我试图在这个游戏中重新创造障碍我几乎要完成创作，但是，Android Studio抱怨了一系列新的错误：
Error:(133, 4) Gradle: error: illegal start of expression
Error:(133, 12) Gradle: error: illegal start of expression
Error:(133, 28) Gradle: error: ';' expected
Error:(136, 19) Gradle: error: ';' expected
Error:(170, 22) Gradle: error: ';' expected
Error:(170, 34) Gradle: error: ';' expected
Error:(184, 23) Gradle: error: ';' expected
Error:(188, 1) Gradle: error: reached end of file while parsing
我应该创建一个SpawnEntity类吗？这是我的MainGame类的代码：
package com.circlecrashavoider;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.physics.box2d.Contact;
import com.badlogic.gdx.physics.box2d.ContactImpulse;
import com.badlogic.gdx.physics.box2d.ContactListener;
import com.badlogic.gdx.physics.box2d.Manifold;
import com.badlogic.gdx.physics.box2d.World;
import com.badlogic.gdx.scenes.scene2d.Stage;
import com.badlogic.gdx.utils.viewport.FitViewport;
import com.circlecrashavoider.entities.FloorEntity;
import com.circlecrashavoider.entities.ObstacleEntity;
import com.circlecrashavoider.entities.ObstacleEntity2;
import com.circlecrashavoider.entities.PlayerEntity;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.Random;
/**
* Created by Felipe on 2/22/2016.
*/
public class GameScreen extends BaseScreen {
private Stage stage;
private World world;
private PlayerEntity player;
private List<FloorEntity> floorList = new ArrayList<FloorEntity>();
private List<ObstacleEntity> obstacleList = new ArrayList<ObstacleEntity>();
private List<ObstacleEntity2> obstacle2List = new ArrayList<ObstacleEntity2>();
public GameScreen(MainGame game) {
super(game);
stage = new Stage(new FitViewport(1024, 620));
world = new World(new Vector2(0, -10), true);
world.setContactListener(new ContactListener() {
private boolean areCollided(Contact contact, Object userA, Object userB) {
return (contact.getFixtureA().getUserData().equals(userA) && contact.getFixtureB().getUserData().equals(userB)) ||
(contact.getFixtureA().getUserData().equals(userB) && contact.getFixtureB().getUserData().equals(userA));
}
@Override
public void beginContact(Contact contact) {
if (areCollided(contact, "player", "floor")) {
player.setJumping(false);
if (Gdx.input.isTouched()) {
player.setMustJump(true);
}
}
if (areCollided(contact, "player", "obstacle")) {
player.setAlive(false);
System.out.println("GAME OVER");
}
if (areCollided(contact, "player", "obstacle2")) {
player.setAlive(false);
System.out.println("GAME OVER");
}
}
@Override
public void endContact(Contact contact) {
}
@Override
public void preSolve(Contact contact, Manifold oldManifold) {
}
@Override
public void postSolve(Contact contact, ContactImpulse impulse) {
}
});
}
@Override
public void show() {
Texture playerTexture = game.getManager().get("player.png");
Texture floorTexture = game.getManager().get("floor.png");
Texture overfloorTexture = game.getManager().get("overfloor.png");
Texture overfloor2Texture = game.getManager().get("overfloor2.png");
Texture obstacleTexture = game.getManager().get("obstacle.png");
Texture obstacle2Texture = game.getManager().get("obstacle2.png");
player = new PlayerEntity(world, playerTexture, new Vector2(1, 2));
for (FloorEntity floor : floorList) {
stage.addActor(floor);
}
for (ObstacleEntity obstacle : obstacleList) {
stage.addActor(obstacle);
stage.addActor(player);
}
for (ObstacleEntity2 obstacle2 : obstacle2List) {
stage.addActor(obstacle2);
}
}
public void update(float deltaTime) {
Texture playerTexture = game.getManager().get("player.png");
Texture floorTexture = game.getManager().get("floor.png");
Texture overfloorTexture = game.getManager().get("overfloor.png");
Texture overfloor2Texture = game.getManager().get("overfloor2.png");
Texture obstacleTexture = game.getManager().get("obstacle.png");
Texture obstacle2Texture = game.getManager().get("obstacle2.png");
float timer = 0;
float spawnTime = 4f;
private void spawnEntity();
{
//Increment timer by the duration since the previous frame
float timer += Gdx.graphics.getRawDeltaTime();
//Compare to spawntime
if (timer >= (float) spawnTime)
{
//Spawn your object
floorList.add(new FloorEntity(world, floorTexture, overfloorTexture,overfloor2Texture, 0, 1000, 1));
floorList.add(new FloorEntity(world, floorTexture, overfloorTexture,overfloor2Texture ,8, 10 ,5));
floorList.add(new FloorEntity(world, floorTexture, overfloorTexture,overfloor2Texture ,10, 10 ,8));
floorList.add(new FloorEntity(world, floorTexture, overfloorTexture,overfloor2Texture ,34 , 3 ,5));
floorList.add(new FloorEntity(world, floorTexture, overfloorTexture,overfloor2Texture ,19 , 8 ,4));
floorList.add(new FloorEntity(world, floorTexture, overfloorTexture,overfloor2Texture ,24 , 8 ,1.5f));
floorList.add(new FloorEntity(world, floorTexture, overfloorTexture,overfloor2Texture ,27 , 5 , 2));
obstacleList.add(new ObstacleEntity(world, floorTexture, overfloorTexture, overfloor2Texture ,25, 10 ,20));
//But you will probably want to spawn something on the right, just outside of your screen view.
