App crash when tried to hit back button

[krishna711]

Hi, Plugin is work fine but there is flaw in it. Sometimes it crash when we use back button or any button. Back button not blocked on some device as well. App crash allow user to open other apps in the device.

It there any fix for this issue?

[thaarok]

Hi, can you provide stacktrace or any debug info which would help to determine why has the app crashed?

[krishna711]

I can but not sure how to generate stacktrace for ionic app. When app crash it closed and nothing shows up. If you have any idea let me know so you I can provide relevant info.

[thaarok]

Run adb logcat command (from platform-tools in android sdk) while the device is connected in usb debug mode. Try to catch the exception which will arrive in the log when the application crash. https://developer.android.com/studio/command-line/logcat

[krishna711]

Thank you. I will check exception via this method. I noticed another issue. In one device, back button does not lock. Only home button, and option button lock. Back button always open to use. Device run on Android 5.0. Please check this issue as well.

[krishna711]

Attached logcat log during app crash. Device nexus, android 7.1.1 logcat.txt

[thaarok]

Can you send your /data/anr/traces.txt mentioned in your logcat.txt?

[thaarok]

Regarding the back button, open standalone issue and provide appropriate logcat output too please. (does "onKeyDown event: keyCode = ..." appear in the log?)

[krishna711]

Here traces.txt file. I will open standalone issue for back button and send logcat separately. Thanks traces.txt

[krishna711]

Did you find anything? Please update if possible. I can also send you apk file if needed. Also, I tried your demo app which works fine. The only difference I found is that demo app built in ionic version 1 while my app built on ionic 3. Other plugins list if that helps.

cordova-plugin-device 2.0.2 "Device" cordova-plugin-inappbrowser 3.0.0 "InAppBrowser" cordova-plugin-ionic-keyboard 2.0.5 "cordova-plugin-ionic-keyboard" cordova-plugin-ionic-webview 1.1.19 "cordova-plugin-ionic-webview" cordova-plugin-kiosk 0.2 "Cordova Kiosk Mode" cordova-plugin-splashscreen 5.0.2 "Splashscreen" cordova-plugin-whitelist 1.3.3 "Whitelist"

[thaarok]

Hi, sorry, provided logs has not give me any hint what could be the issue. If you can send reproducing app, it will be very helpful.

[krishna711]

Yes, attached apk file. It is simple quiz app. Quiz logic is coded in typescript and jquery. Nothing changed or customised on ionic or plugin level. Thanks a lot for help.

bizz-quiz.0.0.3.apk.zip

[thaarok]

It looks related to InAppBrowser: there is option hardwareback:

• value yes = back button take you back in history
• value no = back button will close the browser How exactly are you calling InAppBrowser?

[thaarok]

If you will not by able to fix it that way, as a workaround, you can implement custom back button handler in Ionic: https://ionicframework.com/docs/api/platform/Platform/#registerBackButtonAction

[krishna711]

Thanks a lot.. It worked. Do you have any idea on disable option/recent history button as well?

Thanks

[thaarok]

Kiosk plugin rely on fact its activity is only thing allowed on screen - when KioskActivity lost a focus, it kills all system dialogs. But InAppBrowser is non-system Dialog, which mean it is not killed, but when something tries to cover it (like recent apps menu), KioskActivity will not kill it as it has not focus already. Modified version of InAppBrowser plugin would be necessary. (Maybe could be provided as part of kiosk plugin directly...) Are you sure you need InAppBrowser? If the displayed web page is trusted, you can embed it in