title: LibGDX TextButton do not respond to mouse clicks
body: <p>The text button draws normally (no errors or warnings) but it doesn't respond to mouse clicks. The situation is the same on Desktop and Android build. I've read and followed every topic about it with no results. What am I doing wrong? </p>
  
  <p>Maybe I need to set something in stage object? </p>
  
  <p>Here's my <code>MenuScreen</code> class code:</p>
  
  <pre><code>public class MenuScreen implements Screen {
  private OrthographicCamera camera;  
  private BitmapFont font;
  private TextureAtlas menuGraphics;
  
  Stage stage;
  TextButton button;
  TextButtonStyle buttonStyle;
  Skin skin;
  
  public MenuScreen(Game game)
  {
      //create satage object
      stage = new Stage();
  
      //create font object
      font = new BitmapFont(Gdx.files.internal("data/arial-15.fnt"),false);
      font.setColor(Color.RED);
  
      //load buttons texture atlas and create Skin object
      menuGraphics = new TextureAtlas( Gdx.files.internal( "buttons/buttons.pack" ) );
      skin = new Skin();
      skin.addRegions(menuGraphics);
  
      // Store the default libgdx font under the name "defaultFont".
      skin.add("defaultFont",font);
  
      //Set button style
      buttonStyle = new TextButtonStyle();
      buttonStyle.up = skin.newDrawable("yellow");
      buttonStyle.down = skin.newDrawable("orange");
      buttonStyle.checked = skin.newDrawable("orange");
      buttonStyle.over = skin.newDrawable("orange");
      buttonStyle.font = skin.getFont("defaultFont");
  
      skin.add("default", buttonStyle);
  
      //assign button style
      button=new TextButton("PLAY",buttonStyle);
      button.setPosition(200, 200);
      button.setSize(200,200);
  
  
      //add button to stage
      stage.addActor(button);
  
      //add click listener to the button
      button.addListener(new ClickListener() {
          public void clicked(InputEvent event, float x, float y) {
              button.setText("Starting new game");
              Gdx.app.log("MenuScreen", "clicked button");
  
          }
      });
  
      Gdx.app.log("MenuScreen", "create");
  }
  
  @Override
  public void resize(int width, int height )
  {
      float aspectRatio = (float) width / (float) height;
      camera = new OrthographicCamera(640, 360);
      camera.translate(320,180);
      camera.update();
  
      stage.setViewport(new FillViewport(640, 360, camera));
      stage.getViewport().setCamera(camera);
  
      Gdx.app.log( "MenuScreen", "Resizing screen to: " + width + " x " + height );
  }
  
  @Override
  public void show() {       
      Gdx.input.setInputProcessor(stage);
  
      float w = Gdx.graphics.getWidth();
      float h = Gdx.graphics.getHeight();
  
      resize((int)w,(int)h);
  
      Gdx.app.log( "MenuScreen", "Show screen code" );
  }
  
  @Override
  public void render(float delta)
  {
      Gdx.gl.glClearColor( 0f, 1f, 0f, 1f );
      Gdx.gl.glClear( GL20.GL_COLOR_BUFFER_BIT );
  
      stage.act( delta );
  
      // draw the actors
      stage.draw();       
  }
  
  @Override
  public void dispose()
  {
  
  }
  
  @Override
  public void pause() {
  
  }
  
  @Override
  public void resume() {
  
  }
  
  @Override
  public void hide() {
  
  }
  </code></pre>
  
  <p>}</p>