diff --git a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/AndroidConst.kt b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/AndroidConst.kt
index 37bb9ef3c08..85cf7b6a773 100644
--- a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/AndroidConst.kt
+++ b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/AndroidConst.kt
@@ -16,6 +16,7 @@
 
 package org.jetbrains.kotlin.android.synthetic
 
+import org.jetbrains.kotlin.android.synthetic.res.ResourceIdentifier
 
 object AndroidConst {
     val SYNTHETIC_PACKAGE: String = "kotlinx.android.synthetic"
@@ -32,9 +33,7 @@ object AndroidConst {
     val ID_ATTRIBUTE: String = "$ANDROID_NAMESPACE:$ID_ATTRIBUTE_NO_NAMESPACE"
     val CLASS_ATTRIBUTE_NO_NAMESPACE: String = "class"
 
-    val ID_DECLARATION_PREFIX = "@+id/"
-    val ID_USAGE_PREFIX = "@id/"
-    val XML_ID_PREFIXES = arrayOf(ID_DECLARATION_PREFIX, ID_USAGE_PREFIX)
+    val IDENTIFIER_REGEX = "^@(\\+)?(([A-Za-z0-9_\\.]+)\\:)?id\\/([A-Za-z0-9_]+)$".toRegex()
 
     val CLEAR_FUNCTION_NAME = "clearFindViewByIdCache"
 
@@ -55,13 +54,10 @@ object AndroidConst {
     val FQNAME_RESOLVE_PACKAGES = listOf("android.widget", "android.webkit", "android.view")
 }
 
-fun androidIdToName(id: String): String? {
-    for (prefix in AndroidConst.XML_ID_PREFIXES) {
-        if (id.startsWith(prefix)) {
-            return id.substring(prefix.length)
-        }
-    }
-    return null
+fun androidIdToName(id: String): ResourceIdentifier? {
+    val values = AndroidConst.IDENTIFIER_REGEX.matchEntire(id)?.groupValues ?: return null
+    val packageName = values[3]
+    return ResourceIdentifier(values[4], if (packageName.isEmpty()) null else packageName)
 }
 
 fun isWidgetTypeIgnored(xmlType: String): Boolean {
diff --git a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/AndroidXmlHandler.kt b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/AndroidXmlHandler.kt
index 52fdfaaa492..9bcea5dbe9a 100644
--- a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/AndroidXmlHandler.kt
+++ b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/AndroidXmlHandler.kt
@@ -16,11 +16,12 @@
 
 package org.jetbrains.kotlin.android.synthetic
 
+import org.jetbrains.kotlin.android.synthetic.res.ResourceIdentifier
 import org.xml.sax.Attributes
 import org.xml.sax.helpers.DefaultHandler
 import java.util.HashMap
 
-class AndroidXmlHandler(private val elementCallback: (String, String) -> Unit) : DefaultHandler() {
+class AndroidXmlHandler(private val elementCallback: (ResourceIdentifier, String) -> Unit) : DefaultHandler() {
 
     override fun startDocument() {
         super.startDocument()
diff --git a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/codegen/AndroidExpressionCodegenExtension.kt b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/codegen/AndroidExpressionCodegenExtension.kt
index 9b6e12da51c..3c56a8e3efc 100644
--- a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/codegen/AndroidExpressionCodegenExtension.kt
+++ b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/codegen/AndroidExpressionCodegenExtension.kt
@@ -178,10 +178,16 @@ class AndroidExpressionCodegenExtension : ExpressionCodegenExtension {
                 return putSelectorForFragment(v)
             }
 
