Revert "LayoutLib: Fix true transparency in status bar."

This reverts commit 4eb298a941.

Even though this is techinically closer to what the framework does, the
fix is not complete. As a result, it looks worse when using AppCompat
themes. Revert the change for the release.

Change-Id: I67c1002ea17dee7234d78e2d13aab876467bd70f

tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/CustomBar.java

@@ -33,7 +33,6 @@ 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;
@@ -228,18 +227,16 @@ abstract class CustomBar extends LinearLayout {
      * Find the background color for this bar from the theme attributes. Only relevant to StatusBar
      * and NavigationBar.
      * <p/>
-     * Returns null if not found.
+     * Returns 0 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.
      */
-    @Nullable
-    protected Integer getBarColor(@NonNull String colorAttrName,
-            @NonNull String translucentAttrName) {
+    protected int getBarColor(@NonNull String colorAttrName, @NonNull String translucentAttrName) {
         if (!Config.isGreaterOrEqual(mSimulatedPlatformVersion, LOLLIPOP)) {
-            return null;
+            return 0;
         }
         RenderResources renderResources = getContext().getRenderResources();
         // First check if the bar is translucent.
@@ -254,11 +251,10 @@ abstract class CustomBar extends LinearLayout {
         if (transparent) {
             return getColor(renderResources, colorAttrName);
         }
-        return null;
+        return 0;
     }
 
-    @Nullable
-    private static Integer getColor(RenderResources renderResources, String attr) {
+    private static int 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
@@ -279,7 +275,7 @@ abstract class CustomBar extends LinearLayout {
                 }
             }
         }
-        return null;
+        return 0;
     }
 
     private ResourceValue getResourceValue(String reference) {

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);
 
-        Integer color = getBarColor(ATTR_COLOR, ATTR_TRANSLUCENT);
-        setBackgroundColor(color == null ? 0xFF000000 : color);
+        int color = getBarColor(ATTR_COLOR, ATTR_TRANSLUCENT);
+        setBackgroundColor(color == 0 ? 0xFF000000 : color);
 
         // Cannot access the inside items through id because no R.id values have been
         // created for them.

tools/layoutlib/bridge/src/com/android/layoutlib/bridge/bars/StatusBar.java

@@ -71,9 +71,8 @@ public class StatusBar extends CustomBar {
         // FIXME: use FILL_H?
         setGravity(Gravity.START | Gravity.TOP | Gravity.RIGHT);
 
-        Integer color = getBarColor(ATTR_COLOR, ATTR_TRANSLUCENT);
-        setBackgroundColor(
-                color == null ? Config.getStatusBarColor(simulatedPlatformVersion) : color);
+        int color = getBarColor(ATTR_COLOR, ATTR_TRANSLUCENT);
+        setBackgroundColor(color == 0 ? Config.getStatusBarColor(simulatedPlatformVersion) : color);
 
         // Cannot access the inside items through id because no R.id values have been
         // created for them.

tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/RenderSessionImpl.java

@@ -421,7 +421,8 @@ 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();