我试图初始化GL11，因为我在引用一个具有的方法时遇到了问题
GL11 gl
作为其论据。我试图在我的渲染器类中初始化它，但它不起作用，所以我认为它的初始化扰乱了渲染器，并创建了一个新的类来初始化。
import javax.microedition.khronos.egl.EGL10;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.egl.EGLContext;
import javax.microedition.khronos.egl.EGLDisplay;
import javax.microedition.khronos.opengles.GL11;
import android.opengl.GLU;
public class Unproject {
public static float setx;
public static float sety;
public static float posx, posy, posz;
EGLConfig[] configs = new EGLConfig[1];
EGLConfig config = configs[0];
static EGLContext glContext;
public static GL11 gl = (GL11)glContext.getGL();
EGLDisplay dpy = ((EGL10) gl).eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY);
public Unproject() {
glContext = ((EGL10) gl).eglCreateContext(dpy, config, EGL10.EGL_NO_CONTEXT, null);
}
public static void vector3 (GL11 gl){
int[] viewport = new int[4];
float[] modelview = new float[16];
float[] projection = new float[16];
float winx, winy, winz;
float[] newcoords = new float[3];
gl.glGetIntegerv(GL11.GL_VIEWPORT, viewport, 0);
gl.glGetFloatv(GL11.GL_MODELVIEW_MATRIX, modelview, 0);
gl.glGetFloatv(GL11.GL_PROJECTION_MATRIX, projection, 0);
winx = (float)setx;
winy = (float)viewport[3] - sety;
winz = 0;
GLU.gluUnProject(winx, winy, winz, modelview, 0, projection, 0, viewport, 0, newcoords, 0);
posx = (int)newcoords[1];
posy = (int)newcoords[2];
posz = (int)newcoords[3];
}
}
Vector3是我遇到麻烦的方法。我把它从渲染器移到了这个类中。
这是我的渲染器：
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;
import javax.microedition.khronos.opengles.GL11;
import android.opengl.GLU;
import android.opengl.GLSurfaceView.Renderer;
import android.view.MotionEvent;
public class GLSurfaceRenderer implements Renderer{
public float setx, sety;
private float posx, posy, posz;
private double speed;
private static float rotation;
private static float statrotation;
GL11 gl;
private static FlatColoredSquare square;
private static FlatColoredSquare statSquare;
public GLSurfaceRenderer () {
square = new FlatColoredSquare();
statSquare = new FlatColoredSquare();
rotation = (float) Math.floor(Math.random()*361);
speed = 0.1;
}
public synchronized void randomMethod(MotionEvent event){
if (event.getAction() == MotionEvent.ACTION_DOWN){
setx = event.getX();
sety = event.getY();
Unproject.vector3(gl);
}
}
@Override
public void onDrawFrame(GL10 gl) {
gl.glClear(GL10.GL_COLOR_BUFFER_BIT |
GL10.GL_DEPTH_BUFFER_BIT);
gl.glLoadIdentity();
gl.glScalef(10, 10, 0);
gl.glPushMatrix();
gl.glRotatef(rotation, 0, 0, 1);
gl.glTranslatef((float) speed/10, 0, 0);
square.draw(gl);
gl.glPopMatrix();
gl.glPushMatrix();
gl.glTranslatef(posx, posy, posz);
gl.glRotatef(statrotation,0,0,1);
statSquare.draw(gl);
gl.glPopMatrix();
statrotation++;
speed++;
}
@Override
public void onSurfaceChanged(GL10 gl, int width, int height) {
gl.glViewport(0, 0, width, height);
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
GLU.gluOrtho2D(gl, 0.0f, width, 0.0f, height);
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glLoadIdentity();
}
@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
gl.glShadeModel(GL10.GL_SMOOTH);
gl.glClearDepthf(1.0f);
gl.glEnable(GL10.GL_DEPTH_TEST);
gl.glDepthFunc(GL10.GL_LEQUAL);
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_NICEST);
}
}
不幸的是，此代码引发ExceptionInInitializeError
08-01 17:01:34.672: ERROR/AndroidRuntime(421): Uncaught handler: thread main exiting due to uncaught exception
08-01 17:01:34.762: ERROR/AndroidRuntime(421): java.lang.ExceptionInInitializerError
08-01 17:01:34.762: ERROR/AndroidRuntime(421): at android.app.ui.GLSurfaceRenderer.randomMethod(GLSurfaceRenderer.java:44)
08-01 17:01:34.762: ERROR/AndroidRuntime(421): at android.app.ui.Practice.onTouchEvent(Practice.java:37)
08-01 17:01:34.762: ERROR/AndroidRuntime(421): at android.app.Activity.dispatchTouchEvent(Activity.java:2064)
08-01 17:01:34.762: ERROR/AndroidRuntime(421): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
08-01 17:01:34.762: ERROR/AndroidRuntime(421): at android.view.ViewRoot.handleMessage(ViewRoot.java:1690)
08-01 17:01:34.762: ERROR/AndroidRuntime(421): at android.os.Handler.dispatchMessage(Handler.java:99)
08-01 17:01:34.762: ERROR/AndroidRuntime(421): at android.os.Looper.loop(Looper.java:123)
08-01 17:01:34.762: ERROR/AndroidRuntime(421): at android.app.ActivityThread.main(ActivityThread.java:4310)
08-01 17:01:34.762: ERROR/AndroidRuntime(421): at java.lang.reflect.Method.invokeNative(Native Method)
08-01 17:01:34.762: ERROR/AndroidRuntime(421): at java.lang.reflect.Method.invoke(Method.java:521)
08-01 17:01:34.762: ERROR/AndroidRuntime(421): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
08-01 17:01:34.762: ERROR/AndroidRuntime(421): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
08-01 17:01:34.762: ERROR/AndroidRuntime(421): at dalvik.system.NativeStart.main(Native Method)
08-01 17:01:34.762: ERROR/AndroidRuntime(421): Caused by: java.lang.NullPointerException
08-01 17:01:34.762: ERROR/AndroidRuntime(421): at android.app.ui.Unproject.<clinit>(Unproject.java:22)
08-01 17:01:34.762: ERROR/AndroidRuntime(421): ... 13 more
我能做些什么来纠正这个问题吗？我是不是完全搞错了？我想这可能是我在类之间共享变量的方式，有更好的方法吗？
基于此文档，抛出ExceptionInInitializerError，表示在评估静态初始值设定项或静态变量的初始值设定值时发生异常。检查您的代码是否有任何静态初始化逻辑。
您得到的错误似乎是因为类初始化中出现NullPointerException。
static EGLContext glContext;
public static GL11 gl = (GL11)glContext.getGL();
您会注意到，您正试图从未初始化的EGLContext实例调用getGl((。你需要先将glContext分配给某个东西，然后才能使用它
stacktrace提到了<clinit>，如果你不知道它的意思，它就没有多大帮助。它引用的是类初始化，这是初始化静态成员时发生的情况(在本例中(，但它也可以引用一个静态初始化块，如下所示：
static {
//some static init code
}
抛出ExceptionInInitializerError的原因可能是因为更高级别的东西正在捕获所有异常，并将它们封装在ExceptionInInitializerError中。