181: Fix compatibility after AS 3.0 was merged to 181

idea/idea-android/src/org/jetbrains/kotlin/android/KotlinAndroidLineMarkerProvider.kt.181

@@ -0,0 +1,137 @@
+/*
+ * Copyright 2010-2017 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
+
+import com.android.SdkConstants
+import com.android.resources.ResourceType
+import com.intellij.codeHighlighting.Pass
+import com.intellij.codeInsight.daemon.GutterIconNavigationHandler
+import com.intellij.codeInsight.daemon.LineMarkerInfo
+import com.intellij.codeInsight.daemon.LineMarkerProvider
+import com.intellij.codeInsight.navigation.NavigationUtil
+import com.intellij.icons.AllIcons
+import com.intellij.ide.highlighter.XmlFileType
+import com.intellij.navigation.GotoRelatedItem
+import com.intellij.openapi.editor.markup.GutterIconRenderer
+import com.intellij.psi.PsiElement
+import com.intellij.psi.PsiFile
+import com.intellij.psi.xml.XmlAttributeValue
+import com.intellij.ui.awt.RelativePoint
+import com.intellij.util.Function
+import org.jetbrains.android.dom.manifest.Manifest
+import org.jetbrains.android.facet.AndroidFacet
+import org.jetbrains.android.resourceManagers.ModuleResourceManagers
+import org.jetbrains.kotlin.descriptors.ClassDescriptor
+import org.jetbrains.kotlin.idea.caches.resolve.unsafeResolveToDescriptor
+import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.resolve.lazy.BodyResolveMode
+import java.awt.event.MouseEvent
+import javax.swing.Icon
+
+
+class KotlinAndroidLineMarkerProvider : LineMarkerProvider {
+    override fun getLineMarkerInfo(element: PsiElement): LineMarkerInfo<*>? = null
+
+    override fun collectSlowLineMarkers(elements: List<PsiElement>, result: MutableCollection<LineMarkerInfo<PsiElement>>) {
+        elements.forEach {
+            (it as? KtClass)?.getLineMarkerInfo()?.let { marker -> result.add(marker) }
+        }
+    }
+
+    private fun KtClass.getLineMarkerInfo(): LineMarkerInfo<PsiElement>? {
+        val nameIdentifier = nameIdentifier ?: return null
+        val androidFacet = AndroidFacet.getInstance(this) ?: return null
+        val manifest = androidFacet.manifest ?: return null
+        val manifestItems = collectGoToRelatedManifestItems(manifest)
+        if (manifestItems.isEmpty() && !isClassWithLayoutXml()) {
+            return null
+        }
+
+        return LineMarkerInfo(
+                    nameIdentifier,
+                    nameIdentifier.textRange,
+                    AllIcons.FileTypes.Xml,
+                    Pass.LINE_MARKERS,
+                    Function { "Related XML file" },
+                    GutterIconNavigationHandler { e: MouseEvent, _: PsiElement ->
+                        NavigationUtil
+                                .getRelatedItemsPopup(
+                                        manifestItems + collectGoToRelatedLayoutItems(androidFacet),
+                                        "Go to Related Files")
+                                .show(RelativePoint(e))
+                    },
+                    GutterIconRenderer.Alignment.RIGHT)
+    }
+
+    private fun KtClass.collectGoToRelatedLayoutItems(androidFacet: AndroidFacet): List<GotoRelatedItem> {
+        val resources = mutableSetOf<PsiFile>()
+        accept(object: KtVisitorVoid() {
+            override fun visitKtElement(element: KtElement) {
+                element.acceptChildren(this)
+            }
+
+            override fun visitReferenceExpression(expression: KtReferenceExpression) {
+                super.visitReferenceExpression(expression)
+
+                val resClassName = ResourceType.LAYOUT.getName()
+                val info = (expression as? KtSimpleNameExpression)?.let {
+                    getReferredResourceOrManifestField(androidFacet, it, resClassName, true)
+                }
+
+                if (info == null || info.isFromManifest) {
+                    return
+                }
+
+                val files = ModuleResourceManagers
+                        .getInstance(androidFacet)
+                        .localResourceManager
+                        .findResourcesByFieldName(resClassName, info.fieldName)
+                        .filterIsInstance<PsiFile>()
+
+                resources.addAll(files)
+            }
+        })
+
+        return resources.map { GotoRelatedLayoutItem(it) }
+    }
+
+    private fun KtClass.collectGoToRelatedManifestItems(manifest: Manifest): List<GotoRelatedItem> =
+            findComponentDeclarationInManifest(manifest)?.xmlAttributeValue?.let { listOf(GotoManifestItem(it)) } ?: emptyList()
+
+    private class GotoManifestItem(attributeValue: XmlAttributeValue) : GotoRelatedItem(attributeValue) {
+        override fun getCustomName(): String? = "AndroidManifest.xml"
+        override fun getCustomContainerName(): String? = ""
+        override fun getCustomIcon(): Icon? = XmlFileType.INSTANCE.icon
+    }
+
+    private class GotoRelatedLayoutItem(private val file: PsiFile) : GotoRelatedItem(file, "Layout Files") {
+        override fun getCustomContainerName(): String? = "(${file.containingDirectory.name})"
+    }
+
+    companion object {
+        private val CLASSES_WITH_LAYOUT_XML = arrayOf(
+                SdkConstants.CLASS_ACTIVITY,
