Error:(30, 13) Failed to resolve: com.android.support.constraint:constraint-layout:1.0.0-alpha4

Question

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try upgrading your gradle. read more at http://stackoverflow.com/questions/37992187/gradle-sync-failed-could-not-find-constraint-layout1-0-0-alpha2 — ישו אוהב אותך, Jul 19 '16 at 08:08
You have to have Android Studio 2.2 Preview to use ConstraintLayout, I'm getting the same error in android studio 2.1 — crgarridos, Jul 20 '16 at 09:23
Please look at that [answer](http://stackoverflow.com/a/40245159/4260491). Maybe will help you! ;) — BVantur, Oct 25 '16 at 16:36
In my case, the error is because "constraint-layout" was downloaded with a different md5 checksum. However, I found it still existed on my disk. So I just ignore the error and everything works fine. — cmoaciopm, Feb 09 '17 at 07:44

Henrique de Sousa · Answer 1 · 2016-08-05T09:22:45.783

13

I've found the fix:

Download Android Studio 2.2 Preview 7
Update SDK Tools to the latest 25.2.1
Download ConstraintLayout and Solver for ConstraintLayout in SDK Manager as per image below
Add com.android.support.constraint:constraint-layout:1.0.0-alpha5 to gradle.build

edited Aug 05 '16 at 09:22

answered Aug 03 '16 at 10:40

Henrique de Sousa

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I think SDK Tools version number should be 25.2.1 – Murat Erdogan Aug 04 '16 at 07:37
for historical purposes I left the old versions of the answer, but using AS2.2 and downloading the needed libs from Support Repository is enough. – Henrique de Sousa Sep 20 '16 at 14:13

score 6 · Answer 2 · answered Oct 02 '16 at 09:27

Well, I had the issue, that I updated the the ConstraintLayout and Solver dependecy like it was suggested it in the posts above. But still had the issue. My problem was, that the SDK Tools updated it to the latest version, in my case it was 1.0.0-alpha9, but in my gradle dependency was set to

compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha8'

So, you can change your gradle build file to

compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha9'

Or you check "Show package details" in the SDK Tools Editor and install your needed version. See screenshow below.

score 1 · Answer 3 · answered Sep 02 '16 at 17:15

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In Android Studio select: SDK Manager -> SDK Tools -> check 'com.android.support.constraint:constraint-layout:1.0.0-alpha4' in bottom of list and press 'OK' for installing this and updates, proposed by Android Studio.

answered Sep 02 '16 at 17:15

Polurival

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score 0 · Answer 4 · answered Oct 15 '19 at 13:45

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If nothing of this helps , Create a new android Project and check its build.gradle(module:app) and check for constraint compile/implementation. Copy that to your app build.gradle(module:app).

That should do the work :-)

answered Oct 15 '19 at 13:45

Shree

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Error:(30, 13) Failed to resolve: com.android.support.constraint:constraint-layout:1.0.0-alpha4

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