Android app goes to black or white screen when you rotate

[Gareth Murfin]

I have noticed a few times if my phone rotates my app just disappears and a white or black screen appears instead. This also happens when I receive a phone call when using my app, what could I be doing wrong? it looks like the activity should just reappear but it doesn't. 

If I use advanced task killer then flip back to the app it reloads and works, until I rotate the screen and it goes to the black screen again...

[Shai Almog]

I'm guessing you got an exception or an infinite loop.

[Gareth Murfin]

Oh yes, I wouldnt have noticed that! .. weird error!! Whats this about, im not even showing a modal..

[EDT] 0:0:6,320 - java.lang.NullPointerException

[EDT] 0:0:6,323 - java.lang.NullPointerException

     at com.codename1.impl.android.AndroidImplementation.getNativeGraphics(AndroidImplementation.java:1033)

     at com.codename1.ui.Display.edtLoopImpl(Display.java:997)

     at com.codename1.ui.Display.flushEdt(Display.java:813)

     at com.codename1.ui.Form.showModal(Form.java:1400)

     at com.codename1.ui.Dialog.showModal(Dialog.java:1085)

     at com.codename1.ui.Form.showDialog(Form.java:1497)

     at com.codename1.ui.Form.showModal(Form.java:1484)

     at com.codename1.ui.Dialog.showImpl(Dialog.java:1043)

     at com.codename1.ui.Dialog.show(Dialog.java:1027)

     at com.codename1.ui.Dialog.show(Dialog.java:985)

     at com.codename1.ui.Dialog.show(Dialog.java:774)

     at com.codename1.ui.Dialog.show(Dialog.java:727)

     at com.codename1.ui.Dialog.show(Dialog.java:692)

     at com.codename1.ui.Dialog.show(Dialog.java:536)

     at com.codename1.ui.Dialog.show(Dialog.java:788)

     at com.codename1.ui.Display.mainEDTLoop(Display.java:908)

     at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:120)

     at com.codename1.impl.CodenameOneThread$1.run(CodenameOneThread.java:60)

     at java.lang.Thread.run(Thread.java:864)

[Shai Almog]

This means there was an exception while the app was deinitialized and we are trying to show the exception dialog. Is there additional output before that?

[Gareth Murfin]

I/System.out(16340): showKeyboard false

W/System.err(16340): java.lang.NullPointerException

W/System.err(16340):    at com.codename1.impl.android.AndroidImplementation.confirmControlView(AndroidImplementation.java:568)

W/System.err(16340):    at com.codename1.ui.Display.setCurrentForm(Display.java:1374)

W/System.err(16340):    at com.codename1.ui.Display.setCurrent(Display.java:1319)

W/System.err(16340):    at com.codename1.ui.Form.show(Form.java:1297)

W/System.err(16340):    at com.codename1.ui.Form.show(Form.java:1275)

W/System.err(16340):    at com.sasol.fuelapp.Sasol.start(Sasol.java:17)

W/System.err(16340):    at com.sasol.fuelapp.SasolStub.run(SasolStub.java:119)

W/System.err(16340):    at com.codename1.ui.Display.processSerialCalls(Display.java:1075)

W/System.err(16340):    at com.codename1.ui.Display.mainEDTLoop(Display.java:897)

W/System.err(16340):    at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:120)

W/System.err(16340):    at com.codename1.impl.CodenameOneThread$1.run(CodenameOneThread.java:60)

W/System.err(16340):    at java.lang.Thread.run(Thread.java:864)

W/ResourceType(16340): No package identifier when getting value for resource number 0x00000000

W/System.err(16340): java.lang.NullPointerException

W/System.err(16340):    at com.codename1.impl.android.AndroidImplementation.getNativeGraphics(AndroidImplementation.java:1033)

W/System.err(16340):    at com.codename1.ui.Display.edtLoopImpl(Display.java:997)

W/System.err(16340):    at com.codename1.ui.Display.flushEdt(Display.java:813)

W/System.err(16340):    at com.codename1.ui.Form.showModal(Form.java:1400)

W/System.err(16340):    at com.codename1.ui.Dialog.showModal(Dialog.java:1085)

W/System.err(16340):    at com.codename1.ui.Form.showDialog(Form.java:1497)

W/System.err(16340):    at com.codename1.ui.Form.showModal(Form.java:1484)

W/System.err(16340):    at com.codename1.ui.Dialog.showImpl(Dialog.java:1043)

W/System.err(16340):    at com.codename1.ui.Dialog.show(Dialog.java:1027)

W/System.err(16340):    at com.codename1.ui.Dialog.show(Dialog.java:985)

