LayoutLib: Fix true transparency in status bar.

Change-Id: Ieedf23cde9ab3e36c77501d30cc7e808e66a4782

4 files changed, 16 insertions, 12 deletions

diff --git a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/CustomBar.java b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/CustomBar.java
index b76ec17..567002e 100644
--- a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/CustomBar.java
+++ b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/CustomBar.java
@@ -33,6 +33,7 @@ import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlPullParserException;
 
 import android.annotation.NonNull;
+import android.annotation.Nullable;
 import android.content.res.ColorStateList;
 import android.graphics.Bitmap;
 import android.graphics.Bitmap_Delegate;
@@ -227,16 +228,18 @@ abstract class CustomBar extends LinearLayout {
      * Find the background color for this bar from the theme attributes. Only relevant to StatusBar
      * and NavigationBar.
      * <p/>
-     * Returns 0 if not found.
+     * Returns null if not found.
      *
      * @param colorAttrName the attribute name for the background color
      * @param translucentAttrName the attribute name for the translucency property of the bar.
      *
      * @throws NumberFormatException if color resolved to an invalid string.
      */
-    protected int getBarColor(@NonNull String colorAttrName, @NonNull String translucentAttrName) {
+    @Nullable
+    protected Integer getBarColor(@NonNull String colorAttrName,
+            @NonNull String translucentAttrName) {
         if (!Config.isGreaterOrEqual(mSimulatedPlatformVersion, LOLLIPOP)) {
-            return 0;
+            return null;
         }
         RenderResources renderResources = getContext().getRenderResources();
         // First check if the bar is translucent.
@@ -251,10 +254,11 @@ abstract class CustomBar extends LinearLayout {
         if (transparent) {
             return getColor(renderResources, colorAttrName);
         }
-        return 0;
+        return null;
     }
 
-    private static int getColor(RenderResources renderResources, String attr) {
+    @Nullable
+    private static Integer getColor(RenderResources renderResources, String attr) {
         // From ?attr/foo to @color/bar. This is most likely an ItemResourceValue.
         ResourceValue resource = renderResources.findItemInTheme(attr, true);
         // Form @color/bar to the #AARRGGBB
@@ -275,7 +279,7 @@ abstract class CustomBar extends LinearLayout {
                 }
             }
         }
-        return 0;
+        return null;
     }
 
     private ResourceValue getResourceValue(String reference) {
diff --git a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/NavigationBar.java b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/NavigationBar.java
index 9c89bfe..d50ce23 100644
--- a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/NavigationBar.java
+++ b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/NavigationBar.java
@@ -65,8 +65,8 @@ public class NavigationBar extends CustomBar {
         super(context, orientation, getShortestWidth(context)>= 600 ? LAYOUT_600DP_XML : LAYOUT_XML,
                 "navigation_bar.xml", simulatedPlatformVersion);
 
-        int color = getBarColor(ATTR_COLOR, ATTR_TRANSLUCENT);
-        setBackgroundColor(color == 0 ? 0xFF000000 : color);
+        Integer color = getBarColor(ATTR_COLOR, ATTR_TRANSLUCENT);
+        setBackgroundColor(color == null ? 0xFF000000 : color);
 
         // Cannot access the inside items through id because no R.id values have been
         // created for them.
diff --git a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/StatusBar.java b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/StatusBar.java
index 2dc7c65..95a5a58 100644
--- a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/StatusBar.java
+++ b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/StatusBar.java
@@ -71,8 +71,9 @@ public class StatusBar extends CustomBar {
         // FIXME: use FILL_H?
         setGravity(Gravity.START | Gravity.TOP | Gravity.RIGHT);
 
-        int color = getBarColor(ATTR_COLOR, ATTR_TRANSLUCENT);
-        setBackgroundColor(color == 0 ? Config.getStatusBarColor(simulatedPlatformVersion) : color);
+        Integer color = getBarColor(ATTR_COLOR, ATTR_TRANSLUCENT);
+        setBackgroundColor(
+                color == null ? Config.getStatusBarColor(simulatedPlatformVersion) : color);
 
         // Cannot access the inside items through id because no R.id values have been
         // created for them.
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 ac7c409..24e1ce7 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
@@ -421,8 +421,7 @@ public class RenderSessionImpl extends RenderAction<SessionParams> {
                     gc.setComposite(AlphaComposite.Src);
 
                     gc.setColor(new Color(0x00000000, true));
-                    gc.fillRect(0, 0,
-                            mMeasuredScreenWidth, mMeasuredScreenHeight);
+                    gc.fillRect(0, 0, mMeasuredScreenWidth, mMeasuredScreenHeight);
 
                     // done
                     gc.dispose();