如何在firebase android中添加新数据 [英] How to add new data in firebase android

问题描述

这是我在 firebase 实时数据库中添加新人的逻辑.但它只是用新数据更新旧数据，而不是创建新条目.

This is my logic for adding new person in firebase realtime databse. But instead of making a new entry it is just updating the old data with new one.

buttonSave.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {


            /*
            new Firebase(Config.FIREBASE_URL)
                    .push()
                    .child("title")
                    .setValue(text.getText().toString());
            */

            Firebase ref = new Firebase(Config.FIREBASE_URL);
            String name = editTextName.getText().toString().trim();
            String address = editTextAddress.getText().toString().trim();

            //Creating Person object
            Person person = new Person();

            //Adding values
            person.setName(name);
            person.setAddress(address);
            ref.child("Person").setValue(person);

        }
    });


    new Firebase(Config.FIREBASE_URL).addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot snapshot) {
            for (DataSnapshot postSnapshot : snapshot.getChildren()) {
                //Getting the data from snapshot
                Person person = postSnapshot.getValue(Person.class);

                //Adding it to a string
                String string = "Name: "+person.getName()+"
Address: "+person.getAddress()+"

";

                //Displaying it on textview
                textViewPersons.setText(string);
            }
        }

        @Override
        public void onCancelled(FirebaseError firebaseError) {
            System.out.println("The read failed: " + firebaseError.getMessage());
        }
    });

这里有什么问题?有人可以帮我吗?

What is wrong here? Can anyone help me on this?

推荐答案

您总是使用相同的参考

 Person person = new Person();
 //Adding values
 person.setName(name);
 person.setAddress(address);
 ref.child("Person").setValue(person);

检查文档:

以这种方式使用 setValue() 会覆盖指定位置的数据，包括任何子节点.

Using setValue() in this way overwrites data at the specified location, including any child nodes.

在您的情况下，由于这个原因，您覆盖了相同的数据.

In your case you are overriding the same data for this reason.

每次将新子项添加到指定的 Firebase 引用时，您都应该使用 push() 方法生成唯一 ID.

You should use the push() method to generate a unique ID every time a new child is added to the specified Firebase reference.

 Person person = new Person();
 //Adding values
 person.setName(name);
 person.setAddress(address);
 DatabaseReference newRef = ref.child("Person").push();
 newRef.setValue(person);

这篇关于如何在firebase android中添加新数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！