如何调试GLSurfaceView的内部崩溃？

Question

我正在使用Android Cardboard SDK和开发一个VR视频查看器RajawaliVR(https://github.com/Rajawali/RajawaliVR)
在某些设备上,我从睡眠状态返回时出现此故障(其他人只显示黑屏):

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.opengl.GLSurfaceView$GLThread.surfaceCreated()' on a null object reference
    at android.opengl.GLSurfaceView.surfaceCreated(GLSurfaceView.java:523)
    at android.view.SurfaceView.updateWindow(SurfaceView.java:580)
    at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:176)
    at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:944)
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1970)
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1061)
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5891)
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
    at android.view.Choreographer.doCallbacks(Choreographer.java:580)
    at android.view.Choreographer.doFrame(Choreographer.java:550)
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5292)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)

正如你可以看到崩溃在android代码中,我该如何开始调试呢？

Answer 1

您可以访问源代码,所以从那开始.

假设你正在使用Lollipop,它就失败了:

mGLThread.surfaceCreated();

错误消息指示mGLThread为null.mGLThread =使用Web浏览器对分配(" ")进行简单搜索会显示两个实例,其中最有趣的是这一个:

public void setRenderer(Renderer renderer) {
    ...
    mGLThread = new GLThread(mThisWeakRef);

抛开一些复杂性,mGLThread只要setRenderer()被调用就应该是非null .所以要做的第一件事就是检查你的应用程序是否正在调用setRenderer()(通常是onCreate()).