W/System.err(16340):    at com.codename1.ui.Dialog.show(Dialog.java:774)

W/System.err(16340):    at com.codename1.ui.Dialog.show(Dialog.java:727)

W/System.err(16340):    at com.codename1.ui.Dialog.show(Dialog.java:692)

W/System.err(16340):    at com.codename1.ui.Dialog.show(Dialog.java:536)

W/System.err(16340):    at com.codename1.ui.Dialog.show(Dialog.java:788)

W/System.err(16340):    at com.codename1.ui.Display.mainEDTLoop(Display.java:908)

W/System.err(16340):    at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:120)

W/System.err(16340):    at com.codename1.impl.CodenameOneThread$1.run(CodenameOneThread.java:60)

W/System.err(16340):    at java.lang.Thread.run(Thread.java:864)

D/Sasol   (16340): [EDT] 0:0:13,828 - java.lang.NullPointerException

I/Codename One(16340): Resource not found: methodData.dat

D/Sasol   (16340): [EDT] 0:0:13,832 - java.lang.NullPointerException

D/Sasol   (16340):      at com.codename1.impl.android.AndroidImplementation.getNativeGraphics(AndroidImplementation.java:1033)

D/Sasol   (16340):      at com.codename1.ui.Display.edtLoopImpl(Display.java:997)

D/Sasol   (16340):      at com.codename1.ui.Display.flushEdt(Display.java:813)

D/Sasol   (16340):      at com.codename1.ui.Form.showModal(Form.java:1400)

D/Sasol   (16340):      at com.codename1.ui.Dialog.showModal(Dialog.java:1085)

D/Sasol   (16340):      at com.codename1.ui.Form.showDialog(Form.java:1497)

D/Sasol   (16340):      at com.codename1.ui.Form.showModal(Form.java:1484)

D/Sasol   (16340):      at com.codename1.ui.Dialog.showImpl(Dialog.java:1043)

D/Sasol   (16340):      at com.codename1.ui.Dialog.show(Dialog.java:1027)

D/Sasol   (16340):      at com.codename1.ui.Dialog.show(Dialog.java:985)

D/Sasol   (16340):      at com.codename1.ui.Dialog.show(Dialog.java:774)

D/Sasol   (16340):      at com.codename1.ui.Dialog.show(Dialog.java:727)

D/Sasol   (16340):      at com.codename1.ui.Dialog.show(Dialog.java:692)

D/Sasol   (16340):      at com.codename1.ui.Dialog.show(Dialog.java:536)

D/Sasol   (16340):      at com.codename1.ui.Dialog.show(Dialog.java:788)

D/Sasol   (16340):      at com.codename1.ui.Display.mainEDTLoop(Display.java:908)

D/Sasol   (16340):      at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:120)

D/Sasol   (16340):      at com.codename1.impl.CodenameOneThread$1.run(CodenameOneThread.java:60)

D/Sasol   (16340):      at java.lang.Thread.run(Thread.java:864)

D/qdmemalloc(  215): ion: Allocated buffer base:0x44b01000 size:8355840 fd:47

D/qdmemalloc(  215): ion: Allocated buffer base:0x4002a000 size:4096 fd:34

[Gareth Murfin]

PS on iphone it doesnt seem to crash when rotating, nor on simulator

[Chen Fishbein]

 this is very strange, did you built the app with our build server? is it possible you manually changed the manifest?

does a simple hello world app also causes this exception for you?

[Gareth Murfin]

I used the cloud (no changes to manifest at all- I think ive specified some android hints in netbeans tho) , I dont think it used to happen to be honest as I remember showing off my app in the way that it could rotate and work on any screen, so its either something I have added or something you guys have added. I wish I did have the build server working locally as I could then pin point the exact line but I havent had time to set it up yet.

Earlier on in my code if I enable the EDT detector I see some fairly serious looking messages complaining about when I show forms, Im wondering if its something like that, or maybe something in the transition stuff, I dont know, seems to happen in all points within my app which is confusing. 

I doubt very much whether a hello world app will exhibit this but I will do some tests tommorrow and get back to you. 

Thanks for the support,

Gaz.

On 6 January 2014 23:03, Chen Fishbein <cf2...@gmail.com> wrote:

 this is very strange, did you built the app with our build server? is it possible you manually changed the manifest?

does a simple hello world app also causes this exception for you?

--
You received this message because you are subscribed to a topic in the Google Groups "CodenameOne Discussions" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/codenameone-discussions/r621ZSZhELc/unsubscribe.
To unsubscribe from this group and all its topics, send an email to codenameone-discu...@googlegroups.com.
Visit this group at http://groups.google.com/group/codenameone-discussions.

