Merge pull request #177 from chenenyu/dev

try to fix build error in empty manifest

gradle-plugin/src/main/groovy/com/chenenyu/router/ManifestTransformer.groovy

@@ -5,12 +5,22 @@ import org.gradle.api.Project
 
 class ManifestTransformer {
     static void transform(Project project, File input, File output) {
-        Node xml = new XmlParser().parse(input)
-        Node applicationNode = xml.get('application')[0]
-        applicationNode.appendNode('meta-data', ['android:name': project.name, 'android:value': 'com.chenenyu.router.moduleName'])
-        FileWriter fileWriter = new FileWriter(output)
-        XmlNodePrinter nodePrinter = new XmlNodePrinter(new PrintWriter(fileWriter))
-        nodePrinter.setPreserveWhitespace(true)
-        nodePrinter.print(xml)
+        Node manifest = new XmlParser().parse(input)
+        Node applicationNode = null
+        Object application = manifest.get('application')
+        if (application instanceof NodeList) {
+            if (application.isEmpty()) { // There is no `application` node in AndroidManifest.xml
+                applicationNode = manifest.appendNode("application", ['xmlns:android': 'http://schemas.android.com/apk/res/android'])
+            } else {
+                applicationNode = application.first()
+            }
+            applicationNode.appendNode('meta-data', ['android:name': project.name, 'android:value': 'com.chenenyu.router.moduleName'])
+        }
+        if (applicationNode != null) {
+            FileWriter fileWriter = new FileWriter(output)
+            XmlNodePrinter nodePrinter = new XmlNodePrinter(new PrintWriter(fileWriter))
+            nodePrinter.setPreserveWhitespace(true)
+            nodePrinter.print(manifest)
+        }
     }
 }

gradle.properties

@@ -16,7 +16,7 @@ android.useAndroidX=true
 # apply router plugin
 applyRemotePlugin=false
 # router gradle plugin version
-PLUGIN_VERSION=1.8.1
+PLUGIN_VERSION=1.8.2
 # router library version
 ROUTER_VERSION=1.8.0
 # compiler library version