如何修復java.lang.UnsatisfiedLinkError：com.badlogic.gdx.physics.box2d.PolygonShape.newPolygonShape（）？

Question

出於某種原因，我的Box2d對象代碼在一個類中工作，但在另一個類中不起作用，即使它是完全相同的代碼我已經讀過它與導入正確的庫有關但是庫正確導入但仍然，它不管用。 我有點絕望，不知道該怎么做，說實話，也許有人可以給我一個指針。 我知道這是很多代碼，但我真的不知道該怎么做，我希望有人可以給我一個指針，也許我只是在忽略一些東西

這是帶有Object的代碼：

public class Tank extends Sprite implements Renderable, PhysicsObject, Updatable {
public Body body;
public Sprite SpriteBody;
public Sprite SpriteTurret;
public Playscreen playScreen;
public InputProvider input;
public Vector2 aim;
public int readytoshoot=0;
public float canonrotation;
public World world;
public Body b2Body;
TextureRegion TankBlues;
SpriteBatch sb;
public Texture texture;
public Texture arm;
Sprite sprite;
Sprite sparm;
int horizontalForce;
float dt;
float Richtung;
float Speed = 2f;
public float Radius;
private TankType type;
public ArrayList<Flower> flowers;
float PosX,PosY;
Body TankBody,CanonBody;
RevoluteJoint joint;
private Map<ControlSpecification, Integer> controlMap;
private boolean useController;

private int currentLife;
private int maxLife;
private int fullLifeWidth;

// Playscreen playscreen, Vector2 aim, Input Inputprovider,
public Tank(World world, Playscreen screen, SurvivalMode2 survivalMode, TankType tankType) {
    flowers = new ArrayList<Flower>();
    // super(screen.getAtlas().findRegion("tankBody_blue"));
    this.world = world;
    canonrotation=0;
    // TankBlues = new TextureRegion(getTexture(),0,0 , 46,46);
    // setBounds(0, 0, 46 / SEPGame.PPM, 46 / SEPGame.PPM);
    // setRegion(TankBlues);
    sb = new SpriteBatch();
    texture = new Texture(Gdx.files.internal("tankBody_.png"));

    arm = new Texture(Gdx.files.internal("b-tankBlue_barrel2_outline.png"));

    sprite = new Sprite(texture);

    sparm = new Sprite(arm);
    PosX=Gdx.graphics.getWidth() / 2 ;
    PosY= Gdx.graphics.getHeight() / 2;
    sprite.setPosition(PosX,PosY);
    sparm.setPosition(Gdx.graphics.getWidth() / 2 - sprite.getWidth() / 2, Gdx.graphics.getHeight() / 2);

    useController = false;
    // defineTank();
    // registerController();
    controlMap = StandardControlSpecification.getMapping(tankType);

    this.type = tankType;
    // defineTank();
    // registerController();

    // TankBody erstellen
    BodyDef bodyDef = new BodyDef();
    bodyDef.type = BodyType.DynamicBody;
    bodyDef.position.set(PosX, PosY);
    PolygonShape shape = new PolygonShape();
    shape.setAsBox(sprite.getWidth()/2-1, sprite.getHeight()/2-1);
    Radius=(float)Math.sqrt((double)(sprite.getWidth()*sprite.getWidth()/4+sprite.getHeight()*sprite.getHeight()/4) );
    FixtureDef fixDef = new FixtureDef();
    fixDef.shape = shape;
    fixDef.density = 1f;
    fixDef.restitution = .1f;
    fixDef.friction = .5f;
    TankBody = world.createBody(bodyDef);
    TankBody.createFixture(fixDef);
    TankBody.setLinearDamping(2f);
    TankBody.setAngularDamping(2f);

    TankBody.setUserData(42);


    this.type = tankType;
    maxLife = 100;
    currentLife = maxLife;

    fullLifeWidth = 300;


}

public Rectangle getRect() {
    Rectangle Rectanlge = new Rectangle(sprite.getX(), sprite.getY(), sprite.getWidth(), sprite.getHeight());
    return Rectanlge;
}

private void registerController() {
    for (Controller controller : Controllers.getControllers()) {
        controller.addListener(new GamepadInputProvider(this));
    }
}

public float getX() {
    return sprite.getX();

}

public float getY() {
    return sprite.getY();
}

public float getRotation() {
    return sparm.getRotation();
}

public void collision() {

}

public void takeDamage(int damage) {
    currentLife -= damage;
}

public void defineTank() { //verwenden wir net physic engine
    BodyDef bDef = new BodyDef();
    bDef.position.set(sprite.getX(), sprite.getY());
    bDef.type = BodyDef.BodyType.DynamicBody;
    b2Body = world.createBody(bDef);

