setChecked(boolean checked); //by default, it's wthout animation
setChecked(boolean checked, boolean animate);  //pass true to animate

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_sample);

    final CustomCheckBox scb = (CustomCheckBox) findViewById(R.id.scb);
    scb.setOnCheckedChangeListener(new CustomCheckBox.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CustomCheckBox checkBox, boolean isChecked) {
            Log.d("CustomCheckBox", String.valueOf(isChecked));
        }
    });
}