如何通過點擊libgdx上的按鈕來打開另一個類？ （android開發eclipse）

Question

我正在做我自己的遊戲。我已經做了一個啓動畫面和一個主菜單。我在菜單中製作了一個按鈕「播放」，但我無法將其鏈接到我的主遊戲，而我可以將它鏈接到其他課程。

這裏是類的代碼，我無法打開：

package com.mygdx.Papermadness.screens; 

import com.badlogic.gdx.ApplicationListener; 
import com.badlogic.gdx.Gdx; 
import com.badlogic.gdx.InputAdapter; 
import com.badlogic.gdx.Preferences; 
import com.badlogic.gdx.Screen; 
import com.badlogic.gdx.graphics.Color; 
import com.badlogic.gdx.graphics.Texture; 
import com.badlogic.gdx.graphics.Texture.TextureWrap; 
import com.badlogic.gdx.graphics.g2d.BitmapFont; 
import com.badlogic.gdx.graphics.g2d.Sprite; 
import com.badlogic.gdx.graphics.g2d.SpriteBatch; 
import com.badlogic.gdx.graphics.glutils.ShapeRenderer; 
import com.badlogic.gdx.math.Vector2; 

public class PaperMadness extends InputAdapter implements ApplicationListener, Screen  { 



float timer; 
    public static Preferences prefs; 
    public static int counter; // The variable you want to save 

    private BitmapFont font; 
    //public int counter = 0; 
    boolean touch = false; 

    SpriteBatch batch; 

    SpriteBatch spriteBatch; 
    Texture spriteTexture; 
    Sprite sprite; 

    float scrollTimer = 0.0f; 

    Player player; 
    Paper paper; 

    Huiz huiz; 

    Lijn lijn; 

    String money = String.valueOf(counter); 

    ShapeRenderer sr; 

    public boolean kukar = false; 


    public void create() { 

     font = new BitmapFont(); 
     Gdx.input.setInputProcessor(this); 

     player = new Player(new Vector2(50, 100), new Vector2(100, 100)); 
     huiz = new Huiz(new Vector2(200, 300), new Vector2(110, 110)); 
     // huiz = new Huiz(new Vector2(200, 300), new Vector2(110, 110)); 
     paper = new Paper(new Vector2(Gdx.input.getX(), 
       Gdx.graphics.getHeight() - Gdx.input.getY()), new  Vector2(50, 
       50)); 
     lijn = new Lijn(new Vector2(0, 200), new Vector2(600, 2)); 
     // sr = new ShapeRenderer(); 

     spriteBatch = new SpriteBatch(); 

     spriteTexture = new Texture("b9.png"); 
     spriteTexture.setWrap(TextureWrap.Repeat, TextureWrap.Repeat); 
     sprite = new Sprite(spriteTexture); 
     sprite.setSize(Gdx.graphics.getWidth(), Gdx.graphics.getHeight()); 
     batch = new SpriteBatch(); 

    } 
    @Override 
    public void render(float delta) { 
     // bounds.set(Gdx.input.getX(), 
       // Gdx.graphics.getHeight() - Gdx.input.getY(), 
       // secondTexture.getWidth(), secondTexture.getHeight()); 

       scrollTimer += Gdx.graphics.getDeltaTime(); 
       if (scrollTimer > 1.0f) 
        scrollTimer = 0.0f; 

       sprite.setV(scrollTimer + 2); 
       sprite.setV2(scrollTimer); 

       player.update(); 
       paper.update(); 
       lijn.update(); 
       huiz.update(); 

       /* 
       * if (tree.getBounds().overlaps(ball.getBounds())) { 
       * System.out.println("Swendley Programinateur"); } 
       * 
       * if (tree.getBounds().overlaps(paper.getBounds())) { 
       * System.out.println("Souk Programinateur"); } 
       */ 

       spriteBatch.begin(); 
       sprite.draw(spriteBatch); 
       spriteBatch.end(); 

       batch.begin(); 
       player.draw(batch); 
       huiz.draw(batch); 
       // paper.draw(batch); 
       if (Gdx.graphics.getHeight()/1.25 < Gdx.input.getY() 
         && Gdx.graphics.getWidth()/2.7 < Gdx.input.getX() 
         && Gdx.graphics.getWidth()/1.7 > Gdx.input.getX() 
         && Gdx.input.isTouched() && kukar == false && touch == false) { 
        kukar = true; 
        touch = true; 
       } else if (Gdx.input.isTouched() && kukar == true && touch == true) { 
        paper.draw(batch); 

        if (paper.getBounds().overlaps(huiz.getBounds()) 
          || paper.getBounds().overlaps(huiz.getBounds1())) { 
         // System.out.println("Huis Geraakt!"); 
         touch = false; 
         counter++; 
         checkSpeed(); 
         money = Integer.toString(counter); 

