从Firebase数据库（Android）中删除字段

Question

我找不到从Firebase数据库中删除股票的方法：

    public void deleteFromFirebase(String user_id) {
        FirebaseDatabase database = FirebaseDatabase.getInstance();
        DatabaseReference myRef = database.getReference("users").child(user_id);

        myRef.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                User user = dataSnapshot.getValue(User.class);
               //No metter what i did, it did not delete from fb
            }

    @Override
    public void onCancelled(DatabaseError error) {
        // Failed to read value
    }
});
}

谁能给我指一下正确的方向吗？谢谢

Answer 1

只需将null作为一个值放在该子项中

FirebaseDatabase.getInstance().getReference("users").child(user_id).setValue(null);

最新消息

按值删除

public void deleteFromFirebase(String user_id,final String stockName) {
        FirebaseDatabase database = FirebaseDatabase.getInstance();
        DatabaseReference myRef = database.getReference("users").child(user_id).child("user_stocks");

        myRef.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override 
            public void onDataChange(DataSnapshot dataSnapshot) {
                for (DataSnapshot stock : dataSnapshot.getChildren()) {
                if(stock.getValue().equals(stockName))
                    stock.getRef().removeValue();
               }
            } 

    @Override 
    public void onCancelled(DatabaseError error) {
        // Failed to read value 
    } 
}); 
}