黑莓: "Application is not responding; process terminated"因为 UiApplication.getUiApplication().popScreen()？

Question

我有一个 Blackberry 应用程序，当它在一些支持触摸的模拟器(例如:9500、9520、9530、9550)中运行时，终止于:

“应用程序没有响应；进程 XPTO 终止”

使用日志，我发现应用程序似乎在我异步发出 HTTP 请求的类中停止:类似于:

public class LoadingFullScreen extends FullScreen implements Runnable {

    private Thread actionThread = null;

    protected void onDisplay() {
        actionThread = new Thread(this);
        actionThread.start();
    }

    protected void onUndisplay() {
        if(actionThread != null && actionThread.isAlive()) {
            actionThread.interrupt();
        }
    }

    public void run() {
        //make http requests - this is done successfully

        synchronized(Application.getEventLock()) {
                Screen active = UiApplication.getUiApplication().getActiveScreen();
                if (active instanceof LoadingFullScreen) {
                    Logger.debug("LoadingFullScreen popping screen"); //this appears in logs
                    UiApplication.getUiApplication().popScreen(active);
                    Logger.debug("LoadingFullScreen screen popped"); //this never appears in logs
                }
        }
    }
}

我使用 UiApplication.getUiApplication().pushModalScreen(new LoadingFullScreen()) 启动此屏幕

在日志中，我可以看到:

[0.0] Wed Jul 27 17:53:06 GMT 2011 - DEBUG: LoadingFullScreen popping screen
[0.0] JVM: bklt[1] @163148: JBSC on=0
[0.0] JVM: bklt[1] @163148: SC 0
[0.0] JVM: bklt[1]: setTimeout 30
[0.0] Application XPTO(212) is not responding; process terminated

好像 UiApplication.getUiApplication().popScreen()正在阻止应用程序，因此操作系统会终止应用程序，但为什么呢？

编辑:
我也试过使用

UiApplication.getUiApplication().invokeLater(new Runnable() {...} };            

而不是 synchronized(Application.getEventLock()) {...}但我有完全相同的结果

编辑 2:
我也试过 active.close()而不是 UiApplication.getUiApplication().popScreen(active);但我有完全相同的结果

编辑 3:
使用 javaloader我从模拟器中得到了这种堆栈跟踪:

