Android onResume() not being called

Thank you everyone :) I have spent the whole day trying to fix this issue and I have just fixed the problem.

I found this Android onResume not called, and then I added some calls to Log.d() to try and figure out what was happening. By adding them to each method in AndroidDisplay and AndroidActvity, I noticed that when I turned the screen off and on, I had the output: 'ACTIVITY PAUSED', 'ACTIVITY STOPPED', 'ACTIVITY RESTARTED', and 'ACTIVITY RESUMED' which was what I had expected, then when clicking on the menu button, there was an extra output, 'SURFACE DESTROYED' and so I changed AndroidDisplay, to stop the thread from stopping when the surface was destroyed so I moved that code into a method called stopThread() and then I found that I had a problem with the fact that I was re-creating the same thread twice because of the surfaceCreated() method in AndroidDisplay, so then I made an if statement before calling androidGameThread.start() which used androidGameThread.isAlive() therefore fixing this issue.

New AndroidDisplay code:

package org.simplecorporation.myengine.core.android;

import org.simplecorporation.myengine.core.Settings;
import org.simplecorporation.myengine.core.game.BaseGame;
import org.simplecorporation.myengine.core.input.InputManager;
import org.simplecorporation.myengine.utils.ScreenUtils;

import android.app.Activity;
import android.graphics.Paint;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class AndroidDisplay extends SurfaceView implements SurfaceHolder.Callback {

/* The android game */
public BaseGame androidGame;

/* The android game thread */
public AndroidGameThread androidGameThread;

/* The boolean that states whether this has been created */
public boolean created;

/* The constructor */
public AndroidDisplay(Activity gameActivity , BaseGame androidGame) {
    //Call the super constructor
    super(gameActivity);

    //Add the callback
    this.getHolder().addCallback(this);

    //Set the game activity in the AndroidStore
    AndroidStore.gameActivity = gameActivity;

    //Set the android game
    this.androidGame = androidGame;

    //Create the android game thread
    this.androidGameThread = new AndroidGameThread(this.getHolder(), this.androidGame, this);

    //Set created to false
    this.created = false;

    //Set the surface view focusable
    this.setFocusable(true);
}

/* Called when the surface is created */
public void surfaceCreated(SurfaceHolder surfaceHolder) {
    //Set created to true
    this.created = true;
    //Create the input
    InputManager.create();
    //Set the size of the screen in the settings if full screen
    if (Settings.Window.Fullscreen) {
        Settings.Window.Size.Width = ScreenUtils.getScreenWidth();
        Settings.Window.Size.Height = ScreenUtils.getScreenHeight();
    } else {
        //Set the size of the screen in the settings
        Settings.Window.Size.Width = this.getWidth();
        Settings.Window.Size.Height = this.getHeight();
    }
    //Set the game resources
    AndroidStore.gameResources = this.getResources();
    //Create the game
    this.androidGame.gameCreated();
    //Create the paint object
    AndroidStore.gamePaint = new Paint();
    //Start the android game thread if it has not already started
    this.androidGameThread.setRunning(true);
    if (! this.androidGameThread.isAlive())
        this.androidGameThread.start();
}

/* Called when the surface is changed */
public void surfaceChanged(SurfaceHolder surfaceHolder , int format , int width , int height) {
    //Set the size of the screen in the settings
    Settings.Window.Size.Width = ScreenUtils.getScreenWidth();
    Settings.Window.Size.Height = ScreenUtils.getScreenHeight();
    //Reassign the surface holder
    this.androidGameThread.surfaceHolder = surfaceHolder;
}

/* Called when the surface is destroyed */
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
    //Set created to false
    this.created = false;
}

/* The method used to stop the thread */
public void stopThread() {
    //Should the loop continue
    boolean retry = true;
    while(retry) {
        //Try and catch statement
        try {
            //Stop the game
            this.androidGame.gameStopped();
            //Close the game
            this.androidGame.gameClosing();
            //Join the thread
            this.androidGameThread.join();
            //Stop the while loop
            retry = false;
        } catch (InterruptedException e) {

        }
    }
}

}