diff --git a/plugins/android-compiler-plugin/src/org/jetbrains/kotlin/lang/resolve/android/AndroidUIXmlProcessor.kt b/plugins/android-compiler-plugin/src/org/jetbrains/kotlin/lang/resolve/android/AndroidUIXmlProcessor.kt
index 43b085ce7d0..6887dc3680e 100644
--- a/plugins/android-compiler-plugin/src/org/jetbrains/kotlin/lang/resolve/android/AndroidUIXmlProcessor.kt
+++ b/plugins/android-compiler-plugin/src/org/jetbrains/kotlin/lang/resolve/android/AndroidUIXmlProcessor.kt
@@ -52,6 +52,7 @@ import com.intellij.openapi.vfs.impl.*
 import com.intellij.openapi.vfs.*
 import kotlin.properties.*
 import com.intellij.psi.impl.*
+import org.jetbrains.kotlin.types.Flexibility
 
 public abstract class AndroidUIXmlProcessor(protected val project: Project) {
 
@@ -91,7 +92,7 @@ public abstract class AndroidUIXmlProcessor(protected val project: Project) {
         val commonFiles = if (generateCommonFiles) {
             val clearCacheFile = renderLayoutFile("kotlinx.android.synthetic") {} +
                              renderClearCacheFunction("Activity") + renderClearCacheFunction("Fragment")
-            listOf(clearCacheFile)
+            listOf(clearCacheFile, FLEXIBLE_TYPE_FILE)
         } else listOf()
 
         return resourceManager.getLayoutXmlFiles().flatMap { file ->
@@ -131,7 +132,7 @@ public abstract class AndroidUIXmlProcessor(protected val project: Project) {
     }
 
     private fun KotlinStringWriter.writeAndroidImports() {
-        androidImports.forEach { writeImport(it) }
+        ANDROID_IMPORTS.forEach { writeImport(it) }
         writeEmptyLine()
     }
 
@@ -141,9 +142,10 @@ public abstract class AndroidUIXmlProcessor(protected val project: Project) {
 
     private fun KotlinStringWriter.writeSyntheticProperty(receiver: String, widget: AndroidWidget, stubCall: String) {
         val body = arrayListOf("return $stubCall as ${widget.className}")
+        val type = widget.className
         writeImmutableExtensionProperty(receiver,
                                         name = widget.id,
-                                        retType = widget.className,
+                                        retType = "$EXPLICIT_FLEXIBLE_CLASS_NAME<$type, $type?>",
                                         getterBody = body)
     }
 
@@ -154,11 +156,17 @@ public abstract class AndroidUIXmlProcessor(protected val project: Project) {
     }
 
     class object {
-        private val androidImports = listOf(
+        private val EXPLICIT_FLEXIBLE_PACKAGE = Flexibility.FLEXIBLE_TYPE_CLASSIFIER.getPackageFqName().asString()
+        private val EXPLICIT_FLEXIBLE_CLASS_NAME = Flexibility.FLEXIBLE_TYPE_CLASSIFIER.getRelativeClassName().asString()
+
+        private val ANDROID_IMPORTS = listOf(
                 "android.app.Activity",
                 "android.app.Fragment",
                 "android.view.View",
-                "android.widget.*")
+                "android.widget.*",
+                Flexibility.FLEXIBLE_TYPE_CLASSIFIER.asSingleFqName().asString())
+
+        private val FLEXIBLE_TYPE_FILE = "package $EXPLICIT_FLEXIBLE_PACKAGE\n\nclass $EXPLICIT_FLEXIBLE_CLASS_NAME<L, U>"
     }
 
 }
\ No newline at end of file
diff --git a/plugins/android-compiler-plugin/testData/android/converter/simple/fqNameInAttr/layout.kt b/plugins/android-compiler-plugin/testData/android/converter/simple/fqNameInAttr/layout.kt
index 6f303b90ac9..408aed95d87 100644
--- a/plugins/android-compiler-plugin/testData/android/converter/simple/fqNameInAttr/layout.kt
+++ b/plugins/android-compiler-plugin/testData/android/converter/simple/fqNameInAttr/layout.kt
@@ -4,10 +4,11 @@ import android.app.Activity
 import android.app.Fragment
 import android.view.View
 import android.widget.*
+import kotlin.internal.flexible.ft
 
