Delphi - JNI 错误答案

【问题标题】：Delphi - JNI ErrorDelphi - JNI 错误
【发布时间】：2016-04-05 20:56:29
【问题描述】：

我正在 Delphi 10 Seattle 为 android 开发一个应用程序，该应用程序从 TCameraComponent 获取图像并使用 TIdUDPServer 发送给另一台设备。我创建了一个线程来处理 TIdUDPServer 并发送图像和其他文本命令。它是这样工作的：主线程将位图写入线程内部，然后线程发送。

问题是应用程序每 5 或 4 分钟崩溃一次并出现致命信号 6 错误，我认为这与访问同一对象的线程有关，我尝试使用 TCriticalSection 保护对象，但我仍然得到错误。

这是主线程的代码

procedure TFormMain.CameraComponent1SampleBufferReady(Sender: TObject;
  const ATime: TMediaTime);
var
  Bitm: TBitmap;
begin
  try
    Bitm:= TBitmap.Create;
    CameraComponent1.SampleBufferToBitmap(Bitm, True);
    BabyImag.Bitmap.Assign(Bitm);
    Log.d('DBBaby', nil, 'Image on Screen');
    if SendVideo then
      FCommThread.SetGetImage(Bitm, True);
  finally
    Bitm.Free;
    Bitm:= nil;
  end;
end;

这是发送图像的线程的部分代码

type
  TComThread = class(TThread)
  private
    { Some code }
    CriticalX: TCriticalSection;
  public 
    Constructor Create(UserType: Integer);
    { Some code }
    function SetGetImage(ImageBitmap: TBitmap; SetOrGet: Boolean): TBitmap;
  protected
    procedure Execute; override;
  end;

implementation

constructor TComThread.Create(UserType: Integer);
begin
  inherited Create (True);
  FreeOnTerminate := True;
  { Some code }
  CriticalX:= TCriticalSection.Create;
  FImage:= TBitmap.Create;
end;

procedure TComThread.Execute;
var
  BitmSurface: TBitmapSurface;
  ToJPEG: TBitmapCodecManager;
  quality: TBitmapCodecSaveParams;
  CameraImg: TMemoryStream;
begin
  while SendBabyVideo do
  begin
    try
      if Assigned(FImage) then
      begin
        try
          CameraImg:= TMemoryStream.Create();
          BitmSurface:= TBitmapSurface.Create;
          ToJPEG:= TBitmapCodecManager.Create;
          quality.Quality:= 50;
          //BitmSurface.Assign(FImage);
          BitmSurface.Assign(SetGetImage(nil, False));
          Log.d('DBBaby', nil, 'SurfWidth ' + IntToStr(BitmSurface.Width));
          if (BitmSurface.Width > 0) AND (BitmSurface.Height > 0) then
          begin
            // Image stream ready
            ToJPEG.SaveToStream(CameraImg, BitmSurface, '.jpg', @quality);
            CamSize:= CameraImg.Size;
            SetLength(bffrImg, CamSize+8);
            bffrImg[0]:= $FF;
            bffrImg[1]:= $FF;
            bffrImg[2]:= $16;
            bffrImg[3]:= $09;
            bffrImg[4]:= byte(CamSize);
            bffrImg[5]:= byte(CamSize shr 8);
            bffrImg[6]:= byte(CamSize shr 16);
            bffrImg[7]:= byte(CamSize shr 24);

            CameraImg.Position:= 0;
            CameraImg.Read(bffrImg[8], CamSize);

            Log.d('DBBaby', nil, 'Imagem total: '+IntToStr(Length(bffrImg)));
          end;
        finally
          BitmSurface.Free;
          BitmSurface:= nil;
          ToJPEG.Free;
          ToJPEG:= nil;
          CameraImg.Free;
          CameraImg:= nil;
        end;
      end;
    except
      on E: Exception do
      begin
        Log.d('DBBaby', nil, '------------------------ GET STREAM');
        Log.d('DBBaby', nil, E.message);
      end;
    end;

