Show notification for files converted to Kotlin after project sync

idea/kotlin-android-plugin/src/org/jetbrains/kotlin/android/actions/KotlinNewActivityNotification.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2010-2016 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.android.actions
+
+import com.intellij.openapi.fileEditor.FileEditor
+import com.intellij.openapi.util.Key
+import com.intellij.openapi.vfs.VirtualFile
+import com.intellij.ui.EditorNotificationPanel
+import com.intellij.ui.EditorNotifications
+
+class KotlinNewActivityNotification : EditorNotifications.Provider<EditorNotificationPanel>() {
+    override fun getKey() = KEY
+
+    override fun createNotificationPanel(file: VirtualFile, editor: FileEditor): EditorNotificationPanel? {
+        if (NewKotlinActivityAction.willBeConvertedToKotlin(file)) {
+            return EditorNotificationPanel().apply {
+                setText("This file will be converted to Kotlin after Gradle project sync")
+            }
+        }
+        return null
+    }
+
+    companion object {
+        private val KEY = Key.create<EditorNotificationPanel>("Kotlin.new.activity.notification")
+    }
+}

idea/kotlin-android-plugin/src/org/jetbrains/kotlin/android/actions/NewKotlinActivityAction.kt

@@ -46,15 +46,20 @@ class NewKotlinActivityAction: AnAction(KotlinIcons.FILE) {
             subscribe(project, gradleSyncListener)
         }
 
+        internal fun willBeConvertedToKotlin(file: VirtualFile): Boolean {
+            return javaFilesToKotlin?.any {
+                it.virtualFile == file
+            } ?: false
+        }
+
         private val LOG = Logger.getInstance(NewKotlinActivityAction::class.java)
+        private var javaFilesToKotlin: List<PsiJavaFile>? = null
 
         private fun convertFilesAfterProjectSync(files: List<PsiJavaFile>) {
-            gradleSyncListener.javaFilesToKotlin = files
+            javaFilesToKotlin = files
         }
 
         private val gradleSyncListener = object: GradleSyncListener.Adapter() {
-            internal var javaFilesToKotlin: List<PsiJavaFile>? = null
-
             override fun syncSucceeded(project: Project) {
                 convertFiles(project)
             }

idea/src/META-INF/android.xml

@@ -13,6 +13,8 @@
                          groupName="Kotlin"
                          enabledByDefault="true"
                          level="ERROR"/>
+
+        <editorNotificationProvider implementation="org.jetbrains.kotlin.android.actions.KotlinNewActivityNotification"/>
     </extensions>
 
     <extensions defaultExtensionNs="org.jetbrains.kotlin">