Question

I don’t need the code for the creation Dialog box on an activity.
I use opengles and i am drawing with the renderer class i create . I think the execution at the android activity window stays at main activity.
I have states of my drawing and when a draw reach a state i want to post a dialog box. So there is a problem with that because the dialogbox builder wants a context and the renderer class isnt an activity object.
I am new at opengles and firstly all the work i do exists at
method

public void onDrawFrame(GL10 gl)
{ }

so i have 2 classes 1st the ui class

mainactivity extends activity

and second the renderer class

class mainrenderer implements GLSurfaceView.Renderer

i want from the second class to use activity operations such as create dialog box .
Can you give me a solution to this ?
Thanks.

In other words i want from a class (renderer) that isn’t ui class to make a dialogbox .

edited

i pass the context of my activity class
as myrender = new Renderer1(this);
at constructor of Renderer i have

class Renderer1 implements GLSurfaceView.Renderer
/* initializations */

public Renderer(Context context) {
 super();
 mcontext = context; 
}

and after that i have implement the on drawFrame method and when i reach a state i call the method alertdialogbox()
given below

 public void alertdialogbox()  /* some code */  AlertDialog.Builder
 builder = new AlertDialog.Builder(mcontext);

but it keeps erroring and application crashes when reach the state that the alertdialogbox called

the error begins with

java.lang.RuntimeException : Can’t create handler inside thread that
has not called Looper.prepare()

Edit 2 solved
i initialize a handler at main activity as :

Handler handler = new Handler() {
          @Override
          public void handleMessage(Message msg) {
              alertdialogbox();
             }
         };

alertdialogbox is a method that i declare inside main activity class
and constructs the dialogbox

again inside the main activity where i instantiate the GlsurfaceView and the Glrenderer
i pass the handler that i initialize before so :

    Renderer = new Renderer1(handler);  
after that at the class Renderer1

    class Renderer1 implements GLSurfaceView.Renderer
     Handler mhandler;

    public Renderer( Handler handler) {
     super();
     mhandler = handler; 
    }

    *
    *
public void onDrawFrame(){
*
*

if (state) 
{ 
alertdialogbox();
 }
}
*
*
     public void alertdialogbox()
        {

            mhandler.sendEmptyMessage(1);

        }

and finally i have my dialogbox viewed.

thanks for the suggetions .

Answer 1

When creating a AlertDialog (or any other UI widget) from another class, you must have a reference to your activity class and with that object, you can call activity.runOnUIThread() to execute any code related to your AlertDialog.