Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve

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:

You might be importing Application instead of Module. Well you can change it in module's gradle also.

Change

apply plugin: 'com.android.application'

apply plugin: 'com.android.library'

You also need to remove applicationId from the gradle.

回答2:

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3:

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

Go to "File".
Click on Invalidate Cache/ Restart.
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4:

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

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"
        }
    }
}

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5:

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'])

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

回答7:

I know its very late but I think it may help someone in resolving his issue.

In my case It was occurring because compileSdkVersion and targetSdkVersion was set to 29 while when I check my SDK Manager, It was showing that package is partially installed. Whereas SDK version 28 was completely installed. I changed my compileSdkVersion and targetSdkVersion to 28 along with support libraries.

Earlier: compileSdkVersion 29 targetSdkVersion 29 implementation 'com.android.support:appcompat-v7:29.+' implementation 'com.android.support:design:29.+'

After Modification: compileSdkVersion 28 targetSdkVersion 28 implementation 'com.android.support:appcompat-v7:28.+' implementation 'com.android.support:design:28.+'

It worked like a charm after applying these changes.

回答8:

@shizhen answer not worked my case.

Spend more than one day and finally got a working solution. I Was in office environment so by trying different methods my gradle file get corrupted. So I removed all proxy and port info form from following file and things got worked.

User -> .gradle -> gradle.properties

Additionally I enabled "Auto-detect proxy settings" under Android studio -> preferences -> HTTP proxy for network and studio will auto detect network config.

Special credit

回答9:

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10:

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11:

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

回答12:

In my case I used google play services...I increase library service it solved

implementation 'com.google.android.gms:play-services-auth:16.0.0'

Google play service must be same in library and app modules

Reference

回答13:

As @Ebin Joy said, If your gradle file get corrupted then there is one simple solution for that. Manually give the proxy details like shown in image. then you're good to go. This solution only works if you using any closed networks like office network etc.

来源：https://stackoverflow.com/questions/51218535/unable-to-resolve-dependency-for-appdebug-compileclasspath-could-not-resolv

标签

android

android-gradle-plugin

build.gradle

android-studio-3.0