    try
      if (PeerIP <> '') AND (PeerIP <> '255.255.255.255') then
      begin
        if (bffr <> nil) AND (bffrImg <> nil) then
        begin
          FUDPBABY.SendBuffer(PeerIP, PeerPort, TIdIPVersion.Id_IPv4, bffr);
          FUDPBABY.SendBuffer(PeerIP, PeerPort, TIdIPVersion.Id_IPv4, bffrImg);
      end;
    except
      on E: Exception do
      begin
        Log.d('DBBaby', nil, '------------------------ SEND STREAM');
        Log.d('DBBaby', nil, E.message);
      end;
    end;
  end;
end;

function TComThread.SetGetImage(ImageBitmap: TBitmap; SetOrGet: Boolean): TBitmap;
begin
  CriticalX.Enter;
  try
    if SetOrGet then
    begin
      Self.FImage.Assign(ImageBitmap);
      Result:= nil;
    end
    else
    begin
      Result:= Self.FImage;
    end;
  finally
    CriticalX.Leave;
  end;
end;

我使用的是 Moto E Android 6.0，NDK 是 r11b。在 SDK Manager 中，我将所有配置设置为 API 23。

这是日志。

04-05 17:00:28.743 27591-27591/com.Test2.Project2 D/skia: onFlyCompress
04-05 17:00:28.780 27591-27611/com.Test2.Project2 I/info: FMX: Project2: DBBaby (Nil): Image on Screen
04-05 17:00:28.807 27591-27591/com.Test2.Project2 D/skia: onFlyCompress
04-05 17:00:28.818 27591-28475/com.Test2.Project2 I/info: FMX: Project2: DBBaby (Nil): SurfWidth 144
04-05 17:00:28.822 27591-28475/com.Test2.Project2 I/info: FMX: Project2: DBBaby (Nil): Imagem total: 1946
04-05 17:00:28.846 27591-27611/com.Test2.Project2 I/info: FMX: Project2: DBBaby (Nil): Image on Screen
04-05 17:00:28.876 27591-27591/com.Test2.Project2 D/skia: onFlyCompress
04-05 17:00:28.912 27591-27611/com.Test2.Project2 I/info: FMX: Project2: DBBaby (Nil): Image on Screen
04-05 17:00:28.942 27591-27591/com.Test2.Project2 D/skia: onFlyCompress
04-05 17:00:28.978 27591-27611/com.Test2.Project2 I/info: FMX: Project2: DBBaby (Nil): Image on Screen
04-05 17:00:29.008 27591-28475/com.Test2.Project2 I/info: FMX: Project2: DBBaby (Nil): SurfWidth 144
04-05 17:00:29.012 27591-27591/com.Test2.Project2 D/skia: onFlyCompress
04-05 17:00:29.015 27591-28475/com.Test2.Project2 I/info: FMX: Project2: DBBaby (Nil): Imagem total: 1943
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410] JNI DETECTED ERROR IN APPLICATION: use of invalid jobject 0xb9f7a0b0
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]     from java.lang.Object com.embarcadero.rtl.ProxyInterface.dispatchToNative(java.lang.String, java.lang.Object[], long)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410] "main" prio=5 tid=1 Runnable
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   | group="main" sCount=0 dsCount=0 obj=0x73f5af98 self=0xb70f0c60
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   | sysTid=27591 nice=0 cgrp=default sched=0/0 handle=0xb6f94b34
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   | state=R schedstat=( 46379176934 4119603860 17774 ) utm=4206 stm=431 core=0 HZ=100
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   | stack=0xbe418000-0xbe41a000 stackSize=8MB
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   | held mutexes= "mutator lock"(shared held)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #00 pc 0035c6d5  /system/lib/libart.so (art::DumpNativeStack(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, int, char const*, art::ArtMethod*, void*)+116)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #01 pc 0033d7cf  /system/lib/libart.so (art::Thread::Dump(std::__1::basic_ostream<char, std::__1::char_traits<char> >&) const+138)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #02 pc 0024f6a1  /system/lib/libart.so (art::JavaVMExt::JniAbort(char const*, char const*)+760)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #03 pc 0024fda9  /system/lib/libart.so (art::JavaVMExt::JniAbortF(char const*, char const*, ...)