Firebase实时数据库无法正常运行,setValue [英] Firebase realtime databae not working, setValue
本文介绍了Firebase实时数据库无法正常运行,setValue的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我通过教程制作了样本 ' https://firebase.google.com/docs/database/android/start/?hl = ko "用于Firebase实时数据库
I made sample by tutorial 'https://firebase.google.com/docs/database/android/start/?hl=ko' for Firebase realtime database
但是在onDataChanged
'EventValueListner'
But I cannot see any data after onDataChanged
'EventValueListner'
你能解释为什么吗?
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference myRef = database.getReference("message");
myRef.setValue("Hello, World!");
// Read from the database
myRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
// This method is called once with the initial value and again
// whenever data at this location is updated.
String value = dataSnapshot.getValue(String.class);
Log.d("TAG", "Value is: " + value);
}
@Override
public void onCancelled(DatabaseError error) {
// Failed to read value
Log.w("TAG", "Failed to read value.", error.toException());
}
});
这是我的代码.
我怎么了?
推荐答案
此示例将在firebase数据库中插入新的用户数据.
this example will insert new user data in firebase db.
FirebaseDatabase database;
DatabaseReference usersTable;
database = FirebaseDatabase.getInstance();
usersTable = database.getReference("Users");
/*we work here */
usersTable.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
progressDialog.dismiss();
if (dataSnapshot.child(phoneEditText.getText().toString()).exists()) {
Toast.makeText(SignUp.this, "Number already register", Toast.LENGTH_SHORT).show();
}else{
Users users = new Users(nameEditText.getText().toString(),passwordEditTex.getText().toString(),phoneEditText.getText().toString());
usersTable.child(phoneEditText.getText().toString()).setValue(users);
Toast.makeText(SignUp.this, "Signup Sucessfully", Toast.LENGTH_SHORT).show();
finish();
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
希望这对您有帮助
这篇关于Firebase实时数据库无法正常运行,setValue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!
查看全文