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Android app getting crashed : com.android.support.constraint:constraint-layout : Error

I have started to learn Android. I am trying to work on Google Map APIs. My app is crashing every time I am trying to launch it, upon investigation I found one notification in build.gradle file.
Please refer this image to see the message from compiler
I changed com.android.support.constraint:constraint-layout:1.0.0-alpha7 to com.android.support.constraint:constraint-layout:1.0.0-alpha9 to support compileSdkVersion 26. I am not finding any relevant links on Google to fix this issue.

Your compile sdk version is greater than your support libraries,
try modifying your gradle as
android {
...
compileSdkVersion 25
...
}
and within the dependency you can add
compile 'com.android.support.constraint:constraint-layout:1.0.2'

Please refer to this post, if you run the Gradle command you can see what of your dependencies has a different buildtools version.
From the post:
Run a Gradle dependency report to see what your full tree of
dependencies is. From there, you will see which one of your libraries
is asking for a different version of the Android Support libraries.
For whatever it is asking for, you can ask for it directly with the
25.2.0 version, or use Gradle's other conflict resolution approaches to arrange to get the same version.
Run:
./gradlew -q dependencies <module-name>:dependencies --configuration compile
Example:
./gradlew -q dependencies app:dependencies --configuration compile

appcompat version and declaration issue

i try to migrate minSDK from 9 to 14 (that's newest play_services minimum). Target SDK is 17. When i change it manually in gradle and manifest after sync, a huge list of problems showing up. Most of them has something in common with appcompact.
E:\Android\Android\android studio projects\Sklepik\app\build\intermediates\exploded-aar\com.android.support\appcompat-v7\24.0.0\res\values-v23\values-v23.xml
I think that these problems are because wrong version is in use (project works good few months ago), but i can't find place of declaration appcompact.
Right now i've got 2 dependiences in gradle:
dependencies {
compile 'com.android.support:support-v4:19.1.0'
compile 'com.google.android.gms:play-services:10.2.0'
}
How to solve it?
---> Keyur, after change support version i have problem which looks like:
of course my internet connection is ok...

Add support v7 library
compile 'com.android.support:support-v7:19.1.0'

Gradle error while adding dependencies

I want to add a card view so that I want to add dependencies (got from google search) when the time of adding dependencies
compile 'com.android.support:cardview-v7:21.0.+'
I am getting gradle error saying that
This support library should not use a different version (21) than the compileSdkVersion (23) less... (Ctrl+F1)
There are some combinations of libraries, or tools and libraries, that are incompatible, or can lead to bugs. One such incompatibility is compiling with a version of the Android support libraries that is not the latest version (or in particular, a version lower than your targetSdkVersion.)

Change your CardView dependency to:
compile 'com.android.support:cardview-v7:23.1.1'
You cannot have a different compile SDK version to versions of the support library.

You used sdk version 23 for your project, but you use version 21 for cardview. If you compile with cardview-v7:23 there should not be a problem any more. It is also a good idea to update the support libraries, if this does not help.
Edit: As I see the picture you posted, you can see that you use 23.1.1 for the other dependencies, but 21.0.+ for the others. Change 21.0.+ to 23.1.1

compile 'com.android.support:cardview-v7:23.0.1'

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

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

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.

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'
}

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'

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

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'
}

I updated my android gradle plugin to 2.2.0-alpha4 and constraint layout dependency to 1.0.0-alpha3 and it seems to be working now

First I tried everything that I have read on stackoverflow...from updating gradle to XY version, to updating ConstraintLayout to XY version...I even update my SDK tools and Android Studio to the latest version...but nothing was working.
The only solution that worked for me was that I delete ConstraintLayout library from gradle and SDK, then I opened random xml layout and in Design view under Palette section search for ConstraintLayout. If you have successfully deleted library from your project then you will be able to install the library from there if you double clicked on ConstraintLayout element.
That has create next line in my app build.gradle:
'com.android.support.constraint:constraint-layout:1.0.0-beta1'
In my project build.gradle I have this:
classpath 'com.android.tools.build:gradle:2.2.2'
Android studio version 2.2.2

Alpha version is no longer available !
implementation 'com.android.support.constraint:constraint-layout:1.1.3'

