Resolución de pantalla con LibGDX

package com.bolivia.libgdxresolution;
/**
 * @author mouse
 * @web https://www.jc-mouse.net
 * 
 * Clase que redimensiona el ancho y alto del juego para que este encaje en la pantalla
 * del celular sin deformarse 
 * */
public final class RPantalla {

 //portrait
 private float anchop;
 private float altop;
 //landscape
 private float anchol;
 private float altol;
 //Coordenas X,Y para las diferentes vistas
 //portrait
 private float xp=0f;
 private float yp=0f;
 //landscape
 private float xl=0f;
 private float yl=0f;
 //Posicion de vista por defecto
 private String posicion="portrait" ;

 /**
 * Constructor de clase
 * @param game_ancho Ancho del juego
 * @param game_alto Alto del juego
 * @param screen_ancho Ancho de la pantalla del celular
 * @param screen_alto Alto de la pantalla del celular
 * */
 public RPantalla( float game_ancho, float game_alto ,float screen_ancho, float screen_alto  )
 {
   /* Portrait
 |--------|
 | |
 | |
 | |
 | |
 y |
 |x-------|
 */
   //posicion
   xp = 0f;
   yp = (screen_alto - game_alto*(screen_ancho/game_ancho))/2f;
   //tamaño
   anchop =  game_ancho*(screen_ancho/game_ancho);
   altop = game_alto*(screen_ancho/game_ancho); 

   /* Lanscape
 |-------------------|
 | |
 | |
 y |
 |x------------------|
 */
   //posicion
   xl= ( screen_ancho - game_ancho*(screen_alto/game_alto))/2f;
   yl = 0f;   
   //tamaño
   anchol = game_ancho*(screen_alto/game_alto);
   altol = game_alto*(screen_alto/game_alto);

 }

 /**
 * Segun las dimensiones de la pantalla asigna la posicion en portrait o landscape
 * @param width Ancho de pantalla
 * @param height Alto de pantalla
 * */
 public void setPosicion( int width, int height )
 {  
  this.posicion = ( width > height )?"landscape":"portrait" ;
 }

 public int getX()
 {
  return ( posicion.equals("landscape"))?(int)xl:(int)xp;
 }

 public int getY()
 {
  return ( posicion.equals("landscape"))?(int)yl:(int)yp;
 }

 public int getAncho()
 {

  return ( posicion.equals("landscape"))?(int)anchol:(int)anchop;
 }

 public int getAlto()
 {
  return ( posicion.equals("landscape"))?(int)altol:(int)altop;
 }

}

package com.bolivia.libgdxresolution;

import com.badlogic.gdx.ApplicationListener;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.g2d.TextureRegion;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer.ShapeType;
/**
 * @author mouse
 * @web https://www.jc-mouse.net
 * */
public class Evangelion implements ApplicationListener{

 private TextureRegion asuka;
 private TextureRegion rei;
 private SpriteBatch batch;
 private OrthographicCamera camera; 
 private Sprite  eva01;
 private ShapeRenderer shapeRenderer;
 //dimensiones del juego
 private float game_ancho = 800;
 private float game_alto = 480;

 private RPantalla rpantalla;

 @Override
 public void create() {

  //----- TEXTURE REGION ------
  //Textura completa asuka y rei
  Texture asukarei = new Texture( Gdx.files.internal("asukarei.jpg") );
  //extrae una region de la imagen
  asuka = new TextureRegion( asukarei , 120, 50, 118, 164 );
  rei = new TextureRegion( asukarei , 32, 43, 88, 166 );
  //------SPRITE--------------
  Texture robot = new Texture( Gdx.files.internal("eva01.png") );
  eva01 = new Sprite( robot );
  eva01.rotate(45);
  eva01.setPosition(400, 100);
  eva01.setScale(2);

  batch = new SpriteBatch();  
  shapeRenderer = new ShapeRenderer();

  //Se crea el Viewport
  camera = new OrthographicCamera();
  camera.setToOrtho(false, game_ancho,game_alto);
  //Instancia a nueva clase RPantalla con las dimensiones del juego y de la pantalla del celular
  rpantalla = new RPantalla( game_ancho , game_alto, Gdx.graphics.getWidth() , Gdx.graphics.getHeight());
 }

 @Override
 public void dispose() {
  //liberamos memoria
  asuka.getTexture().dispose();
  rei.getTexture().dispose();  
  batch.dispose();  
 }

 @Override
 public void pause() { /* ... */ }

 @Override
 public void render() {
  Gdx.gl.glClearColor( 1, 0, 0.5f, 1);
  Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);

  //Dibuja un rectangulo 
  shapeRenderer.setProjectionMatrix( camera.combined );
  shapeRenderer.begin( ShapeType.Filled );
  shapeRenderer.setColor(0, 1, 0, 1); 
  shapeRenderer.rect(0, 0, game_ancho, game_alto );  
  shapeRenderer.end();

  // dibuja las imagenes
  batch.setProjectionMatrix( camera.combined );
  batch.begin();
  batch.draw(rei,100,200,88,166);
  batch.draw(asuka,0,0,118,164);
  eva01.draw( batch );
  batch.end();
 }

 @Override
 public void resize(int width, int height) {
  //cuando se cambie de tamaño se redimensionara el juego
  this.rpantalla.setPosicion(width, height);
  Gdx.gl.glViewport( this.rpantalla.getX(), this.rpantalla.getY(), this.rpantalla.getAncho(), this.rpantalla.getAlto() );
 }

 @Override
 public void resume() { /* ... */ }
}

package com.bolivia.libgdxresolution;

import com.badlogic.gdx.backends.android.AndroidApplication;
import android.os.Bundle;

public class MainActivity  extends AndroidApplication{

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  initialize( new Evangelion(), false );
 }

}