AndroidAnnotations + Android Studio - The generated null.R class cannot be found - android-studio

Question

I have setup ActiveAndroid as per the wiki instructions using latest version of AndroidStudio. I am using product Flavours. This is my gradle build file:
apply plugin: 'android'
apply plugin: 'android-apt'
apt {
arguments {
androidManifestFile variant.processResources.manifestFile
resourcePackageName android.defaultConfig.packageName
}
}
android {
compileSdkVersion 19
buildToolsVersion "19.0.3"
defaultConfig {
minSdkVersion 8
targetSdkVersion 19
versionCode 1
versionName "1.0"
}
buildTypes {
release {
runProguard false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
}
}
productFlavors {
a {
packageName "com.a.a"
}
b {
packageName "com.a.b"
}
c {
packageName "com.a.c"
}
}
}
dependencies {
apt "org.androidannotations:androidannotations:3.0+"
compile "org.androidannotations:androidannotations-api:3.0+"
compile 'com.android.support:support-v4:19.0.1'
compile 'com.android.support:appcompat-v7:19.0.1'
compile fileTree(dir: 'libs', include: ['*.jar'])
}
Gradle build files but when I compile/go to debug on the device I receive two errors:
Error:: The generated null.R class cannot be found
and
Error:Execution failed for task ':ml:compileADebugJava'.
Compilation failed; see the compiler error output for details.
I have tried numerous setups for my build file but cannot for the life of me get it work. Also when I try and change my AndroidManifest from:
android:name="com.a.a.MainActivity"
to
android:name="com.a.a.MainActivity_"
it states that class cannot be found.
I am using latest version of Gradle and latest version of ActiveAndroid.
Any help would be much appreciated.

Answer 1

I know its late, but it might help someone.
This happens when you modify the applicationId. The script provided in example assumes that you have declared "android.defaultConfig.applicationId". In most of the cases its null, and hence it generated null.R. Either you can define the variable or change the code to following:
defaultConfig {
// Rest of Config
javaCompileOptions {
annotationProcessorOptions {
arguments = ["resourcePackageName": "<Original Package Name>"]
}
}
}
Note that original Package name should be same as the location of R in your activity.
Hope it helps!

Answer 2

I have just got into this same problem, solved by adding packageName to the defaultConfig:
Sample:
defaultConfig {
packageName "com.example.myapp"
minSdkVersion 8
targetSdkVersion 19
versionCode 1
versionName "1.0"
}
Change com.example.myapp according to the name specified in your AndroidManifest.xml.
Hope this helps.

Answer 3

android {
compileSdkVersion 22
buildToolsVersion "22.0.1"
defaultConfig {
applicationId "com.your.app"
minSdkVersion 14
targetSdkVersion 22
versionCode 1
versionName "1.0"
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
apt {
arguments {
androidManifestFile variant.outputs[0].processResources.manifestFile
resourcePackageName android.defaultConfig.applicationId
}
}
It works for me.

Answer 4

I was facing this problem, so I just removed this line:
resourcePackageName android.defaultConfig.packageName
and it worked.

Answer 5

apt {
arguments {
androidManifestFile variant.outputs[0].processResources.manifestFile
resourcePackageName android.defaultConfig.applicationId
}
In my case, It Worked.

Answer 6

change the applicationId==package in the manifest.
100% success.

Answer 7

I had the same problem. I've update the build.gralde file as follow.
For Java I've added:
android {
defaultConfig {
applicationId "<your.application.id>"
javaCompileOptions {
annotationProcessorOptions {
includeCompileClasspath true
arguments = ["resourcePackageName": android.defaultConfig.applicationId]
//arguments = ['androidManifestFile': variant.outputs[0].processResources.manifestFile]
}
}
}
}
For Koltin I've added:
kapt {
arguments {
arg("resourcePackageName", android.defaultConfig.applicationId)
//arg("androidManifestFile", variant.outputs[0]?.processResources?.manifestFile)
}
correctErrorTypes = true // add this if you use data binding
}