Develop Reference

Trouble with gradle in android studio

I know about this questions:
Failed to resolve: com.android.support:cardview-v7:26.0.0 android
Could not resolve com.android.support:appcompat-v7:26.1.0 [duplicate]
Could not resolve com.android.support:appcompat-v7:26.1.0 in Android Studio new project
And I've read this documentations:
Migrate to Android Plugin for Gradle 3.0.0
Migrating to Android 8.0
So I'm posting this question believing its not a duplicate.
I've installed Android Studio 3.4.1. I didn't have any previous version before and I started a new project.
Every setting in Gradle file have been set by Android Studio itself and I've checked them all.
I have already tried
invalidate and restart android studio
Could not resolve com.android.support:appcompat-v7:26.1.0 in Android Studio new project
Failed to resolve: com.android.support:cardview-v7:26.0.0 android
These are the file contents:
build.gradle (Module:app)
apply plugin: 'com.android.application'
android {
compileSdkVersion 29
buildToolsVersion "29.0.0"
defaultConfig {
applicationId "com.example.myapplication"
minSdkVersion 28
targetSdkVersion 29
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.0.2'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
}
Top level build.gradle
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.4.1'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
maven {url 'https://maven.google.com/'}
maven { url "https://jitpack.io" }
maven { url 'https://dl.bintray.com/guardian/android' }
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
gradle-wrapper.properties
#Mon Jun 10 17:40:01 IST 2019
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-5.1.1-all.zip
I use google() in repositories as here clearly says:
// If you're using a version of Gradle lower than 4.1, you must instead use:
// maven {
// url 'https://maven.google.com'
// }
My gradle version is 4.1 so I don't need above code.
But I still get this error as the others have been asking about:
Unable to resolve dependency for
':app#releaseUnitTest/compileClasspath': Could not resolve
androidx.constraintlayout:constraintlayout:1.1.3.
ERROR: Unable to resolve dependency for
':app#releaseUnitTest/compileClasspath': Could not resolve
androidx.versionedparcelable:versionedparcelable:1.0.0.
ERROR: Unable to resolve dependency for
':app#releaseUnitTest/compileClasspath': Could not resolve
androidx.lifecycle:lifecycle-runtime:2.0.0.
ERROR: Unable to resolve dependency for
':app#releaseUnitTest/compileClasspath': Could not resolve
androidx.legacy:legacy-support-core-ui:1.0.0.
ERROR: Unable to resolve dependency for
':app#releaseUnitTest/compileClasspath': Could not resolve
androidx.vectordrawable:vectordrawable-animated:1.0.0.
ERROR: Unable to resolve dependency for
':app#releaseUnitTest/compileClasspath': Could not resolve
androidx.fragment:fragment:1.0.0.
I have also unchecked the offline check box from gradle and using default
Why should I get this error when I'm creating a new project in AS 3.4.1 and it has been set all the necessary settings?

You are trying to mix AppCompat and Jetpack dependencies, and you cannot do that.
I think you might not have the right repository setup for the Jetpack libraries (why it can't find any Jetpack libraries).
Don't use: implementation 'androidx.appcompat:appcompat:1.0.2' . (this is Jetpack) -- use AppCompat versions of this (besides - Jetpack is NOT consistent with Appcompat versions earlier then 28.x). Bottom line, get rid of anything that says (androidx).

Define repositories for both Appcompat and jetpack
allprojects {
repositories {
google()
jcenter()
maven {url 'https://maven.google.com/'}
maven { url "https://jitpack.io" }
maven { url 'https://dl.bintray.com/guardian/android' }
}
}
After that sync project with gradle.. let me know its working or not.

