Develop Reference

Setting gradle to Android O (API 26)

Android studio has automatically update the following components to API 26:
ROM - SDK to API 26
Android SDK Build-Tools 26
Android Emulator 26.0.3
Android SDK Platforms-Tools 26.0.0
Android SDK Tools 26.0.2
My gradle 2.3.3:
apply plugin: 'com.android.application'
android {
compileSdkVersion 26
buildToolsVersion '26.0.0'
defaultConfig {
applicationId "com.mycompany.myapplication"
minSdkVersion 15
targetSdkVersion 26
versionCode 4
versionName "0.0.4"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
/////////If I change it to 26.0.0 it gives errors.///////////
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support:design:25.3.1'
compile 'com.android.support:support-vector-drawable:25.3.1'
compile 'com.android.support:support-v4:25.3.1'
/////////////////////////////////////////////////////////////
testCompile 'junit:junit:4.12'
}
I have two questions (see commented line in Gradle):
How can I know the latest version of these libraries (I simply throw random numbers and try to up them until I found the latest version).
In the excluded group there is 'com.android.support', if I delete that do I need to specify those libraries? I see many people including 'com.android.support' libraries this way so there is a reason I guess to do so.
I searched in developer.android.com and the latest version is 24.2.0 (so really old I have been using 25.3.1).

If you really want to use the 26 version you could use the + character at the end of your dependencies.
compile 'com.android.support:appcompat-v7:26+'
This way, grade will take the latest version beginning with 26.?.? of your dependency. But you will get a warning from Android Studio, because between two different versions the behavior could eventually change and then produce random effect.
To know the latest version, just take a look here : https://developer.android.com/topic/libraries/support-library/revisions.html
And to finish, if you include 'com.android.support', you will include the whole library. And you certainly not need all the stuff included. If you only use recycler view just add :
compile 'com.android.support:recyclerview-v7:26.0.0-beta2'

Check https://developer.android.com/topic/libraries/support-library/revisions.html and set language to English at footer to check latest version of support library. Currently is 25.4.0 (stable) or 26.0.0 (beta 2)

Try this:
allprojects {
repositories {
jcenter()
maven {
url "https://maven.google.com"
}
}
}

Thanks for reporting your issue.upcoming 6.0.0 release includes support for Java 8 features, therefore in order to run it (or any of the betas) you need to upgrade your project to include Java 8 support by adding this into you app's gradle file:
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}

cannot resolve com.google.android.gsm;play-services:25.1.0

i was working on a project, everything was fine but when i tried to run the app, i couldn't,i guess because i'm using a bundled version of google play services. so i i made sure that i update android studio and install the lastest google repository.
but it still wouldn't work. And when i click on install Repostiroy and sync project, still nothing happens.
please help me : this is my gradle ;
apply plugin: 'com.android.application'
android {
compileSdkVersion 25
buildToolsVersion "25.0.2"
defaultConfig {
applicationId "com.example.nefissa.pfe2"
minSdkVersion 16
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.1.0'
compile 'com.android.support:design:25.1.0'
compile 'com.android.support:cardview-v7:25.1.0'
compile 'com.google.android.gms:play-services:25.1.0'
testCompile 'junit:junit:4.12'
}
please where did i go wrong?
a screenshot;please what can i do? the click on install wouldn't work

replace it with compile 'com.google.android.gms:play-services:10.2.0'
and add apply plugin: 'com.google.gms.google-services' on the bottom of your gradle,
and make sure you added classpath 'com.google.gms:google-services:3.0.0'
in the Top-level build.gradle file

There might one of these problems can cause this issue, try any one of them.
Solution 1:
Try to updated the gradle plugin.
dependencies {
classpath 'com.android.tools.build:gradle:1.5.0'
}
Then just Build->Clean project and everything works again.
Solution 2:
Go to the main module in your project, it's usually have the name app.
Then go to > Open Module Settings > in Properties change the Build Tools Version to 25.0.1
Then to make sure open the build.gradle file, and change compileSDKVersion & buildToolsVersion to 25 and 25.0.1 respectively.
If the above solution doesnt work.
Solution 3:
From this answer
"build cache" is enabled by default in build Android Plugin since 2.3.0. It creates files in build cache outside of project folder (e.g. in \Users\%username%.android\build-cache). Theese files are intended to be common between your projects.
And then Android Studio is unable to navigate in theese files.
You can disable Build Cache in gradle.properties file. just add android.enableBuildCache=false

