Fix NoActionBar themes rendering.

Also fix some warnings.

Bug: http://b.android.com/159780
Change-Id: I64fd4259b802722af7a271f51d5943018ed11e9e
diff --git a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/AppCompatActionBar.java b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/AppCompatActionBar.java
index e5023b8..f54815e 100644
--- a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/AppCompatActionBar.java
+++ b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/AppCompatActionBar.java
@@ -55,7 +55,7 @@
         View contentView = getDecorContent().findViewById(contentRootId);
         if (contentView != null) {
             assert contentView instanceof FrameLayout;
-            setContentRoot(((FrameLayout) contentView));
+            setContentRoot((FrameLayout) contentView);
         } else {
             // Something went wrong. Create a new FrameLayout in the enclosing layout.
             FrameLayout contentRoot = new FrameLayout(context);
@@ -104,8 +104,8 @@
     protected void setIcon(String icon) {
         // Do this only if the action bar doesn't already have an icon.
         if (icon != null && !icon.isEmpty() && mWindowDecorActionBar != null) {
-            if (((Boolean) invoke(getMethod(mWindowActionBarClass, "hasIcon"), mWindowDecorActionBar)
-            )) {
+            if (invoke(getMethod(mWindowActionBarClass, "hasIcon"), mWindowDecorActionBar)
+                    == Boolean.TRUE) {
                 Drawable iconDrawable = getDrawable(icon, false);
                 if (iconDrawable != null) {
                     Method setIcon = getMethod(mWindowActionBarClass, "setIcon", Drawable.class);
diff --git a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/BridgeActionBar.java b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/BridgeActionBar.java
index b29d25f..c25db35 100644
--- a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/BridgeActionBar.java
+++ b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/BridgeActionBar.java
@@ -44,6 +44,7 @@
     private final View mDecorContent;
     private final ActionBarCallback mCallback;
 
+    @SuppressWarnings("NullableProblems")  // Should be initialized by subclasses.
     @NonNull private FrameLayout mContentRoot;
 
     public BridgeActionBar(@NonNull BridgeContext context, @NonNull SessionParams params,
@@ -91,7 +92,7 @@
      */
     protected abstract ResourceValue getLayoutResource(BridgeContext context);
 
-    protected void setContentRoot(FrameLayout contentRoot) {
+    protected void setContentRoot(@NonNull FrameLayout contentRoot) {
         mContentRoot = contentRoot;
     }
 
diff --git a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/RenderSessionImpl.java b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/RenderSessionImpl.java
index 58acab9..b086355 100644
--- a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/RenderSessionImpl.java
+++ b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/RenderSessionImpl.java
@@ -1114,8 +1114,7 @@
             }
         } else {
             // action bar overrides title bar so only look for this one if action bar is hidden
-            boolean windowNoTitle = getBooleanThemeValue(resources,
-                    "windowNoTitle", false, !isThemeAppCompat(resources));
+            boolean windowNoTitle = getBooleanThemeValue(resources, "windowNoTitle", false, true);
 
             if (!windowNoTitle) {