何同步它们。
private List<Project> projects;
private FirebaseFirestore db;
...在onCreateView()（我正在处理一个片段）：
db = FirebaseFirestore.getInstance();
queryAllProjects();
recyclerView.setAdapter(new ProjectRecyclerViewAdapter(projects, ...
...
private void queryAllProjects() {
projects = new ArrayList<>();
//I've already tried to make a local list and return that, however,
//the compiler would force me to declare the list as final here, and it wouldn't solve anything.
db.collection("projects")
.get()
.addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
if (task.isSuccessful()) {
for (QueryDocumentSnapshot document : task.getResult()) {
Log.d(TAG, document.getId() + " => " + document.getData());
Project project = document.toObject(Project.class);
projects.add(project);
}
Log.d(TAG, "After for loop: " + projects.toString());
//Here the list is OK. Filled with projects.
//I'd like to save the state of the list from here
} else {
Log.d(TAG, "Error getting document: ", task.getException());
Toast.makeText(getContext(), R.string.error, Toast.LENGTH_SHORT).show();
}
}
});
这是我一直在关注的官方文档
https://firebase.google.com/docs/firestore/query-data/get-data#custom_objects
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