检索当前用户的数据(user_id)Firebase? [英] Retrieve Current User's Data (user_id) Firebase?

问题描述

        firebaseAuth = FirebaseAuth.getInstance();
        mDatabase = FirebaseDatabase.getInstance();
        mDb = mDatabase.getReference();
        FirebaseUser user = firebaseAuth.getCurrentUser();
        userKey = user.getUid();

        mDb.child(userKey).addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                Log.d(TAG, "Name: " + dataSnapshot.child("user_id").getValue());

                userID = String.valueOf(dataSnapshot.child("user_id").getValue());
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });

我不知道我的代码有什么问题，我想检索用户ID的值.

I do not know what is wrong with my code, I want to retrieve value of user id.

推荐答案

要解决此问题，请使用以下代码:

To solve this, please use the following code:

firebaseAuth = FirebaseAuth.getInstance();
mDatabase = FirebaseDatabase.getInstance();
mDb = mDatabase.getReference();
FirebaseUser user = firebaseAuth.getCurrentUser();
userKey = user.getUid();

mDb.child("Tunanetra").child(userKey).addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        String userID = dataSnapshot.child("user_id").getValue(String.class);
        Log.d(TAG, "Name: " + userID);
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {}
});

使用此代码，您将能够在logcat中打印出经过身份验证并存在于Tunanetra节点下的用户的id.如果用户位于Orangtua节点下，则只需将Tunanetra更改为Orangtua.

With this code, you'll be able to print out in the logcat, the id of the users that is authenticated and exists under Tunanetra node. If the user exists under the Orangtua node, then just change Tunanetra with Orangtua.

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