+            val syntheticProperty = propertyDescriptor as AndroidSyntheticProperty
+
             if (androidClassType.supportsCache && isCacheSupported(receiverDescriptor, propertyDescriptor)) {
                 val declarationDescriptorType = typeMapper.mapType(receiverDescriptor)
                 receiver.put(declarationDescriptorType, v)
-                v.getstatic(androidPackage.replace(".", "/") + "/R\$id", propertyDescriptor.name.asString(), "I")
+
+                val resourceId = syntheticProperty.resourceId
+                val packageName = resourceId.packageName ?: androidPackage
+                v.getstatic(packageName.replace(".", "/") + "/R\$id", resourceId.name, "I")
+
                 v.invokevirtual(declarationDescriptorType.internalName, CACHED_FIND_VIEW_BY_ID_METHOD_NAME, "(I)Landroid/view/View;", false)
             }
             else {
diff --git a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/descriptors/AndroidSyntheticPackageFragmentDescriptor.kt b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/descriptors/AndroidSyntheticPackageFragmentDescriptor.kt
index 5c7e9e6272c..9d92ad06873 100644
--- a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/descriptors/AndroidSyntheticPackageFragmentDescriptor.kt
+++ b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/descriptors/AndroidSyntheticPackageFragmentDescriptor.kt
@@ -60,8 +60,10 @@ class AndroidSyntheticPackageFragmentDescriptor(
                 when (resource) {
                     is AndroidResource.Widget -> {
                         val resolvedWidget = resource.resolve(module)
-                        for (receiver in widgetReceivers) {
-                            properties += genPropertyForWidget(packageFragmentDescriptor, receiver, resolvedWidget, context)
+                        if (resolvedWidget != null) {
+                            for (receiver in widgetReceivers) {
+                                properties += genPropertyForWidget(packageFragmentDescriptor, receiver, resolvedWidget, context)
+                            }
                         }
                     }
                     is AndroidResource.Fragment -> if (!packageData.forView) {
diff --git a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/AndroidLayoutXmlFileManager.kt b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/AndroidLayoutXmlFileManager.kt
index 651d13edfab..0e731a9e927 100644
--- a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/AndroidLayoutXmlFileManager.kt
+++ b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/AndroidLayoutXmlFileManager.kt
@@ -27,7 +27,6 @@ import com.intellij.psi.PsiManager
 import org.jetbrains.kotlin.android.synthetic.AndroidConst
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
 import org.jetbrains.kotlin.descriptors.PropertyDescriptor
-import org.jetbrains.kotlin.psi.KtProperty
 import java.util.*
 
 class AndroidVariantData(val variant: AndroidVariant, private val layouts: Map<String, List<PsiFile>>): Map<String, List<PsiFile>> by layouts
@@ -91,7 +90,7 @@ abstract class AndroidLayoutXmlFileManager(val project: Project) {
 
     protected abstract fun doExtractResources(files: List<PsiFile>, module: ModuleDescriptor): List<AndroidResource>
 
-    protected fun parseAndroidResource(id: String, tag: String, sourceElement: PsiElement?): AndroidResource {
+    protected fun parseAndroidResource(id: ResourceIdentifier, tag: String, sourceElement: PsiElement?): AndroidResource {
         return when (tag) {
             "fragment" -> AndroidResource.Fragment(id, sourceElement)
             "include" -> AndroidResource.Widget(id, AndroidConst.VIEW_FQNAME, sourceElement)
@@ -104,20 +103,20 @@ abstract class AndroidLayoutXmlFileManager(val project: Project) {
         val resourcesToExclude = hashSetOf<String>()
 
         for (res in resources) {
-            if (resourceMap.contains(res.id)) {
-                val existing = resourceMap[res.id]!!
+            if (resourceMap.contains(res.id.name)) {
+                val existing = resourceMap[res.id.name]!!
 
-                if (!res.sameClass(existing)) {
-                    resourcesToExclude.add(res.id)
+                if (!res.sameClass(existing) || res.id.packageName != existing.id.packageName) {
+                    resourcesToExclude.add(res.id.name)
                 }
                 else if (res is AndroidResource.Widget && existing is AndroidResource.Widget) {
                     // Widgets with the same id but different types exist.
                     if (res.xmlType != existing.xmlType && existing.xmlType != AndroidConst.VIEW_FQNAME) {
-                        resourceMap.put(res.id, AndroidResource.Widget(res.id, AndroidConst.VIEW_FQNAME, res.sourceElement))
+                        resourceMap.put(res.id.name, AndroidResource.Widget(res.id, AndroidConst.VIEW_FQNAME, res.sourceElement))
                     }
                 }
             }
-            else resourceMap.put(res.id, res)
+            else resourceMap.put(res.id.name, res)
         }
         resourcesToExclude.forEach { resourceMap.remove(it) }
         return resourceMap.values.toList()
diff --git a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/androidResources.kt b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/androidResources.kt
index 86ae42b3bb4..ec2f2af59c8 100644
--- a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/androidResources.kt
+++ b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/androidResources.kt
@@ -26,6 +26,7 @@ import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
 import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.name.isValidJavaFqName
 import org.jetbrains.kotlin.serialization.deserialization.findClassAcrossModuleDependencies
 