Replace
implementation 'com.android.support:appcompat-v7:26.1.0'
implementation 'com.android.support:design:26.1.0'
with
implementation 'com.android.support:appcompat-v7:26.0.0'
implementation 'com.android.support:design:26.0.0'
EDIT:-
You should invalidate your cache and restart. Follow this steps file -> invalidate caches/Restart Then select invalidate and restart

Android studio unable to build my app after gradle plugin updated

I updated the Gradle plugin yesterday and now the android studio is not able to build my app. The app shows the following error.
ERROR: Unable to resolve dependency for ':app#debug/compileClasspath': Could not resolve io.grpc:grpc-core:[1.16.1].
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app#debugAndroidTest/compileClasspath': Could not resolve io.grpc:grpc-core:[1.16.1].
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app#debugUnitTest/compileClasspath': Could not resolve io.grpc:grpc-core:[1.16.1].
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app#release/compileClasspath': Could not resolve io.grpc:grpc-core:[1.16.1].
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app#releaseUnitTest/compileClasspath': Could not resolve io.grpc:grpc-core:[1.16.1].
Show Details
Affected Modules: app
WARNING: API 'variant.getExternalNativeBuildTasks()' is obsolete and has been replaced with 'variant.getExternalNativeBuildProviders()'.
It will be removed at the end of 2019.
For more information, see https://d.android.com/r/tools/task-configuration-avoidance.
To determine what is calling variant.getExternalNativeBuildTasks(), use -Pandroid.debug.obsoleteApi=true on the command line to display a stack trace.
Affected Modules: app
My app level build.gradle file looks like this:
apply plugin: 'com.android.application'
apply plugin: 'io.fabric'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.example.mvp1stockmeter"
minSdkVersion 16
targetSdkVersion 28
versionCode 1
versionName "1.0"
multiDexEnabled true
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
dataBinding
{
enabled true
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support:design:28.0.0'
implementation 'com.android.support:support-v4:28.0.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.android.support:multidex:1.0.3'
implementation 'org.jsoup:jsoup:1.11.3'
implementation 'com.google.firebase:firebase-core:16.0.7'
implementation 'com.google.firebase:firebase-firestore:18.0.0'
implementation 'com.google.firebase:firebase-core:16.0.7'
implementation 'com.crashlytics.sdk.android:crashlytics:2.9.9'
implementation 'com.firebaseui:firebase-ui-auth:4.3.1'
implementation 'com.google.firebase:firebase-auth:16.1.0'
//implementation 'com.facebook.android:facebook-android-sdk:4.x'
implementation 'com.jjoe64:graphview:4.2.2'
}
apply plugin: 'com.google.gms.google-services'
My project level build.gradle file looks like this:
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
google()
jcenter()
maven {
url 'https://maven.fabric.io/public'
}
}
dependencies {
classpath 'com.android.tools.build:gradle:3.3.2'
classpath 'com.google.gms:google-services:4.2.0'
classpath 'io.fabric.tools:gradle:1.26.1'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
maven {
url 'https://maven.google.com/'
}
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
I searched this on StackOverflow and google as well. But did not find any information. Please help. I am stuck here.

I don't have a clue why this is happening, but it is happening since yesterday, March 21 2019. I think it is a problem in the maven repository? Because the url where android studio is trying to get that library is down.
Anyway, the fix is to "manually" point AS to that missing dependency, adding this line into your build.gradle, inside dependencies{...}
implementation group: 'io.grpc', name: 'grpc-core', version: '1.16.1'
Then sync, then you can delete that line.
Well, I hope someone can explain what happened.

Adding mavenCentral() to allprojects{} section of project level build.gradle file has resolved this issue for me.

Adding mavenCentral() to buildScript{} section of project level build.gradle file has resolved this issue for me. Thanks for your support.

I had three build errors of the following type:
Unable to resolve dependency for ':app#debugUnitTest/compileClasspath': Could not resolve io.grpc:grpc-core:[1.28.0].
As with many of these android studio related issues,
File -> Invalidate Caches / Restart...
did the trick for me.

Delete this line :- testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"...It worked for me

Add mavenCentral() to your buildscripts->repositories and allprojects->repositories both places and sync the project.

Error in library built with jitpack: Unable to resolve dependency for ':app#debug/compileClasspath'