To view this discussion on the web visit https://groups.google.com/d/msgid/codenameone-discussions/3bcc5c82-04ba-4c91-8f6f-28510127e0be%40googlegroups.com.

For more options, visit https://groups.google.com/groups/opt_out.

--

Gareth Murfin
(Android Freelancer - www.garethmurfin.co.uk)

[Gareth Murfin]

Im still having this problem, I cannot figure it out at all, any suggestions?? would it help if I sent my Jar file or something to you guys?

Help would be appreciated, thanks guys.

On Tuesday, January 7, 2014 7:48:18 AM UTC+8, Gareth Murfin wrote:

I used the cloud (no changes to manifest at all- I think ive specified some android hints in netbeans tho) , I dont think it used to happen to be honest as I remember showing off my app in the way that it could rotate and work on any screen, so its either something I have added or something you guys have added. I wish I did have the build server working locally as I could then pin point the exact line but I havent had time to set it up yet.

Earlier on in my code if I enable the EDT detector I see some fairly serious looking messages complaining about when I show forms, Im wondering if its something like that, or maybe something in the transition stuff, I dont know, seems to happen in all points within my app which is confusing. 

I doubt very much whether a hello world app will exhibit this but I will do some tests tommorrow and get back to you. 

Thanks for the support,

Gaz.

On 6 January 2014 23:03, Chen Fishbein <cf2...@gmail.com> wrote:

 this is very strange, did you built the app with our build server? is it possible you manually changed the manifest?

does a simple hello world app also causes this exception for you?

--
You received this message because you are subscribed to a topic in the Google Groups "CodenameOne Discussions" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/codenameone-discussions/r621ZSZhELc/unsubscribe.

To unsubscribe from this group and all its topics, send an email to codenameone-discussions+unsub...@googlegroups.com.

Visit this group at http://groups.google.com/group/codenameone-discussions.

To view this discussion on the web visit https://groups.google.com/d/msgid/codenameone-discussions/3bcc5c82-04ba-4c91-8f6f-28510127e0be%40googlegroups.com.

For more options, visit https://groups.google.com/groups/opt_out.

[Shai Almog]

You said that you would try to reproduce it as standalone app. A jar wouldn't help us, we need an actual testcase.

[Gareth Murfin]

A helloworld app doesnt crash like this (just tested on my device), it must be something in my code, but theres 30,000 lines of it, can you give me a hint what might cause this?

[Gareth Murfin]

(14982): [EDT] 0:6:56,159 - java.lang.NullPointerException

(14982): [EDT] 0:6:56,162 - java.lang.NullPointerException

(14982):      at com.codename1.impl.android.AndroidImplementation.confirmControlView(AndroidImplementation.java:569)

(14982):      at com.codename1.ui.Display.setCurrentForm(Display.java:1374)

(14982):      at com.codename1.ui.Display.setCurrent(Display.java:1319)

(14982):      at com.codename1.ui.Form.showModal(Form.java:1468)

(14982):      at com.codename1.ui.Dialog.showModal(Dialog.java:1085)

(14982):      at com.codename1.ui.Form.showDialog(Form.java:1497)

(14982):      at com.codename1.ui.Form.showModal(Form.java:1484)

(14982):      at com.codename1.ui.Dialog.showImpl(Dialog.java:1043)

(14982):      at com.codename1.ui.Dialog.show(Dialog.java:1027)

(14982):      at com.codename1.ui.Dialog.show(Dialog.java:985)

(14982):      at com.codename1.ui.Dialog.show(Dialog.java:774)

(14982):      at com.codename1.ui.Dialog.show(Dialog.java:727)

(14982):      at com.codename1.ui.Dialog.show(Dialog.java:692)

(14982):      at com.codename1.ui.Dialog.show(Dialog.java:536)

(14982):      at com.codename1.ui.Dialog.show(Dialog.java:788)

(14982):      at com.codename1.ui.Display.mainEDTLoop(Display.java:938)

(14982):      at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:120)

(14982):      at com.codename1.impl.CodenameOneThread$1.run(CodenameOneThread.java:60)

(14982):      at java.lang.Thread.run(Thread.java:864)

[Gareth Murfin]

a bit more details from my phone 

/System.err(17216): java.lang.NullPointerException

/qdmemalloc(  923): ion: Mapped buffer base:0x63c5f000 size:4096 offset:0 fd:79

/System.err(17216):    at com.codename1.impl.android.AndroidImplementation.confirmControlView(AndroidImplementation.java:569)

/System.err(17216):    at com.codename1.ui.Display.setCurrentForm(Display.java:1374)