guid:0x9C3CD62E3320B498 time: Thu Jul 28 15:02:50 2011  severity:0 type:3 app:Java Exception data:
    ForcedStackTraceException
    net_rim_services_impl(4) 27 2 0x1030B000
    net_rim_os-3(4BEF0320)
     HttpConnectionManager$CleanupThread
     run
     0x3B09
guid:0x9C3CD62E3320B498 time: Thu Jul 28 15:02:50 2011  severity:0 type:3 app:Java Exception data:
    ForcedStackTraceException
    XPTO(247) 60 4 0x124A0400
    net_rim_cldc-16(4BEEF8A5)
     TextField
     getFocusRect
     0x2A61
    net_rim_cldc-12(4BEEF8A5)
     Manager
     getFocusRect
     0x717
    net_rim_cldc-12(4BEEF8A5)
     Manager
     getFocusRect
     0x717
    net_rim_cldc-12(4BEEF8A5)
     Screen
     getFocusRect
     0x9AF2
    net_rim_cldc-12(4BEEF8A5)
     Screen
     callOnExposed
     0x9D16
    net_rim_cldc-13(4BEEF8A5)
     UiEngineImpl
     <private>
     0x9007
    net_rim_cldc-13(4BEEF8A5)
     UiEngineImpl
     removeScreen
     0x7D08
    net_rim_cldc-12(4BEEF8A5)
     Screen
     close
     0x6B66
    XPTO-8(4E316B06)
     LoadingFullScreen$1
     run
     0x34D5
    net_rim_cldc-8(4BEEF8A5)
     Application
     dispatchInvokeLater
     0x1A87
    net_rim_cldc-8(4BEEF8A5)
     Application
     <private>
     0x2809
    net_rim_cldc-8(4BEEF8A5)
     Application
     processNextMessage
     0x1AEF
    net_rim_cldc-9(4BEEF8A5)
     ModalEventThread
     run
     0xBE4F
guid:0x9C3CD62E3320B498 time: Thu Jul 28 15:02:50 2011  severity:0 type:3 app:Java Exception data:
    ForcedStackTraceException
    XPTO(247) 30 2 0x139DA800
    net_rim_cldc(4BEEF8A5)
     Object
     wait
     0x9922
    net_rim_cldc-8(4BEEF8A5)
     Application
     startModalEventThread
     0x1EB8
    net_rim_cldc-13(4BEEF8A5)
     UiEngineImpl
     addScreenModal
     0x83F4
    net_rim_cldc-13(4BEEF8A5)
     UiEngineImpl
     pushModalScreen
     0x674E
    net_rim_cldc-13(4BEEF8A5)
     UiApplication
     pushModalScreen
     0x62B0
    XPTO-8(4E316B06)
     MyBaseScreen
     <private>
     0x3AA6
    XPTO-8(4E316B06)
     MyBaseScreen
     openTheModalScreenFunction
     0x382C
    XPTO-8(4E316B06)
     MyBaseScreen$4
     fieldChanged
     0x4271
    net_rim_cldc-11(4BEEF8A5)
     Field
     fieldChangeNotify
     0x160B
    net_rim_cldc-16(4BEEF8A5)
     TextField
     replace
     0x7A5
    net_rim_cldc-16(4BEEF8A5)
     TextField
     inputMethodTextChanged
     0x24E1
    net_rim_cldc-15(4BEEF8A5)
     PasswordEditField
     inputMethodTextChanged
     0x4F26
    net_rim_cldc-27(4BEEF8A5)
     IMContext
     dispatchInputMethodEvent
     0x1E00
    net_rim_tid-4(4BEEF8E1)
     SLInputMethod
     sendComposedText
     0x5CA1
    net_rim_tid-4(4BEEF8E1)
     SLInputMethod
     sendComposedText
     0x5BD1
    net_rim_tid_fastEuropean(4BEF034C)
     FastEuropeanInputMethod
     sendComposedText
     0x48E1
    net_rim_tid_fastEuropean(4BEF034C)
     FastEuropeanInputMethod
     dispatchConversionEvent
     0x43E3
    net_rim_tid-4(4BEEF8E1)
     SLInputMethod
     dispatchKeyEvent
     0x5309
    net_rim_tid-4(4BEEF8E1)
     SLInputMethod
     dispatchEvent
     0x63CA
    net_rim_tid_fastEuropean(4BEF034C)
     FastEuropeanInputMethod
     dispatchEvent
     0x426E
    net_rim_cldc-27(4BEEF8A5)
     InputContext
     dispatchEvent
     0x3E15
    net_rim_cldc-27(4BEEF8A5)
     IMContext
     dispatchEvent
     0x21DE
    net_rim_cldc-11(4BEEF8A5)
     Field
     dispatchEvent
     0x3739
    net_rim_cldc-16(4BEEF8A5)
     TextField
     dispatchEvent
     0x30F6
    net_rim_cldc-27(4BEEF8A5)
     EventHandler
     <private>
     0x1460
    net_rim_cldc-27(4BEEF8A5)
     EventHandler
     processKeyEvent
     0x1A79
    net_rim_cldc-16(4BEEF8A5)
     TextField
     processKeyEvent
     0x37F6
    net_r

编辑 4:
我试图移动 run() LoadingFullScreen 中的方法到新 Runnable类(class)，因为有人告诉我有 LoadingFullScreen implement Runnable当该类显示为模式屏幕时，可能会导致问题。
但是，我没有运气，我仍然遇到同样的问题。
有任何想法吗？

编辑 5:
在这里解决: BlackBerry: "Application is not responding; process terminated" because of UiApplication.getUiApplication().popScreen()?

Answer 1

我记得有一次我遇到了几乎相同的问题。每当我试图通过获取事件线程的锁定来弹出屏幕时，应用程序就会崩溃。因此，与其获取事件线程的保持(锁定)，不如尝试使用 invokeLater() 在事件线程上进行同步。

UiApplication.getUiApplication().invokeLater(new Runnable()
{  
   public void run()
   {  

   }  
});