Moving platform collision detection

Question

I have a moving platform at constant speed and I need to update my player position when my olayer jump ont that platform. But I have problems with collision detection. Here how I try to detect collision between my player's bottom Rectangle and platform Rectangle.

    for(GameObject t2 : list){
                    if(t2 instanceof Platform){

                        platform = (Platform) t2;
                        render.rect(platform.getHitBox().getX(), 
                                    platform.getHitBox().getY(),
                                    platform.getHitBox().getWidth(),
                                    platform.getHitBox().getHeight());

                        platform.update(Gdx.graphics.getDeltaTime(), 0,
                                        player1.getHitBox().getX(), 
                                        Gdx.graphics.getWidth());

                        if(platform.getHitBox().overlaps(player1.getHitBox())
                           ||player1.getHitBox().overlaps(platform.getHitBox())){

                            System.out.println("true");

                            platformPositonX = player1.getHitBox().getX() 
                                              + platform.getUpdateSpeed();

                            player1.action2(1, platformPositonX, 
                                           (platform.getHitBox().y +
                                           platform.getHitBox().height));

                        }else{
                            System.out.println("false");
                        }
                    }
}

Here's my print screen and my result printed in concole As you can see my collision don't work correctly. When my character is not on the platform my result are correct I get false but when my character is on the platform i got true, false, false, true, ......

Answer 1

Finally I found out what's wrong. In this line I need to substract a number

 player1.action2(1, platformPositonX,(platform.getHitBox().y + platform.getHitBox().height - 5 ));

Now all works!