android - 如何在Timer中使用OpenGL

Question

当我预先加载所有位图(带有测试数据)时，以下代码有效

for (bitmap in bitmaps){
  feedInOpenGL(bitmap)  
}

但是当我尝试使用计时器创建位图时，

timer!!.scheduleAtFixedRate(object : TimerTask() {
            override fun run() {
                if (!recording) return
                val bitmap = getNextBitmap()
                feedInOpenGL(bitmap)
            }
        }, 0, frameDuration)

我无法停止MediaMuxer。当我尝试停止它时，它会

D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.tolotra.screenrecordexample, PID: 31248
    java.lang.IllegalStateException: Failed to stop the muxer
        at android.media.MediaMuxer.nativeStop(Native Method)
        at android.media.MediaMuxer.stop(MediaMuxer.java:454)
        at com.tolotra.screen_recorder.VideoBuilder._cleanUp(VideoBuilder.kt:292)
        at com.tolotra.screen_recorder.VideoBuilder.finish(VideoBuilder.kt:95)
        at com.tolotra.screen_recorder.ScreenRecorder$stop$1.run(ScreenRecorder.kt:156)
        at android.os.Handler.handleCallback(Handler.java:873)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6734)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

挖完之后，我在某处读书

OpenGL always operates on a context that is made "current" and thecontext holds data in thread-local storage. This means it'sthread-specific. Therefore you always need to be aware from whichthread you're calling the OpenGL functions.

因此，我怀疑问题出在我的计时器上，因为它每次都会创建一个新线程。
如果我怀疑是真的，该如何使用计时器进行这项工作？

Answer 1

解决方案是在同一线程上运行OpenGL / MediaMuxer / MediaEncoder设置/启动/停止和计时器回调。
这是使用单线程执行器实现的

tpe = Executors.newSingleThreadExecutor()
        tpe?.submit(Runnable {
            this.recording = true;
            _startRecorderWorker();
        })

并在计时器中

 timer!!.scheduleAtFixedRate(object : TimerTask() {
            override fun run() {
                if (!recording) return;
                tpe?.submit(Runnable {
                    loop()
                })

            }
        }, 0, frameDuration)