CODEWITHSUNDEEP
androidfirebasefirebase-realtime-database
Vincent Macharia
Vincent Macharia

Reputation: 475

com.google.firebase.database.DatabaseException: Calls to setPersistenceEnabled() must be made before any other usage of FirebaseDatabase instance

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();

Upvotes: 35

Views: 19708

Answers (9)

RileyManda
RileyManda

Reputation: 2641

Create an application class that will be used across your entire application and initialize firebase Persistence in it: The Class should extend Application.( ClassName extends Application):

Heres An Example:

FirebaseHandler class

You can call/name the class whatever you want to name it

public class FirebaseHandler extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        FirebaseDatabase.getInstance().setPersistenceEnabled(true);   
    }
}

Add the application class to your Manifest:

 <application
    android:name=".FirebaseHandler"
    android:allowBackup="true"
    android:icon="@mipmap/app_icon"
    android:label="@string/app_name"
    android:theme="@style/AppTheme">

This way data persistance will be applied to your entire project. Inorder to apply disk persistence to specific data.

DatabaseReference myRef=FirebaseDatabase.getInstance().getReference("people"); 
myRef.keepSynced(true);

This will keep your offline data synced and up to date

myRef.keepSynced(true);

Learn more about Disk Persistence Here

Upvotes: 16

Lakpriya Senevirathna
Lakpriya Senevirathna

Reputation: 5109

This works for me. Add this to your launching activity!

try {           
    FirebaseDatabase.getInstance().setPersistenceEnabled(true);
} catch (Exception e) {}

Upvotes: 1

MetaPlanet
MetaPlanet

Reputation: 129

If you are using Kotlin, the following code worked for me. I declared as private member variable at the top of the class.

private val firebaseInstance = FirebaseDatabase.getInstance().apply { setPersistenceEnabled(true) }

Upvotes: 1

Isaac Sekamatte
Isaac Sekamatte

Reputation: 5598

You could try checking if there are any initialized firebase apps before calling setPersistenceEnabled.

if (FirebaseApp.getApps(this).size() == 0)
    FirebaseDatabase.getInstance().setPersistenceEnabled(true);

Upvotes: 0

Vishal G. Gohel
Vishal G. Gohel

Reputation: 1033

This solution works for me without extends android.app.Application

private static FirebaseDatabase firebaseDatabase;

    if (firebaseDatabase == null) {
        firebaseDatabase=FirebaseDatabase.getInstance();
        firebaseDatabase.setPersistenceEnabled(true);
    }
    /* Do your other stuff  */

OR

if (savedInstanceState == null) {
   FirebaseDatabase.getInstance().setPersistenceEnabled(true);
}

Upvotes: 6

Kartik Watwani
Kartik Watwani

Reputation: 129

If you extend a ContentProvider in your app you can call FirebaseDatabase.getInstance().setPersistenceEnabled(true); in your ContentProvider's onCreate() method because this method is called even before the onCreate() method of your launcher activity. This will also be useful when you use TaskStackBuilder in your app to create a synthetic stack of activities to skip some activities and move forward like when you use in app notifications. So when you come back to the launcher activity moving backwards you might have already used FirebaseDatabase instance somewhere in your application and the error you are getting might pop up in this case as well.

Upvotes: 3

zarsky
zarsky

Reputation: 720

Just add this at the top of your activity class:

static {
    FirebaseDatabase.getInstance().setPersistenceEnabled(true);
}

Worked for me, not sure if it's the best practice though.

Upvotes: 5

Siddhesh Dighe
Siddhesh Dighe

Reputation: 2954

According to Firebase Documentations setPersistenceEnabled is to be called only once (before any other instances of FirebaseDatabase are made)

So the solution to this issue for me was the following

  1. You need to create a class which extends android.app.Application and setPersistenceEnabled(true) over there.

For Example

class MyFirebaseApp extends android.app.Application 

@Override
public void onCreate() {
    super.onCreate();
    /* Enable disk persistence  */
    FirebaseDatabase.getInstance().setPersistenceEnabled(true);
}
  1. In the Manifest, link the MyFirebaseApp class to the application tag

For Example

in your application tag add the following

android:name="com.example.MyFirebaseApp"

this should work fine.

Also don't use setPersistenceEnabled in any other Activity.

Upvotes: 107

Frank van Puffelen
Frank van Puffelen

Reputation: 598847

Something like this (iirc):

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

Upvotes: 24

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