/System.err(17216):    at com.codename1.ui.Display.setCurrent(Display.java:1319)

/System.err(17216):    at com.codename1.ui.Form.show(Form.java:1297)

/System.err(17216):    at com.codename1.ui.Form.show(Form.java:1275)

/System.err(17216):    at com.sasol.fuelapp.Sasol.start(Sasol.java:17)

/System.err(17216):    at com.sasol.fuelapp.SasolStub.run(SasolStub.java:119)

/System.err(17216):    at com.codename1.ui.Display.processSerialCalls(Display.java:1075)

/System.err(17216):    at com.codename1.ui.Display.mainEDTLoop(Display.java:897)

/System.err(17216):    at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:120)

/System.err(17216):    at com.codename1.impl.CodenameOneThread$1.run(CodenameOneThread.java:60)

/System.err(17216):    at java.lang.Thread.run(Thread.java:864)

/ResourceType(17216): No package identifier when getting value for resource number 0x00000000

/TELEPHONY_CALLBACK(  923): @onSignalStrengthChanged: SignalStrength: 21 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 gsm|lte

/StatusBar.NetworkController(  923): dumpState[hasService=true ServiceState=0 home Far EasTone Far EasTone 46601  UMTS CSS not supported -1 -1 RoamInd=-1 DefRoamInd=-1EriInd=

-1EriMode= -1RadioPowerSv: false EmergOnly=false PhoneType: 1 IsCdma=false SimState=UNKNOWN GprsState=0 DataState=Not supported data state:-1 DataActivity=NONE NetworkType=UM

S HtcModemLinkOn=false sku_id=73]

/SIGNAL_ICON(  923): updateTelephonySignalStrength

/SILENT_RESET(  923): property=0 mSilentReset=false

/SIGNAL_ICON(  923): mapTelephonySignalStrength

/SIGNAL_ICON(  923): maxLevel=5 asu=21 networkType=UMTS

/SIGNAL_ICON(  923): return iconLevel=5

/StatusBar.NetworkController(  923): dumpIconState[dataVisible=false dataIconId=(null) signalIconId=stat_sys_5signal_5 lastSignalLevel=5 wifiVisible=true wifiIconId=stat_sys_

ifi_signal_4 simCardVisible=false simCardIconId=(null) airplaneMode=false femotcellVisible=false femtocellIconId=(null)]

/System.err(17216): java.lang.NullPointerException

/System.err(17216):    at com.codename1.impl.android.AndroidImplementation.getNativeGraphics(AndroidImplementation.java:1034)

/System.err(17216):    at com.codename1.ui.Display.edtLoopImpl(Display.java:997)

/System.err(17216):    at com.codename1.ui.Display.flushEdt(Display.java:813)

/System.err(17216):    at com.codename1.ui.Form.showModal(Form.java:1400)

/System.err(17216):    at com.codename1.ui.Dialog.showModal(Dialog.java:1085)

/System.err(17216):    at com.codename1.ui.Form.showDialog(Form.java:1497)

/System.err(17216):    at com.codename1.ui.Form.showModal(Form.java:1484)

/System.err(17216):    at com.codename1.ui.Dialog.showImpl(Dialog.java:1043)

/System.err(17216):    at com.codename1.ui.Dialog.show(Dialog.java:1027)

/System.err(17216):    at com.codename1.ui.Dialog.show(Dialog.java:985)

/System.err(17216):    at com.codename1.ui.Dialog.show(Dialog.java:774)

/System.err(17216):    at com.codename1.ui.Dialog.show(Dialog.java:727)

/System.err(17216):    at com.codename1.ui.Dialog.show(Dialog.java:692)

/System.err(17216):    at com.codename1.ui.Dialog.show(Dialog.java:536)

/System.err(17216):    at com.codename1.ui.Dialog.show(Dialog.java:788)

/System.err(17216):    at com.codename1.ui.Display.mainEDTLoop(Display.java:908)

/System.err(17216):    at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:120)

/System.err(17216):    at com.codename1.impl.CodenameOneThread$1.run(CodenameOneThread.java:60)

/System.err(17216):    at java.lang.Thread.run(Thread.java:864)

/Sasol   (17216): [EDT] 0:0:7,419 - java.lang.NullPointerException

/Codename One(17216): Resource not found: methodData.dat

/Sasol   (17216): [EDT] 0:0:7,422 - java.lang.NullPointerException

/Sasol   (17216):      at com.codename1.impl.android.AndroidImplementation.getNativeGraphics(AndroidImplementation.java:1034)

/Sasol   (17216):      at com.codename1.ui.Display.edtLoopImpl(Display.java:997)

