Android is possible include .aar with activity extends Application?

Question

I have an Android project, inside I have a library module, my project works fine, compile the project I get the .aar included in a test project and everything ok. Now,I have added in my library module a Activity that extends Application, Y Added this class in the manifiest.xml of the library

<application
        android:allowBackup="true"
        android:label="@string/app_name"
        android:name=".MyActivityExtendsApplications"

When I test the project it works perfect, but when I take the .aar and test it on other project fails. The problem is that it does not find the activity extend Application ... I have decompiled the aar and I see that everything is correct, all class are inside the folder The error is

Caused by: java.lang.ClassNotFoundException: Didn't find class "com.mylibrary.MyActivityExtendsApplications" on path: DexPathList[[zip file "/data/app/com.myapplication-1/base.apk"],nativeLibraryDirectories=[/data/app/com.myapplication-1/lib/arm, /vendor/lib, /system/lib]]
Suppressed: java.lang.ClassNotFoundException: com.mylibrary.MyActivityExtendsApplications
                      at java.lang.Class.classForName(Native Method)
                      at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
                      at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
                      at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
                            ... 12 more
                   Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available

I adding grandle dependency to library .aar In all cases in the same way

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-v7:24.2.1'
    compile 'com.android.support:design:24.2.1'
    testCompile 'junit:junit:4.12'
    compile 'mylibrary-debug.mylibrary-debug@aar'

}
repositories{
    flatDir{
        dirs 'libs'

    }
}

I check merged manifest in my test Project and the activity is there

application
        android:name="com.mylibrary.MyActivityExtendsApplications"
        android:allowBackup="true"

And I can import this Activity in my test Project and see the code

And I added mylibrary in libs folder. When I remove the activity MyActivityExtendsApplications, my library works fine.

Answer 1

The issue may be the the Android Beacon Library aar files are missing when you generate your library aar, and the exception description is simply misleading. I don't think classes from aar files are automatically merged when generating a new aar file. You might check to see if these files (like Beacon.class) are missing from your aar.

If this is indeed the problem, there are two possible solutions:

• In your application, reference both your library aar file and the Android Beacon Library aar file.
• Merge the classes from the first aar file into your new aar file. I have done this before with rather a rather inelegant shell script that I am happy to share, but there may be a better way to accomplish the same thing.