java.lang.IllegalArgumentException: Can only use lower 16 bits for requestCode

Question

I am writing an application where Activity A launches Activity B using

startActivityForResult(intent, -101);

but when called, it responded back with following error log:

E/AndroidRuntime( 1708): java.lang.IllegalArgumentException: Can only use lower 16 bits for requestCode
E/AndroidRuntime( 1708):    at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:837)

Probably it could be -101 but I am not sure. Does any one have any idea on this?

Can only use lower 16 for requestCode : means request code should be >0 try startActivityForResult(intent, 101); — zapdroid, Aug 27 '14 at 14:30
Try this solution :https://stackoverflow.com/a/44271392/2267723 — Maher Abuthraa, Feb 05 '18 at 10:38

score 140 · Answer 1 · edited May 23 '17 at 12:18

140

You get this exception only in android.support.v4.app.FragmentActivity and not when you use android.app.Activity.

startActivityForResult() in FragmentActivity requires the requestCode to be of 16 bits, meaning the range is from 0 to 65535.

Also, validateRequestPermissionsRequestCode in FragmentActivity requires requestCode to be of 16 bits, meaning the range is from 0 to 65535.

For more info(if you want to see the source code) : https://stackoverflow.com/a/33331459/4747587

edited May 23 '17 at 12:18

Community

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answered Oct 25 '15 at 17:06

Henry

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Thanks Henry, this is a more complete answer – ramses Feb 03 '16 at 03:50

Saurabh Thorat · Answer 2 · 2021-06-09T13:15:29.900

89

If you're using ActivityResult APIs, add this dependency to fix this issue:

implementation "androidx.fragment:fragment:1.3.4"

edited Jun 09 '21 at 13:15

answered Jul 07 '20 at 12:35

Saurabh Thorat

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Thank you! You should really put this into a self-answered question so other people can find it easily. – LukeWaggoner Aug 07 '20 at 22:55
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somehow and I really do not know why. but, You should add these two dependencies together. implementation 'androidx.activity:activity-ktx:x.x.x' implementation 'androidx.fragment:fragment-ktx:x.x.x' – Mina Samir Aug 13 '20 at 02:39
Why they told us how many dependencies required to have new features? Google docs sucks! Thanks by the way for helping. – Maulik Dodia Dec 11 '20 at 11:57
No idea why the error isn't more specific. At any rate, thank you. My hero <3 – Victor Ude Mar 26 '21 at 21:19

vanomart · Answer 3 · 2017-10-09T08:12:55.567

35

It is also good to mention that this may happen if you use a number greater than 2^16 / 2 (which is 32768), so there's basically 2^15 options to not to screw this up.

Explanation: 16 bits can represent one of 65536 numbers, however, half of them are negative.

edited Oct 09 '17 at 08:12

answered Feb 28 '15 at 15:50

vanomart

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The limit is 65535 and not 32768. – Henry Oct 25 '15 at 17:08
@Henry Yes, negatif numbers are unused – Afrig Aminuddin Mar 29 '17 at 18:35

score 29 · Accepted Answer · edited Oct 25 '15 at 17:48

29

You need to pass a positive number to startActivityForResult.

edited Oct 25 '15 at 17:48

Eric Aya

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answered Aug 27 '14 at 14:32

Stephane Mathis

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Although this is true, answers below are more specific. +1 – Julius Jan 23 '19 at 20:00

Shaon · Answer 5 · 2021-02-04T05:59:27.120

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For those who are using the new ActivityResult API,

If you are using the new way (ActivityResult) to open new Activity.

registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { 
    result ->
}

you have to use both of the below dependency

implementation 'androidx.activity:activity-ktx:1.2.0-rc01'
implementation 'androidx.fragment:fragment-ktx:1.3.0-rc02'

edited Feb 04 '21 at 05:59

answered Oct 28 '20 at 17:49

Shaon

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It's kind of odd to use fragment implementation when not using it. But it works with it – Ivan Lopes Feb 04 '21 at 17:17
I think stable version will solve the problem – Shaon Feb 05 '21 at 09:32
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@Shaon i have to disappoint you.. they dont – Zacki Feb 24 '21 at 15:41
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This whole changes just messing things more and more. – Bitwise DEVS May 14 '21 at 08:08

ONE · Answer 6 · 2021-03-11T14:40:28.327

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You can only use lower 16 bits for requestCode means -- in binary terms -- you can use

0000000000000000 (16 bits) to 1111111111111111 (16 bits) [ binary ].

Or, equivalently

0 to 65535 [ base 10 ].

In decimal ("number") terms, this allows for 2^16 = 65536 combinations. Therefore, you can only use the numbers 0 all the way through 65535.

You also cannot use negative numbers.

edited Mar 11 '21 at 14:40

answered Sep 30 '16 at 10:52

ONE

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score 4 · Answer 7 · answered Sep 27 '18 at 08:30

The right answer is that you should use a 16 bits number for this purpose. The most safe solution for that is to always set your request code as short. If programmer attempts to write number more than 16 bits then the IDE won't let you to proceed because there will be an error.

score 2 · Answer 8 · answered Feb 28 '21 at 15:30

Just add the two main dependencies for activityforresult API

for kotlin

implementation 'androidx.activity:activity-ktx:1.3.0-alpha03'
implementation 'androidx.fragment:fragment-ktx:1.3.0'

for java

implementation 'androidx.activity:activity:1.3.0-alpha03'
implementation 'androidx.fragment:fragment:1.3.0'

check here for the latest version.

score 1 · Answer 9 · answered Apr 23 '21 at 13:13

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Just add

for kotlin

implementation 'androidx.fragment:fragment-ktx:1.3.3'

answered Apr 23 '21 at 13:13

Ivantsov Nick

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java.lang.IllegalArgumentException: Can only use lower 16 bits for requestCode

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