/Sasol   (17216):      at com.codename1.ui.Display.flushEdt(Display.java:813)

/Sasol   (17216):      at com.codename1.ui.Form.showModal(Form.java:1400)

/Sasol   (17216):      at com.codename1.ui.Dialog.showModal(Dialog.java:1085)

/Sasol   (17216):      at com.codename1.ui.Form.showDialog(Form.java:1497)

/Sasol   (17216):      at com.codename1.ui.Form.showModal(Form.java:1484)

/Sasol   (17216):      at com.codename1.ui.Dialog.showImpl(Dialog.java:1043)

/Sasol   (17216):      at com.codename1.ui.Dialog.show(Dialog.java:1027)

/Sasol   (17216):      at com.codename1.ui.Dialog.show(Dialog.java:985)

/Sasol   (17216):      at com.codename1.ui.Dialog.show(Dialog.java:774)

/Sasol   (17216):      at com.codename1.ui.Dialog.show(Dialog.java:727)

/Sasol   (17216):      at com.codename1.ui.Dialog.show(Dialog.java:692)

/Sasol   (17216):      at com.codename1.ui.Dialog.show(Dialog.java:536)

/Sasol   (17216):      at com.codename1.ui.Dialog.show(Dialog.java:788)

/Sasol   (17216):      at com.codename1.ui.Display.mainEDTLoop(Display.java:908)

/Sasol   (17216):      at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:120)

/Sasol   (17216):      at com.codename1.impl.CodenameOneThread$1.run(CodenameOneThread.java:60)

/Sasol   (17216):      at java.lang.Thread.run(Thread.java:864)

/qdmemalloc(  213): ion: Allocated buffer base:0x44b2b000 size:8355840 fd:39

[Gareth Murfin]

Seems to be hitting the null pointer at fis.close(); inside createImage() of AndroidImplementation

Another time it seems to be a null pointer doing Display display = Display.getInstance();

I know it only recently started doing this, possibly in the last 3 weeks, so it must be something ive added but I cannot for the life of me figure out what it is, and its android specific too...

[Gareth Murfin]

Well I managed to narrow it down ,  when you rotate it crashes if you have 

android.targetSDKVersion  = 14

I changed it to android.targetSDKVersion  = 9 and it wont crash on rotate now (but then that pointless black button with 3 dots on it appears at the bottom of my app!)

This actually happens on a fresh hello world version of the app so Im guessing its a bug in cn1 somewhere.

[Chen Fishbein]

Thanks! that was very helpful, I found the issue it's because of this:

http://stackoverflow.com/questions/16758414/ondestroy-is-called-on-rotation-despite-configchanges-setting

The rotation called destroy on your Activity and messed things up, I'll commit a fix for this.

[Gareth Murfin]

Excellent! So awesome that things get done so fast around here in CN1 land :))) Thanks a lot, android is a funny beast eh!

--

You received this message because you are subscribed to a topic in the Google Groups "CodenameOne Discussions" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/codenameone-discussions/r621ZSZhELc/unsubscribe.

To unsubscribe from this group and all its topics, send an email to codenameone-discu...@googlegroups.com.

Visit this group at http://groups.google.com/group/codenameone-discussions.

To view this discussion on the web visit https://groups.google.com/d/msgid/codenameone-discussions/497e0dc1-bf44-4882-b87b-9d7bd989d7a4%40googlegroups.com.

For more options, visit https://groups.google.com/groups/opt_out.

[Chen Fishbein]

it's my favorite beast, easy to debug and to develop not like the other platforms.

[Gareth Murfin]

true, with a device plugged in it feels really fast to test a build and see the feedback, I trust you have seen genymotion.com ? 

On 15 January 2014 22:45, Chen Fishbein <cf2...@gmail.com> wrote:

it's my favorite beast, easy to debug and to develop not like the other platforms.

--

You received this message because you are subscribed to a topic in the Google Groups "CodenameOne Discussions" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/codenameone-discussions/r621ZSZhELc/unsubscribe.
To unsubscribe from this group and all its topics, send an email to codenameone-discu...@googlegroups.com.
Visit this group at http://groups.google.com/group/codenameone-discussions.

To view this discussion on the web visit https://groups.google.com/d/msgid/codenameone-discussions/85b13114-8b13-410e-b6fb-ba3bbd9bbb95%40googlegroups.com.

For more options, visit https://groups.google.com/groups/opt_out.

[Chen Fishbein]

yes, that's a cool product, I still prefer the device.

[Gareth Murfin]

So was this fixed? can I use android.targetSDKVersion  = 14 without my app crashing on rotate? :-)

[Chen Fishbein]

it's fixed.

[rmurr...@gmail.com]