title: Texture is not displayed in the application
body: <p>In the process of studying the framework libgdx I found a wonderful way to structure the project. And here's my example of loading a texture and displaying it.</p>
  
  <p>realizing Singleton pattern of AssetManager</p>
  
  <pre><code>public class GameAsssetManager extends AssetManager {
  
  private static GameAsssetManager instance;
  
  public static GameAsssetManager getInstance(){
      if(null == instance)
          instance = new GameAsssetManager();
  
  return instance;
  }
  
  public void init(){}
  }
  </code></pre>
  
  <p>loading the picture</p>
  
  <pre><code>    public class LoadScreen implements Screen{
  
  private void loadAssets(){
      GameAsssetManager.getInstance().load("badlogic.jpg",Texture.class);
  }
  
  @Override
  public void show() {
      GameAsssetManager.getInstance().init();
      loadAssets();
  }
  
  @Override
  public void render(float delta) {
      //Метод update возвращает true в том случаи, если все ресурсы загружены
      if(GameAsssetManager.getInstance().update()){
          ScreenManager.getInstance().show(CustomScreen.GAME);
      }
  }
  ...
  }
  </code></pre>
  
  <p>and finaly displaying the picture</p>
  
  <pre><code>public class GameScreen implements Screen {
  ...
  @Override
  public void show() {
      batch = new SpriteBatch();
      texture = GameAsssetManager.getInstance().get("badlogic.jpg");
  }
  @Override
  public void render(float delta) {
  Gdx.gl.glClearColor(0, 1, 0, 1);
      Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
      batch.begin();
      batch.draw(
              texture,
              Gdx.graphics.getWidth()/2 - texture.getWidth()/2,
              Gdx.graphics.getHeight()/2 - texture.getHeight()/2
      );
      batch.end();
  }
  ...
  </code></pre>
  
  <p>So the problem is the following. When the application is compiled everything works fine. But if you close the application and launch the installed application anew, in the place where there should be displayed texture is displayed black square.</p>