Java 从Firebase检索一些数据并将其放在RecyclerView上
如何在Java 从Firebase检索一些数据并将其放在RecyclerView上,java,android,firebase,android-recyclerview,Java,Android,Firebase,Android Recyclerview,如何在RecyclerView中从Firebase检索Rute数据,其中Sofer是相等的用户名 这是我火力基地的一部分。我试着这样做,但出现了所有的数据 public void onStart() { super.onStart(); DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference(); DatabaseReference ruteRef = rootRef.child(
RecyclerView
中从Firebase检索Rute数据,其中Sofer是相等的用户名
这是我火力基地的一部分。我试着这样做,但出现了所有的数据
public void onStart() {
super.onStart();
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference ruteRef = rootRef.child("Rute");
assert user != null;
Query query = ruteRef.orderByChild("Sofer").equalTo(user.getDisplayName());
query.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Model, ViewHolder>(Model.class, R.layout.card_layout, ViewHolder.class, mRef) {
@Override
protected void populateViewHolder(ViewHolder viewHolder, Model model, final int position) {
viewHolder.setDetails(getContext(), model.getTaraPlecare(), model.getTaraDestinatie(), model.getSofer(),
model.getCapTractor(), model.getRemorca(), model.getNumeleIncarcaturii(), model.getDataPlecare(),
model.getOrasPlecare(), model.getOrasDestinatie());
viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Intent intent = new Intent(Fridge.this, Show.class);
// startActivity(intent);
}
});
}
};
RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(getActivity(), 1);
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setAdapter(firebaseRecyclerAdapter);
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
Toast.makeText(getContext(), "Eroare", Toast.LENGTH_LONG).show();
}
});
}
public void onStart(){
super.onStart();
DatabaseReference rootRef=FirebaseDatabase.getInstance().getReference();
数据库引用ruteRef=rootRef.child(“Rute”);
断言用户!=null;
Query Query=ruteRef.orderByChild(“Sofer”).equalTo(user.getDisplayName());
query.addListenerForSingleValueEvent(新的ValueEventListener()){
@凌驾
public void onDataChange(@NonNull DataSnapshot DataSnapshot){
firebaseRecyclerAdapter=新的firebaseRecyclerAdapter(Model.class、R.layout.card_布局、ViewHolder.class、mRef){
@凌驾
受保护的void populateViewHolder(ViewHolder ViewHolder、模型模型、最终int位置){
viewHolder.setDetails(getContext()、model.getTaraPlecare()、model.getTaraDestinatie()、model.getSofer()、model,
model.getCapTractor()、model.getRemorca()、model.getNumeleIncarcaturii()、model.getDataPlecare()、model,
model.getOrasPlecare(),model.getOrasDestinatie());
viewHolder.itemView.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
//意向=新意向(冰箱、本、秀、类);
//星触觉(意向);
}
});
}
};
RecyclerView.LayoutManager mLayoutManager=新的GridLayoutManager(getActivity(),1);
mRecyclerView.setLayoutManager(mllayoutmanager);
mRecyclerView.setAdapter(firebaseRecyclerAdapter);
}
@凌驾
已取消的公共void(@NonNull DatabaseError DatabaseError){
Toast.makeText(getContext(),“Eroare”,Toast.LENGTH_LONG.show();
}
});
}
我建议您将现有结构替换为:
Rute:
[
{ "Username1":
//All your data related to Username
},
{ "Username2":
//All your data related to Username
},
{ "Username3":
//All your data related to Username
}
]
以上结构将帮助你实现你想要的
如何在Sofer等于用户显示名的recyclerview中从firebase检索Rute数据
只需使用以下查询:
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference ruteRef = rootRef.child("Rute");
Query query = ruteRef.orderByChild("Sofer").equalTo("userDisplayName");
query.addListenerForSingleValueEvent(/* ... */);
是一种推荐的方法,您可以使用
FirebaseRecyclerAdapter
从Firebase实时数据库检索数据,并将其显示在RecyclerView
中。CardView中也出现了所有子项,我编辑了问题并添加了启动代码,可能是我犯了错误。不,你不应该这样做。使用Firebase UI并将该查询传递给回答中解释的FirebaseRecyclerOptions
对象,对吗?