    FixtureDef fDef = new FixtureDef();
    PolygonShape shape = new PolygonShape();
    shape.setAsBox(70, 70);
    // fDef.density = 1f;
    fDef.shape = shape;

    b2Body.createFixture(fDef);

}

public void render()
{
    sb.begin();
    float x=TankBody.getPosition().x-sprite.getWidth()/2;
    float y=TankBody.getPosition().y-sprite.getHeight()/2;


    sprite.setPosition(x, y);
    sprite.setRotation((float)(TankBody.getAngle()/Math.PI*180f));
    sparm.setPosition(x, y);
    sparm.setRotation((float)(TankBody.getAngle()/Math.PI*180f+canonrotation) );
    sprite.draw(sb);
    sparm.draw(sb);
    sb.end();
    Flower destroy = null;
    boolean del=false;
    for (Flower flower : flowers)
    {
        if(flower.todelete==0)
        {
            del=true;
            destroy=flower;
        }
        else
        {
            flower.render();
        }
    }
    if(del)
    {
        flowers.remove(destroy);
        destroy.delete();
        del=false;
    }

    renderLifebar();
}

這是它工作的類：

public class Playscreen extends WorldMap implements Screen {

public World world;
public SpriteBatch batch;
public float timeToSimulate;
private SEPGame game;
SpriteBatch sb;
public Tank tank;
public Target ziel;
private Tank gegner1;

boolean treffer;
public float width = Gdx.graphics.getWidth();
public float heights = Gdx.graphics.getHeight();
public WorldMap worldMap;
public Box2DDebugRenderer debugRenderer;
public Obstacle leftwall,upperwall,rightwall,lowerwall;
public Obstacle O1,O2,O3,O4;
public TextureAtlas atlas;
public MenuScreen menuScreen;

int anzahlTotePanzer = 0;

public Playscreen(SEPGame game)
{

    world= new World(new Vector2(0,0), false);
    ziel = new Target(MathUtils.random(Gdx.graphics.getWidth()-48),MathUtils.random(Gdx.graphics.getHeight()-48),world);
    tank = new Tank(world,this, null,TankType.PLAYER_2);
    gegner1 = new Tank(world, this, null,TankType.KI);
    menuScreen = new MenuScreen(game);

    atlas = new TextureAtlas("TanksGesamt.atlas");
    leftwall=new Obstacle(world,1);
    upperwall=new Obstacle(world,2);
    rightwall=new Obstacle(world,3);
    lowerwall=new Obstacle(world,4);
    O1=new Obstacle(world, 200, 523, 30, 100, 90);
    Texture t=new Texture(Gdx.files.internal("crateMetal.png"));
    O2=new Obstacle(world, 400, 100, t);
    O3=new Obstacle(world, 1200, 900, t);
    worldMap = new WorldMap();
    this.game = game;

    debugRenderer = new Box2DDebugRenderer( true, true,
            false, true, true, true );



    world.setContactListener(new ContactListener()
        {

            @Override
            public void beginContact(Contact contact)
            {

            }

            @Override
            public void endContact(Contact contact)
            {
                Fixture fixtureA = contact.getFixtureA();
                Fixture fixtureB = contact.getFixtureB();

                Body BodyA=contact.getFixtureA().getBody();
                if(BodyA.equals(ziel.TargetBody))
                {
                    treffer=true;
                }
                for (Flower flower : tank.flowers)
                {
                    if(flower.FlowerBody.equals(contact.getFixtureB().getBody())
                            ||flower.FlowerBody.equals(contact.getFixtureA().getBody()))
                    {
                        flower.todelete-=1;
                    }
                }


            }

            @Override
            public void preSolve(Contact contact, Manifold oldManifold)
            {
            }

            @Override
            public void postSolve(Contact contact, ContactImpulse impulse)
            {
            }
        });
}
public void show() {

}

public void create() {

}
public void update(float fval) {
    world.step(1 / 60f, 6, 2);

    mapRenderer.setView(mainCamera);

}

public void openMenu(){
    if(Gdx.input.isKeyJustPressed(Input.Keys.ESCAPE)){
        game.setScreen(new MenuScreen(game));
        this.dispose();
    }

