TextArea: frozen/exception

[Ivan]

Hi guys,

I have a problem with TextArea. The behaviour is "occasional" but I'm able to reproduce it. There are two cases:

1. when I write quickly sometimes it throws exception (see stack trace below)

2. when text exceeds displayed rows of TA (starts scrolling up) and I click into area between keyboard and dialog (see test code below) keyboard disappears (it's OK) but sometimes application freezes (see screenshot attached).

Is it something with my code or is it a bug? I'm testing on Android 4.1.2 (Sony Xperia SP), 4.2.2. (Google Nexus 7)

Test code:

Container noteCont = new Container(new BoxLayout(BoxLayout.Y_AXIS));

TextArea ta = new TextArea();

ta.setGrowByContent(true);

ta.setSingleLineTextArea(false);

ta.setRows(5);

ta.setColumns(50);

ta.setMaxSize(8000);

noteCont.addComponent(ta);

Dialog dlg = new Dialog("Note");

dlg.placeButtonCommands(new Command[]{new Command("OK")});

dlg.addComponent(noteCont);

dlg.setBackCommand(new Command("Cancel"));

dlg.showDialog();

Stack trace:

[EDT] 0:0:21,641 - java.lang.NullPointerException
[EDT] 0:0:21,658 - java.lang.NullPointerException
	at com.codename1.ui.TextArea.initRowString(TextArea.java:954)
	at com.codename1.ui.TextArea.getRowStrings(TextArea.java:667)
	at com.codename1.ui.TextArea.getLines(TextArea.java:681)
	at com.codename1.ui.plaf.DefaultLookAndFeel.getTextAreaSize(DefaultLookAndFeel.java:860)
	at com.codename1.ui.TextArea.calcScrollSize(TextArea.java:1023)
	at com.codename1.ui.Component.getScrollDimension(Component.java:542)
	at com.codename1.ui.TextArea.isScrollableY(TextArea.java:521)
	at com.codename1.ui.Component.isScrollable(Component.java:1373)
	at com.codename1.ui.Component.internalPaintImpl(Component.java:995)
	at com.codename1.ui.Component.paintInternalImpl(Component.java:984)
	at com.codename1.ui.Component.paintInternal(Component.java:967)
	at com.codename1.ui.Component.paintInternal(Component.java:935)
	at com.codename1.ui.Component.paintComponent(Component.java:1202)
	at com.codename1.ui.Component.paintComponent(Component.java:1154)
	at com.codename1.impl.CodenameOneImplementation.paintDirty(CodenameOneImplementation.java:370)
	at com.codename1.ui.Display.edtLoopImpl(Display.java:917)
	at com.codename1.ui.Display.invokeAndBlock(Display.java:1048)
	at com.codename1.ui.Display.invokeAndBlock(Display.java:1083)
	at com.codename1.impl.android.InPlaceEditView.waitForEditCompletion(InPlaceEditView.java:344)
	at com.codename1.impl.android.InPlaceEditView.edit(InPlaceEditView.java:465)
	at com.codename1.impl.android.AndroidImplementation.editString(AndroidImplementation.java:410)
	at com.codename1.ui.Display.editString(Display.java:1352)
	at com.codename1.ui.Display.editString(Display.java:1323)
	at com.codename1.ui.TextArea.editString(TextArea.java:541)
	at com.codename1.ui.TextArea.pointerReleased(TextArea.java:574)
	at com.codename1.ui.Form.pointerReleased(Form.java:2129)
	at com.codename1.ui.Dialog.pointerReleased(Dialog.java:1680)
	at com.codename1.ui.Component.pointerReleased(Component.java:2241)
	at com.codename1.ui.Display.handleEvent(Display.java:1709)
	at com.codename1.ui.Display.edtLoopImpl(Display.java:913)
	at com.codename1.ui.Display.invokeAndBlock(Display.java:1048)
	at com.codename1.ui.Display.invokeAndBlock(Display.java:1083)
	at com.codename1.ui.Form.showModal(Form.java:1398)
	at com.codename1.ui.Dialog.showModal(Dialog.java:1074)
	at com.codename1.ui.Dialog.show(Dialog.java:465)
	at com.codename1.ui.Dialog.showPackedImpl(Dialog.java:1351)
	at com.codename1.ui.Dialog.showPacked(Dialog.java:1262)
	at com.codename1.ui.Dialog.showImpl(Dialog.java:1034)
	at com.codename1.ui.Dialog.show(Dialog.java:1016)
	at com.codename1.ui.Dialog.showDialog(Dialog.java:1413)
	at userclasses.StateMachine.onMain_ButtonAction(StateMachine.java:61)
	at generated.StateMachineBase.handleComponentAction(StateMachineBase.java:320)
	at com.codename1.ui.util.UIBuilder$FormListener.actionPerformed(UIBuilder.java:2628)
	at com.codename1.ui.util.EventDispatcher.fireActionSync(EventDispatcher.java:383)
	at com.codename1.ui.util.EventDispatcher.fireActionEvent(EventDispatcher.java:326)
	at com.codename1.ui.Button.fireActionEvent(Button.java:376)
	at com.codename1.ui.Button.released(Button.java:407)
	at com.codename1.ui.Button.pointerReleased(Button.java:495)
	at com.codename1.ui.Form.pointerReleased(Form.java:2129)
	at com.codename1.ui.Form.pointerReleased(Form.java:2076)
	at com.codename1.ui.Component.pointerReleased(Component.java:2241)
	at com.codename1.ui.Display.handleEvent(Display.java:1709)
	at com.codename1.ui.Display.edtLoopImpl(Display.java:913)
	at com.codename1.ui.Display.mainEDTLoop(Display.java:858)
	at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:119)
	at com.codename1.impl.CodenameOneThread$1.run(CodenameOneThread.java:60)
	at java.lang.Thread.run(Thread.java:856)

[Shai Almog]

Hi,
seems like a serious bug. Can you file an issue with a test case, we will try to reproduce it. Thanks!

[Ivan]

issue created: https://code.google.com/p/codenameone/issues/detail?id=798

[Gareth Murfin]

Im coming across this too cannot find a fix.

On Tuesday, July 23, 2013 3:36:00 PM UTC+8, Ivan wrote:

issue created: https://code.google.com/p/codenameone/issues/detail?id=798

[Gareth Murfin]

a small sleep seems to fix it, i guess its a thread error on my side, accessing same object at same time, curiously I tried synchronizing etc with no luck

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[Shai Almog]

Synchronization won't help since we access the state internally. You need to use callSerially.