I am trying to publish my android library on jitpack.io but when I tried to add dependency to test my artifact I am getting this error:
Unable to resolve dependency for ':app#debug/compileClasspath': Could not resolve com.github.pashaoleynik97:GSBarcodeScannerHelper:0.1.1-alpha.
Open File
Show Details
Unable to resolve dependency for ':app#debugAndroidTest/compileClasspath': Could not resolve com.github.pashaoleynik97:GSBarcodeScannerHelper:0.1.1-alpha.
Open File
Show Details
Unable to resolve dependency for ':app#debugUnitTest/compileClasspath': Could not resolve com.github.pashaoleynik97:GSBarcodeScannerHelper:0.1.1-alpha.
Open File
Show Details
Unable to resolve dependency for ':app#release/compileClasspath': Could not resolve com.github.pashaoleynik97:GSBarcodeScannerHelper:0.1.1-alpha.
Open File
Show Details
Unable to resolve dependency for ':app#releaseUnitTest/compileClasspath': Could not resolve com.github.pashaoleynik97:GSBarcodeScannerHelper:0.1.1-alpha.
Open File
Show Details
My gradle files in library project are listed below.
My build.gradle (app):
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.github.pashaoleynik97.gsbarcodescannerhelperdemo"
minSdkVersion 21
targetSdkVersion 28
versionCode 2
versionName "1.1"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation project(':gsbarcodescannerhelper')
}
My build.gradle (gsbarcodescannerhelper):
apply plugin: 'com.android.library'
group='com.github.pashaoleynik97;'
android {
compileSdkVersion 28
defaultConfig {
minSdkVersion 21
targetSdkVersion 28
versionCode 2
versionName "0.1.1"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'org.jetbrains.kotlin:kotlin-stdlib:1.3.10'
implementation(name: 'generalscan-sdk-1.0.6', ext:'aar')
}
And finally, my build.gradle (project):
buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.2.0'
classpath 'com.github.dcendents:android-maven-gradle-plugin:1.4.1'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
flatDir {
dirs project(':gsbarcodescannerhelper').file('libs')
}
maven { url 'https://jitpack.io' }
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
I pushed my project on github, created release (through github web interface), then went to jitpack.io and published my library. But when I tried to add this library to my new test project I had errors (listed in top of this post). What I am doing wrong?
UPD
I also tried to add classpath 'com.github.dcendents:android-maven-gradle-plugin:2.1' like in this docs: https://jitpack.io/docs/ANDROID/
But result remains the same.
UPD 2
Created issue: https://github.com/jitpack/jitpack.io/issues/3758

This seems to be a persisting issue for a few days, can be found here, the link mentions a workaround here. The workaround is to add www with the jitpack.io. Hence update it to the following:
maven { url 'https://www.jitpack.io' }

Jitpack is very sensative tool. There are a multitude of reasons why this issue comes up. I will try to itemized them.
1) Failing Unit Tests; if you have any failing unit tests, you will be able to create the artifact on jitpack (with no reported issues) but will be unable to reference the artifact. Make sure all your unit tests are working properly.
2) It is advisable that you include in your project level gradle for the project intended to be the artifact, the following:
Top of Project Level Gradle
apply plugin: 'maven-publish'
group = '<add-your-package-name-here>'
and at the very bottom of your project level gradle include
apply from: 'https://raw.githubusercontent.com/sky-uk/gradle-maven-plugin/master/gradle-mavenizer.gradle'
Now generate an artifact and see if the reference works
3) Private artifact? Maybe you are not referencing your artifact correctly. If your repo is private, be sure to add the auth token in gradle.properties and then reference it on the project level gradle like this,
gradle.properties
authToken=jp_myfake_token
Project Level Gradle:
maven {
url "https://jitpack.io"
credentials{ username authToken }
}
4) Wait a hour. For whatever reason there is syncing and caching issues with Jitpack. Sometimes all you have to do is wait a hour (or two) and everything starts to work.
Hopefully one of these will help you resolve your issue. Jitpack has easy setup, but it is buggy.

make sure that you add maven { url "https://jitpack.io" }
in build.gradle (Project Level) like this:
allprojects {
repositories {
google()
jcenter()
maven { url "https://jitpack.io" }
}
}
also, make sure that's your Gradle offline mode is disabled

Now it is free only for public repositories...
If you put your repository url in https://jitpack.io and looked up, you will see the following message as log:
Subscription not active

Why I can not add my project dependencies?

