Fix layout rendering for RTL locales

This changeset adds the framework resources for RTL locales and mirrors
the layout if the application is RTL aware.

Use ICU to check the character orientation of the locale - right to left
or left to right. Set the layout direction on the top level layout
accordingly. Also, load the RTL resources for Nav Bar when the locale is
RTL.

Change-Id: I1ed0d516ab64120a0abca413ba678036661508f8

15 files changed, 81 insertions, 19 deletions

diff --git a/tools/layoutlib/bridge/.classpath b/tools/layoutlib/bridge/.classpath
index 3c124d9..2e4274d 100644
--- a/tools/layoutlib/bridge/.classpath
+++ b/tools/layoutlib/bridge/.classpath
@@ -7,5 +7,6 @@
 	<classpathentry kind="var" path="ANDROID_PLAT_SRC/out/host/common/obj/JAVA_LIBRARIES/temp_layoutlib_intermediates/javalib.jar" sourcepath="/ANDROID_PLAT_SRC/frameworks/base"/>
 	<classpathentry kind="var" path="ANDROID_PLAT_SRC/prebuilts/misc/common/ninepatch/ninepatch-prebuilt.jar"/>
 	<classpathentry kind="var" path="ANDROID_PLAT_SRC/prebuilts/misc/common/tools-common/tools-common-prebuilt.jar"/>
+	<classpathentry kind="var" path="ANDROID_PLAT_SRC/prebuilts/misc/common/icu4j/icu4j.jar"/>
 	<classpathentry kind="output" path="bin"/>
 </classpath>
diff --git a/tools/layoutlib/bridge/Android.mk b/tools/layoutlib/bridge/Android.mk
index 687a91f..e3d48fc 100644
--- a/tools/layoutlib/bridge/Android.mk
+++ b/tools/layoutlib/bridge/Android.mk
@@ -22,6 +22,7 @@ LOCAL_JAVA_RESOURCE_DIRS := resources
 
 LOCAL_JAVA_LIBRARIES := \
 	kxml2-2.3.0 \
+	icu4j \
 	layoutlib_api-prebuilt \
 	tools-common-prebuilt
 
diff --git a/tools/layoutlib/bridge/resources/bars/ldrtl-hdpi/ic_sysbar_back.png b/tools/layoutlib/bridge/resources/bars/ldrtl-hdpi/ic_sysbar_back.png
new file mode 100644
index 0000000..782ebfe
--- /dev/null
+++ b/tools/layoutlib/bridge/resources/bars/ldrtl-hdpi/ic_sysbar_back.png
diff --git a/tools/layoutlib/bridge/resources/bars/ldrtl-hdpi/ic_sysbar_recent.png b/tools/layoutlib/bridge/resources/bars/ldrtl-hdpi/ic_sysbar_recent.png
new file mode 100644
index 0000000..677b471
--- /dev/null
+++ b/tools/layoutlib/bridge/resources/bars/ldrtl-hdpi/ic_sysbar_recent.png
diff --git a/tools/layoutlib/bridge/resources/bars/ldrtl-mdpi/ic_sysbar_back.png b/tools/layoutlib/bridge/resources/bars/ldrtl-mdpi/ic_sysbar_back.png
new file mode 100644
index 0000000..a1b8062
--- /dev/null
+++ b/tools/layoutlib/bridge/resources/bars/ldrtl-mdpi/ic_sysbar_back.png
diff --git a/tools/layoutlib/bridge/resources/bars/ldrtl-mdpi/ic_sysbar_recent.png b/tools/layoutlib/bridge/resources/bars/ldrtl-mdpi/ic_sysbar_recent.png
new file mode 100644
index 0000000..fcdbefe
--- /dev/null
+++ b/tools/layoutlib/bridge/resources/bars/ldrtl-mdpi/ic_sysbar_recent.png
diff --git a/tools/layoutlib/bridge/resources/bars/ldrtl-xhdpi/ic_sysbar_back.png b/tools/layoutlib/bridge/resources/bars/ldrtl-xhdpi/ic_sysbar_back.png
new file mode 100644
index 0000000..633d864
--- /dev/null
+++ b/tools/layoutlib/bridge/resources/bars/ldrtl-xhdpi/ic_sysbar_back.png
diff --git a/tools/layoutlib/bridge/resources/bars/ldrtl-xhdpi/ic_sysbar_recent.png b/tools/layoutlib/bridge/resources/bars/ldrtl-xhdpi/ic_sysbar_recent.png
new file mode 100644
index 0000000..4665e2a
--- /dev/null
+++ b/tools/layoutlib/bridge/resources/bars/ldrtl-xhdpi/ic_sysbar_recent.png
diff --git a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/Bridge.java b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/Bridge.java
index 42257c5..ab4be71 100644
--- a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/Bridge.java
+++ b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/Bridge.java
@@ -35,6 +35,7 @@ import com.android.resources.ResourceType;
 import com.android.tools.layoutlib.create.MethodAdapter;
 import com.android.tools.layoutlib.create.OverrideMethod;
 import com.android.util.Pair;
+import com.ibm.icu.util.ULocale;
 
 import android.content.res.BridgeAssetManager;
 import android.graphics.Bitmap;
@@ -64,6 +65,8 @@ import java.util.concurrent.locks.ReentrantLock;
  */
 public final class Bridge extends com.android.ide.common.rendering.api.Bridge {
 
