Utility that automatically generates intent-filter to process files by extensions

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" ...>
	<application ...>
		<activity ...>
			<!--suppress AndroidElementNotAllowed -->
			<intent-filter-ext exts="mp3,ogg" max-nesting="16" tools:ignore="MissingPrefix"/>
		</activity>
	</application>
</manifest>

build.gradle

apply plugin: 'com.android.application'
apply from: 'exts.gradle'

android {
	...
	applicationVariants.all { variant ->
		...
		processManifest(variant)
	}
}

exts.gradle

def newIntentFilter(activity) {
	def filter = new Node(activity, 'intent-filter')
	new Node(filter, 'action', ['android:name': 'android.intent.action.VIEW'])
	new Node(filter, 'category', ['android:name': 'android.intent.category.DEFAULT'])
	new Node(filter, 'category', ['android:name': 'android.intent.category.BROWSABLE'])
	return filter
}

def processManifestIntentFilterEx(xml) {
	xml.application.each { application ->
		application.'activity'.each { activity ->
			activity.'intent-filter-ext'.each { filter ->
				def exts = filter.@exts
				def maxNesting = filter.@'max-nesting'.toInteger()
				logger.info("Processing intent-filter-ext: exts=$exts, max-nesting=$maxNesting")
				activity.remove(filter)

				for(nesting in 1..maxNesting) {
					for(curExt in exts.tokenize(',')) {
						def pathPattern = '.*\\\\.' * nesting + curExt
						def intFilter = newIntentFilter(activity)
						new Node(intFilter, 'data', [
								'android:host': '*',
								'android:pathPattern': pathPattern
						])

						def intFilterSchemes = newIntentFilter(activity)
						new Node(intFilterSchemes, 'data', [
								'android:host': '*',
								'android:scheme': 'file',
								'android:pathPattern': pathPattern
						])
						new Node(intFilterSchemes, 'data', [
								'android:host': '*',
								'android:scheme': 'http',
								'android:pathPattern': pathPattern
						])
						new Node(intFilterSchemes, 'data', [
								'android:host': '*',
								'android:scheme': 'https',
								'android:pathPattern': pathPattern
						])
						new Node(intFilterSchemes, 'data', [
								'android:host': '*',
								'android:scheme': 'content',
								'android:pathPattern': pathPattern
						])

						def intFilterSchemesMimes = newIntentFilter(activity)
						new Node(intFilterSchemesMimes, 'data', [
								'android:host': '*',
								'android:scheme': 'file',
								'android:mimeType': '*/*',
								'android:pathPattern': pathPattern
						])
						new Node(intFilterSchemesMimes, 'data', [
								'android:host': '*',
								'android:scheme': 'http',
								'android:mimeType': '*/*',
								'android:pathPattern': pathPattern
						])
						new Node(intFilterSchemesMimes, 'data', [
								'android:host': '*',
								'android:scheme': 'https',
								'android:mimeType': '*/*',
								'android:pathPattern': pathPattern
						])
						new Node(intFilterSchemesMimes, 'data', [
								'android:host': '*',
								'android:scheme': 'content',
								'android:mimeType': '*/*',
								'android:pathPattern': pathPattern
						])
					}
				}
			}
		}
	}
	return xml
}

ext.processManifest = { variant ->
	variant.outputs.each { output ->
		output.processManifest.doLast {
			def writer = new StringWriter()

			def manifestFile = output.processManifest.manifestOutputFile
			def textIn = manifestFile.getText('UTF-8')
			def xmlIn = new XmlParser().parseText(textIn)

			def xmlOut = processManifestIntentFilterEx(xmlIn)
			new XmlNodePrinter(new PrintWriter(writer)).print(xmlOut)
			def textOut = writer.toString()

			manifestFile.write(textOut, 'UTF-8')
		}
	}
}