bluetooth keyboard will cause activity destroy and recreate

Question

Bluetooth keyboard will cause activity destroy and recreate if I turn off it or far away from pad(Android) Activity will be recreate how can i avoid this problem

help........................... – Chuang come fromTaiwan Sep 11 '14 at 00:53 — Chuang come fromTaiwan, Sep 11 '14 at 00:53

score 27 · Answer 1 · edited May 23 '17 at 11:54

27

In contrast to the accepted answer, I found that keyboard|keyboardHidden was not enough. I was working with a Logitech Bluetooth keyboard (model #JNZYR0021).

What did work was this:

<activity
  ...
  android:configChanges="orientation|screenSize|keyboard|keyboardHidden|navigation"
/>

Apparently this Logitech keyboard also changes navigation, which is weird because the Android docs say:

The navigation type (trackball/dpad) has changed. (This should never normally happen.)

Go figure.

edited May 23 '17 at 11:54

Community

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answered Dec 01 '14 at 22:56

nlawson

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i added the statement which you suggested, but native key board not opening for edittext which are in that activity. – Manikanta Ottiprolu Aug 18 '15 at 09:32
Thanks for you answer. It helped. – user2729200 Apr 21 '16 at 11:05
I spent weeks trying to find this issue. Touch when the customer fails to mention they were using a bluetooth keyboard. Thanks! – Stephen McCormick Jun 30 '16 at 23:45
Terrific.. How did you manage to know that navigation was changed? – hemanth kumar Feb 06 '17 at 11:22
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I also spent days trying to resolve this problem. Adding "keyboard|keyboardHidden|navigation" is what solved it for me. – J Avery Feb 26 '18 at 21:59
Using wireless mouse causes activity to recreate. adding navigation in configChanges solves the problem. – Programmer007 May 04 '23 at 05:49

score 19 · Accepted Answer · answered Sep 19 '14 at 22:12

19

Pairing a Bluetooth keyboard is considered to be a configuration change: Try adding the below to your AndroidManifest.xml

android:configChanges="keyboard|keyboardHidden"

From: http://developer.android.com/guide/topics/manifest/activity-element.html#config android:configChanges

answered Sep 19 '14 at 22:12

Schleir

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Helped with keyboard connected via USB as well. Thanks! – Natalia Jan 29 '19 at 07:41

score 0 · Answer 3 · answered Jun 30 '22 at 07:49

In my case, add keyboard|keyboardHidden|navigation is not enough, the Activity is still recreated. I tried to figure out a general way to find the reason to the configuration change.

The first thing need to do is add all of the cause of config change in the Activity's configChanges to make sure your Activity won't be recreated under your situation. Then override your Activity's method OnConfigurationChange(), use Configuration.diff() to calculate the difference between your newConfig and the current one(You can get it from getResources().getConfiguration()). The result is an decimal, transfer it to be a hexadecimal and calculate how is combined by the constants name starts with CONFIG_ in ActivityInfo.

For example, the configuration diff is 112 in decimal, and its hex is 0x70. In this case, we have CONFIG_KEYBOARD = 0x0010;, CONFIG_KEYBOARD_HIDDEN = 0x0020, CONFIG_NAVIGATION = 0x0040, which means these three flags are changed during this configuration change.

score 0 · Answer 4 · answered Nov 04 '22 at 20:43

For me, adding "orientation|screenSize|keyboard|keyboardHidden|navigation" to configChanges would still call onDestroy and onCreate of the activity. After a long research I found this article: https://developer.samsung.com/sdp/blog/en-us/2017/12/07/samsung-dex-lifecycle-on-switching-between-mobile-and-samsung-dex-mode

Basically, if you use Lenovo's productivity mode or Samsung DeX, it would recreate the app nonetheless, so it's necessary to add all of these if you want for the app to not recreate itself when you add a physical/bluetooth keyboard.:

<activity android:configChanges="orientation|screenSize|screenLayout|smallestScreenSize|uiMode|density">

Also, add this for Samsung DeX inside your AndroidManifest:

<meta-data 
android:name="com.samsung.android.keepalive.density" 
android:value="true" />

bluetooth keyboard will cause activity destroy and recreate

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