+                SdkConstants.CLASS_FRAGMENT,
+                SdkConstants.CLASS_V4_FRAGMENT,
+                "android.widget.Adapter")
+
+        private fun KtClass.isClassWithLayoutXml(): Boolean {
+            val type = (unsafeResolveToDescriptor(BodyResolveMode.PARTIAL) as? ClassDescriptor)?.defaultType ?: return false
+            return CLASSES_WITH_LAYOUT_XML.any { type.isSubclassOf(it, true) }
+        }
+    }
+}

idea/idea-android/src/org/jetbrains/kotlin/android/ResourceReferenceAnnotatorUtil.java.181

@@ -0,0 +1,270 @@
+/*
+ * Copyright 2010-2017 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;
+
+
+import com.android.ide.common.rendering.api.ResourceValue;
+import com.android.ide.common.resources.ResourceItem;
+import com.android.ide.common.resources.ResourceRepository;
+import com.android.ide.common.resources.ResourceResolver;
+import com.android.resources.ResourceType;
+import com.android.tools.idea.configurations.Configuration;
+import com.android.tools.idea.configurations.ConfigurationManager;
+import com.android.tools.idea.res.AppResourceRepository;
+import com.android.tools.idea.res.ResourceHelper;
+import com.android.tools.idea.ui.resourcechooser.ColorPicker;
+import com.android.utils.XmlUtils;
+import com.google.common.base.Charsets;
+import com.google.common.io.Files;
+import com.intellij.openapi.actionSystem.AnAction;
+import com.intellij.openapi.actionSystem.AnActionEvent;
+import com.intellij.openapi.actionSystem.CommonDataKeys;
+import com.intellij.openapi.application.ApplicationManager;
+import com.intellij.openapi.editor.Editor;
+import com.intellij.openapi.editor.markup.GutterIconRenderer;
+import com.intellij.openapi.module.Module;
+import com.intellij.openapi.project.Project;
+import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiFile;
+import com.intellij.psi.util.PsiTreeUtil;
+import com.intellij.psi.xml.XmlAttribute;
+import com.intellij.psi.xml.XmlAttributeValue;
+import com.intellij.psi.xml.XmlTag;
+import com.intellij.util.ui.ColorIcon;
+import com.intellij.util.ui.EmptyIcon;
+import com.intellij.util.ui.JBUI;
+import org.jetbrains.android.facet.AndroidFacet;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+
+import javax.swing.*;
+import java.awt.*;
+import java.io.File;
+
+import static com.android.SdkConstants.*;
+
+/**
+ *  Contains copied privates from AndroidColorAnnotator, so we could use them for Kotlin AndroidResourceReferenceAnnotator
+ */
+public class ResourceReferenceAnnotatorUtil {
+
+    public static final int ICON_SIZE = 8;
+
+    @Nullable
+    public static File pickBitmapFromXml(@NotNull File file, @NotNull ResourceResolver resourceResolver, @NotNull Project project) {
+        try {
+            String xml = Files.toString(file, Charsets.UTF_8);
+            Document document = XmlUtils.parseDocumentSilently(xml, true);
+            if (document != null && document.getDocumentElement() != null) {
+                Element root = document.getDocumentElement();
+                String tag = root.getTagName();
+                Element target = null;
+                String attribute = null;
+                if ("vector".equals(tag)) {
+                    // Vectors are handled in the icon cache
+                    return file;
+                }
+                else if ("bitmap".equals(tag) || "nine-patch".equals(tag)) {
+                    target = root;
+                    attribute = ATTR_SRC;
+                }
+                else if ("selector".equals(tag) ||
+                         "level-list".equals(tag) ||
+                         "layer-list".equals(tag) ||
+                         "transition".equals(tag)) {
+                    NodeList children = root.getChildNodes();
+                    for (int i = children.getLength() - 1; i >= 0; i--) {
+                        Node item = children.item(i);
+                        if (item.getNodeType() == Node.ELEMENT_NODE && TAG_ITEM.equals(item.getNodeName())) {
+                            target = (Element)item;
+                            if (target.hasAttributeNS(ANDROID_URI, ATTR_DRAWABLE)) {
+                                attribute = ATTR_DRAWABLE;
+                                break;
+                            }
+                        }
+                    }
+                }
+                else if ("clip".equals(tag) || "inset".equals(tag) || "scale".equals(tag)) {
+                    target = root;
+                    attribute = ATTR_DRAWABLE;
+                } else {
+                    // <shape> etc - no bitmap to be found
+                    return null;
+                }
+                if (attribute != null && target.hasAttributeNS(ANDROID_URI, attribute)) {
+                    String src = target.getAttributeNS(ANDROID_URI, attribute);
+                    ResourceValue value = resourceResolver.findResValue(src, false);
+                    if (value != null) {
+                        return ResourceHelper.resolveDrawable(resourceResolver, value, project);
+
+                    }
+                }
+            }
+        } catch (Throwable ignore) {
+            // Not logging for now; afraid to risk unexpected crashes in upcoming preview. TODO: Re-enable.