+68)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #04 pc 0033e32b  /system/lib/libart.so (art::Thread::DecodeJObject(_jobject*) const+174)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #05 pc 000fff55  /system/lib/libart.so (art::ScopedCheck::Check(art::ScopedObjectAccess&, bool, char const*, art::JniValueType*) (.constprop.95)+900)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #06 pc 0010e193  /system/lib/libart.so (art::CheckJNI::CallMethodA(char const*, _JNIEnv*, _jobject*, _jclass*, _jmethodID*, jvalue*, art::Primitive::Type, art::InvokeType)+498)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #07 pc 0010ed57  /system/lib/libart.so (art::CheckJNI::CallIntMethodA(_JNIEnv*, _jobject*, _jmethodID*, jvalue*)+30)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #08 pc 006913e5  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (ExecJNI+884)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #09 pc 01135073  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #10 pc 01141607  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #11 pc 010b047f  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #12 pc 010ab189  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #13 pc 01135021  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #14 pc 005d9d5f  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #15 pc 005cde87  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #16 pc 005cf035  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #17 pc 005ac013  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #18 pc 006a10bf  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #19 pc 000aca1b  /data/app/com.Test2.Project2-2/oat/arm/base.odex (java.lang.Object com.embarcadero.rtl.ProxyInterface.dispatchToNative(java.lang.String, java.lang.Object[], long)+134)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #20 pc 000acadb  /data/app/com.Test2.Project2-2/oat/arm/base.odex (java.lang.Object com.embarcadero.rtl.ProxyInterface.invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[])+118)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #21 pc 0029879d  /system/framework/arm/boot.oat (???)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at com.embarcadero.rtl.ProxyInterface.dispatchToNative(Native method)
04-05 17:00:29.163 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at com.embarcadero.rtl.ProxyInterface.invoke(ProxyInterface.java:21)
04-05 17:00:29.165 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at java.lang.reflect.Proxy.invoke(Proxy.java:393)
04-05 17:00:29.165 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at android.hardware.Camera$PreviewCallback.onPreviewFrame(Camera.java:-2)
04-05 17:00:29.165 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at android.hardware.Camera$EventHandler.handleMessage(Camera.java:1129)
04-05 17:00:29.165 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at android.os.Handler.dispatchMessage(Handler.java:102)
04-05 17:00:29.165 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at android.os.Looper.loop(Looper.java:148)
04-05 17:00:29.165 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at android.app.ActivityThread.main(ActivityThread.java:5443)
04-05 17:00:29.165 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at java.lang.reflect.Method.invoke!(Native method)
04-05 17:00:29.165 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
04-05 17:00:29.165 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
04-05 17:00:29.165 27591-27591/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410] 