 class AndroidVariant(val name: String, val resDirectories: List<String>) {
@@ -43,18 +44,35 @@ class AndroidModule(val applicationPackage: String, val variants: List<AndroidVa
     override fun hashCode() = applicationPackage.hashCode()
 }
 
-sealed class AndroidResource(val id: String, val sourceElement: PsiElement?) {
+class ResourceIdentifier(val name: String, val packageName: String?) {
+    // Without packageName
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other?.javaClass != javaClass) return false
+
+        other as ResourceIdentifier
+
+        if (name != other.name) return false
+        return true
+    }
+
+    override fun hashCode(): Int {
+        return name.hashCode()
+    }
+}
+
+sealed class AndroidResource(val id: ResourceIdentifier, val sourceElement: PsiElement?) {
     open fun sameClass(other: AndroidResource): Boolean = false
 
     class Widget(
-            id: String,
+            id: ResourceIdentifier,
             val xmlType: String,
             sourceElement: PsiElement?
     ) : AndroidResource(id, sourceElement) {
         override fun sameClass(other: AndroidResource) = other is Widget
     }
 
-    class Fragment(id: String, sourceElement: PsiElement?) : AndroidResource(id, sourceElement) {
+    class Fragment(id: ResourceIdentifier, sourceElement: PsiElement?) : AndroidResource(id, sourceElement) {
         override fun sameClass(other: AndroidResource) = other is Fragment
     }
 }
@@ -71,8 +89,15 @@ class ResolvedWidget(val widget: AndroidResource.Widget, val viewClassDescriptor
         get() = if (isErrorType) widget.xmlType else null
 }
 
-fun AndroidResource.Widget.resolve(module: ModuleDescriptor): ResolvedWidget {
-    fun resolve(fqName: String) = module.findClassAcrossModuleDependencies(ClassId.topLevel(FqName(fqName)))
+fun AndroidResource.Widget.resolve(module: ModuleDescriptor): ResolvedWidget? {
+    fun resolve(fqName: String): ClassDescriptor? {
+        if (!isValidJavaFqName(fqName)) return null
+        return module.findClassAcrossModuleDependencies(ClassId.topLevel(FqName(fqName)))
+    }
+
+    if (id.packageName != null && resolve(id.packageName + ".R") == null) {
+        return null
+    }
 
     if ('.' in xmlType) {
         return ResolvedWidget(this, resolve(xmlType))
diff --git a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/syntheticDescriptorGeneration.kt b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/syntheticDescriptorGeneration.kt
index 70851be6140..c8a6470c956 100644
--- a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/syntheticDescriptorGeneration.kt
+++ b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/syntheticDescriptorGeneration.kt
@@ -81,7 +81,7 @@ internal fun genPropertyForFragment(
 }
 
 private fun genProperty(
-        id: String,
+        id: ResourceIdentifier,
         receiverType: KotlinType,
         type: KotlinType,
         containingDeclaration: DeclarationDescriptor,
@@ -98,13 +98,14 @@ private fun genProperty(
             Modality.FINAL,
             Visibilities.PUBLIC,
             false,
-            Name.identifier(id),
+            Name.identifier(id.name),
             CallableMemberDescriptor.Kind.SYNTHESIZED,
             sourceElement,
             false,
             false) {
         override val errorType = errorType
         override val alwaysCastToView = alwaysCastToView
+        override val resourceId = id
     }
 
     val actualType = if (alwaysCastToView) context.viewType else type
@@ -139,6 +140,7 @@ interface AndroidSyntheticFunction
 interface AndroidSyntheticProperty {
     val errorType: String?
     val alwaysCastToView: Boolean
+    val resourceId: ResourceIdentifier
 