+            //Logger.getInstance(AndroidColorAnnotator.class).warn(String.format("Could not read/render icon image %1$s", file), e);
+        }
+
+        return null;
+    }
+
+    /** Looks up the resource item of the given type and name for the given configuration, if any */
+    @Nullable
+    public static ResourceValue findResourceValue(ResourceType type,
+            String name,
+            boolean isFramework,
+            Module module,
+            Configuration configuration) {
+        if (isFramework) {
+            ResourceRepository frameworkResources = configuration.getFrameworkResources();
+            if (frameworkResources == null) {
+                return null;
+            }
+            if (!frameworkResources.hasResourceItem(type, name)) {
+                return null;
+            }
+            ResourceItem item = frameworkResources.getResourceItem(type, name);
+            return item.getResourceValue(type, configuration.getFullConfig(), false);
+        } else {
+            AppResourceRepository appResources = AppResourceRepository.getOrCreateInstance(module);
+            if (appResources == null) {
+                return null;
+            }
+            if (!appResources.hasResourceItem(type, name)) {
+                return null;
+            }
+            return appResources.getConfiguredValue(type, name, configuration.getFullConfig());
+        }
+    }
+
+    /** Picks a suitable configuration to use for resource resolution */
+    @Nullable
+    public static Configuration pickConfiguration(AndroidFacet facet, Module module, PsiFile file) {
+        VirtualFile virtualFile = file.getVirtualFile();
+        if(virtualFile == null) {
+            return null;
+        } else {
+            VirtualFile parent = virtualFile.getParent();
+            if(parent == null) {
+                return null;
+            } else {
+                String parentName = parent.getName();
+                VirtualFile layout;
+                if(!parentName.startsWith("layout")) {
+                    layout = ResourceHelper.pickAnyLayoutFile(module, facet);
+                    if(layout == null) {
+                        return null;
+                    }
+                } else {
+                    layout = virtualFile;
+                }
+
+                return ConfigurationManager.getOrCreateInstance(module).getConfiguration(layout);
+            }
+        }
+    }
+
+    public static class ColorRenderer extends GutterIconRenderer {
+        private final PsiElement myElement;
+        private final Color myColor;
+
+        ColorRenderer(@NotNull PsiElement element, @Nullable Color color) {
+            myElement = element;
+            myColor = color;
+        }
+
+        @NotNull
+        @Override
+        public Icon getIcon() {
+            Color color = getCurrentColor();
+            return JBUI.scale(color == null ? EmptyIcon.create(ICON_SIZE) : new ColorIcon(ICON_SIZE, color));
+        }
+
+        @Nullable
+        private Color getCurrentColor() {
+            if (myColor != null) {
+                return myColor;
+            } else if (myElement instanceof XmlTag) {
+                return ResourceHelper.parseColor(((XmlTag)myElement).getValue().getText());
+            } else if (myElement instanceof XmlAttributeValue) {
+                return ResourceHelper.parseColor(((XmlAttributeValue)myElement).getValue());
+            } else {
+                return null;
+            }
+        }
+
+        @Override
+        public AnAction getClickAction() {
+            if (myColor != null) { // Cannot set colors that were derived
+                return null;
+            }
+            return new AnAction() {
+                @Override
+                public void actionPerformed(AnActionEvent e) {
+                    final Editor editor = CommonDataKeys.EDITOR.getData(e.getDataContext());
+                    if (editor != null) {
+                        // Need ARGB support in platform color chooser; see
+                        //  https://youtrack.jetbrains.com/issue/IDEA-123498
+                        //final Color color =
+                        //  ColorChooser.chooseColor(editor.getComponent(), AndroidBundle.message("android.choose.color"), getCurrentColor());
+                        final Color color = ColorPicker.showDialog(editor.getComponent(), "Choose Color", getCurrentColor(), true, null, false);
+                        if (color != null) {
+                            ApplicationManager.getApplication().runWriteAction(new Runnable() {
+                                @Override
+                                public void run() {
+                                    if (myElement instanceof XmlTag) {
+                                        ((XmlTag)myElement).getValue().setText(ResourceHelper.colorToString(color));
