0
FirebaseOptions options = new FirebaseOptions.Builder()
.setCredential(FirebaseCredentials.applicationDefault())
.setDatabaseUrl("https://mkastrive.firebaseio.com")
.build();
FirebaseApp defaultApp = FirebaseApp.initializeApp(options);
DatabaseReference ref = defaultDatabase
.getInstance()
.getReference("users");
ref.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
System.out.println("in onDataChange");
System.out.println(dataSnapshot.getValue());
}
@Override
public void onCancelled(DatabaseError databaseError) {
System.out.println("in onCancelled");
System.out.println(databaseError.toString());
}
});
我正在Android中的Google雲模塊中執行上述操作。我認爲我的Firebase的初始化是成功的,因爲System.out.println("usersRef.push(): " + usersRef.push()); // Working
但我沒有看到addListenerForSingleValueEvent
的任何內容。我在日誌中也看不到任何錯誤/警告。我的數據庫規則是爲任何人設置的,以便能夠讀/寫數據。谷歌應用引擎中的Firebase管理員SDK設置
更新1:根據使用的setValue()的建議,我想對火力的文件的例子:
DatabaseReference usersRef1 = ref.child("users");
Map<String, User> users = new HashMap<String, User>();
users.put("alanisawesome", new User("June 23, 1912", "Alan Turing"));
users.put("gracehop", new User("December 9, 1906", "Grace Hopper"));
usersRef1.setValue(users);
但這不是在數據庫中插入或者,也沒有錯誤。日誌空白。
更新2: 一些日誌
FirebaseApp defaultApp = FirebaseApp.initializeApp(options);
this.defaultDatabase = FirebaseDatabase.getInstance().getReference();
defaultDatabase.child("users").getPath(): https://mkastrive.firebaseio.com
defaultDatabase.child("users").getPath(): /users