Drawing pause Screen as a layer over the play screen-LibGdx

Question

In my LibGdx Game I created pause functionality.While playing game,If I press pause button,a separate screen with resume button displays.

What actually I want to do is t

Answer 1

Short answer: yes, you can. First let your pause screen extend the Stage class instead of the Screen class. Then try calling the draw of the pause screen after the draw of the game. Something like this:

public void render(){
    UpdateGame();
    pause_screen.act();

    DrawGame();
    pause_screen.draw();
}

Stop the game updates when the pause screen is open. Off course this is over simplified, but you can look in to it.

Answer 2

Inside Gamescreen, you're using stage for UI(buttons to navigate). I am pretty sure you're doing like this.

private uiStage;
private boolean isPause;
private Group pauseGroup; 

public void render(){

    if(!isPause) UpdateGame();    
    DrawGame();         

    uiStage.act();
    uiStage.draw();
}

Create a Group whenever you want to pause your game and remove that group when you want to resume your game. You can also crate your Group once and add all pause UI in show() method. Add that group to stage when you want to show pause and remove when you resume your game.

public void pauseGame(){

   isPause = true;
   pauseGroup = new Group;
   Image semiTransparentBG= ......
   // setSize(Size of screen) and make it semi transparent.
   pauseGroup.addActor(semiTransparentBG);

   //crate all other pause UI buttons with listener and add to pauseGroup

   stage.addActor(pauseGroup);

}

public void resumeGame(){

    if(isPause){
      isPause=false;
      pauseGroup.remove();
    }  
}