private DebugDrawer debugDrawer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //...

        SwitchAction switchAction = new SwitchAction("Test switch", new SwitchAction.Listener() {
            @Override
            public void onCheckedChanged(boolean value) {
                Toast.makeText(MainActivity.this, "Switch checked", Toast.LENGTH_LONG).show();
            }
        });

        ButtonAction buttonAction = new ButtonAction("Test button", new ButtonAction.Listener() {
            @Override
            public void onClick() {
                Toast.makeText(MainActivity.this, "Button clicked", Toast.LENGTH_LONG).show();
            }
        });

        SpinnerAction<String> spinnerAction = new SpinnerAction<>(
            Arrays.asList("First", "Second", "Third"),
            new SpinnerAction.OnItemSelectedListener<String>() {
                @Override public void onItemSelected(String value) {
                    Toast.makeText(MainActivity.this, "Spinner item selected - " + value, Toast.LENGTH_LONG).show();
                }
            }
        );

        debugDrawer = new DebugDrawer.Builder(this)
            .modules(
                new ActionsModule(switchAction, buttonAction, spinnerAction),
                new FpsModule(Takt.stock(getApplication())),
                new LocationModule(this),
                new ScalpelModule(this),
                new TimberModule(),
                new OkHttp3Module(okHttpClient),
                new PicassoModule(picasso),
                new GlideModule(Glide.get(getContext())),
                new DeviceModule(this),
                new BuildModule(this),
                new NetworkModule(this),
                new SettingsModule(this)
            ).build();
    }

public class DebugDrawerApplication extends Application {
        @Override
        public void onCreate() {
            super.onCreate();

            LumberYard lumberYard = LumberYard.getInstance(this);
            lumberYard.cleanUp();

            Timber.plant(lumberYard.tree());
            Timber.plant(new Timber.DebugTree());
        }
    }

public interface DebugModule {

        /**
         * Creates module view
         */
        @NonNull View onCreateView(@NonNull LayoutInflater inflater, @NonNull ViewGroup parent);

        /**
         * Override this method if you need to refresh
         * some information  when drawer is opened
         */
        void onOpened();

        /**
         * Override this method if you need to stop
         * some actions  when drawer is closed
         */
        void onClosed();

        /**
         * Override this method if you need to start
         * some processes
         */
        void onResume();

        /**
         * Override this method if you need to do
         * some clean up
         */
        void onPause();

        /**
         * Override this method if you need to start
         * some processes that would be killed when
         * onStop() is called
         * E.g. register receivers
         */
        void onStart();

        /**
         * Override this method if you need to do
         * some clean up when activity goes to foreground.
         * E.g. unregister receivers
         */
        void onStop();
    }