         // System.out.println(counter); 
        } 
       } 

       if (huiz.getBounds().overlaps(lijn.getBounds()) 
         || huiz.getBounds1().overlaps(lijn.getBounds())){ 
        //System.out.println("Game Over"); 
       } 

        font.draw(batch, money, Gdx.graphics.getWidth()/2.06f, 
          Gdx.graphics.getHeight()/1.05f); 
       font.setColor(Color.BLACK); 
       font.setScale(2, 2); 
       // house.draw(batch); 
       // house1.draw(batch); 
       lijn.draw(batch); 

       batch.end(); 

       // sr.begin(ShapeType.Filled); 
       // sr.setColor(Color.YELLOW); 
       // sr.rect(Gdx.input.getX(), Gdx.graphics.getHeight() - 
       // Gdx.input.getY(), 
       // paper.getSize().x, paper.getSize().y); 
       // sr.setColor(Color.BLACK); 
       // sr.rect(huiz.getPosition().x, huiz.getPosition().y, 
       // huiz.getSize().x, huiz.getSize().y); 
       // sr.rect(house1.getPosition().x, house1.getPosition().y, 
       // house1.getSize().x, house1.getSize().y); 
       // sr.end(); 

      } 
      public static void savePrefs(){ 
       prefs = Gdx.app.getPreferences("game-prefs"); // The name of your prefs files 
       prefs.putInteger("counter", counter); 
       prefs.flush(); 
       System.out.println(prefs); 
      } 

      public static void loadPrefs(){ 

       prefs = Gdx.app.getPreferences("game-prefs"); 
       counter = prefs.getInteger("counter",0); //Load counter, default to zero if not found 

      } 
      public void checkSpeed() { 
       if (counter <= 7) { 
        huiz.huisVelocity = 500f; 
       } 
       if (counter > 7 && counter <= 17) { 
        huiz.huisVelocity = 550f; 
       } 
       if (counter > 17 && counter <= 30) { 
        huiz.huisVelocity = 650f; 
       } 
       if (counter > 30 && counter <= 50) { 
        huiz.huisVelocity = 750; 
       } 
       if (counter > 50 && counter <= 75) { 
        huiz.huisVelocity = 900; 
       } 
       if (counter > 75 && counter <= 100) { 
        huiz.huisVelocity = 1000; 
       } 

      } 
      @Override 
      public boolean touchUp(int screenX, int screenY, int pointer, int button) { 
       kukar = false; 
       touch = false; 
       return true; 
      } 



    @Override 
    public void resize(int width, int height) { 

    } 

    @Override 
    public void show() { 

    } 

    @Override 
    public void hide() { 

    } 

    @Override 
    public void pause() { 

    } 

    @Override 
    public void resume() { 

    } 

    @Override 
    public void dispose() { 

    } 
    @Override 
    public void render() { 

    } 
} 

這是菜單類：

package com.mygdx.Papermadness.screens; 

import com.badlogic.gdx.Game; 
import com.badlogic.gdx.Gdx; 
import com.badlogic.gdx.Screen; 
import com.badlogic.gdx.graphics.Color; 
import com.badlogic.gdx.graphics.GL20; 
import com.badlogic.gdx.graphics.g2d.BitmapFont; 
import com.badlogic.gdx.graphics.g2d.TextureAtlas; 
import com.badlogic.gdx.scenes.scene2d.InputEvent; 
import com.badlogic.gdx.scenes.scene2d.Stage; 
import com.badlogic.gdx.scenes.scene2d.ui.Label; 
import com.badlogic.gdx.scenes.scene2d.ui.Label.LabelStyle; 
import com.badlogic.gdx.scenes.scene2d.ui.Skin; 
import com.badlogic.gdx.scenes.scene2d.ui.Table; 
import com.badlogic.gdx.scenes.scene2d.ui.TextButton; 
import com.badlogic.gdx.scenes.scene2d.ui.TextButton.TextButtonStyle; 
import com.badlogic.gdx.scenes.scene2d.utils.ClickListener; 
import com.mygdx.Papermadness.Papermadness; 