+                                    } else if (myElement instanceof XmlAttributeValue) {
+                                        XmlAttribute attribute = PsiTreeUtil.getParentOfType(myElement, XmlAttribute.class);
+                                        if (attribute != null) {
+                                            attribute.setValue(ResourceHelper.colorToString(color));
+                                        }
+                                    }
+                                }
+                            });
+                        }
+                    }
+                }
+            };
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+
+            ColorRenderer that = (ColorRenderer)o;
+            // TODO: Compare with modification count in app resources (if not framework)
+            if (myColor != null ? !myColor.equals(that.myColor) : that.myColor != null) return false;
+            if (!myElement.equals(that.myElement)) return false;
+
+            return true;
+        }
+
+        @Override
+        public int hashCode() {
+            int result = myElement.hashCode();
+            result = 31 * result + (myColor != null ? myColor.hashCode() : 0);
+            return result;
+        }
+    }
+}

idea/idea-android/src/org/jetbrains/kotlin/android/debugger/AndroidDexerImpl.kt.181

@@ -0,0 +1,73 @@
+/*
+ * Copyright 2010-2017 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.debugger
+
+import com.intellij.openapi.module.ModuleManager
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.roots.ProjectRootModificationTracker
+import com.intellij.psi.util.CachedValueProvider
+import com.intellij.psi.util.CachedValuesManager
+import org.jetbrains.android.facet.AndroidFacet
+import org.jetbrains.android.sdk.AndroidSdkData
+import org.jetbrains.kotlin.idea.debugger.evaluate.classLoading.AndroidDexer
+import org.jetbrains.kotlin.idea.debugger.evaluate.classLoading.ClassToLoad
+import java.io.File
+import java.net.URLClassLoader
+import java.security.ProtectionDomain
+
+class AndroidDexerImpl(val project: Project) : AndroidDexer {
+    private val cachedDexWrapper = CachedValuesManager.getManager(project).createCachedValue({
+        val dexWrapper = doGetAndroidDexFile()?.let { dexJarFile ->
+            val androidDexWrapperName = AndroidDexWrapper::class.java.canonicalName
+            val classBytes = this.javaClass.classLoader.getResource(
+                    androidDexWrapperName.replace('.', '/') + ".class").readBytes()
+
+            val dexClassLoader = object : URLClassLoader(arrayOf(dexJarFile.toURI().toURL()), this::class.java.classLoader) {
+                init {
+                    defineClass(androidDexWrapperName, classBytes, 0, classBytes.size, null as ProtectionDomain?)
+                }
+            }
+
+            Class.forName(androidDexWrapperName, true, dexClassLoader).newInstance()
+        }
+
+        CachedValueProvider.Result.createSingleDependency(dexWrapper, ProjectRootModificationTracker.getInstance(project))
+    }, /* trackValue = */ false)
+
+    override fun dex(classes: Collection<ClassToLoad>): ByteArray? {
+        val dexWrapper = cachedDexWrapper.value
+        val dexMethod = dexWrapper::class.java.methods.firstOrNull { it.name == "dex" } ?: return null
+        return dexMethod.invoke(dexWrapper, classes) as? ByteArray ?: return null
+    }
+
+    private fun doGetAndroidDexFile(): File? {
+        for (module in ModuleManager.getInstance(project).modules) {
+            val androidFacet = AndroidFacet.getInstance(module) ?: continue
+            val sdkData = AndroidSdkData.getSdkData(androidFacet) ?: continue
+            val latestBuildTool = sdkData.getLatestBuildTool(/* allowPreview = */ false)
+                                  ?: sdkData.getLatestBuildTool(/* allowPreview = */ true)
+                                  ?: continue
+
+            val dxJar = File(latestBuildTool.location, "lib/dx.jar")
+            if (dxJar.exists()) {
+                return dxJar
+            }
+        }
+
+        return null
+    }
+}

idea/idea-android/src/org/jetbrains/kotlin/android/folding/ResourceFoldingBuilder.kt.181

@@ -0,0 +1,258 @@
+/*
+ * Copyright 2010-2017 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.folding
+
+import com.android.SdkConstants.*
+import com.android.ide.common.resources.configuration.FolderConfiguration
+import com.android.ide.common.resources.configuration.LocaleQualifier
+import com.android.resources.ResourceType
+import com.android.tools.idea.folding.AndroidFoldingSettings
+import com.android.tools.idea.res.AppResourceRepository
+import com.android.tools.idea.res.LocalResourceRepository
+import com.intellij.lang.ASTNode
+import com.intellij.lang.folding.FoldingBuilderEx
+import com.intellij.lang.folding.FoldingDescriptor
