com.google.firebase.database.DatabaseException:必须在使用 FirebaseDatabase 实例之前调用 setPersistenceEnabled() [英] com.google.firebase.database.DatabaseException: Calls to setPersistenceEnabled() must be made before any other usage of FirebaseDatabase instance

问题描述

当我尝试在 fIREBASE 中设置 Persistence 时遇到问题，有人能解释一下如何解决吗，

I am having a problem when I try to setPersistence in fIREBASE,can someone please explain on how to go about it,

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_meal_details);

        if (mDatabase == null) {
            mDatabase = FirebaseDatabase.getInstance().getReference();
            FirebaseDatabase.getInstance().setPersistenceEnabled(true);
            // ...
        }


       // FirebaseDatabase.getInstance().setPersistenceEnabled(true);
        mDatabase = FirebaseDatabase.getInstance().getReference();

推荐答案

类似这样的事情 (iirc):

Something like this (iirc):

 if (mDatabase == null) {
     FirebaseDatabase database = FirebaseDatabase.getInstance();
     database.setPersistenceEnabled(true);
     mDatabase = database.getReference();
     // ...
 }

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