public class MainMenu implements Screen { 

    private Stage stage;// done 
    private TextureAtlas atlas;// done 
    private Skin skin;// done 
    private Table table;// done 
    private TextButton buttonPlay, buttonExit; 
    private BitmapFont white, black;// done 
    private Label heading; 

    @Override 
    public void render(float delta) { 
     Gdx.gl.glClearColor(0, 0, 0, 1); 
     Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); 

     Table.drawDebug(stage); 

     stage.act(delta); 
     stage.draw(); 

    } 

    @Override 
    public void resize(int width, int height) { 


    } 

    @Override 
    public void show() { 
     stage = new Stage(); 

     Gdx.input.setInputProcessor(stage); 

     atlas = new TextureAtlas("ui/button.pack"); 
     skin = new Skin(atlas); 

     table = new Table(skin); 
     table.setBounds(0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight()); 

     white = new BitmapFont(Gdx.files.internal("font/white.fnt"), false); 
     black = new BitmapFont(Gdx.files.internal("font/black.fnt"), false); 

     // maakt buttons 
     TextButtonStyle textButtonStyle = new TextButtonStyle(); 
     textButtonStyle.up = skin.getDrawable("button.up"); 
     textButtonStyle.down = skin.getDrawable("button.down"); 
     textButtonStyle.pressedOffsetX = 1; 
     textButtonStyle.pressedOffsetY = -1; 
     textButtonStyle.font = black; 

     buttonExit = new TextButton("EXIT", textButtonStyle); 
     buttonExit.addListener(new ClickListener() { 
      @Override 
      public void clicked(InputEvent event, float x, float y) { 
       Gdx.app.exit(); 
      } 
     }); 

     buttonExit.pad(15); 

     buttonPlay = new TextButton("PlAY", textButtonStyle); 
     buttonPlay.addListener(new ClickListener() { 
      @Override 
      public void clicked(InputEvent event, float x, float y) { 
       ((Game) Gdx.app.getApplicationListener()) 
         .setScreen(new PaperMadness()); 
      } 

     }); 
     buttonPlay.pad(15); 

     // maakt header 
     heading = new Label(Papermadness.TITLE, new LabelStyle(white, 
       Color.WHITE)); 
     heading.setFontScale(2); 

     table.add(heading); 
     table.getCell(heading).spaceBottom(100); 
     table.row(); 
     table.add(buttonPlay); 
     table.getCell(buttonPlay).spaceBottom(15); 
     table.row(); 
     table.add(buttonExit); 
     // table.debug(); 
     stage.addActor(table); 

    } 

    @Override 
    public void hide() { 

    } 

    @Override 
    public void pause() { 

    } 

    @Override 
    public void resume() { 

    } 

    @Override 
    public void dispose() { 
     stage.dispose(); 
     atlas.dispose(); 
     skin.dispose(); 
     white.dispose(); 
     black.dispose(); 

    } 
} 

Answer 1

public class MyGdxGame extends Game{ 
     public static MenuScreen menuScreen; 
     public static GameScreen gameScreen; 

     @Override  
     public void create(){ 
     menuScreen = new MenuScreen(this); 
     gameScreen = new GameScreen (this); 
     setScreen(menuScreen); 
    } 
} 

這裏是MenuScreen

public class MenuScreen implements Screen{ 
    MyGdxGame game; 

    public MenuScreen(MyGdxGame game){ 
     this.game = game; 
    } 
    ////////////when you want to change screen type game.setScreen(game.gameScreen) 
    ........... 
    ........... 
} 

這是GameScreen

public class GameScreen implements Screen{ 
    ........... 
    ........... 
    ........... 
} 

這是一個簡單的例子，試着在你的代碼中做同樣的事情。
這是一個很好的教程 https://github.com/libgdx/libgdx/wiki/Extending-the-simple-game 如果它有幫助，讓我知道它。