我想让它存储私有字符串keyy,但是不保存,会发生什么?我尝试使用textview来显示数据。
DatabaseReference myRef = FirebaseDatabase.getInstance().getReference().child("Users").child("Customers");
ValueEventListener eventListener = new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for(DataSnapshot nodo : dataSnapshot.getChildren()) {
String key = nodo.getKey();
Log.d("TAG", key);
keyy = key;
mSetting.setText(key); // yes, show data
}
}
@Override
public void onCancelled(DatabaseError databaseError) {}
};
myRef.addListenerForSingleValueEvent(eventListener);
mSetting.setText(keyy); // No,show data
最佳答案
我希望这能解决您的问题
List<String> keyList = new ArrayList();
DatabaseReference myRef = FirebaseDatabase.getInstance().getReference().child("Users").child("Customers");
ValueEventListener eventListener = new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for(DataSnapshot nodo : dataSnapshot.getChildren()) {
String key = nodo.getKey();
keyList.add(key);
}
done(keyList);
}
@Override
public void onCancelled(DatabaseError databaseError) {}
};
myRef.addListenerForSingleValueEvent(eventListener);
public void done(List k)
{
//show keys here
}