嘿大家我还在研究这个libgdx项目,我正在试图找出将屏幕更改为我的游戏画面的最佳方法现在,当点击一个按钮时,我需要它转换到游戏画面.我已经看到了一些扩展游戏类的实现,但我不确定这里最好的方法是什么.如果您看到一些可以改进的代码,请告诉我们.
这是主要的应用程序类：
public class ConnectFourApplication implements ApplicationListener {
private Screen screen;
public static void main(String[] args) {
new LwjglApplication(new ConnectFourApplication(),"PennyPop",1280,720,true);
}
@Override
public void create() {
screen = new MainScreen();
screen.show();
}
@Override
public void dispose() {
screen.hide();
screen.dispose();
}
/** Clears the screen with a white color */
private void clearWhite() {
Gdx.gl.glClearColor(1,1,1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
}
@Override
public void pause() {
screen.pause();
}
@Override
public void render() {
clearWhite();
screen.render(Gdx.graphics.getDeltaTime());
}
@Override
public void resize(int width,int height) {
screen.resize(width,height);
}
@Override
public void resume() {
screen.resume();
}
}
public class MainScreen implements Screen {
private final Stage stage;
private final SpriteBatch spriteBatch;
//Parameter for drawing the buttons
private final BitmapFont font;
private final TextureAtlas buttons;
private final Button SFXButton;
private final Button APIButton;
private final Button GameButton;
private final Skin images;
//Parameter for Sound
private final com.badlogic.gdx.audio.Sound SFXClick;
//Parameter for the api call
private final String WeatherUrl;
private final HttpRequest request;
private final City SanFrancisco;
//The screen to load after the game button is hit
private Screen gamescreen;
public MainScreen() {
//Set up our assets
spriteBatch = new SpriteBatch();
stage = new Stage(Gdx.graphics.getWidth(),Gdx.graphics.getHeight(),false,spriteBatch);
font = new BitmapFont(Gdx.files.internal("assets/font.fnt"),Gdx.files.internal("assets/font.png"),false);
buttons = new TextureAtlas("assets/GameButtons.pack");
images = new Skin(buttons);
images.addRegions(buttons);
SFXButton = new Button(images.getDrawable("sfxButton"));
SFXButton.setPosition(295,310);
APIButton = new Button(images.getDrawable("apiButton"));
APIButton.setPosition(405,310);
GameButton = new Button(images.getDrawable("gameButton"));
GameButton.setPosition(515,310);
SFXClick = Gdx.audio.newSound(Gdx.files.internal("assets/button_click.wav"));
//Add our actors to the stage
stage.addActor(SFXButton);
stage.addActor(APIButton);
stage.addActor(GameButton);
//Set up our Url request to be used when clicking the button
WeatherUrl = "http://api.openweathermap.org/data/2.5/weather?q=San%20Francisco,US";
request = new HttpRequest(HttpMethods.GET);
request.setUrl(WeatherUrl);
SanFrancisco = new City("Unavailable","Unavailable","0","0"); //init san fran to be displayed before they have clicked the button
//initialize the game screen that we will switch to when the button is pressed
gamescreen = new GameScreen();
}
@Override
public void dispose() {
spriteBatch.dispose();
stage.dispose();
}
@Override
public void render(float delta) {
stage.act(delta);
stage.draw();
//Begin sprite batch
spriteBatch.begin();
//Set our on click listeners for our buttons
if (SFXButton.isPressed())
SFXClick.play();
if(APIButton.isPressed())
{
CallApi();
}
if(GameButton.isPressed())
LoadGame();
//Set font color and render the screen
font.setColor(Color.RED);
font.draw(spriteBatch,455 - font.getBounds("PennpyPop").width/2,460 + font.getBounds("PennyPop").height/2);
font.setColor(Color.BLACK);
font.draw(spriteBatch,"Current Weather",900 - font.getBounds("PennpyPop").width/2,460 + font.getBounds("PennyPop").height/2);
font.setColor(Color.LIGHT_GRAY);
