flutter create: enable Java support in IDEA (#9335)

Generates an android.iml file and a package-level library for flutter.jar.

Does not set up an Android SDK in IDEA; this isn't possible with a
template-based approach. But IDEA shows a clear warning, so the
user can fix this by setting the SDK.

(When creating a Flutter project from within IDEA, we can fix this up
afterwards in the plugin.)

packages/flutter_tools/lib/src/commands/create.dart

@@ -5,6 +5,7 @@
 import 'dart:async';
 
 import '../android/android.dart' as android;
+import '../android/android_sdk.dart' as android_sdk;
 import '../base/common.dart';
 import '../base/file_system.dart';
 import '../base/utils.dart';
@@ -103,7 +104,7 @@ class CreateCommand extends FlutterCommand {
 
     final Map<String, dynamic> templateContext = _templateContext(
         projectName, argResults['description'], dirPath,
-        flutterPackagesDirectory, renderDriverTest: argResults['with-driver-test'],
+        flutterRoot, renderDriverTest: argResults['with-driver-test'],
         withPluginHook: generatePlugin,
     );
 
@@ -188,10 +189,10 @@ Host platform code is in the android/ and ios/ directories under $relativePlugin
   }
 
   Map<String, dynamic> _templateContext(String projectName,
-      String projectDescription, String dirPath, String flutterPackagesDirectory,
+      String projectDescription, String dirPath, String flutterRoot,
       { bool renderDriverTest: false, bool withPluginHook: false }) {
-    flutterPackagesDirectory = fs.path.normalize(flutterPackagesDirectory);
-    flutterPackagesDirectory = _relativePath(from: dirPath, to: flutterPackagesDirectory);
+    flutterRoot = fs.path.normalize(flutterRoot);
+    flutterRoot = _relativePath(from: dirPath, to: flutterRoot);
 
     final String pluginDartClass = _createPluginClassName(projectName);
     final String pluginClass = pluginDartClass.endsWith('Plugin')
@@ -203,8 +204,11 @@ Host platform code is in the android/ and ios/ directories under $relativePlugin
       'androidIdentifier': _createAndroidIdentifier(projectName),
       'iosIdentifier': _createUTIIdentifier(projectName),
       'description': projectDescription,
-      'flutterPackagesDirectory': flutterPackagesDirectory,
+      'dartSdk': '$flutterRoot/bin/cache/dart-sdk',
+      'flutterPackagesDirectory': fs.path.join(flutterRoot, 'packages'),
       'androidMinApiLevel': android.minApiLevel,
+      'androidSdkVersion': android_sdk.minimumAndroidSdkVersion,
+      'androidFlutterJar': "$flutterRoot/bin/cache/artifacts/engine/android-arm/flutter.jar",
       'withDriverTest': renderDriverTest,
       'pluginClass': pluginClass,
       'pluginDartClass': pluginDartClass,

packages/flutter_tools/templates/create/.idea/libraries/Dart_SDK.xml.tmpl

+<component name="libraryTable">
+  <library name="Dart SDK">
+    <CLASSES>
+      <root url="file://{{dartSdk}}/lib/async" />
+      <root url="file://{{dartSdk}}/lib/collection" />
+      <root url="file://{{dartSdk}}/lib/convert" />
+      <root url="file://{{dartSdk}}/lib/core" />
+      <root url="file://{{dartSdk}}/lib/developer" />
+      <root url="file://{{dartSdk}}/lib/html" />
+      <root url="file://{{dartSdk}}/lib/indexed_db" />
+      <root url="file://{{dartSdk}}/lib/io" />
+      <root url="file://{{dartSdk}}/lib/isolate" />
+      <root url="file://{{dartSdk}}/lib/js" />
+      <root url="file://{{dartSdk}}/lib/js_util" />
+      <root url="file://{{dartSdk}}/lib/math" />
+      <root url="file://{{dartSdk}}/lib/mirrors" />
+      <root url="file://{{dartSdk}}/lib/svg" />
+      <root url="file://{{dartSdk}}/lib/typed_data" />
+      <root url="file://{{dartSdk}}/lib/web_audio" />
+      <root url="file://{{dartSdk}}/lib/web_gl" />
+      <root url="file://{{dartSdk}}/lib/web_sql" />
+    </CLASSES>
+    <SOURCES />
+  </library>
+</component>
\ No newline at end of file

packages/flutter_tools/templates/create/.idea/libraries/flutter_for_android.xml.tmpl

+<component name="libraryTable">
+  <library name="Flutter for Android">
+    <CLASSES>
+      <root url="jar://{{androidFlutterJar}}!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

packages/flutter_tools/templates/create/.idea/modules.xml.tmpl

@@ -3,6 +3,7 @@
   <component name="ProjectModuleManager">
     <modules>
       <module fileurl="file://$PROJECT_DIR$/{{projectName}}.iml" filepath="$PROJECT_DIR$/{{projectName}}.iml" />
+      <module fileurl="file://$PROJECT_DIR$/android.iml" filepath="$PROJECT_DIR$/android.iml" />
     </modules>
   </component>
 </project>

packages/flutter_tools/templates/create/android.iml.tmpl

+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$/android">
+      <sourceFolder url="file://$MODULE_DIR$/android/app/src/main/java" isTestSource="false" />
+    </content>
+    <orderEntry type="jdk" jdkName="Android API {{androidSdkVersion}} Platform" jdkType="Android SDK" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="Flutter for Android" level="project" />
+  </component>
+</module>