package utm.csc492.diamondfire;

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Game;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Screen;

import utm.csc492.diamondfire.screens.CityScreen;


public class DiamondFire extends ApplicationAdapter {

    private Screen screen;

	@Override
	public void create () {
        setScreen(new CityScreen(this));
	}

	@Override
	public void render () {
        if (screen != null) screen.render(Gdx.graphics.getDeltaTime());
    }

    /** use to set current screen **/
    public void setScreen (Screen screen) {
        if (this.screen != null) this.screen.hide();
        this.screen = screen;
        if (this.screen != null) {
            this.screen.show();
            this.screen.resize(Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
        }
    }

    /** return currently active screen **/
    public Screen getScreen () {
        return screen;
    }
}


package utm.csc492.diamondfire;

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Game;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Screen;
//import com.badlogic.gdx.graphics.GL10;
//import com.badlogic.gdx.graphics.Texture;
//import com.badlogic.gdx.graphics.g2d.SpriteBatch;

import utm.csc492.diamondfire.screens.CityScreen;
import utm.csc492.diamondfire.screens.Test;


public class DiamondFire extends ApplicationAdapter {

    private Screen screen;


	//SpriteBatch batch;
	//Texture img;
	
	@Override
	public void create () {
		//batch = new SpriteBatch();
		//img = new Texture("badlogic.jpg");
//		try {
//			new FreeTypeFontGenerator(Gdx.files.internal("test.fnt"));
//		} catch(Exception e) {
//			e.printStackTrace();
//		}
//		Bullet.init();

        setScreen(new CityScreen(this));
	}

	@Override
	public void render () {
		/*
		Gdx.gl.glClearColor(1, 0, 0, 1);
		Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
		batch.begin();
		batch.draw(img, 0, 0);
		batch.end();
		*/

        if (screen != null) screen.render(Gdx.graphics.getDeltaTime());
    }

    /** use to set current screen **/
    public void setScreen (Screen screen) {
        if (this.screen != null) this.screen.hide();
        this.screen = screen;
        if (this.screen != null) {
            this.screen.show();
            this.screen.resize(Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
        }
    }

    /** return currently active screen **/
    public Screen getScreen () {
        return screen;
    }
}

--- 
+++ 
@@ -1,50 +1,24 @@
-
 package utm.csc492.diamondfire;
 
 import com.badlogic.gdx.ApplicationAdapter;
 import com.badlogic.gdx.Game;
 import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.Screen;
-//import com.badlogic.gdx.graphics.GL10;
-//import com.badlogic.gdx.graphics.Texture;
-//import com.badlogic.gdx.graphics.g2d.SpriteBatch;
 
 import utm.csc492.diamondfire.screens.CityScreen;
-import utm.csc492.diamondfire.screens.Test;
 
 
 public class DiamondFire extends ApplicationAdapter {
 
     private Screen screen;
 
-
-	//SpriteBatch batch;
-	//Texture img;
-	
 	@Override
 	public void create () {
-		//batch = new SpriteBatch();
-		//img = new Texture("badlogic.jpg");
-//		try {
-//			new FreeTypeFontGenerator(Gdx.files.internal("test.fnt"));
-//		} catch(Exception e) {
-//			e.printStackTrace();
-//		}
-//		Bullet.init();
-
         setScreen(new CityScreen(this));
 	}
 
 	@Override
 	public void render () {
-		/*
-		Gdx.gl.glClearColor(1, 0, 0, 1);
-		Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
-		batch.begin();
-		batch.draw(img, 0, 0);
-		batch.end();
-		*/
-
         if (screen != null) screen.render(Gdx.graphics.getDeltaTime());
     }
 
Remove some commented out code.