}

public void render(float delta) {
    Gdx.gl.glClearColor(1, 0, 0, 1);
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
    world.step(1 / 60f, 6, 2);
    menuScreen.stage.dispose();


    worldMap.render();
    worldMap.mainCamera.update();

    tank.render();
    //tank.moveSprite();
    tank.ControllerInput();

    gegner1.render();


    ziel.render();


    tank.moveBody();
    if(ziel!=null)
    {
        ziel.render();
    }
    if (tank.readytoshoot>0)
    {
        tank.readytoshoot-=1;
    }
    debugRenderer.render( world, worldMap.mainCamera.combined );


    collision();
    if (collision()) {
        ziel = new Target(MathUtils.random(Gdx.graphics.getWidth()-48),
                MathUtils.random(Gdx.graphics.getHeight()-48),world);
        anzahlTotePanzer++;
        System.out.println(anzahlTotePanzer);
    }

    if (treffer)
    {
        treffer=false;
        ziel.delete();
        ziel = new Target(MathUtils.random(Gdx.graphics.getWidth()-48),MathUtils.random(Gdx.graphics.getHeight()-48),world);

    }
    O2.render();
 }
public boolean collision() {
    boolean col = false;
    Rectangle rectangle2 = ziel.bounds();
    for(Flower f: tank.flowers) {
        Rectangle rec1= f.getRec();
        if(rec1.overlaps(rectangle2)){
            col= true;
        }else {
             col= false;
        }
    }
    return col;
}

這是調用相同坦克類但給我一個java.lang.UnsatisfiedLinkError的類：com.badlogic.gdx.physics.box2d.PolygonShape.newPolygonShape（）

public class SurvivalMode2 extends WorldMap implements Screen {

public EnemyTank enemyTank;
public SEPGame game;
public WorldMap worldMap;
public Tank tank;
public int anzahlPanzer;
public int spawnPanzer;
public ArrayList<EnemyTank> tankListe;
public Obstacle O1,O2,O3,O4;
public Obstacle leftwall,upperwall,rightwall,lowerwall;
public Box2DDebugRenderer debugRenderer;
boolean treffer;


public SurvivalMode2(SEPGame game) {
    enemyTank = new EnemyTank(world, this,null ,TankType.KI);
    tank = new Tank(world,null,this,TankType.PLAYER_1);
    this.game = game;

    world = new World(new Vector2(0,0), false);
    worldMap = new WorldMap();


    debugRenderer = new Box2DDebugRenderer
            ( true, true, false, true, true, true );


    world.setContactListener(new ContactListener()
    {

        @Override
        public void beginContact(Contact contact)
        {

        }

        @Override
        public void endContact(Contact contact)
        {
            Fixture fixtureA = contact.getFixtureA();
            Fixture fixtureB = contact.getFixtureB();

            Body BodyA=contact.getFixtureA().getBody();
            if(BodyA.equals(enemyTank.enemyBody))
            {
                treffer=true;
            }
            for (Flower flower : tank.flowers)
            {
                if(flower.FlowerBody.equals(contact.getFixtureB().getBody())
                        ||flower.FlowerBody.equals(contact.getFixtureA().getBody()))
                {
                    flower.todelete-=1;
                }
            }


        }

        @Override
        public void preSolve(Contact contact, Manifold oldManifold)
        {
        }

        @Override
        public void postSolve(Contact contact, ContactImpulse impulse)
        {
        }
    });

}

public void update(){

    mapRenderer.setView(mainCamera);
}

@Override
public void show() {

}

@Override
public void render(float delta) {

    Gdx.gl.glClearColor(1, 0, 0, 1);
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

    worldMap.render();
    worldMap.mainCamera.update();

    enemyTank.render();
    tank.render();

}

我得到的錯誤：

Caused by: java.lang.UnsatisfiedLinkError: com.badlogic.gdx.physics.box2d.PolygonShape.newPolygonShape()J
at com.badlogic.gdx.physics.box2d.PolygonShape.newPolygonShape(Native Method)
at com.badlogic.gdx.physics.box2d.PolygonShape.<init>(PolygonShape.java:29)
at de.paluno.game.gameobjects.EnemyTank.<init>(EnemyTank.java:51)
at de.paluno.game.screens.SurvivalMode2.<init>(SurvivalMode2.java:54)
at de.paluno.game.screens.MenuScreen.survivalMode(MenuScreen.java:63)
at de.paluno.game.screens.MenuScreen$2.changed(MenuScreen.java:97)
at com.badlogic.gdx.scenes.scene2d.utils.ChangeListener.handle(ChangeListener.java:28)
at com.badlogic.gdx.scenes.scene2d.Actor.notify(Actor.java:183)
at com.badlogic.gdx.scenes.scene2d.Actor.fire(Actor.java:148)
at com.badlogic.gdx.scenes.scene2d.ui.Button.setChecked(Button.java:131)
at com.badlogic.gdx.scenes.scene2d.ui.Button$1.clicked(Button.java:94)
at com.badlogic.gdx.scenes.scene2d.utils.ClickListener.touchUp(ClickListener.java:88)
at com.badlogic.gdx.scenes.scene2d.InputListener.handle(InputListener.java:59)
at com.badlogic.gdx.scenes.scene2d.Stage.touchUp(Stage.java:350)
at com.badlogic.gdx.backends.lwjgl.LwjglInput.processEvents(LwjglInput.java:342)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:217)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:126)