04-05 17:00:29.501 27591-27591/com.Test2.Project2 A/libc: Fatal signal 6 (SIGABRT), code -6 in tid 27591

任何帮助将不胜感激。

我已经尝试了代码，但仍然收到致命信号 6 查看日志：

04-06 08:24:12.660 18999-19023/com.Test2.Project2 I/info: FMX: Project2: DBBaby (Nil): Image on Screen
04-06 08:24:12.712 18999-18999/com.Test2.Project2 D/skia: onFlyCompress
04-06 08:24:12.726 18999-19023/com.Test2.Project2 I/info: FMX: Project2: DBBaby (Nil): Image on Screen
04-06 08:24:12.778 18999-18999/com.Test2.Project2 D/skia: onFlyCompress
04-06 08:24:12.779 18999-20099/com.Test2.Project2 I/info: FMX: Project2: DBBaby (Nil): SurfWidth 144
04-06 08:24:12.784 18999-20099/com.Test2.Project2 I/info: FMX: Project2: DBBaby (Nil): Imagem total: 2984
04-06 08:24:12.785 18999-18999/com.Test2.Project2 E/art: JNI ERROR (app bug): accessed stale global reference 0x203776 (index 3549 in a table of size 3546)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410] JNI DETECTED ERROR IN APPLICATION: use of deleted global reference 0x203776
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]     from java.lang.Object com.embarcadero.rtl.ProxyInterface.dispatchToNative(java.lang.String, java.lang.Object[], long)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410] "main" prio=5 tid=1 Runnable
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   | group="main" sCount=0 dsCount=0 obj=0x73f5af98 self=0xb70f0c60
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   | sysTid=18999 nice=0 cgrp=default sched=0/0 handle=0xb6f94b34
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   | state=R schedstat=( 5347038051 485186867 2088 ) utm=480 stm=54 core=3 HZ=100
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   | stack=0xbe418000-0xbe41a000 stackSize=8MB
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   | held mutexes= "mutator lock"(shared held)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #00 pc 0035c6d5  /system/lib/libart.so (art::DumpNativeStack(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, int, char const*, art::ArtMethod*, void*)+116)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #01 pc 0033d7cf  /system/lib/libart.so (art::Thread::Dump(std::__1::basic_ostream<char, std::__1::char_traits<char> >&) const+138)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #02 pc 0024f6a1  /system/lib/libart.so (art::JavaVMExt::JniAbort(char const*, char const*)+760)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #03 pc 0024fda9  /system/lib/libart.so (art::JavaVMExt::JniAbortF(char const*, char const*, ...)+68)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #04 pc 0033e52b  /system/lib/libart.so (art::Thread::DecodeJObject(_jobject*) const+686)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #05 pc 000fff55  /system/lib/libart.so (art::ScopedCheck::Check(art::ScopedObjectAccess&, bool, char const*, art::JniValueType*) (.constprop.95)+900)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #06 pc 0010e193  /system/lib/libart.so (art::CheckJNI::CallMethodA(char const*, _JNIEnv*, _jobject*, _jclass*, _jmethodID*, jvalue*, art::Primitive::Type, art::InvokeType)+498)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #07 pc 0010ee41  /system/lib/libart.so (art::CheckJNI::CallObjectMethodA(_JNIEnv*, _jobject*, _jmethodID*, jvalue*)+28)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #08 pc 00691773  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (ExecJNI+1826)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #09 pc 0113503b  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #10 pc 011415d7  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #11 pc 010b0451  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #12 pc 010ab169  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #13 pc 01134fe9  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #14 pc 005d9d3f  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #15 pc 005cde67  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #16 pc 005cf015  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #17 pc 005abff3  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #18 pc 006a109f  /data/app/com.Test2.Project2-2/lib/arm/libProject2.so (???)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #19 pc 000aca1b  /data/app/com.Test2.Project2-2/oat/arm/base.odex (java.lang.Object com.embarcadero.rtl.ProxyInterface.dispatchToNative(java.lang.String, java.lang.Object[], long)+134)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #20 pc 000acadb  /data/app/com.Test2.Project2-2/oat/arm/base.odex (java.lang.Object com.embarcadero.rtl.ProxyInterface.invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[])+118)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   native: #21 pc 0029879d  /system/framework/arm/boot.oat (???)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at com.embarcadero.rtl.ProxyInterface.dispatchToNative(Native method)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at com.embarcadero.rtl.ProxyInterface.invoke(ProxyInterface.java:21)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at java.lang.reflect.Proxy.invoke(Proxy.java:393)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at android.hardware.Camera$PreviewCallback.onPreviewFrame(Camera.java:-2)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at android.hardware.Camera$EventHandler.handleMessage(Camera.java:1129)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at android.os.Handler.dispatchMessage(Handler.java:102)
04-06 08:24:12.839 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at android.os.Looper.loop(Looper.java:148)
04-06 08:24:12.840 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at android.app.ActivityThread.main(ActivityThread.java:5443)
04-06 08:24:12.840 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at java.lang.reflect.Method.invoke!(Native method)
04-06 08:24:12.840 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
04-06 08:24:12.840 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410]   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
04-06 08:24:12.840 18999-18999/com.Test2.Project2 A/art: art/runtime/java_vm_ext.cc:410] 
04-06 08:24:12.840 18999-19006/com.Test2.Project2 W/art: Suspending all threads took: 38.697ms
04-06 08:24:13.103 18999-18999/com.Test2.Project2 A/art: art/runtime/runtime.cc:399] Runtime aborting...
04-06 08:24:13.103 18999-18999/com.Test2.Project2 A/art: art/runtime/runtime.cc:399] Aborting thread:

04-06 08:24:13.107 18999-18999/com.Test2.Project2 A/libc: Fatal signal 6 (SIGABRT), code -6 in tid 18999

