Gradle Sync failed could not find constraint-layout:1.0.0-alpha2

Question

Problem :

Error:Could not find com.android.support.constraint:constraint-layout:1.0.0-alpha2.
Required by:
myapp:app:unspecified

Background : Android Studio 2.2 P 1

Solution 1

Support libraries for ConstraintLayout could not be installed/updated.

Just open Preferences > Appearance & Behavior > System Settings > Android and move to SDK Tools tab. Check the following fields and install.

Solution 2

In my case, that support libraries for ConstraintLayout were installed, but I was adding the incorrect version of ConstraintLayout Library in my build.gradle file. In order to see what version have you installed, go to Preferences > Appearance & Behavior > System Settings > Android SDK. Now, click on SDK Tools tab in right pane. Check Show Package Details and take note of the version.

Finally you can add the correct version in the build.gradle file

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha9'
    testCompile 'junit:junit:4.12'
}

Solution 3

The fix is to update the android gradle plugin in your build.gradle.

This should work: classpath 'com.android.tools.build:gradle:2.2.0-alpha2'

Or you can use the latest: classpath 'com.android.tools.build:gradle:2.2.0-alpha3'

Solution 4

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. Image of SDK Tools

Solution 5

1. Ensure you have the maven.google.com repository declared in your module-level build.gradle file

   repositories { maven { url 'https://maven.google.com' } }

2.Add the library as a dependency in the same build.gradle file:

dependencies {
      compile 'com.android.support.constraint:constraint-layout:1.0.2'
}

View more solutions

Comments

[Than]

Be careful with using 2.2.0-alpha3 there is a bug with Toolbar on Android 4.x stackoverflow.com/questions/37812115/…

[Chris]

Thanks this worked for me. Gradle updated itself after popup but not the constraint dependency

[Antimonit]

For those who have these libraries installed but gradle is still complaining, check jmartinalonso's answer below. It is extending this answer.

[Sébastien]

Note: Preferences is actually File > Settings on Windows.

[Hareendra Chamara Philips]

In my case I couldn't find AndroidSDK as mentioned here .So I executed ./sdkmanager "extras;m2repository;com;android;support;constraint;constrai‌​nt-layout;1.0.0-beta‌​4" from android-tools/bin.

[Syed Raheem Uddin]

Great helped me, but we need to sync and update both [ gradle and sdk tools versions]

[Baxter]

I was stuck on this until I saw your post I needed a specific older version of these. Great tip!

[Steve Gelman]

I'm running on Ubuntu, and my ~/Android/Sdk/extras/m2repository was owned by root:root. I chowned it to my user, and I could then update the library.

[pjd]

As of Android Studio 2.3.3 on Windows, the mouse clicks required are File-->Settings-->Appearance & Behavior-->System Settings-->Android SDK-->SDK Tools tab. Then check "ConstraintLayout for Android" and "Solver for ConstraintLayout." Finally, Build-->Rebuild Project

[Sejal Baraiya]

Yes I agreed with your answer

[Sagar Roy]

My current version is 3.0 i have tried your ways but its not solved :(

[Tiago Simões]

Use latest version of contraint-layout

[Louis]

I guess a simpler solution is expected.

[Jesh Kundem]

Where would one add this line of code? I have latest android version 3.6 and I do not have a Support Repository option in SDK Tools