Just to make sure that in studio version 2.3 you won't see a dropdown near constraint-layout in sdk tools, it will by default install the latest version
To get the desired version check the box saying show package details and boom you can now choose the desired version you want to install

gradle com.android.tools.build:gradle:2.2.0-alpha6
constraint layout dependency com.android.support.constraint:constraint-layout:1.0.0-alpha4
works for me

For me it was a completely different issue. When I installed constraint dependancy in SDK tools, the tools somehow wrote them into the wrong directory. That is
/home/${USER}/Android/Sdk/extras/+m2repository+/com/.../constraint
instead of
/home/${USER}/Android/Sdk/extras/+android+/+m2repository+/com/.../constraint
Remedy:
Just copy the 1.0.0-alpha* directories into the latter path

While updating SDK tools, a dilog box presented with Constraint layout version that is going to get installed. Note that and update your dependency based on that. In my case it was installing beta3.
I changed my dependency like below. After that it worked.
compile 'com.android.support.constraint:constraint-layout:1.0.0-beta3'

In my case, I had to remove the previous versions first and download the latest one instead. v1.0 stable was released on Feb 23rd.

In my case, I had a multi-module project called "app" and "sdk". The "sdk" module is the one where I had added the constraint layout library. I got the error when I tried to incorporate "sdk" into a new multi-module project called "app2". The solution was to ensure I had added the Google Maven Repository to the project-level build.gradle file for "app2". The Google Maven Repository can be added by putting "google()" under allprojects.repositories in the project-level build.gradle file:
allprojects {
repositories {
jcenter()
google()
}
}

In my case, I was using AS 2.3 and I wanted to use the currently latest ConstraintLayout 1.1.3, but the latest version in my Preferences > Appearance & Behavior > System Settings > Android was 1.0.2.
To use ConstraintLayout 1.1.3, I updated my AS from 2.3 to currently latest 3.2.1, com.android.tools.build:gradle from 2.2.2 to 3.2.1, gradle from 3.3 to 4.6 and buildToolsVersion from 25.0.0 to 28.0.3.
I also added maven { url 'https://maven.google.com' } to the Maven repositories in the project-level build.gradle file and that solved my problem.

Just as a heads up to those still searching for this.
ConstraintLayout 1.0.1 and lower have been deprecated by maven.
For a list of available constraint layouts that can be downloaded, see below:
https://maven.google.com/web/index.html?q=Constrain#com.android.support.constraint:constraint-layout
The easiest solution at the moment, is to change
implementation 'com.android.support.constraint:constraint-layout:1.0.0-beta1'
to
implementation 'com.android.support.constraint:constraint-layout:1.0.2'

I used com.android.support.constraint:constraint-layout:1.0.0-alpha2 with classpath 'com.android.tools.build:gradle:2.1.0', it worked like charm.

Not sure if I'm too late, but in case someone has still the error after an update of ConstraintLayout and Solver over the SDK Tools, maybe this solution could help: Error:(30, 13) Failed to resolve: com.android.support.constraint:constraint-layout:1.0.0-alpha4

Its available in androidx as following package
implementation "androidx.constraintlayout:constraintlayout:2.0.0-alpha1"

Update your constraint layout dependency to the relevant version from '1.0.0-alpha2'. In my case, I changed to the following.
compile 'com.android.support.constraint:constraint-layout:2.0.0-alpha5'

I added the following script in build.gradle(app) under android & I was able to compile.
compileOptions {
sourceCompatibility 1.8
targetCompatibility 1.8
}

Similar issue solved by Reinstalling Android Studio.

i'm try constraint layout dependency update available 1,and plugin gradle alpha-6,it worked