+    private static final String ICU_LOCALE_DIRECTION_RTL = "right-to-left";
+
     public static class StaticMethodNotImplementedException extends RuntimeException {
         private static final long serialVersionUID = 1L;
 
@@ -211,7 +214,8 @@ public final class Bridge extends com.android.ide.common.rendering.api.Bridge {
                 Capability.ANIMATED_VIEW_MANIPULATION,
                 Capability.ADAPTER_BINDING,
                 Capability.EXTENDED_VIEWINFO,
-                Capability.FIXED_SCALABLE_NINE_PATCH);
+                Capability.FIXED_SCALABLE_NINE_PATCH,
+                Capability.RTL);
 
 
         BridgeAssetManager.initSystem();
@@ -411,6 +415,20 @@ public final class Bridge extends com.android.ide.common.rendering.api.Bridge {
         throw new IllegalArgumentException("viewObject is not a View");
     }
 
+    @Override
+    public boolean isRtl(String locale) {
+        return isLocaleRtl(locale);
+    }
+
+    public static boolean isLocaleRtl(String locale) {
+        if (locale == null) {
+            locale = "";
+        }
+        ULocale uLocale = new ULocale(locale);
+        return uLocale.getCharacterOrientation().equals(ICU_LOCALE_DIRECTION_RTL) ?
+                true : false;
+    }
+
     /**
      * Returns the lock for the bridge
      */
diff --git a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/android/BridgeContext.java b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/android/BridgeContext.java
index 21bef1c..99aa228 100644
--- a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/android/BridgeContext.java
+++ b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/android/BridgeContext.java
@@ -132,7 +132,8 @@ public final class BridgeContext extends Context {
             RenderResources renderResources,
             IProjectCallback projectCallback,
             Configuration config,
-            int targetSdkVersion) {
+            int targetSdkVersion,
+            boolean hasRtlSupport) {
         mProjectKey = projectKey;
         mMetrics = metrics;
         mProjectCallback = projectCallback;
@@ -142,6 +143,9 @@ public final class BridgeContext extends Context {
 
         mApplicationInfo = new ApplicationInfo();
         mApplicationInfo.targetSdkVersion = targetSdkVersion;
+        if (hasRtlSupport) {
+            mApplicationInfo.flags = mApplicationInfo.flags | ApplicationInfo.FLAG_SUPPORTS_RTL;
+        }
 
         mWindowManager = new WindowManagerImpl(mMetrics);
     }
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 ea9d8d9..17b0eb6 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
@@ -25,6 +25,7 @@ import com.android.layoutlib.bridge.android.BridgeXmlBlockParser;
 import com.android.layoutlib.bridge.impl.ParserFactory;
 import com.android.layoutlib.bridge.impl.ResourceHelper;
 import com.android.resources.Density;
+import com.android.resources.LayoutDirection;
 import com.android.resources.ResourceType;
 
 import org.xmlpull.v1.XmlPullParser;
@@ -86,38 +87,53 @@ abstract class CustomBar extends LinearLayout {
         }
     }
 
-    private InputStream getIcon(String iconName, Density[] densityInOut, String[] pathOut,
-            boolean tryOtherDensities) {
+    private InputStream getIcon(String iconName, Density[] densityInOut, LayoutDirection direction, 
+            String[] pathOut, boolean tryOtherDensities) {
         // current density
         Density density = densityInOut[0];
 
         // bitmap url relative to this class
-        pathOut[0] = "/bars/" + density.getResourceValue() + "/" + iconName;
+        if (direction != null) {
+            pathOut[0] = "/bars/" + direction.getResourceValue() + "-" + density.getResourceValue()
+                    + "/" + iconName;
+        } else {
+            pathOut[0] = "/bars/" + density.getResourceValue() + "/" + iconName;
+        }
 
