Build errors after Android Studio 3.2.1 upgrade

问题:

I am building a sample project from Udacity. This was working fine till now, but after upgrading to Android Studio 3.2.1, I am facing the build error below.

Gradle version: 4.6

Project link: https://github.com/udacity/ud851-Sunshine/tree/student/S02.02-Solution-Menus

Could not find com.android.tools.build:aapt2:3.2.1-4818971**. Searched in the following locations:
    file:/C:/Users/sandeepk2/AppData/Local/Android/Sdk/extras/m2repository/com/android/tools/build/aapt2/3.2.1-4818971/aapt2-3.2.1-4818971.pom
    file:/C:/Users/sandeepk2/AppData/Local/Android/Sdk/extras/m2repository/com/android/tools/build/aapt2/3.2.1-4818971/aapt2-3.2.1-4818971-windows.jar
    file:/C:/Users/sandeepk2/AppData/Local/Android/Sdk/extras/google/m2repository/com/android/tools/build/aapt2/3.2.1-4818971/aapt2-3.2.1-4818971.pom
    file:/C:/Users/sandeepk2/AppData/Local/Android/Sdk/extras/google/m2repository/com/android/tools/build/aapt2/3.2.1-4818971/aapt2-3.2.1-4818971-windows.jar
    file:/C:/Users/sandeepk2/AppData/Local/Android/Sdk/extras/android/m2repository/com/android/tools/build/aapt2/3.2.1-4818971/aapt2-3.2.1-4818971.pom
    file:/C:/Users/sandeepk2/AppData/Local/Android/Sdk/extras/android/m2repository/com/android/tools/build/aapt2/3.2.1-4818971/aapt2-3.2.1-4818971-windows.jar
    https://jcenter.bintray.com/com/android/tools/build/aapt2/3.2.1-4818971/aapt2-3.2.1-4818971.pom
    https://jcenter.bintray.com/com/android/tools/build/aapt2/3.2.1-4818971/aapt2-3.2.1-4818971-windows.jar Required by:
    project :app

How can I fix it?

回答1:

For Android Studio 3.2.1 update

Just add google() in root level in build.gradle

buildscript {
    repositories {
        google() //  <--here
        jcenter()
    }
 }

allprojects {
    repositories {
        google() //  <-- here
        jcenter()
    }
}

and see the magic - error is gone.

回答2:

The project gradle version is pretty old:

classpath 'com.android.tools.build:gradle:2.2.3'

And you are using Android Studio v3.2.1 so, update the gradle:

classpath 'com.android.tools.build:gradle:3.2.0' // or 3.2.1 maybe

Also, as you can see, it was looking for some packages in :

file:/C:/Users/sandeepk2/AppData/Local/Android/Sdk/extras/m2repository/com/android/tools/build/aapt2/3.2.1-4818971/aapt2-3.2.1-4818971.pom

Which means you probably forgot to add google() as the top level repository. Just add google()

to your repositories in your root build.gradle.

回答3:

To get this solved

Firstly download the missing Jar file from the link below. I see you are missing version 3.2.1-4818971

https://dl.google.com/dl/android/maven2/com/android/tools/build/aapt2/3.2.1-4818971/aapt2-3.2.1-4818971-windows.jar

Switch your folder structure from Android to Project.

Now navigate to the libs folder inside the app - build folder. (If the libs folder does not exist, you can create it by right clicking on the app folder - select New - select Directory.)

Paste the downloaded.jar file inside libs folder. Right click on the jar file and at the bottom click on Add as library. This will take care of adding implementation files('libs/library_name.jar') in build.gradle [You don't have to manually enter this in your build file].

Everything should be okay once you sync after doing the above. Here is the source link to this solution: https://developer.android.com/studio/command-line/aapt2#download_aapt2

Let me know if you run into any other issues whilst doing the above.

回答4:

Yeah, as d4rkcon said download https://dl.google.com/dl/android/maven2/com/android/tools/build/aapt2/3.2.1-4818971/aapt2-3.2.1-4818971-windows.jar But you can do simplier - just put this file in directory where Andoid Studio is trying to find it. If you don't have directories like /tools/build/aapt2/3.2.1-4818971/ in AndroidSDK folder just create them and then put aapt2-3.2.1-4818971-windows.jar file in.

回答5:

Add Google repository in your build.gradle(Project:xxxxx)

allprojects {
    repositories {
        google()
    }
}

回答6:

Change your build.gradle as follows.

android {
    compileSdkVersion 26
    buildToolsVersion "28.0.3"

    defaultConfig {
        applicationId "your package name here"
        minSdkVersion 15
        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'])
    testImplementation 'junit:junit:4.12'
    implementation 'com.android.support:appcompat-v7:26.1.0'
}

回答7:

add google() on your build script > repositories add google on allprojects > repositories

use implementation as replacement of compile keyword, also on your filetree.

EX.

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })

    implementation 'com.android.support:appcompat-v7:25.3.1'
    implementation 'com.android.support:design:25.3.1'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    implementation 'com.android.support:support-v4:25.3.1'