Android 无法按升序检索数据
我想按升序检索数据,但收到的数据以某种方式按降序添加到RecycleView Firebase数据库: 我在做什么:Android 无法按升序检索数据,android,firebase,firebase-realtime-database,firebaseui,Android,Firebase,Firebase Realtime Database,Firebaseui,我想按升序检索数据,但收到的数据以某种方式按降序添加到RecycleView Firebase数据库: 我在做什么: DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference().child("/Teacher"); Query query = mDatabase.orderByChild("rating"); FirebaseRecyclerOptions<Teache
DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference().child("/Teacher");
Query query = mDatabase.orderByChild("rating");
FirebaseRecyclerOptions<Teacher> options =
new FirebaseRecyclerOptions.Builder<Teacher>()
.setQuery(query, Teacher.class)
.build();
FirebaseRecyclerAdapter adapter = new FirebaseRecyclerAdapter<Teacher, TeacherViewHolder>(options) {
@NonNull
@Override
public TeacherViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.teacher_list_item, parent, false);
return new TeacherViewHolder(view);
}
@Override
protected void onBindViewHolder(@NonNull final TeacherViewHolder holder, int position, @NonNull final Teacher model) {
// some stuff here
}
};
DatabaseReference mDatabase=FirebaseDatabase.getInstance().getReference().child(“/Teacher”);
Query Query=mDatabase.orderByChild(“评级”);
FirebaseRecyclerOptions选项=
新的FirebaseRecyclerOptions.Builder()
.setQuery(查询,教师.class)
.build();
FirebaseRecyclerAdapter=新的FirebaseRecyclerAdapter(选项){
@非空
@凌驾
public TeacherViewHolder onCreateViewHolder(@NonNull ViewGroup父级,int-viewType){
View=LayoutInflater.from(parent.getContext())
.充气(R.layout.teacher\u list\u项目,父项,false);
返回新的TeacherViewHolder(视图);
}
@凌驾
受保护的无效onBindViewHolder(@NonNull final TeacherViewHolder,int位置,@NonNull final Teacher model){
//这里有些东西
}
};
由于无法使用RTDB以本机方式执行此操作,您可能需要执行以下操作:
LinearLayoutManager layoutManager = new LinearLayoutManager(context);
layoutManager.setReverseLayout(true);
layoutManager.setStackFromEnd(true);
recyclerView.setLayoutManager(layoutManager);
有关更多详细信息,请参阅。要获得排序和筛选结果,必须将查询传递到FirebaseRecyclerAdapter构造函数:
public MyFireAdapterDiasFiestaRecyclerView(
Class<DiaFiestaMeta> modelClass,
int modelLayout,
Class<MyFireViewHolder> viewHolderClass,
Query query) {
...
adapter = new MyFireAdapterDiasFiestaRecyclerView(
DiaFiestaMeta.class,
layout_that_you_use,
MyFireViewHolder.class,
ref.orderByChild("property_to_sort_and_filter_on").equalTo("value_to_filter_on")
);