GLSurfaceView.onDetachedFromWindow

Question

我有一个GLSurfaceView的小问题，当我开始我的活动时，我用下面这行代码使GLSurfaceView不可见：

glSurface.setVisibility(View.INVISIBLE);

在此期间，我启动了一个从网络下载图像的AsyncTask，此时，如果我按下后退按钮，我会遇到以下异常：

java.lang.NullPointerException
E/AndroidRuntime( 1847):    at android.opengl.GLSurfaceView.onDetachedFromWindow(GLSurfaceView.java:530)
E/AndroidRuntime( 1847):    at android.view.View.dispatchDetachedFromWindow(View.java:6033)
E/AndroidRuntime( 1847):    at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1156)
E/AndroidRuntime( 1847):    at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1156)
E/AndroidRuntime( 1847):    at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1156)
E/AndroidRuntime( 1847):    at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1156)
E/AndroidRuntime( 1847):    at android.view.ViewRoot.dispatchDetachedFromWindow(ViewRoot.java:1630)
E/AndroidRuntime( 1847):    at android.view.ViewRoot.doDie(ViewRoot.java:2671)
E/AndroidRuntime( 1847):    at android.view.ViewRoot.die(ViewRoot.java:2641)
E/AndroidRuntime( 1847):    at android.view.WindowManagerImpl.removeViewImmediate(WindowManagerImpl.java:218)
E/AndroidRuntime( 1847):    at android.view.Window$LocalWindowManager.removeViewImmediate(Window.java:436)
E/AndroidRuntime( 1847):    at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3684)
E/AndroidRuntime( 1847):    at android.app.ActivityThread.access$2900(ActivityThread.java:125)
E/AndroidRuntime( 1847):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
E/AndroidRuntime( 1847):    at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 1847):    at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime( 1847):    at android.app.ActivityThread.main(ActivityThread.java:4627)
E/AndroidRuntime( 1847):    at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 1847):    at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime( 1847):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
E/AndroidRuntime( 1847):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
E/AndroidR

怎么了？

Answer 1

这可能是因为您尚未设置渲染器。

从android reference

 onDetachedFromWindow ()... Must not be called before a renderer has been set.

所以，如果你设置了渲染器(即使你还没有渲染任何东西)，这可能会避免这个问题。