+import com.intellij.openapi.application.ApplicationManager
+import com.intellij.openapi.components.ServiceManager
+import com.intellij.openapi.editor.Document
+import com.intellij.openapi.module.ModuleUtilCore
+import com.intellij.openapi.util.text.StringUtil
+import com.intellij.psi.PsiClass
+import com.intellij.psi.PsiElement
+import com.intellij.psi.impl.source.SourceTreeToPsiMap
+import org.jetbrains.android.facet.AndroidFacet
+import org.jetbrains.kotlin.psi.KtFile
+import org.jetbrains.uast.*
+import org.jetbrains.uast.visitor.AbstractUastVisitor
+import java.util.regex.Pattern
+
+
+class ResourceFoldingBuilder : FoldingBuilderEx() {
+
+    companion object {
+        // See lint's StringFormatDetector
+        private val FORMAT = Pattern.compile("%(\\d+\\$)?([-+#, 0(<]*)?(\\d+)?(\\.\\d+)?([tT])?([a-zA-Z%])")
+        private val FOLD_MAX_LENGTH = 60
+        private val UNIT_TEST_MODE: Boolean = ApplicationManager.getApplication().isUnitTestMode
+        private val RESOURCE_TYPES = listOf(ResourceType.STRING,
+                                            ResourceType.DIMEN,
+                                            ResourceType.INTEGER,
+                                            ResourceType.PLURALS)
+    }
+
+    private val isFoldingEnabled = AndroidFoldingSettings.getInstance().isCollapseAndroidStrings
+
+    override fun getPlaceholderText(node: ASTNode): String? {
+
+        tailrec fun UElement.unwrapReferenceAndGetValue(resources: LocalResourceRepository): String? = when (this) {
+            is UQualifiedReferenceExpression -> selector.unwrapReferenceAndGetValue(resources)
+            is UCallExpression -> (valueArguments.firstOrNull() as? UReferenceExpression)?.getAndroidResourceValue(resources, this)
+            else -> (this as? UReferenceExpression)?.getAndroidResourceValue(resources)
+        }
+
+        val element = SourceTreeToPsiMap.treeElementToPsi(node) ?: return null
+        val appResources = getAppResources(element) ?: return null
+        val uastContext = ServiceManager.getService(element.project, UastContext::class.java) ?: return null
+        return uastContext.convertElement(element, null, null)?.unwrapReferenceAndGetValue(appResources)
+    }
+
+    override fun buildFoldRegions(root: PsiElement, document: Document, quick: Boolean): Array<FoldingDescriptor> {
+        if (root !is KtFile || quick && !UNIT_TEST_MODE || !isFoldingEnabled || AndroidFacet.getInstance(root) == null) {
+            return emptyArray()
+        }
+
+        val file = root.toUElement()
+        val result = arrayListOf<FoldingDescriptor>()
+        file?.accept(object : AbstractUastVisitor() {
+            override fun visitSimpleNameReferenceExpression(node: USimpleNameReferenceExpression): Boolean {
+                node.getFoldingDescriptor()?.let { result.add(it) }
+                return super.visitSimpleNameReferenceExpression(node)
+            }
+        })
+
+        return result.toTypedArray()
+    }
+
+    override fun isCollapsedByDefault(node: ASTNode): Boolean = isFoldingEnabled
+
+    private fun UReferenceExpression.getFoldingDescriptor(): FoldingDescriptor? {
+        val resolved = resolve() ?: return null
+        val resourceType = resolved.getAndroidResourceType() ?: return null
+        if (resourceType !in RESOURCE_TYPES) return null
+
+        fun UElement.createFoldingDescriptor() = psi?.let { psi ->
+            val dependencies: Set<PsiElement> = setOf(psi)
+            FoldingDescriptor(psi.node, psi.textRange, null, dependencies)
+        }
+
+        val element = uastParent as? UQualifiedReferenceExpression ?: this
+        val getResourceValueCall = (element.uastParent as? UCallExpression)?.takeIf { it.isFoldableGetResourceValueCall() }
+        if (getResourceValueCall != null) {
+            val qualifiedCall = getResourceValueCall.uastParent as? UQualifiedReferenceExpression
+            if (qualifiedCall?.selector == getResourceValueCall) {
+                return qualifiedCall.createFoldingDescriptor()
+            }
+
+            return getResourceValueCall.createFoldingDescriptor()
+        }
+
+        return element.createFoldingDescriptor()
+    }
+
+    private fun UCallExpression.isFoldableGetResourceValueCall(): Boolean {
+        return methodName == "getString" ||
+               methodName == "getText" ||
+               methodName == "getInteger" ||
+               methodName?.startsWith("getDimension") ?: false ||
+               methodName?.startsWith("getQuantityString") ?: false
+    }
+
+    private fun PsiElement.getAndroidResourceType(): ResourceType? {
+        val elementType = parent as? PsiClass ?: return null
+        val elementPackage = elementType.parent as? PsiClass ?: return null
+        if (R_CLASS != elementPackage.name) return null
+        if (elementPackage.qualifiedName != "$ANDROID_PKG.$R_CLASS") {
