Android OpenGL ES教程

Question

我正在運行Android開發人員網站上的教程，並且我已經運行了多次構建環境，現在沒有得到教程指出應該是結果的「灰色屏幕」。

鏈接到教程中的問題： http://developer.android.com/training/graphics/opengl/environment.html

程序似乎編譯和安裝就好了，但是當它運行它「意外關閉。」

這裏是我的代碼... 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); 
    } 

} 

從我所知道的，代碼應該像它會爲他們只是工作在教程中...我錯過了什麼？我不應該在這個階段能夠運行它嗎？

謝謝你們！

每請求，這是logcat的輸出：

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 

Answer 1

好吧，我想通了。

我意識到，當我初始化mGLView變量時，我正在使用新的GLSurfaceView初始化它，而不是* 我的 * GLSurfaceView。

固定碼：

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); 
    } 
}