The error is "Call `Realm.init(Context)` before creating a RealmConfiguration"

private void addAction() {

        String what = mInputWhat.getText().toString();
        long now = System.currentTimeMillis();

       Realm.init(getContext());

        RealmConfiguration configuration = new RealmConfiguration.Builder().build();
        Realm.setDefaultConfiguration(configuration);


        Realm realm = Realm.getDefaultInstance();
        Drop drop = new Drop(what, now, 0, false);
        realm.beginTransaction();
        realm.copyToRealm(drop);
        realm.commitTransaction();
        realm.close();
    }
}

Here whenever i don't create a contexet the app crashes but when i create a context using Realm.init(getContext()) the "Add it" button don't workenter image description here