+            return ResourceType.getEnum(elementType.name)
+        }
+
+        return null
+    }
+
+    private fun UReferenceExpression.getAndroidResourceValue(resources: LocalResourceRepository, call: UCallExpression? = null): String? {
+        val resourceType = resolve()?.getAndroidResourceType() ?: return null
+        val referenceConfig = FolderConfiguration().apply { localeQualifier = LocaleQualifier("xx") }
+        val key = resolvedName ?: return null
+        val resourceValue = resources.getResourceValue(resourceType, key, referenceConfig) ?: return null
+        val text = if (call != null) formatArguments(call, resourceValue) else resourceValue
+
+        if (resourceType == ResourceType.STRING || resourceType == ResourceType.PLURALS) {
+            return '"' + StringUtil.shortenTextWithEllipsis(text, FOLD_MAX_LENGTH - 2, 0) + '"'
+        }
+        else if (text.length <= 1) {
+            // Don't just inline empty or one-character replacements: they can't be expanded by a mouse click
+            // so are hard to use without knowing about the folding keyboard shortcut to toggle folding.
+            // This is similar to how IntelliJ 14 handles call parameters
+            return key + ": " + text
+        }
+
+        return StringUtil.shortenTextWithEllipsis(text, FOLD_MAX_LENGTH, 0)
+    }
+
+    private tailrec fun LocalResourceRepository.getResourceValue(
+            type: ResourceType,
+            name: String,
+            referenceConfig: FolderConfiguration): String? {
+        val value = getConfiguredValue(type, name, referenceConfig)?.value ?: return null
+        if (!value.startsWith('@')) {
+            return value
+        }
+
+        val (referencedTypeName, referencedName) = value.substring(1).split('/').takeIf { it.size == 2 } ?: return value
+        val referencedType = ResourceType.getEnum(referencedTypeName) ?: return value
+        return getResourceValue(referencedType, referencedName, referenceConfig)
+    }
+
+    // Converted from com.android.tools.idea.folding.InlinedResource#insertArguments
+    private fun formatArguments(callExpression: UCallExpression, formatString: String): String {
+        if (!formatString.contains('%')) {
+            return formatString
+        }
+
+        val args = callExpression.valueArguments
+        if (args.isEmpty() || !args.first().isPsiValid) {
+            return formatString
+        }
+
+        val matcher = FORMAT.matcher(formatString)
+        var index = 0
+        var prevIndex = 0
+        var nextNumber = 1
+        var start = 0
+        val sb = StringBuilder(2 * formatString.length)
+        while (true) {
+            if (matcher.find(index)) {
+                if ("%" == matcher.group(6)) {
+                    index = matcher.end()
+                    continue
+                }
+                val matchStart = matcher.start()
+                // Make sure this is not an escaped '%'
+                while (prevIndex < matchStart) {
+                    val c = formatString[prevIndex]
+                    if (c == '\\') {
+                        prevIndex++
+                    }
+                    prevIndex++
+                }
+                if (prevIndex > matchStart) {
+                    // We're in an escape, ignore this result
+                    index = prevIndex
+                    continue
+                }
+
+                index = matcher.end()
+
+                // Shouldn't throw a number format exception since we've already
+                // matched the pattern in the regexp
+                val number: Int
+                var numberString: String? = matcher.group(1)
+                if (numberString != null) {
+                    // Strip off trailing $
+                    numberString = numberString.substring(0, numberString.length - 1)
+                    number = Integer.parseInt(numberString)
+                    nextNumber = number + 1
+                }
+                else {
+                    number = nextNumber++
+                }
+
+                if (number > 0 && number < args.size) {
+                    val argExpression = args[number]
+                    var value: Any? = argExpression.evaluate()
+
+                    if (value == null) {
+                        value = args[number].asSourceString()
+                    }
+
+                    for (i in start..matchStart - 1) {
+                        sb.append(formatString[i])
+                    }
+
+                    sb.append("{")
+                    sb.append(value)
+                    sb.append('}')
+                    start = index
+                }
+            }
+            else {
+                var i = start
+                val n = formatString.length
+                while (i < n) {
+                    sb.append(formatString[i])
+                    i++
