Use gradle task change activity attribute in AndroidManifest.xml

I want to set an attribue(android:configChanges="screenSize|smallestScreenSize|screenLayout") for all activities in my manifest file with gradle file,and what I'm trying like follow:
I had add some code snippet in my app module's build.gradle file :

android.applicationVariants.all { variant ->
    print("check variant:${variant.getClass()}\n")
    variant.outputs.each { output ->
        print("check output all task:${output.getName()}\n")
        def processorTask = output.processManifestProvider.getOrNull()
        print("check processorTask:${processorTask.getName()}\n")
        //ProcessApplicationManifest
        //https://android.googlesource.com/platform/tools/base/+/studio-master-dev/build-system/gradle-core/src/main/java/com/android/build/gradle/tasks/ProcessApplicationManifest.java
        processorTask.doLast {task ->
            def directory = task.getBundleManifestOutputDirectory()
            def srcManifestFile = "$directory${File.separator}AndroidManifest.xml"
            print("check manifest file:$srcManifestFile\n")
            def manifestContent = new File(srcManifestFile).getText()
            def xml = new XmlParser(false, false).parseText(manifestContent)
            print("check manifest application:${xml.application.size()}")
            xml.application[0].activity.forEach{
                it.attributes().put('android:configChanges', 'screenSize|smallestScreenSize|screenLayout')
            }
            def serializeContent = groovy.xml.XmlUtil.serialize(xml)
            def targetFile = new File(srcManifestFile)
            targetFile.write(serializeContent)
        }

    }
}

After execute command gradlew assembleDebug it generates a file and an apk.File content like this picture

The picture's content is what I'm need,but the generated apk file's content is this:

It lose attributes which added in gradle task.I want to know how to make it works,please help.

My environment

• OS:Windows 10 64 bit
• Android Studio Version: 3.5.2
• com.android.tools.build:gradle:3.5.2

After several days,I addressed this issue by my self,the correct way:

project.afterEvaluate {
def variants = null
try {
variants = android.applicationVariants
} catch (Throwable t) {
try {
variants = libraryVariants
} catch (Throwable tt) {}
}
if (variants != null) {
variants.all { variant ->
variant.outputs.each { output ->
def task = output.processManifestProvider.get()
if (task == null) {
return
}
task.doLast {
def manifestFile = new File(task.manifestOutputDirectory.get().getAsFile(),"AndroidManifest.xml")
if (manifestFile == null || !manifestFile.exists()) {
return
}
def parser = new XmlParser(false, true)
def manifest = parser.parse(manifestFile)
def app = manifest.'application'[0]
app.'activity'.each{act->
String value = act.attributes()['android:configChanges']
if (value == null) {
value = "keyboardHidden|orientation|screenSize"
} else {
String[] valueSplit = value.split("\\|")
if (!valueSplit.contains("keyboardHidden")) {
value+="|keyboardHidden"
}
if (!valueSplit.contains("orientation")) {
value+="|orientation"
}
if (!valueSplit.contains("screenSize")) {
value+="|screenSize"
}
}
act.attributes()["android:configChanges"] = value
}
manifestFile.setText(XmlUtil.serialize(manifest), "utf-8")
}
}
}
}
}

Add this code snippet into end of app/build.gradle.

Well,the above way is only for the situation which every element of activity is not include attribute android:configChanges or will got another question😂😂😂,I post it here.

Well again,🐶🐶🐶after several try,I fixed this problem by myself and I post correct answer in my another issue.

You can solve by using manifest placeholders:

• Manifest:

   <activity
  android:name=".YourActivity"
  android:configChanges="${configChanges}">          
  <intent-filter>
  <action android:name="android.intent.action.MAIN" />
  <category android:name="android.intent.category.LAUNCHER" />
  </intent-filter>
  </activity>
  

• Gradle:

defaultConfig {manifestPlaceholders = [ configChanges:"orientation"]}