     val isErrorType: Boolean
         get() = errorType != null
diff --git a/plugins/android-extensions/android-extensions-idea/src/org/jetbrains/kotlin/android/synthetic/idea/AndroidSimpleNameReferenceExtension.kt b/plugins/android-extensions/android-extensions-idea/src/org/jetbrains/kotlin/android/synthetic/idea/AndroidSimpleNameReferenceExtension.kt
index 91fcf1b2a36..7ea5ef58763 100644
--- a/plugins/android-extensions/android-extensions-idea/src/org/jetbrains/kotlin/android/synthetic/idea/AndroidSimpleNameReferenceExtension.kt
+++ b/plugins/android-extensions/android-extensions-idea/src/org/jetbrains/kotlin/android/synthetic/idea/AndroidSimpleNameReferenceExtension.kt
@@ -36,6 +36,6 @@ class AndroidSimpleNameReferenceExtension : SimpleNameReferenceExtension {
         if (resolvedElement !is XmlAttributeValue || !AndroidResourceUtil.isIdDeclaration(resolvedElement)) return null
         val newSyntheticPropertyName = androidIdToName(newElementName) ?: return null
 
-        return psiFactory.createNameIdentifier(newSyntheticPropertyName)
+        return psiFactory.createNameIdentifier(newSyntheticPropertyName.name)
     }
 }
\ No newline at end of file
diff --git a/plugins/android-extensions/android-extensions-idea/src/org/jetbrains/kotlin/android/synthetic/idea/AndroidXmlVisitor.kt b/plugins/android-extensions/android-extensions-idea/src/org/jetbrains/kotlin/android/synthetic/idea/AndroidXmlVisitor.kt
index 39436c13647..1a507615c09 100644
--- a/plugins/android-extensions/android-extensions-idea/src/org/jetbrains/kotlin/android/synthetic/idea/AndroidXmlVisitor.kt
+++ b/plugins/android-extensions/android-extensions-idea/src/org/jetbrains/kotlin/android/synthetic/idea/AndroidXmlVisitor.kt
@@ -24,8 +24,9 @@ import com.intellij.psi.xml.XmlTag
 import org.jetbrains.kotlin.android.synthetic.AndroidConst
 import org.jetbrains.kotlin.android.synthetic.androidIdToName
 import org.jetbrains.kotlin.android.synthetic.isWidgetTypeIgnored
+import org.jetbrains.kotlin.android.synthetic.res.ResourceIdentifier
 
-class AndroidXmlVisitor(val elementCallback: (String, String, XmlAttribute) -> Unit) : XmlElementVisitor() {
+class AndroidXmlVisitor(val elementCallback: (ResourceIdentifier, String, XmlAttribute) -> Unit) : XmlElementVisitor() {
 
     override fun visitElement(element: PsiElement) {
         element.acceptChildren(this)
diff --git a/plugins/android-extensions/android-extensions-idea/src/org/jetbrains/kotlin/android/synthetic/idea/res/IDEAndroidLayoutXmlFileManager.kt b/plugins/android-extensions/android-extensions-idea/src/org/jetbrains/kotlin/android/synthetic/idea/res/IDEAndroidLayoutXmlFileManager.kt
index bf88bcf24db..af0c7ddd41a 100644
--- a/plugins/android-extensions/android-extensions-idea/src/org/jetbrains/kotlin/android/synthetic/idea/res/IDEAndroidLayoutXmlFileManager.kt
+++ b/plugins/android-extensions/android-extensions-idea/src/org/jetbrains/kotlin/android/synthetic/idea/res/IDEAndroidLayoutXmlFileManager.kt
@@ -84,7 +84,7 @@ class IDEAndroidLayoutXmlFileManager(val module: Module) : AndroidLayoutXmlFileM
 
             val attributes = arrayListOf<PsiElement>()
             val visitor = AndroidXmlVisitor { retId, wClass, valueElement ->
-                if (retId == propertyName) attributes.add(valueElement)
+                if (retId.name == propertyName) attributes.add(valueElement)
             }
 
             layoutFiles.forEach { it.accept(visitor) }