-val Activity.MyButton: org.my.cool.Button
+val Activity.MyButton: ft<org.my.cool.Button, org.my.cool.Button?>
     get() = findViewById(0) as org.my.cool.Button
 
-val Fragment.MyButton: org.my.cool.Button
+val Fragment.MyButton: ft<org.my.cool.Button, org.my.cool.Button?>
     get() = getView().findViewById(0) as org.my.cool.Button
 
diff --git a/plugins/android-compiler-plugin/testData/android/converter/simple/fqNameInAttr/layout1.kt b/plugins/android-compiler-plugin/testData/android/converter/simple/fqNameInAttr/layout1.kt
index c47d6a88d51..a208b38d2e6 100644
--- a/plugins/android-compiler-plugin/testData/android/converter/simple/fqNameInAttr/layout1.kt
+++ b/plugins/android-compiler-plugin/testData/android/converter/simple/fqNameInAttr/layout1.kt
@@ -4,7 +4,8 @@ import android.app.Activity
 import android.app.Fragment
 import android.view.View
 import android.widget.*
+import kotlin.internal.flexible.ft
 
-val View.MyButton: org.my.cool.Button
+val View.MyButton: ft<org.my.cool.Button, org.my.cool.Button?>
     get() = findViewById(0) as org.my.cool.Button
 
diff --git a/plugins/android-compiler-plugin/testData/android/converter/simple/fqNameInTag/layout.kt b/plugins/android-compiler-plugin/testData/android/converter/simple/fqNameInTag/layout.kt
index 6f303b90ac9..408aed95d87 100644
--- a/plugins/android-compiler-plugin/testData/android/converter/simple/fqNameInTag/layout.kt
+++ b/plugins/android-compiler-plugin/testData/android/converter/simple/fqNameInTag/layout.kt
@@ -4,10 +4,11 @@ import android.app.Activity
 import android.app.Fragment
 import android.view.View
 import android.widget.*
+import kotlin.internal.flexible.ft
 
-val Activity.MyButton: org.my.cool.Button
+val Activity.MyButton: ft<org.my.cool.Button, org.my.cool.Button?>
     get() = findViewById(0) as org.my.cool.Button
 
-val Fragment.MyButton: org.my.cool.Button
+val Fragment.MyButton: ft<org.my.cool.Button, org.my.cool.Button?>
     get() = getView().findViewById(0) as org.my.cool.Button
 
diff --git a/plugins/android-compiler-plugin/testData/android/converter/simple/fqNameInTag/layout1.kt b/plugins/android-compiler-plugin/testData/android/converter/simple/fqNameInTag/layout1.kt
index c47d6a88d51..a208b38d2e6 100644
--- a/plugins/android-compiler-plugin/testData/android/converter/simple/fqNameInTag/layout1.kt
+++ b/plugins/android-compiler-plugin/testData/android/converter/simple/fqNameInTag/layout1.kt
@@ -4,7 +4,8 @@ import android.app.Activity
 import android.app.Fragment
 import android.view.View
 import android.widget.*
+import kotlin.internal.flexible.ft
 
-val View.MyButton: org.my.cool.Button
+val View.MyButton: ft<org.my.cool.Button, org.my.cool.Button?>
     get() = findViewById(0) as org.my.cool.Button
 
diff --git a/plugins/android-compiler-plugin/testData/android/converter/simple/multiFile/layout.kt b/plugins/android-compiler-plugin/testData/android/converter/simple/multiFile/layout.kt
index 354d78b29f0..ad6834680d0 100644
--- a/plugins/android-compiler-plugin/testData/android/converter/simple/multiFile/layout.kt
+++ b/plugins/android-compiler-plugin/testData/android/converter/simple/multiFile/layout.kt
@@ -4,28 +4,29 @@ import android.app.Activity
 import android.app.Fragment
 import android.view.View
 import android.widget.*
+import kotlin.internal.flexible.ft
 
-val Activity.item_detail_container: FrameLayout
+val Activity.item_detail_container: ft<FrameLayout, FrameLayout?>
     get() = findViewById(0) as FrameLayout
 
