<com.xxx.SlotMachineView
    android:id="@+id/sm_view"
    android:layout_width="281dp"
    android:layout_height="145dp"
    android:layout_gravity="center_horizontal" />

public class SlotMachineActivity extends Activity {

private SlotMachineView slotMachineView;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.avtivity_slot_machine);

    slotMachineView = findViewById(R.id.sm_view);
    slotMachineView.setOnScrollListener(new SlotMachineView.OnScrollListener() {
        @Override
        public void onStop(int bingoIndex) {

        }
    });

    findViewById(R.id.btn_mix).setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            slotMachineView.setBingoIndex(INDEX_COIN);
            slotMachineView.startSm();
        }
    });
}