//This is the right side of your vp in the world. Depending how you draw you can add some more to it.
float spawnX = camera.position.x + camera.viewportWidth / 2;
//Then use this to spawn your object, since you hardcoded stuff I have no idea where to put it.
//Now reset timer
timer-= spawnTime;
//And perhaps randomize the spawnTime? (between 2 and 4 seconds)
Random random;
spawnTime = random.nextFloat() * 2 + 2;
}
}
@Override
public void render(float delta) {
Gdx.gl20.glClearColor(0.5f, 0.6f, 1, 3f);
Gdx.gl20.glClear(GL20.GL_COLOR_BUFFER_BIT);
stage.act();
world.step(delta, 6 ,2);
stage.draw();
}
@Override
public void dispose() {
stage.dispose();
world.dispose();
}
}
我没有SpawnEntity类，我应该创建它吗？我该怎么做才能解决这个问题？请帮助我!!
答案 0 :(得分：0)
您的代码存在许多问题。
首先，由于你没有关闭更新功能，你会收到错误，你不能把一个函数放在另一个函数中，但你可以从另一个函数中调用一个函数，如下所示： / p>
public void update(float deltaTime) {
spawnEntity();
}
将发生的另一个错误是您从未创建过Random对象，因此从中调用方法将导致 NullPointerException 。为避免这种情况，您需要在某处实例化Random对象：
Random random = new Random();
// ...
spawnTime = random.nextFloat() * 2f + 2f;
请注意，出于性能原因，最好不要在更新循环中实例化它，因为它每秒调用多次。
您也可以简单地使用LibGDX的方法来实现相同的结果：
spawnTime = MathUtils.random(2f, 4f);
另一个错误是您的FloorList永远不会添加任何楼层实体，因为您总是将计时器重置为更新方法中的 ，因此它们很可能永远不会达到4.正确的方法是将spawnTime设置为属性（使用您的舞台，世界和玩家）。
固定代码可能如下所示：
import com.badlogic.gdx.math.MathUtils;
// ... define your class ...
private float spawnTime = 4f;
private float timer = 0;
// ...
public void update(float deltaTime) {
// Increment timer by the duration since the previous frame
timer += deltaTime;
if (timer >= spawnTime) {
this.spawnEntity();
// the next spawn time will be triggered between 2 and 4 seconds :
spawnTime = MathUtils.random(2f, 4f);
timer = 0;
}
}
private void spawnEntity() {
Texture floorTexture = game.getManager().get("floor.png");
Texture overfloorTexture = game.getManager().get("overfloor.png");
Texture overfloor2Texture = game.getManager().get("overfloor2.png");
//Spawn your object
floorList.add(new FloorEntity(world, floorTexture, overfloorTexture,overfloor2Texture, 0, 1000, 1));
floorList.add(new FloorEntity(world, floorTexture, overfloorTexture,overfloor2Texture, 8, 10, 5));
floorList.add(new FloorEntity(world, floorTexture, overfloorTexture,overfloor2Texture, 10, 10, 8));
floorList.add(new FloorEntity(world, floorTexture, overfloorTexture,overfloor2Texture, 34, 3, 5));
floorList.add(new FloorEntity(world, floorTexture, overfloorTexture,overfloor2Texture, 19, 8, 4));
floorList.add(new FloorEntity(world, floorTexture, overfloorTexture,overfloor2Texture, 24, 8, 1.5f));
floorList.add(new FloorEntity(world, floorTexture, overfloorTexture,overfloor2Texture, 27, 5, 2));
obstacleList.add(new ObstacleEntity(world, floorTexture, overfloorTexture, overfloor2Texture, 25, 10 ,20));
}
至于您的类创建问题，您可以根据需要创建一个SpawnEntity类，但如您所见，它不是必需的：这取决于您以及您希望如何管理代码。但这当然是一个明智的选择，因为在代码增长时管理所有内容会更容易。