-val Fragment.item_detail_container: FrameLayout
+val Fragment.item_detail_container: ft<FrameLayout, FrameLayout?>
     get() = getView().findViewById(0) as FrameLayout
 
-val Activity.textView1: TextView
+val Activity.textView1: ft<TextView, TextView?>
     get() = findViewById(0) as TextView
 
-val Fragment.textView1: TextView
+val Fragment.textView1: ft<TextView, TextView?>
     get() = getView().findViewById(0) as TextView
 
-val Activity.password: EditText
+val Activity.password: ft<EditText, EditText?>
     get() = findViewById(0) as EditText
 
-val Fragment.password: EditText
+val Fragment.password: ft<EditText, EditText?>
     get() = getView().findViewById(0) as EditText
 
-val Activity.login: Button
+val Activity.login: ft<Button, Button?>
     get() = findViewById(0) as Button
 
-val Fragment.login: Button
+val Fragment.login: ft<Button, Button?>
     get() = getView().findViewById(0) as Button
 
diff --git a/plugins/android-compiler-plugin/testData/android/converter/simple/multiFile/layout1.kt b/plugins/android-compiler-plugin/testData/android/converter/simple/multiFile/layout1.kt
index 4b61ee6a807..f9f44be50b9 100644
--- a/plugins/android-compiler-plugin/testData/android/converter/simple/multiFile/layout1.kt
+++ b/plugins/android-compiler-plugin/testData/android/converter/simple/multiFile/layout1.kt
@@ -4,16 +4,17 @@ import android.app.Activity
 import android.app.Fragment
 import android.view.View
 import android.widget.*
+import kotlin.internal.flexible.ft
 
-val View.item_detail_container: FrameLayout
+val View.item_detail_container: ft<FrameLayout, FrameLayout?>
     get() = findViewById(0) as FrameLayout
 
-val View.textView1: TextView
+val View.textView1: ft<TextView, TextView?>
     get() = findViewById(0) as TextView
 
-val View.password: EditText
+val View.password: ft<EditText, EditText?>
     get() = findViewById(0) as EditText
 
-val View.login: Button
+val View.login: ft<Button, Button?>
     get() = findViewById(0) as Button
 
diff --git a/plugins/android-compiler-plugin/testData/android/converter/simple/multiFile/layout2.kt b/plugins/android-compiler-plugin/testData/android/converter/simple/multiFile/layout2.kt
index a32a827099f..6eaee9ebe6c 100644
--- a/plugins/android-compiler-plugin/testData/android/converter/simple/multiFile/layout2.kt
+++ b/plugins/android-compiler-plugin/testData/android/converter/simple/multiFile/layout2.kt
@@ -4,28 +4,29 @@ import android.app.Activity
 import android.app.Fragment
 import android.view.View
 import android.widget.*
+import kotlin.internal.flexible.ft
 
-val Activity.frameLayout: FrameLayout
+val Activity.frameLayout: ft<FrameLayout, FrameLayout?>
     get() = findViewById(0) as FrameLayout
 
-val Fragment.frameLayout: FrameLayout
+val Fragment.frameLayout: ft<FrameLayout, FrameLayout?>
     get() = getView().findViewById(0) as FrameLayout
 
-val Activity.passwordField: TextView
+val Activity.passwordField: ft<TextView, TextView?>
     get() = findViewById(0) as TextView
 
-val Fragment.passwordField: TextView
+val Fragment.passwordField: ft<TextView, TextView?>
     get() = getView().findViewById(0) as TextView
 
-val Activity.passwordCaption: EditText
+val Activity.passwordCaption: ft<EditText, EditText?>
     get() = findViewById(0) as EditText
 
-val Fragment.passwordCaption: EditText
+val Fragment.passwordCaption: ft<EditText, EditText?>
     get() = getView().findViewById(0) as EditText
 
-val Activity.loginButton: Button
+val Activity.loginButton: ft<Button, Button?>
     get() = findViewById(0) as Button
 
