Unable to resolve dependency for ':app@debug/c

问题:

Newly installed Android studio 3.1.3 is giving strange dependencies error when making a new project and compiling for very first time.

A similar question that didn't help resolve the problem.

Event Logs:

Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.support:appcompat-v7:28.0.0-alpha3.
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Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.support.constraint:constraint-layout:1.1.2.
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Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.android.support:appcompat-v7:28.0.0-alpha3.
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Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.android.support.constraint:constraint-layout:1.1.2.
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Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve com.android.support:appcompat-v7:28.0.0-alpha3.
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Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve com.android.support.constraint:constraint-layout:1.1.2.
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Unable to resolve dependency for ':app@release/compileClasspath': Could not resolve com.android.support:appcompat-v7:28.0.0-alpha3.
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Unable to resolve dependency for ':app@release/compileClasspath': Could not resolve com.android.support.constraint:constraint-layout:1.1.2.
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Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not resolve com.android.support:appcompat-v7:28.0.0-alpha3.
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Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not resolve com.android.support.constraint:constraint-layout:1.1.2.
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ScreenShot:

this problem happened to me several times and forcing https or http didn't resolve it either

回答1:

I think the problems comes from the following: The internet connection with u was unavailable so Android Studio asked you to enable the "offline work" and you just enabled it

To fix this:

• File
• Settings
• Build, Execution, Deployment
• Gradle
• Uncheck offline work

why might unchecking the offline work solves the problem, because in the Gradle sometimes some dependencies need to update (the ones containing '+'), so internet connection is needed.

回答2:

I had this issue with offline mode enable. I disabled offline mode and synced.

• Open the Preferences, by clicking File > Settings.
• In the left pane, click Build, Execution, Deployment > Gradle.
• Uncheck the Offline work.
• Apply changes and sync project again.

回答3:

1. Try "File"->"Invalidate Caches / Restart ..."
2. Try to clean up your .gradle and .idea directory under your project root directory.

3. Try to add Google Maven repository and sync project

   buildscript {
       repositories {
           jcenter()
           google()
           maven {
              url "https://maven.google.com"
           }
       }
   
       dependencies {
           classpath 'com.android.tools.build:gradle:3.1.3'
       }
   }
   
   allprojects {
       repositories {
           google()
           jcenter()
           maven {
              url "https://maven.google.com"
           }
       }
   }
   

4. If you are using Android Gradle Plugin 3.1.3, you should be sure that your gradle wrapper version is 4.4. Under the root directory of your project, find gradle-wrapper.properties and modify it as below.

   distributionBase=GRADLE_USER_HOME
   distributionPath=wrapper/dists
   zipStoreBase=GRADLE_USER_HOME
   zipStorePath=wrapper/dists
   distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
   

回答4:

I just figured out how to remove this gradle error, follow the following steps.

1- Go to "File". 2- Click on Invalidate Cache/ Restart. 3- Again click on Invalidate Cache / Restart(On dialoge window).

Let the gradle build without any interruption.

Thank You! Regards, hope this will help.

回答5:

I was unable to find the root cause of the issue but got a workaround. I started by setting my the java home variable as such.

• vi ~/.bash_profile (this is for macs only. bash profiles are different on linux)
• type the letter i for insert and then set the JAVA_HOME variable as such
• export JAVA_HOME=/Applications/Android\Studio.app/Contents/jre/jdk/Contents/Home/
• quit the vi editor with esc then type :wq
• Restart the computer
• Voila! Your android studio projects should build without any qualms

回答6:

I'm just sharing this answer because I had similar problem.

In the end, error was caused because I inadvertently changed the fileTree. In my case, I fixed by changing:

// implementation or compile
implementation fileTree(include: ['*.jar'])

to

// implementation or compile
implementation fileTree(include: ['*.jar'], dir: 'libs')

回答7:

This can happen if you are using both

'com.android.support:appcompat-v7:28.0.0-alpha3'
'com.android.support:support-v4:28.0.0-alpha3'

Remove the line

implementation 'com.android.support:support-v4:28.0.0-alpha3' 

from your build.gradle file and try again.

回答8:

In my case : When I setup AS, my windows was configured with proxy. Later, I disconnect proxy and disable proxy in AS settings, But, in file .gradle\gradle.properties - proxy - present

Just, in text editor clear proxy settings from this file

回答9:

I had your issue, i fixed it . this error comes when your target api level is not completely downloaded . you have two ways: go to your SDK menu and download all of the android 9 components or the better way is go to your build.gradle(Module app) and change it like this:But remember, before applying these changes, make sure you have fully downloaded api lvl 8