這是來自Enemytank的代碼，它與坦克相同，除了像moveBody方法或以下幾行：

package de.paluno.game.gameobjects;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.math.MathUtils;
import com.badlogic.gdx.physics.box2d.*;
import de.paluno.game.SEPGame;
import de.paluno.game.screens.Playscreen;
import de.paluno.game.screens.SurvivalMode2;
import java.util.ArrayList;

public class EnemyTank extends Sprite {

    public ArrayList<EnemyTank> enemyList;
    public Sprite enemySprite;
    public SpriteBatch enemyBatch;
    public  PolygonShape shape;
    public Texture texture;
    private int currentLife;
    private int maxLife;
    private int fullLifeWidth;
    public TankType type;
    float PosX,PosY;
    public Body enemyBody;
    public BodyDef bdef;
    public FixtureDef fdef;
    public float Radius;



    public EnemyTank(World world, SurvivalMode2 survivalScreen, Playscreen screen, TankType tankType){


        enemyBatch = new SpriteBatch();
        texture = new Texture("tankBody_huge.png");
        enemySprite = new Sprite(texture);

        PosX= MathUtils.random(Gdx.graphics.getWidth()-48);
        PosY= MathUtils.random(Gdx.graphics.getHeight()-48);

        bdef = new BodyDef();
        fdef = new FixtureDef();






        // TankBody erstellen
        BodyDef bodyDef = new BodyDef();
        bodyDef.type = BodyDef.BodyType.DynamicBody;
        bodyDef.position.set(PosX, PosY);
        PolygonShape shape = new PolygonShape();
        shape.setAsBox(enemySprite.getWidth()/2-1, enemySprite.getHeight()/2-1);
        Radius=(float)Math.sqrt((double)(enemySprite.getWidth()*
                enemySprite.getWidth()/4+enemySprite.getHeight()*enemySprite.getHeight()/4) );
        FixtureDef fixDef = new FixtureDef();
        fixDef.shape = shape;
        fixDef.density = 1f;
        fixDef.restitution = .1f;
        fixDef.friction = .5f;
        enemyBody = world.createBody(bodyDef);
        enemyBody.createFixture(fixDef);
        enemyBody.setLinearDamping(2f);
        enemyBody.setAngularDamping(2f);

        enemyBody.setUserData(42);



        this.type = tankType;
        maxLife = 100;
        currentLife = maxLife;
        fullLifeWidth = 300;
    }

    public float getX() {
        return enemySprite.getX();

    }

    public float getY() {
        return enemySprite.getY();
    }








    public void render() {

        enemyBatch.begin();
        float x=enemyBody.getPosition().x-enemySprite.getWidth()/2;
        float y=enemyBody.getPosition().y-enemySprite.getHeight()/2;


        enemySprite.setPosition(x, y);
        enemySprite.setRotation((float)(enemyBody.getAngle()/Math.PI*180f));

        enemySprite.draw(enemyBatch);
        enemyBatch.end();
    }



    public void setupBody() {

    }

    public Body getBody() {
        return null;
    }

    public void setBodyToNullReference() {

    }


    public void update(float fval) {

    }
}

Answer 1

java.lang.UnsatisfiedLinkError: com.badlogic.gdx.physics.box2d.PolygonShape.newPolygonShape()J表示Java嘗試將標記為native long newPolygonShape() Java方法綁定到基礎非java本機方法，但無法找到它。

換句話說， com.badlogic.gdx.physics.box2d Java庫與相應的本機庫之間存在不匹配。

我認為它適用於一個類而不適用於其他類的原因是你調用了PolygonShape不同方法，並且發現了一個方法並且綁定了其他方法而其他方法沒有。