When I start a new project, I see the following errors about my dependencies.
Actually, I'm using a VPN but I don't know what's the problem?!
And I didn't have this problem before, but now see that since updating my Android Studio, and I should say I searched about this problem a lot but didn't find any solution
Unable to resolve dependency for ':app#debug/compileClasspath': Could not resolve com.google.android.gms:play-services-maps:16.0.0.
Open File
Show Details
Unable to resolve dependency for ':app#debugAndroidTest/compileClasspath': Could not resolve com.android.support.test:runner:1.0.2.
Open File
Show Details
Unable to resolve dependency for ':app#debugAndroidTest/compileClasspath': Could not resolve com.android.support.test.espresso:espresso-core:3.0.2.
Open File
Show Details
Unable to resolve dependency for ':app#debugAndroidTest/compileClasspath': Could not resolve com.google.android.gms:play-services-maps:16.0.0.
Open File
Show Details
Unable to resolve dependency for ':app#debugUnitTest/compileClasspath': Could not resolve com.google.android.gms:play-services-maps:16.0.0.
Open File
Show Details
Unable to resolve dependency for ':app#release/compileClasspath': Could not resolve com.google.android.gms:play-services-maps:16.0.0.
Open File
Show Details
Unable to resolve dependency for ':app#releaseUnitTest/compileClasspath': Could not resolve com.google.android.gms:play-services-maps:16.0.0.
Open File
Show Details
build.gradle (Module:app):
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.example.pasargad.test_map"
minSdkVersion 19
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.google.android.gms:play-services-maps:16.0.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}
build.gradle (Project:...):
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.1.4'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}

First make sure that you have disabled the gradle offline work like the image below.
Now Connect Pc with the internet. Then Sync your Project Again. It should solve your problem.

make sure that android studio is not in offline mode and re sync with internet connection and if all of those do not work then
1) go to android studio folder on file explorer or something and go to gradle and then look at your gradle file (means version for example mine is gradle-4.6-all and then delete it)
2)go to gradler offilce website and download the same gradle version
gradle official site (for example gradle v4.6)
3)unzip it and paste there where you had been deleted
4)Re sync with internet connection

I found my answer. The problem was because of the proxy info in "gradle.properties" file, I deleted all of the lines about proxy (host, password, etc) and synced the project again

How to remove all dependencies on android studio?

I have no internet connection on my machine (because of some reasons) and i want to use Android studio(3) on it with no dependency to the internet.
I Created a very simple (default) App but get lots of errors, I changed the gradle to the local and remove/set offline work option but nothing worked.
Errors:
Error:Unable to resolve dependency for ':app#debug/compileClasspath': Could
not resolve com.android.support:appcompat-v7:26.+.
Open File<br><a
href="Unable to resolve dependency for
':app#debug/compileClasspath': Could not resolve
com.android.support:appcompat-v7:26.+.">Show Details</a>
Error:Unable to resolve dependency for
':app#debugUnitTest/compileClasspath': Could not resolve
com.android.support:appcompat-v7:26.+.
Open File<br><a
href="Unable to resolve dependency for
':app#debugUnitTest/compileClasspath': Could not resolve
com.android.support:appcompat-v7:26.+.">Show Details</a>
Error:Unable to resolve dependency for ':app#release/compileClasspath':
Could not resolve com.android.support:appcompat-v7:26.+.
Open File<br><a
href="Unable to resolve dependency for
':app#release/compileClasspath': Could not resolve
com.android.support:appcompat-v7:26.+.">Show Details</a>
Error:Unable to resolve dependency for
':app#releaseUnitTest/compileClasspath': Could not resolve
com.android.support:appcompat-v7:26.+.
Open File<br><a
href="Unable to resolve dependency for
':app#releaseUnitTest/compileClasspath': Could not resolve
com.android.support:appcompat-v7:26.+.">Show Details</a>
build.gradle(app):
apply plugin: 'com.android.application'
android {
compileSdkVersion 26
defaultConfig {
applicationId "com.example.administrator.myapplication"
minSdkVersion 23
targetSdkVersion 26
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'),
'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:26.+'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
}
build.gradle(project):
buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.0.0'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}

For the first time you need to be connected to the internet so that all your dependencies could be fetched. Once that's done, you no longer need the internet.
But if you try building again, Android Studio (gradle) will still try to connect to internet to refresh the dependencies. If you can't be online then you need to tell Android Studio (i.e, gradle) to work offline.
Go to Android Studio's Preferences -> Build, Execution, Deployment -> Offline Work
Turn this option on and gradle will start to work offline.
Note: com.android.support:appcompat-v7:26.+. won't really work here. You need to mention the specific artifact id and not +.