处理 Android 中的“找不到图像”错误

Question

我正在尝试打开位于路径“sketchfolder/data/1024x768/gulli2.png”的图像。它在 Windows 上运行良好，但在 Android 上无法运行并出现错误。这是错误：

找不到图像 \1024x768\gulli2.png。致命例外： 动画线程进程：processing.test.exercise_5_3_noisechain， PID: 11878 java.lang.NullPointerException 在 processing.test.exercise_5_3_noisechain.Exercise_5_3_NoiseChain$Gulli.(Exercise_5_3_NoiseChain.java:112) 在 processing.test.exercise_5_3_noisechain.Exercise_5_3_NoiseChain.setup(Exercise_5_3_NoiseChain.java:37) 在 processing.core.PApplet.handleDraw(Unknown Source) 在 processing.core.PGraphicsAndroid2D.requestDraw（未知来源）在 processing.core.PApplet.run（未知来源）在 java.lang.Thread.run(Thread.java:841)

我正在尝试的代码：

class Gulli {
  Body body;
  float w;
  float h;
  float angle;
  PImage img;

  Gulli(float x_, float y_) {
    float x = x_;
    float y = y_;
    w = (float)(width*2.2/100.0);
    h = w/2;
    img = loadImage("\\1024x768\\gulli2.png");
    img.loadPixels();
    img.resize((int)w*2,0);
    img.updatePixels();
    angle = 0;
    makeBody(new Vec2(x, y), w, h, angle);
  }

  void makeBody(Vec2 center, float w_, float h_, float a) {
    BodyDef bd = new BodyDef();
    bd.position.set(box2d.coordPixelsToWorld(center));
    bd.setAngularVelocity(a);
    bd.type = BodyType.DYNAMIC;
    bd.bullet = true;
    body = box2d.createBody(bd);
    PolygonShape sd = new PolygonShape();
    Vec2 []vertices = new Vec2[6];
    vertices[0] = new Vec2(box2d.scalarPixelsToWorld(w), 0);
    vertices[1] = new Vec2(box2d.scalarPixelsToWorld(h), box2d.scalarPixelsToWorld(h/3));
    vertices[2] = new Vec2(box2d.scalarPixelsToWorld(-h), box2d.scalarPixelsToWorld(h/3));
    vertices[3] = new Vec2(box2d.scalarPixelsToWorld(-w), 0);
    vertices[4] = new Vec2(box2d.scalarPixelsToWorld(-h), box2d.scalarPixelsToWorld(-h/3));
    vertices[5] = new Vec2(box2d.scalarPixelsToWorld(h), box2d.scalarPixelsToWorld(-h/3));
    sd.set(vertices, vertices.length);
    FixtureDef fd = new FixtureDef();
    fd.shape = sd;
    fd.density = 4.0;
    fd.friction = 0.6;
    fd.restitution = 0.3;
    body.createFixture(fd);
    bd.allowSleep = false;
    body.setUserData(this);
  }

  void display() {
    Vec2 pos = box2d.getBodyPixelCoord(body);
    float a = body.getAngle();
    Fixture f = body.getFixtureList();
    PolygonShape ps = (PolygonShape) f.getShape();
    pushMatrix();
    translate(pos.x, pos.y);
    rotate(-a);
    image(img, 0, 0);
    popMatrix();
  }
} 


import shiffman.box2d.*;
import org.jbox2d.collision.shapes.*;
import org.jbox2d.common.*;
import org.jbox2d.dynamics.*;

Box2DProcessing box2d;
Gulli gulli;

void setup() {
//  size(1024, 768);  // turn on for windows
  box2d = new Box2DProcessing(this);
  box2d.createWorld();
  gulli = new Gulli((float)width*15.0/100.0, (float)height*95.0/100.0);    
  smooth();
}

void draw() {
  gulli.display();
  box2d.step();
}

请帮忙..谢谢..

Answer 1

您的日志显示 NullPointerException 错误，这意味着您正试图指向一个不存在的图像。 尝试包括整个路径。并且没有双斜杠“//”。 如果您使用 URI 格式，则可能是控件不支持这些格式。如果是这种情况，请先下载图像，然后再加载。