Common operations for Realm in Android

AndroidRealmSnippets

// check if Realm db exist
RealmConfiguration config = getConfig();
if (new File(config.getPath()).exists()) {
  // exists
} else {
  // don't exists
}

// check if Realm is closed
if(realm.isClosed()) {
    // Do something
}

// delete classes within Realm:
Realm realm = Realm.getInstance(context);
realm.beginTransaction();
realm.clear(ThisClass.class);
realm.clear(ThatClass.class);
realm.commitTransaction();
realm.close();

// check if there is any data
Realm realm = Realm.getInstance(context);
realm.isEmpty();

// check if data exist - alt
ThisClass thisClass = realm.where(ThisClass.class).equalTo("someID", thisID).findFirst();
if (thisClass != null) {
    // Exists
} else {
    // Not exist
}

// add or update a note
public void storeItems( String id, String title ,String location) {
    realm.beginTransaction();
    ItemsRealmClass items = new ItemsRealmClass();
    items.setobjectId(id);
    items.setLocation(location);
    items.setTitle(title);
    if (realm.where(ItemsRealmClass.class).equalTo("objectID", id).count() == 0) {
        // there are no object with this `Id`
        realm.copyToRealmOrUpdate(items);
    } 
    Toast.makeText(context, "Items Stored!", Toast.LENGTH_SHORT).show();
    realm.commitTransaction();
}