loading spinner in android kotlin code example

Example: loading android studio

import android.os.Handler;
Runnable runnable = new Runnable() {
            @Override
            public void run() {
                Intent intent = new Intent(getApplicationContext(), inscription.class);
                startActivity(intent);
                finish();
            }
        };
        //....
        new Handler().postDelayed(runnable,3000);
    }