Failed to resolve: com.android.support:appcompat-v7:15.+

i find 2 solutions for this problem, but both didn't work. So i decided to ask you.
I'm using Debian 8 Jessie and Android Studio 1.4
I just created new project and when i tried to start it i got an error:
" Failed to resolve: com.android.support:appcompat-v7:15.+ "
And gives me 3 option.
1) Install Repository and sync project
When i tried it i got an error like this:
Loading SDK information...
Ignoring unknown package filter 'extra-android-m2repository'Warning: The package filter removed all packages. There is nothing to install.
Please consider trying to update again without a package filter.
And down of the window:
Install failed. Please check your network connection and try again. You may continue with creating your project, but it will not complete correctly without the missing components.
2) Show in File
It's my build.gradle dependencies:
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:15.+'
}
Error in this line:
compile 'com.android.support:appcompat-v7:15.+'
3) Show in Project Structure dialog
Dependencies windows is opened and about this line again:
compile 'com.android.support:appcompat-v7:15.+'
Tried Solutions:
Firstly, i tried to download version sdk again. I deleted Android 4.0.3 and re-download again but still same error.
After that i tried to download support library which recommended in; topic 1 , topic 2. After i download Android Support Library, rev 23.0.1 still got same error.
After that i tried to solve my problem with fixing first option in error (install repository and sync project. And i found some topics again. I checked my HTTP Proxy section in Setting, already "No proxy" is selected.
So, i tried everything i found, but still i got this error. Someone can help me please?

After you downloaded the latest support library with your sdk manager, you can set that version in your gradle file.
If you downloaded 23.0.1 set it like this:
compile 'com.android.support:appcompat-v7:23.0.1'
EDIT:
Also note following hint, given by Android Studio, when using + in Version number:
Avoid using + in version numbers; can lead to unpredictable and unrepeatable builds (com.android.support:appcompat-v7:23.1.+)
Using + in dependencies lets you automatically pick up the latest
available version rather than a specific, named version. However, this
is not recommended; your builds are not repeatable; you may have
tested with a slightly different version than what the build server
used. (Using a dynamic version as the major version number is more
problematic than using it in the minor version position.)

Edit build.gradle
Replace 'com.android.support:appcompat-v7:15.+' with 'com.android.support:appcompat-v7:18.0.0'
Sync It
May be this will help you. If in case this will not work i.e. show error then see for installation of app-compat in "%homepath%\AppData\Local\Android\sdk\extras\android\m2repository\com\android\support\appcompat-v7"
Search for the oldest version and put the version number at xx: 'com.android.support:appcompat-v7:xx'

I installed Java and Android Studio today.
When creating my first project with API level 15 as minSDK, I faced the same problem.
As far as I can tell, it seems the installation of the sdk works not pretty well. For me, API level 15 had only the SDK platform. API level 23 had platform and sources. I don't remember, which tools where installed.
To solve the problem, I started the sdk manager (old version), removed api level 15 completely and installed api level 23 as suggested. After that, a newly created project (again with minSDK 15) was properly created.
The difference in the app/build.gradle file is obvious.
Maybe this helps other people facing the same issues, or one of the gurus can further explain, what happened.
Kind Regards

Got same errors.
Mac OSX
V. 10.9.5
Android studio 1.4.1
App:
Before:
android {
compileSdkVersion 15
buildToolsVersion "19.1.0"
After:
android {
compileSdkVersion 23
buildToolsVersion "19.1.0"
Before:
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:15.+'
}
After:
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.1.o'
}
Above changes + Build >> Clean Project.
Hope that helps!

Go to Built tab select "Edit Built types" select properties tab and check built tool version it was 19.1.1 for me.
Then go to built.gradle change compile to 'com.android.support:appcompat-v7:19+' . I changed to 19+ because my built version is 19.1.1 ; You have to select according to your built version(18+,19+,20+ like that).

Try following solution:
In Android studio:
Go to File -> Project structure
Check the selected Build Tools Version.
update your build.gradle for app with selected build tools version.
for e.g. 19.1.0
After update, Run Clean.
Please refer below screenshot.[Project Structure-> Build Tools Types][1]

I had a similar error message when creating a project.
fail to resolve com.android.support:appcompat-v7:14.+
I notice that if I create a new project with support for 4.0.3 instead of 4.0, no error occurs. I am using android studio 1.5. Hope this helps.

in my case, support and wearable versions were different, after making them exactly same, gradle build completed successfully.
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.google.android.support:wearable:1.0.0'
compile 'com.google.android.gms:play-services-wearable:11.0.4'
provided 'com.google.android.wearable:wearable:1.0.0'
}