[Android] check via SharedPreferences, if it's the very first appstart

Android - check first run.java

public boolean isFirstRun() { // returns true if it's the first start, otherwise false
        boolean isFirstRun = getSharedPreferences("PREFERENCE", MODE_PRIVATE).getBoolean("isFirstRun", true);
        if (isFirstRun){
            getSharedPreferences("PREFERENCE", MODE_PRIVATE)
                    .edit()
                    .putBoolean("isFirstRun", false)
                    .apply();
            return true;
        }
        return false;
    }