-val Fragment.loginButton: Button
+val Fragment.loginButton: ft<Button, Button?>
     get() = getView().findViewById(0) as Button
 
diff --git a/plugins/android-compiler-plugin/testData/android/converter/simple/multiFile/layout3.kt b/plugins/android-compiler-plugin/testData/android/converter/simple/multiFile/layout3.kt
index 071c81699c4..1ebaca425c0 100644
--- a/plugins/android-compiler-plugin/testData/android/converter/simple/multiFile/layout3.kt
+++ b/plugins/android-compiler-plugin/testData/android/converter/simple/multiFile/layout3.kt
@@ -4,16 +4,17 @@ import android.app.Activity
 import android.app.Fragment
 import android.view.View
 import android.widget.*
+import kotlin.internal.flexible.ft
 
-val View.frameLayout: FrameLayout
+val View.frameLayout: ft<FrameLayout, FrameLayout?>
     get() = findViewById(0) as FrameLayout
 
-val View.passwordField: TextView
+val View.passwordField: ft<TextView, TextView?>
     get() = findViewById(0) as TextView
 
-val View.passwordCaption: EditText
+val View.passwordCaption: ft<EditText, EditText?>
     get() = findViewById(0) as EditText
 
-val View.loginButton: Button
+val View.loginButton: ft<Button, Button?>
     get() = findViewById(0) as Button
 
diff --git a/plugins/android-compiler-plugin/testData/android/converter/simple/singleFile/layout.kt b/plugins/android-compiler-plugin/testData/android/converter/simple/singleFile/layout.kt
index 354d78b29f0..ad6834680d0 100644
--- a/plugins/android-compiler-plugin/testData/android/converter/simple/singleFile/layout.kt
+++ b/plugins/android-compiler-plugin/testData/android/converter/simple/singleFile/layout.kt
@@ -4,28 +4,29 @@ import android.app.Activity
 import android.app.Fragment
 import android.view.View
 import android.widget.*
+import kotlin.internal.flexible.ft
 
-val Activity.item_detail_container: FrameLayout
+val Activity.item_detail_container: ft<FrameLayout, FrameLayout?>
     get() = findViewById(0) as FrameLayout
 
-val Fragment.item_detail_container: FrameLayout
+val Fragment.item_detail_container: ft<FrameLayout, FrameLayout?>
     get() = getView().findViewById(0) as FrameLayout
 
-val Activity.textView1: TextView
+val Activity.textView1: ft<TextView, TextView?>
     get() = findViewById(0) as TextView
 
-val Fragment.textView1: TextView
+val Fragment.textView1: ft<TextView, TextView?>
     get() = getView().findViewById(0) as TextView
 
-val Activity.password: EditText
+val Activity.password: ft<EditText, EditText?>
     get() = findViewById(0) as EditText
 
-val Fragment.password: EditText
+val Fragment.password: ft<EditText, EditText?>
     get() = getView().findViewById(0) as EditText
 
-val Activity.login: Button
+val Activity.login: ft<Button, Button?>
     get() = findViewById(0) as Button
 
-val Fragment.login: Button
+val Fragment.login: ft<Button, Button?>
     get() = getView().findViewById(0) as Button
 
diff --git a/plugins/android-compiler-plugin/testData/android/converter/simple/singleFile/layout1.kt b/plugins/android-compiler-plugin/testData/android/converter/simple/singleFile/layout1.kt
index 4b61ee6a807..f9f44be50b9 100644
--- a/plugins/android-compiler-plugin/testData/android/converter/simple/singleFile/layout1.kt
+++ b/plugins/android-compiler-plugin/testData/android/converter/simple/singleFile/layout1.kt
@@ -4,16 +4,17 @@ import android.app.Activity
 import android.app.Fragment
 import android.view.View
 import android.widget.*
+import kotlin.internal.flexible.ft
 
-val View.item_detail_container: FrameLayout
+val View.item_detail_container: ft<FrameLayout, FrameLayout?>
     get() = findViewById(0) as FrameLayout
 
-val View.textView1: TextView
+val View.textView1: ft<TextView, TextView?>
     get() = findViewById(0) as TextView
 
-val View.password: EditText
+val View.password: ft<EditText, EditText?>
     get() = findViewById(0) as EditText
 
-val View.login: Button
+val View.login: ft<Button, Button?>
     get() = findViewById(0) as Button