gradle sync error in android 2.2.3

I am facing a horrified error. After installing android studio 2.2.3, i couldn't build my very first project due to gradle error. I even tried using maven link but i use my PC offline. The following is my gradle script:
apply plugin: 'com.android.application'
android {
compileSdkVersion 25
buildToolsVersion "25.0.2"
defaultConfig {
applicationId "com.example.samim.myapplication"
minSdkVersion 17
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
androidTestCompile fileTree(include: ['*.jar'], dir: 'libs')
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
androidTestCompile 'com.android.support:appcompat-v7:25.1.1'
testCompile 'junit:junit:4.12'
}
I am also posting an image regarding the errors.
After doing clean build and rebuild
project gradle

I tried using maven link but i use my PC offline
That's your problem.
Gradle uses the exact same sources as Maven would.
Once you get online, your dependencies should resolve from any "New Project" in Android Studio. You then should let the dependencies download, and then you are welcome to work offline.
Note: You also need to download the Android SDK

The best solution is to add untrusted server certificates automatically to android studio when using the internet from workplace. Go to Settings -> Tools -> Server Certificates, now check "Accept non-trusted certificates automatically". After this coding can be done offline.
Also using a third party VPN solves certificate issues.

Android Studio Build.Gradle Sync Error

I am experiencing a problem building my application in Android Studio. I am using Android Studio 2.2 Preview 7. When I start up my Android Studio it gives an error:
The plugin is too old, please update to a more recent version, or set
ANDROID_DAILY_OVERRIDE environment variable to xxxxxxx.
It requests I fix plugin version and sync project. I have made all the required updates but the error remains. I have read similar questions on the issue but they don't seem to apply to my case.
Could you please assist in providing me with a working solution?
Here is my build.gradle file:
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.3"
defaultConfig {
applicationId "com.mobileappdev.novarttech.sunshine"
minSdkVersion 10
targetSdkVersion 23
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:23.3.0'
compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha4'
compile 'com.android.support:design:23.3.0'
testCompile 'junit:junit:4.12'
}

As per my observation it seems like you haven't updated Android SDK platform to version 25. First of all download and install android sdk platform and build tools from SDK Manager and use the following lines in your build.gradle(module app)
compileSdkVersion 25
buildToolsVersion "25.0.0"
Also update dependencies according to that. It should work then

As #claudio-redi says, you need to upgrade your build gradle tools.
Use build tools 2.2.2 to your root build.gradle:
classpath 'com.android.tools.build:gradle:2.2.2'
And change the gradle distribution to 2.14.1 in gradle/wrapper/gradle-wrapper.properties file with:
distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip
Or if you already have download the gradle distribution and place it in a directory, you can set it in your Android Studio from menu File->Setting->Gradle and set it as the following image:
Please be noted when you want to use API Level 25 you need to make sure that compileSdkVersion, buildToolsVersion, targetSdkVersion, and Support Library using the same API Level 25.

Failed to find: com.android.support:support-v4:22.2.0

I am trying to do an application but there seems to be some error with the gradle files now. It was working fine until I upgraded the support libraries.
I was working with api 21 which worked fine, but then i upgraded to api22 and changed the gradle files accordingly.. Now this error shows up.
Error:Failed to find: com.android.support:support-v4:22.2.0
This is my current gradle file :
apply plugin: 'com.android.application'
android {
compileSdkVersion 22
buildToolsVersion "22.0.1"
defaultConfig {
applicationId "com.example.sampleapp"
minSdkVersion 12
targetSdkVersion 22
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:22.2.0'
compile 'com.android.support:recyclerview-v7:22.2.0'
compile 'com.jakewharton:butterknife:6.1.0'
}
Any help would be appreciated.

If this might help someone, after MANY trials and errors, I found that I was targeting the wrong SDK version (an older one) in the build.gradle file corresponding to "library". To change this you can do it by hand or go to the Module Settings Menu (right click on your project folder -> Open Module Settings. Then in "library" - Properties you can change the Compile Sdk and the Build Tools Versions

Using Android SDK Manager. Go to Extras and then Android Support Repository and update it to the latest version.
(This is essentially the comment #natario made, but it should be an answer.)