After export or import Realm library can't find Realm Objects

Question

For export my realm file I am using the next code:

File exportRealmFile;
            exportRealmFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM), "default.realm");
getRealm().writeCopyTo(exportRealmFile);

After that I am trying to import this file. I open Android Monitor and push file onto the another device.

But when I want to get RealmObject, for example, StatObject I see the object size is 0. But I know the size isn't 0.

 RealmResults<StatObject> statObjects =
                                realmForThisThread.where(StatObject.class).findAll();
LOG.debug("Size "+statObjects.size());

I open Stetho and I do not see any objects! But before export I saw seven different realm objects. However, the library itself has the same size. What am I doing wrong?

I am trying to import realm file using:

        RealmConfiguration realmConfiguration = new RealmConfiguration.Builder()
                .name("Realmexport.realm")
                .assetFile(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getPath())
                .build();
       // Realm.setDefaultConfiguration(realmConfiguration);

But nothing changed.

Import file:

File oldRealmFile = new File(getRealm().getPath());
File newFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM) ,"default.realm");
 FileOutputStream outputStream=null;
 FileInputStream inputStream=null;
 try {
     outputStream = new FileOutputStream(oldRealmFile);
     inputStream = new FileInputStream(newFile);
     byte[] buf = new byte[1024];
     int bytesRead;
     while ((bytesRead = inputStream.read(buf)) > 0) {
        outputStream.write(buf, 0, bytesRead);
     }
     outputStream.close();
     inputStream.close();
     }catch (IOException exc){
             exc.printStackTrace();
     }finally {
     }

This approach helps to import file but new file I can't use it. Because I don't see my Objects.

Answer 1

You're using assetFile in a wrong way. You're referencing an internal device location .assetFile(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getPath()) whereas the exported Realm should reside in the assets folder of your APK. Also specifying a name will create a new (empty) Realm.

Try the following configuration instead.

RealmConfiguration config = new RealmConfiguration.Builder().assetFile("myExported").build();

Your APK:

└── src └── main ├── AndroidManifest.xml ├── assets │   └── myExported.realm ├── java └── res

Answer 2

.assetFile(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getPath())

should be

.directory(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM))