Android DJI SDK 显示视频几秒报错

Question

我不知道为什么会出现此错误：

E/UsbAccessoryService: recvBufferThread.start
E/UsbAccessoryService: RecvOsdRunnable true
E/UsbAccessoryService: rate 0.52 KB
E/UsbAccessoryService: parseVideoThread.start
E/DJIPackManager: pack senderType=14 cmdSet=9
E/UsbAccessoryService: ParseVideoRunnable true
E/DJIBaseProduct: Camera needCreateNew: true
E/DJIBaseProduct: put component
E/DJIBaseProduct: Gimbal needCreateNew: true
E/DJIBaseProduct: put component
E/DJIBaseProduct: FlightController needCreateNew: true
E/DJIBaseProduct: put component
E/DJIBaseProduct: update battery platformType: P4
E/DJIBaseProduct: update battery phantom
E/DJIBaseProduct: Battery needCreateNew: true
E/Event: Could not dispatch event: class dji.midware.data.model.P3.DataEyeGetPushFrontAvoidance to subscribing class class dji.sdk.FlightController.DJIIntelligentFlightAssistant$InnerEventBus
                                                              java.lang.NullPointerException: Attempt to invoke interface method 'int java.util.List.size()' on a null object reference
                                                                  at dji.sdk.FlightController.DJIIntelligentFlightAssistant$InnerEventBus.onEventBackgroundThread(Unknown Source)
                                                                  at java.lang.reflect.Method.invoke(Native Method)
                                                                  at java.lang.reflect.Method.invoke(Method.java:372)
                                                                  at dji.thirdparty.eventbus.EventBus.invokeSubscriber(EventBus.java:569)
                                                                  at dji.thirdparty.eventbus.EventBus.postToSubscription(EventBus.java:513)
                                                                  at dji.thirdparty.eventbus.EventBus.postSingleEvent(EventBus.java:475)
                                                                  at dji.thirdparty.eventbus.EventBus.post(EventBus.java:365)
                                                                  at dji.midware.data.manager.P3.t.post(Unknown Source)
                                                                  at dji.midware.data.manager.P3.t.setPushRecData(Unknown Source)
                                                                  at dji.midware.data.manager.P3.t.setPushRecPack(Unknown Source)
                                                                  at dji.midware.data.manager.P3.l.b(Unknown Source)
                                                                  at dji.midware.data.manager.P3.l.a(Unknown Source)
                                                                  at dji.midware.data.manager.P3.l.a(Unknown Source)
                                                                  at dji.midware.usb.P3.UsbAccessoryService.onGetBody(Unknown Source)
                                                                  at dji.midware.f.a.f.b(Unknown Source)
                                                                  at dji.midware.f.a.f.a(Unknown Source)
                                                                  at dji.midware.usb.P3.UsbAccessoryService$RecvBufferRunnable.run(Unknown Source)
                                                                  at java.lang.Thread.run(Thread.java:818)

来自 TextureView 的视频源出现几秒钟，然后涉及显示视频源的 activity 退出到 MainActivity。（我使用 MainActivity 通过菜单转换到 VideoFeedActivity）。我不知道空指针是什么或它来自哪里，因为我相信我正在正确初始化所有内容，但事实并非如此。在实现函数 onSurfaceTextureUpdated(SurfaceTexture texture) 的 SurfaceTextureListener 中，我正在对每一帧的位图进行分析。但是我怀疑这是问题所在，我认为这与无人机对象的初始化以及它们的交互方式有关。我试图在加载视频流之前关闭 IntelligentFlightAssistant；但是，这没有影响。

Answer 1

我知道问题出在哪里了：

每次制作新帧来分析图像时，我都会创建一个新线程，这导致了失败。为了解决这个问题，我做了一个新线程，只有在当前线程未被使用时才能创建新线程。（我知道这违背了线程的目的，但我不希望此操作减慢进程运行应用程序）。无论如何，这解决了问题，现在程序运行正常。

Android DJI SDK 显示视频几秒报错

Android DJI SDK error when video displayed for a few seconds

java

android

dji-sdk