【问题讨论】：

标签： android multithreading delphi

【解决方案1】：

您没有充分保护线程的FBitmap 对象。

当线程调用SetGetImage(nil, False)时，TCriticalSection被锁定，然后在SetGetImage()退出之前解锁，因此当Assign()'ed到BitmSurface时对FBitmap的访问不会被锁定。这意味着主线程可以修改FBitmap，而BitmSurface 仍在忙于复制它。

试试类似的方法：

procedure TFormMain.CameraComponent1SampleBufferReady(Sender: TObject;
  const ATime: TMediaTime);
begin
  CameraComponent1.SampleBufferToBitmap(BabyImag.Bitmap, True);
  Log.d('DBBaby', nil, 'Image on Screen');
  if SendVideo then
    FCommThread.SetImage(BabyImag.Bitmap);
end;

type
  TComThread = class(TThread)
  private
    { Some code }
    procedure GetImage(ASurface: TBitmapSurface);
  protected
    procedure Execute; override;
  public 
    Constructor Create(UserType: Integer);
    { Some code }
    function SetImage(AImage: TBitmap);
  end;

implementation

constructor TComThread.Create(UserType: Integer);
begin
  inherited Create(True);
  { Some code }
  FImage := TBitmap.Create;
end;

procedure TComThread.Execute;
var
  BitmSurface: TBitmapSurface;
  ToJPEG: TBitmapCodecManager;
  quality: TBitmapCodecSaveParams;
  CameraImg: TMemoryStream;
begin
  BitmSurface := TBitmapSurface.Create;
  ToJPEG := TBitmapCodecManager.Create;
  quality.Quality := 50;
  try
    while SendBabyVideo do
    begin
      try
        GetImage(BitmSurface);
        Log.d('DBBaby', nil, 'SurfWidth ' + IntToStr(BitmSurface.Width));
        if (BitmSurface.Width > 0) and (BitmSurface.Height > 0) then
        begin
          // Image stream ready
          CameraImg.Clear;
          try
            ToJPEG.SaveToStream(CameraImg, BitmSurface, '.jpg', @quality);
            CamSize := CameraImg.Size;
            SetLength(bffrImg, CamSize+8);
            bffrImg[0] := $FF;
            bffrImg[1] := $FF;
            bffrImg[2] := $16;
            bffrImg[3] := $09;
            bffrImg[4] := byte(CamSize);
            bffrImg[5] := byte(CamSize shr 8);
            bffrImg[6]:= byte(CamSize shr 16);
            bffrImg[7]:= byte(CamSize shr 24);

            CameraImg.Position := 0;
            CameraImg.ReadBuffer(bffrImg[8], CamSize);
          finally
            CameraImg.Clear;
          end;

          Log.d('DBBaby', nil, 'Imagem total: '+IntToStr(Length(bffrImg)));
        end;
      except
        on E: Exception do
        begin
          Log.d('DBBaby', nil, '------------------------ GET STREAM');
          Log.d('DBBaby', nil, E.Message);
        end;
      end;

      try
        if (PeerIP <> '') and (PeerIP <> '255.255.255.255') and
           (bffr <> nil) and (bffrImg <> nil) then
        begin
          FUDPBABY.SendBuffer(PeerIP, PeerPort, TIdIPVersion.Id_IPv4, bffr);
          FUDPBABY.SendBuffer(PeerIP, PeerPort, TIdIPVersion.Id_IPv4, bffrImg);
        end;
      except
        on E: Exception do
        begin
          Log.d('DBBaby', nil, '------------------------ SEND STREAM');
          Log.d('DBBaby', nil, E.Message);
        end;
      end;
    end;
  finally
    CameraImg.Free;
    ToJPEG.Free;
    BitmSurface.Free;
  end;
end;

procedure TComThread.GetImage(ASurface: TBitmapSurface);
begin
  TMonitor.Enter(FImage);
  try
    ASurface.Assign(FImage);
  finally
    TMonitor.Exit(FImage);
  end;
end;

procedure TComThread.SetImage(AImage: TBitmap);
begin
  TMonitor.Enter(FImage);
  try
    FImage.Assign(AImage);
  finally
    TMonitor.Exit(FImage);
  end;
end;

【讨论】：

嗨 Remy，我已经尝试了你的代码，但仍然收到致命信号 6，请参阅日志：