+                }
+                break
+            }
+        }
+
+        return sb.toString()
+    }
+
+    private fun getAppResources(element: PsiElement): LocalResourceRepository? = ModuleUtilCore.findModuleForPsiElement(element)?.let {
+        AppResourceRepository.findExistingInstance(it)
+    }
+}

idea/idea-android/src/org/jetbrains/kotlin/android/inspection/TypeParameterFindViewByIdInspection.kt.181

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2010-2017 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.inspection
+
+import com.android.tools.idea.model.AndroidModuleInfo
+import com.intellij.codeInspection.*
+import com.intellij.openapi.project.Project
+import com.intellij.psi.PsiElementVisitor
+import org.jetbrains.android.facet.AndroidFacet
+import org.jetbrains.kotlin.idea.caches.resolve.resolveToCall
+import org.jetbrains.kotlin.idea.inspections.AbstractKotlinInspection
+import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.psi.KtPsiUtil.isUnsafeCast
+import org.jetbrains.kotlin.psi.psiUtil.addTypeArgument
+
+class TypeParameterFindViewByIdInspection : AbstractKotlinInspection(), CleanupLocalInspectionTool {
+    override fun buildVisitor(holder: ProblemsHolder, isOnTheFly: Boolean, session: LocalInspectionToolSession): PsiElementVisitor {
+        val compileSdk = AndroidFacet.getInstance(session.file)
+                ?.let { facet -> AndroidModuleInfo.getInstance(facet) }
+                ?.buildSdkVersion
+                ?.apiLevel
+
+        if (compileSdk == null || compileSdk < 26) {
+            return KtVisitorVoid()
+        }
+
+        return object : KtVisitorVoid() {
+            override fun visitCallExpression(expression: KtCallExpression) {
+                super.visitCallExpression(expression)
+                if (expression.calleeExpression?.text != "findViewById" || expression.typeArguments.isNotEmpty()) {
+                    return
+                }
+
+                val parentCast = (expression.parent as? KtBinaryExpressionWithTypeRHS)?.takeIf { isUnsafeCast(it) } ?: return
+                val typeText = parentCast.right?.getTypeTextWithoutQuestionMark() ?: return
+                val callableDescriptor = expression.resolveToCall()?.resultingDescriptor ?: return
+                if (callableDescriptor.name.asString() != "findViewById" || callableDescriptor.typeParameters.size != 1) {
+                    return
+                }
+
+                holder.registerProblem(
+                        parentCast,
+                        "Can be converted to findViewById<$typeText>(...)",
+                        ConvertCastToFindViewByIdWithTypeParameter())
+            }
+        }
+    }
+
+    class ConvertCastToFindViewByIdWithTypeParameter : LocalQuickFix {
+        override fun getFamilyName(): String = "Convert cast to findViewById with type parameter"
+
+        override fun applyFix(project: Project, descriptor: ProblemDescriptor) {
+            val cast = descriptor.psiElement as? KtBinaryExpressionWithTypeRHS ?: return
+            val typeText = cast.right?.getTypeTextWithoutQuestionMark() ?: return
+            val call = cast.left as? KtCallExpression ?: return
+
+            val newCall = call.copy() as KtCallExpression
+            val typeArgument = KtPsiFactory(call).createTypeArgument(typeText)
+            newCall.addTypeArgument(typeArgument)
+
+            cast.replace(newCall)
+        }
+    }
+
+    companion object {
+        fun KtTypeReference.getTypeTextWithoutQuestionMark(): String? =
+                (typeElement as? KtNullableType)?.innerType?.text ?: typeElement?.text
+    }
+}

idea/idea-android/src/org/jetbrains/kotlin/android/navigation/KotlinAndroidGotoDeclarationHandler.java.181

@@ -0,0 +1,149 @@
+/*
+ * Copyright 2010-2015 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.navigation;
+
+import com.android.resources.ResourceType;
+import com.intellij.codeInsight.navigation.actions.GotoDeclarationHandler;
+import com.intellij.openapi.actionSystem.DataContext;
+import com.intellij.openapi.editor.Editor;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.xml.XmlElement;
+import org.jetbrains.android.dom.AndroidAttributeValue;
+import org.jetbrains.android.dom.manifest.Manifest;
+import org.jetbrains.android.dom.manifest.ManifestElementWithRequiredName;
+import org.jetbrains.android.dom.resources.Attr;
+import org.jetbrains.android.dom.resources.DeclareStyleable;
+import org.jetbrains.android.facet.AndroidFacet;
+import org.jetbrains.android.resourceManagers.LocalResourceManager;
+import org.jetbrains.android.resourceManagers.ModuleResourceManagers;
+import org.jetbrains.android.resourceManagers.ResourceManager;
+import org.jetbrains.android.util.AndroidResourceUtil;
+import org.jetbrains.android.util.AndroidUtils;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.jetbrains.kotlin.android.AndroidUtilKt;
