public class YourGame extends ApplicationAdapter {
    public void create() {
        Gdx.input.setInputProcessor(new InputProcessor() {
            @Override
            public boolean touchUp(int screenX, int screenY, int pointer, int button) {
                // Handle touch up here
                return false;
            }

            @Override
            public boolean touchDragged(int screenX, int screenY, int pointer) {
                // Handle dragging here
                return false;
            }

            @Override
            public boolean touchDown(int screenX, int screenY, int pointer, int button) {
                // Handle touch down here
                return false;
            }

            @Override
            public boolean scrolled(int amount) {
                return false;
            }

            @Override
            public boolean mouseMoved(int screenX, int screenY) {
                return false;
            }

            @Override
            public boolean keyUp(int keycode) {
                return false;
            }

            @Override
            public boolean keyTyped(char character) {
                return false;
            }

            @Override
            public boolean keyDown(int keycode) {
                return false;
            }
        });
    }