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Ramosaurio
Asked: 2020-08-17 08:29:38 +0800 CST 2020-08-17 08:29:38 +0800 CST

Buttons with android and LibGDX

  • 772

Hello, I have created a small button in android, with very simple libGDX, but the problem is the following:

I have assigned a function that writes ("hola")something like this to the screen:

if(boton.sePulsa()){
   System.out.println("hola")
  }

and of course, it prints on the screen 3 times or more, "hola"and I want it to not print anything until it is pressed again. Any help pls.

//I edit the function sePulsa()is as follows:

public boolean sePulsaElBoton() {
    return Gdx.input.isTouched() && Gdx.input.getX() >= xMinima && Gdx.input.getX() <= xMaxima &&
            Gdx.input.getY() >= yMinima && Gdx.input.getY() <= yMaxima;
}

xMaxima,Xminima, Yminima ,YMaximaare of type float.

android

3 Answers

  1. Best Answer

    The most common option is to implement InputProcessor and through the TouchDown() method you could detect when the screen or your case, a button is pressed.

    https://libgdx.badlogicgames.com/nightlies/docs/api/com/badlogic/gdx/InputProcessor.html

    public class MyInputProcessor implements InputProcessor {

...

   @Override
   public boolean touchDown (int x, int y, int pointer, int button) {
      return false;
   }

...

}

    In the case of your implementation you could simply use:

    public boolean sePulsaElBoton() {
    return Gdx.input.isTouched();
}

    or JustTouched :

    public boolean sePulsaElBoton() {
    return Gdx.input.justTouched();
}
    • 2

  2. UsesGdx.input.justTouched();

    Gdx.input.isTouched()notifies if you have touched or are touching the screen, so if you spend 2 seconds pressing the button, it will print on the screen (in your case) as many messages as it can in that time.

    • 1

  3. This question is old but, if the button is a Actorlike the classes TextButton, Button, Table, Imageand others, you can add a to it EventListenerand that's it

    button.addListener(new ClickListener(){
    @Override
    public void clicked(InputEvent event, float x, float y) {
        super.clicked(event, x, y);
        System.out.println("Este botón se pulso!");
    }
});

    You have much more control, without the need to program it yourself.

    You can "Override" many methods...

    enter image description here

    The ones I personally use are:

    • InputListener: I use it when I want to detect when it is being pressed and when it is released, but it has much more methods for "Override".

    • ClickListener: I use it when I want to detect only one pulse, it still has many more methods for "Override"

    • ActorGestureListener: I use it when I want to detect a "Long press" which is when someone presses and leaves a button pressed for more than 1~ second

    Here is a list of all EventListeners:

    • InputListener

    • ClickListener

    • ActorGestureListener

    • ChangeListener

    • DragListener

    • DragScrollListener

    • FocusListener

    • TextArea.TextAreaListener

    • TextField.TextFieldClickListener

    • TextTooltip

    • tool tip

    • 1