font.draw(spriteBatch,SanFrancisco.Name,940 - font.getBounds("PennpyPop").width/2,420 + font.getBounds("PennyPop").height/2);
font.setColor(Color.RED);
font.draw(spriteBatch,SanFrancisco.CurrentCondition,950 - font.getBounds("PennpyPop").width/2,300 + font.getBounds("PennyPop").height/2);
font.draw(spriteBatch,SanFrancisco.Temperature + " Degrees,",920 - font.getBounds("PennpyPop").width/2,270 + font.getBounds("PennyPop").height/2);
font.draw(spriteBatch,SanFrancisco.WindSpeed,1200 - font.getBounds("PennpyPop").width/2,270 + font.getBounds("PennyPop").height/2);
//End or sprite batch
spriteBatch.end();
}
//Handles calling our API
public void CallApi(){
//Sends our stored HTTPRequest object
Gdx.net.sendHttpRequest(request,new HttpResponseListener() {
@Override
public void handleHttpResponse(HttpResponse httpResponse) {
//Uses our private response reader object to give us a the JSON from the api call
JSONObject json = HttpResponseReader(httpResponse);
//Gets the name of the city
SanFrancisco.Name = (String) json.get("name");
//Parsed through our returned JSON for the weather key
JSONArray WeatherArray = (JSONArray) json.get("weather");
//Gets the actual weather dictionary
JSONObject Weather = (JSONObject) WeatherArray.get(0);
//Finally get the value with the key of description and assign it
//To the San Fran current conditions field
SanFrancisco.CurrentCondition = (String) Weather.get("description");
//Gets the actual main dictionary
JSONObject main = (JSONObject) json.get("main");
//Finally get the values based on the keys
SanFrancisco.Temperature = (String) Double.toString((double) main.get("temp"));
//Finally get the wind speed
JSONObject wind = (JSONObject) json.get("wind");
SanFrancisco.WindSpeed = (String) Double.toString((double) wind.get("speed"));
}
@Override
public void Failed(Throwable t) {
Gdx.app.log("Failed ",t.getMessage());
}
});
}
//When the button game button is clicked should load the connect four game
public void LoadGame(){
hide();
gamescreen.show();
}
//Converts our HttpResponse into a JSON OBject
private static JSONObject HttpResponseReader(HttpResponse httpResponse){
BufferedReader read = new BufferedReader(new InputStreamReader(httpResponse.getResultAsStream()));
StringBuffer result = new StringBuffer();
String line = "";
try {
while ((line = read.readLine()) != null) {
result.append(line);
}
JSONObject json;
try {
json = (JSONObject)new JSONParser().parse(result.toString());
return json;
} catch (ParseException e) {
e.printStackTrace();
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
public void resize(int width,int height) {
stage.setViewport(width,height,false);
}
@Override
public void hide() {
Gdx.input.setInputProcessor(null);
}
@Override
public void show() {
Gdx.input.setInputProcessor(stage);
render(0);
}
@Override
public void pause() {
// Irrelevant on desktop,ignore this
}
@Override
public void resume() {
// Irrelevant on desktop,ignore this
}
}
解决方法
这就是我总是实现屏幕切换的方式：
首先,主类需要扩展Game(来自com.badlogic.gdx.Game),你需要有一个类型为Game的新字段：
public class ConnectFourApplication extends Game{
private Game game;
现在在构造函数中初始化游戏：
public ConnectFourApplication(){
game = this; // Since this class extends Game
现在,要将屏幕设置为MainScreen,您需要做的就是使用setScreen(new MainScreen(game));方法(传递游戏,所以我们可以从MainScreen类设置屏幕)
您现在需要一个MainScreen类的新构造函数和一个新字段：
private Game game;
public MainScreen(Game game){
this.game = game;
现在你可以使用game.setScreen(新屏幕(游戏));将屏幕设置为另一个实现Screen的类.
但是现在,在main类中,在render()方法中你必须使用super.render();使用其他屏幕渲染的一切！
public void render() {
clearWhite();
super.render();
}
PS：确保您作为屏幕制作的课程实际上实现了Screen.