+import org.jetbrains.kotlin.psi.KtSimpleNameExpression;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+// TODO: ask for extension point
+// this class is mostly copied from org.jetbrains.android.AndroidGotoDeclarationHandler
+public class KotlinAndroidGotoDeclarationHandler implements GotoDeclarationHandler {
+    @Override
+    public PsiElement[] getGotoDeclarationTargets(@Nullable PsiElement sourceElement, int offset, Editor editor) {
+        KtSimpleNameExpression referenceExpression = GotoResourceHelperKt.getReferenceExpression(sourceElement);
+        if (referenceExpression == null) {
+            return null;
+        }
+
+        AndroidFacet facet = AndroidUtilKt.getAndroidFacetForFile(referenceExpression);
+        if (facet == null) {
+            return null;
+        }
+
+        AndroidResourceUtil.MyReferredResourceFieldInfo info = GotoResourceHelperKt.getInfo(referenceExpression, facet);
+
+        if (info == null) return null;
+
+        String nestedClassName = info.getClassName();
+        String fieldName = info.getFieldName();
+        List<PsiElement> resourceList = new ArrayList<PsiElement>();
+
+        if (info.isFromManifest()) {
+            collectManifestElements(nestedClassName, fieldName, facet, resourceList);
+        }
+        else {
+            ModuleResourceManagers managers = ModuleResourceManagers.getInstance(facet);
+            ResourceManager manager = info.isSystem()
+                                      ? managers.getSystemResourceManager(false)
+                                      : managers.getLocalResourceManager();
+            if (manager == null) {
+                return null;
+            }
+            manager.collectLazyResourceElements(nestedClassName, fieldName, false, referenceExpression, resourceList);
+
+            if (manager instanceof LocalResourceManager) {
+                LocalResourceManager lrm = (LocalResourceManager) manager;
+
+                if (nestedClassName.equals(ResourceType.ATTR.getName())) {
+                    for (Attr attr : lrm.findAttrs(fieldName)) {
+                        resourceList.add(attr.getName().getXmlAttributeValue());
+                    }
+                }
+                else if (nestedClassName.equals(ResourceType.STYLEABLE.getName())) {
+                    for (DeclareStyleable styleable : lrm.findStyleables(fieldName)) {
+                        resourceList.add(styleable.getName().getXmlAttributeValue());
+                    }
+
+                    for (Attr styleable : lrm.findStyleableAttributesByFieldName(fieldName)) {
+                        resourceList.add(styleable.getName().getXmlAttributeValue());
+                    }
+                }
+            }
+        }
+
+        if (resourceList.size() > 1) {
+            // Sort to ensure the output is stable, and to prefer the base folders
+            Collections.sort(resourceList, AndroidResourceUtil.RESOURCE_ELEMENT_COMPARATOR);
+        }
+
+        return resourceList.toArray(new PsiElement[resourceList.size()]);
+    }
+
+    private static void collectManifestElements(
+            @NotNull String nestedClassName,
+            @NotNull String fieldName,
+            @NotNull AndroidFacet facet,
+            @NotNull List<PsiElement> result
+    ) {
+        Manifest manifest = facet.getManifest();
+
+        if (manifest == null) {
+            return;
+        }
+        List<? extends ManifestElementWithRequiredName> list;
+
+        if ("permission".equals(nestedClassName)) {
+            list = manifest.getPermissions();
+        }
+        else if ("permission_group".equals(nestedClassName)) {
+            list = manifest.getPermissionGroups();
+        }
+        else {
+            return;
+        }
+        for (ManifestElementWithRequiredName domElement : list) {
+            AndroidAttributeValue<String> nameAttribute = domElement.getName();
+            String name = nameAttribute.getValue();
+
+            if (AndroidUtils.equal(name, fieldName, false)) {
+                XmlElement psiElement = nameAttribute.getXmlAttributeValue();
+
+                if (psiElement != null) {
+                    result.add(psiElement);
+                }
+            }
+        }
+    }
+
+    @Override
+    public String getActionText(DataContext context) {
+        return null;
+    }
+}

idea/src/META-INF/android-lint.xml.181

@@ -0,0 +1,9 @@
+<idea-plugin>
+    <extensions defaultExtensionNs="com.intellij">
+        <externalAnnotator language="kotlin" implementationClass="org.jetbrains.android.inspections.lint.AndroidLintExternalAnnotator"/>
+    </extensions>
+
+    <extensions defaultExtensionNs="org.jetbrains.uast">
+        <uastLanguagePlugin implementation="org.jetbrains.uast.kotlin.KotlinUastLanguagePlugin"/>
+    </extensions>
+</idea-plugin>