安卓OpenGL ES教程

Question

我正在Android开发者网站上的教程中学习，已经多次构建环境，但没有得到教程中应该出现的“灰屏”结果。

相关教程链接: http://developer.android.com/training/graphics/opengl/environment.html 程序似乎编译和安装都很好，但运行时会“意外关闭”。

以下是我的代码... Main.java:

package com.wiley.openglplayground;

import android.app.Activity;
import android.content.Context;
import android.opengl.GLSurfaceView;
import android.os.Bundle;

public class Main extends Activity {

    private GLSurfaceView mGLView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mGLView = new GLSurfaceView(this);
        setContentView(mGLView);
    }

    class MyGLSurfaceView extends GLSurfaceView {

        public MyGLSurfaceView(Context context) {
            super(context);

            setEGLContextClientVersion(2);

            setRenderer(new MyRenderer());

            setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
        }
    }
}

MyRenderer.java:

package com.wiley.openglplayground;

import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;

import android.opengl.GLES20;
import android.opengl.GLSurfaceView;

public class MyRenderer implements GLSurfaceView.Renderer {

    @Override
    public void onDrawFrame(GL10 gl) {
        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);

    }

    @Override
    public void onSurfaceChanged(GL10 gl, int width, int height) {
        GLES20.glViewport(0, 0, width, height);

    }

    @Override
    public void onSurfaceCreated(GL10 gl, EGLConfig config) {
        GLES20.glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
    }

}

据我所知，这段代码应该和教程中的一样工作... 我错过了什么吗？在这个阶段我不能运行它吗？

谢谢大家！

根据请求，以下是LogCat输出：

12-27 14:27:05.768: W/ActivityThread(3493): Application com.wiley.openglplayground is waiting for the debugger on port 8100...
12-27 14:27:05.778: I/System.out(3493): Sending WAIT chunk
12-27 14:27:05.878: I/dalvikvm(3493): Debugger is active
12-27 14:27:05.978: I/System.out(3493): Debugger has connected
12-27 14:27:05.978: I/System.out(3493): waiting for debugger to settle...
12-27 14:27:06.179: I/System.out(3493): waiting for debugger to settle...
12-27 14:27:06.379: I/System.out(3493): waiting for debugger to settle...
12-27 14:27:06.579: I/System.out(3493): waiting for debugger to settle...
12-27 14:27:06.779: I/System.out(3493): waiting for debugger to settle...
12-27 14:27:06.979: I/System.out(3493): waiting for debugger to settle...
12-27 14:27:07.180: I/System.out(3493): waiting for debugger to settle...
12-27 14:27:07.380: I/System.out(3493): waiting for debugger to settle...
12-27 14:27:07.580: I/System.out(3493): debugger has settled (1420)
12-27 14:27:07.890: D/libEGL(3493): loaded /system/lib/egl/libGLES_android.so
12-27 14:27:07.890: D/libEGL(3493): loaded /system/lib/egl/libEGL_adreno200.so
12-27 14:27:07.900: D/libEGL(3493): loaded /system/lib/egl/libGLESv1_CM_adreno200.so
12-27 14:27:07.900: D/libEGL(3493): loaded /system/lib/egl/libGLESv2_adreno200.so
12-27 14:27:07.950: D/OpenGLRenderer(3493): Enabling debug mode 0
12-27 14:27:08.711: D/dalvikvm(3493): threadid=1: still suspended after undo (sc=1 dc=1)
12-27 14:28:21.132: D/AndroidRuntime(3493): Shutting down VM
12-27 14:28:21.132: W/dalvikvm(3493): threadid=1: thread exiting with uncaught exception (group=0x40a601f8)
12-27 14:28:21.252: E/AndroidRuntime(3493): FATAL EXCEPTION: main
12-27 14:28:21.252: E/AndroidRuntime(3493): java.lang.NullPointerException
12-27 14:28:21.252: E/AndroidRuntime(3493):     at android.opengl.GLSurfaceView.surfaceCreated(GLSurfaceView.java:512)
12-27 14:28:21.252: E/AndroidRuntime(3493):     at android.view.SurfaceView.updateWindow(SurfaceView.java:533)
12-27 14:28:21.252: E/AndroidRuntime(3493):     at android.view.SurfaceView.access$000(SurfaceView.java:81)
12-27 14:28:21.252: E/AndroidRuntime(3493):     at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:169)
12-27 14:28:21.252: E/AndroidRuntime(3493):     at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:590)
12-27 14:28:21.252: E/AndroidRuntime(3493):     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1617)
12-27 14:28:21.252: E/AndroidRuntime(3493):     at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2442)
12-27 14:28:21.252: E/AndroidRuntime(3493):     at android.os.Handler.dispatchMessage(Handler.java:99)
12-27 14:28:21.252: E/AndroidRuntime(3493):     at android.os.Looper.loop(Looper.java:137)
12-27 14:28:21.252: E/AndroidRuntime(3493):     at android.app.ActivityThread.main(ActivityThread.java:4575)
12-27 14:28:21.252: E/AndroidRuntime(3493):     at java.lang.reflect.Method.invokeNative(Native Method)
12-27 14:28:21.252: E/AndroidRuntime(3493):     at java.lang.reflect.Method.invoke(Method.java:511)
12-27 14:28:21.252: E/AndroidRuntime(3493):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
12-27 14:28:21.252: E/AndroidRuntime(3493):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
12-27 14:28:21.252: E/AndroidRuntime(3493):     at dalvik.system.NativeStart.main(Native Method)
12-27 14:28:21.442: I/Process(3493): Sending signal. PID: 3493 SIG: 9

- Sector95

---

你是否遇到了异常？如果是，请添加带有堆栈跟踪的logcat输出。 - micha

您还需要确保部署OpenGL ES 2.0的设备支持它。如果您正在使用Android模拟器，则需要选择硬件加速（仿真选项：使用主机GPU）。 - Ryan Maloney

谢谢大家的回复！我已经将LogCat输出添加到问题中了。不幸的是，我不知道如何在Eclipse中发布堆栈跟踪...有什么建议吗？ - Sector95

哦，我以为我已经在之前的评论中添加了这个，但我知道该设备可以使用OpenGL ES 2.0，因为从Google下载的程序运行良好。然而，在那个程序中，他们已经完成了绘制三角形的所有步骤。 - Sector95

Answer 1

好的，我弄清楚了。

我意识到当我初始化mGLView变量时，我是用新的GLSurfaceView而不是*My*GLSurfaceView进行初始化的。

修正后的代码：

package com.wiley.opengles;

import android.app.Activity;
import android.content.Context;
import android.opengl.GLSurfaceView;
import android.os.Bundle;

public class MainActivity extends Activity {

    public GLSurfaceView mGLView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mGLView = new MyGLSurfaceView(this); //This is where the problem was.
        setContentView(mGLView);
    }
}

class MyGLSurfaceView extends GLSurfaceView {

    public MyGLSurfaceView(Context context) {
        super(context);

        setEGLContextClientVersion(2);

        setRenderer(new MyRenderer());
        setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
    }
}

- Sector95