Merge "Add support for aapt:attr attributes"
diff --git a/tools/layoutlib/bridge/src/android/content/res/BridgeTypedArray.java b/tools/layoutlib/bridge/src/android/content/res/BridgeTypedArray.java
index 9bc8e18..2c7e936 100644
--- a/tools/layoutlib/bridge/src/android/content/res/BridgeTypedArray.java
+++ b/tools/layoutlib/bridge/src/android/content/res/BridgeTypedArray.java
@@ -638,6 +638,9 @@
                 return mContext.getProjectResourceValue(ResourceType.ID, idName, defValue);
             }
         }
+        else if (value.startsWith("@aapt:_aapt")) {
+            return mContext.getLayoutlibCallback().getResourceId(ResourceType.AAPT, value);
+        }
 
         // not a direct id valid reference. First check if it's an enum (this is a corner case
         // for attributes that have a reference|enum type), then fallback to resolve
diff --git a/tools/layoutlib/bridge/src/android/content/res/Resources_Delegate.java b/tools/layoutlib/bridge/src/android/content/res/Resources_Delegate.java
index 6e3a8e8..c20ee12 100644
--- a/tools/layoutlib/bridge/src/android/content/res/Resources_Delegate.java
+++ b/tools/layoutlib/bridge/src/android/content/res/Resources_Delegate.java
@@ -131,9 +131,16 @@
         if (resourceInfo != null) {
             String attributeName = resourceInfo.getSecond();
             RenderResources renderResources = resources.mContext.getRenderResources();
-            return Pair.of(attributeName, platformResFlag_out[0] ?
+            ResourceValue value = platformResFlag_out[0] ?
                     renderResources.getFrameworkResource(resourceInfo.getFirst(), attributeName) :
-                    renderResources.getProjectResource(resourceInfo.getFirst(), attributeName));
+                    renderResources.getProjectResource(resourceInfo.getFirst(), attributeName);
+
+            if (value == null) {
+                // Unable to resolve the attribute, just leave the unresolved value
+                value = new ResourceValue(resourceInfo.getFirst(), attributeName, attributeName,
+                        platformResFlag_out[0]);
+            }
+            return Pair.of(attributeName, value);
         }
 
         return null;
diff --git a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/ResourceHelper.java b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/ResourceHelper.java
index b3a2d3e..f1e7b51 100644
--- a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/ResourceHelper.java
+++ b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/ResourceHelper.java
@@ -286,18 +286,15 @@
 
         Density density = Density.MEDIUM;
         if (value instanceof DensityBasedResourceValue) {
-            density =
-                ((DensityBasedResourceValue)value).getResourceDensity();
+            density = ((DensityBasedResourceValue) value).getResourceDensity();
         }
 
-
         if (lowerCaseValue.endsWith(NinePatch.EXTENSION_9PATCH)) {
             File file = new File(stringValue);
             if (file.isFile()) {
                 try {
-                    return getNinePatchDrawable(
-                            new FileInputStream(file), density, value.isFramework(),
-                            stringValue, context);
+                    return getNinePatchDrawable(new FileInputStream(file), density,
+                            value.isFramework(), stringValue, context);
                 } catch (IOException e) {
                     // failed to read the file, we'll return null below.
                     Bridge.getLog().error(LayoutLog.TAG_RESOURCES_READ,
@@ -306,30 +303,28 @@
             }
 
             return null;
-        } else if (lowerCaseValue.endsWith(".xml")) {
+        } else if (lowerCaseValue.endsWith(".xml") || stringValue.startsWith("@aapt:_aapt/")) {
             // create a block parser for the file
-            File f = new File(stringValue);
-            if (f.isFile()) {
-                try {
-                    // let the framework inflate the Drawable from the XML file.
-                    XmlPullParser parser = ParserFactory.create(f);
-
-                    BridgeXmlBlockParser blockParser = new BridgeXmlBlockParser(
-                            parser, context, value.isFramework());
-                    try {
-                        return Drawable.createFromXml(context.getResources(), blockParser, theme);
-                    } finally {
-                        blockParser.ensurePopped();
+            try {
+                XmlPullParser parser = context.getLayoutlibCallback().getParser(value);
+                if (parser == null) {
+                    File drawableFile = new File(stringValue);
+                    if (drawableFile.isFile()) {
+                        parser = ParserFactory.create(drawableFile);
                     }
-                } catch (Exception e) {
-                    // this is an error and not warning since the file existence is checked before
-                    // attempting to parse it.
-                    Bridge.getLog().error(null, "Failed to parse file " + stringValue,
-                            e, null /*data*/);
                 }
-            } else {
-                Bridge.getLog().error(LayoutLog.TAG_BROKEN,
-                        String.format("File %s does not exist (or is not a file)", stringValue),
+
+                BridgeXmlBlockParser blockParser =
+                        new BridgeXmlBlockParser(parser, context, value.isFramework());
+                try {
+                    return Drawable.createFromXml(context.getResources(), blockParser, theme);
+                } finally {
+                    blockParser.ensurePopped();
+                }
+            } catch (Exception e) {
+                // this is an error and not warning since the file existence is checked before
+                // attempting to parse it.
+                Bridge.getLog().error(null, "Failed to parse file " + stringValue, e,
                         null /*data*/);
             }
 
@@ -342,8 +337,8 @@
                             value.isFramework() ? null : context.getProjectKey());
 
                     if (bitmap == null) {
-                        bitmap = Bitmap_Delegate.createBitmap(bmpFile, false /*isMutable*/,
-                                density);
+                        bitmap =
+                                Bitmap_Delegate.createBitmap(bmpFile, false /*isMutable*/, density);
                         Bridge.setCachedBitmap(stringValue, bitmap,
                                 value.isFramework() ? null : context.getProjectKey());
                     }