Android Studio 3.0 unknown element <library> found

问题

After I updated Android Studio, one of my projects cannot be built. The error message is:

Error:(20) error: unknown element <library> found.
Error:(20) unknown element <library> found.
Error:java.util.concurrent.ExecutionException: java.util.concurrent.ExecutionException: com.android.tools.aapt2.Aapt2Exception: AAPT2 error: check logs for details
Error:java.util.concurrent.ExecutionException: com.android.tools.aapt2.Aapt2Exception: AAPT2 error: check logs for details
Error:com.android.tools.aapt2.Aapt2Exception: AAPT2 error: check logs for details
Error:Execution failed for task ':app:processDebugResources'.
    > Failed to execute aapt

My SDK version is 25. I have tried to invalidate cache and add distributionUrl=https://services.gradle.org/distributions/gradle-4.1-rc-2-all.zip, and both of them don't work for me.

Here is my dependencies:

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-v7:25.4.0'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.android.support:support-v4:25.4.0'
compile 'de.hdodenhof:circleimageview:2.2.0'
testCompile 'junit:junit:4.12'

annotationProcessor "com.github.Raizlabs.DBFlow:dbflow-processor:${dbflow_version}"
compile "com.github.Raizlabs.DBFlow:dbflow-core:${dbflow_version}"
compile "com.github.Raizlabs.DBFlow:dbflow:${dbflow_version}"

compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:25.4.0'
compile 'com.android.support:design:25.4.0'

compile 'com.microsoft.projectoxford:face:1.3.0'
}

This is the error log after removing DBFlow:

Error:(20) error: unknown element <library> found.
Error:(20) unknown element <library> found.
Error:java.util.concurrent.ExecutionException: java.util.concurrent.ExecutionException: com.android.tools.aapt2.Aapt2Exception: AAPT2 error: check logs for details
Error:java.util.concurrent.ExecutionException: com.android.tools.aapt2.Aapt2Exception: AAPT2 error: check logs for details
Error:com.android.tools.aapt2.Aapt2Exception: AAPT2 error: check logs for details
Error:Execution failed for task ':app:processDebugResources'.
    > Failed to execute aapt

回答1:

Add this code in gradle.properties in the root project:

android.enableAapt2=false

回答2:

In android studio version 3.1.2 the solution

android.enableAapt2=false

is no longer working.

The root cause of this problem is the Manifest MERGE, which happens when you try to include other dependencies in your project.

To inspect the error

1. Open AndroidManifest.xml

2. On bottom of the window select Merged Manifest Tab

3. Browse your manifest file now, and check the portion of manifest being in the slightly red background or lookup for library tag.

4. Right click and select Go To Declaration. Inspect the file and check which library/depencency it belongs to.

5. Either remove that library or update it from the repo.

Hope this helps.

回答3:

This is a reported issue on Github. The issue in the projectoxford seems to be fixed already at v.1.0.395

回答4:

Try removing the annotation processor that you have added this line annotationProcessor "com.github.Raizlabs.DBFlow:dbflow-processor:${dbflow_version}" if you have used any other remove that also

As in studio 3.0 onwards they have inbuilt annotation processor

回答5:

You need simply to add this to your Android manifest

<library tools:node="removeAll" />

hope it helps :)

回答6:

It requires to append xmlns:tools="http://schemas.android.com/tools" into manifest, so I wrote:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"   <!-- ADD THIS LINE -->
    package="com.microsoft.projectoxford.visionsample" >

    <!-- ... -->

    <library tools:node="removeAll" />
</manifest>

来源：https://stackoverflow.com/questions/47062866/android-studio-3-0-unknown-element-library-found