         InputStream stream = getClass().getResourceAsStream(pathOut[0]);
         if (stream == null && tryOtherDensities) {
             for (Density d : Density.values()) {
                 if (d != density) {
                     densityInOut[0] = d;
-                    stream = getIcon(iconName, densityInOut, pathOut, false /*tryOtherDensities*/);
+                    stream = getIcon(iconName, densityInOut, direction, pathOut,
+                            false /*tryOtherDensities*/);
                     if (stream != null) {
                         return stream;
                     }
                 }
             }
+            // couldn't find resource with direction qualifier. try without.
+            if (direction != null) {
+                return getIcon(iconName, densityInOut, null, pathOut, true);
+            }
         }
 
         return stream;
     }
 
     protected void loadIcon(int index, String iconName, Density density) {
+        loadIcon(index, iconName, density, false);
+    }
+
+    protected void loadIcon(int index, String iconName, Density density, boolean isRtl) {
         View child = getChildAt(index);
         if (child instanceof ImageView) {
             ImageView imageView = (ImageView) child;
 
             String[] pathOut = new String[1];
             Density[] densityInOut = new Density[] { density };
-            InputStream stream = getIcon(iconName, densityInOut, pathOut,
+            LayoutDirection dir = isRtl ? LayoutDirection.RTL : LayoutDirection.LTR;
+            InputStream stream = getIcon(iconName, densityInOut, dir, pathOut,
                     true /*tryOtherDensities*/);
             density = densityInOut[0];
 
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 cc90d6b..84e676e 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
@@ -17,6 +17,7 @@
 package com.android.layoutlib.bridge.bars;
 
 import com.android.resources.Density;
+import com.android.layoutlib.bridge.Bridge;
 
 import org.xmlpull.v1.XmlPullParserException;
 
@@ -26,7 +27,8 @@ import android.widget.TextView;
 
 public class NavigationBar extends CustomBar {
 
-    public NavigationBar(Context context, Density density, int orientation) throws XmlPullParserException {
+    public NavigationBar(Context context, Density density, int orientation, boolean isRtl,
+            boolean rtlEnabled) throws XmlPullParserException {
         super(context, density, orientation, "/bars/navigation_bar.xml", "navigation_bar.xml");
 
         setBackgroundColor(0xFF000000);
@@ -37,14 +39,15 @@ public class NavigationBar extends CustomBar {
         // 0 is a spacer.
         int back = 1;
         int recent = 3;
-        if (orientation == LinearLayout.VERTICAL) {
+        if (orientation == LinearLayout.VERTICAL || (isRtl && !rtlEnabled)) {
+            // If RTL is enabled, then layoutlib mirrors the layout for us.
             back = 3;
             recent = 1;
         }
 
-        loadIcon(back,   "ic_sysbar_back.png", density);
-        loadIcon(2,      "ic_sysbar_home.png", density);
-        loadIcon(recent, "ic_sysbar_recent.png", density);
+        loadIcon(back,   "ic_sysbar_back.png",   density, isRtl);
+        loadIcon(2,      "ic_sysbar_home.png",   density, isRtl);
+        loadIcon(recent, "ic_sysbar_recent.png", density, isRtl);
     }
 
     @Override
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 5c08412..baa956d 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
@@ -30,7 +30,10 @@ import android.widget.TextView;
 
 public class StatusBar extends CustomBar {
 
-    public StatusBar(Context context, Density density) throws XmlPullParserException {
+    public StatusBar(Context context, Density density, int direction, boolean RtlEnabled)
+            throws XmlPullParserException {
+        // FIXME: if direction is RTL but it's not enabled in application manifest, mirror this bar.
+
         super(context, density, LinearLayout.HORIZONTAL, "/bars/status_bar.xml", "status_bar.xml");
 
         // FIXME: use FILL_H?
diff --git a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/RenderAction.java b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/RenderAction.java
index b909bec..87047b3 100644
--- a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/RenderAction.java
+++ b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/RenderAction.java
@@ -121,7 +121,8 @@ public abstract class RenderAction<T extends RenderParams> extends FrameworkReso
 
         // build the context
         mContext = new BridgeContext(mParams.getProjectKey(), metrics, resources,
-                mParams.getProjectCallback(), getConfiguration(), mParams.getTargetSdkVersion());
+                mParams.getProjectCallback(), getConfiguration(), mParams.getTargetSdkVersion(),
+                mParams.isRtlSupported());
 
         setUp();
 
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 c14af4a..9ddbbf1 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
@@ -225,13 +225,15 @@ public class RenderSessionImpl extends RenderAction<SessionParams> {
             SessionParams params = getParams();
             HardwareConfig hardwareConfig = params.getHardwareConfig();
             BridgeContext context = getContext();
-
+            boolean isRtl = Bridge.isLocaleRtl(params.getLocale());
+            int direction = isRtl ? View.LAYOUT_DIRECTION_RTL : View.LAYOUT_DIRECTION_LTR;
 
             // the view group that receives the window background.
             ViewGroup backgroundView = null;
 
             if (mWindowIsFloating || params.isForceNoDecor()) {
                 backgroundView = mViewRoot = mContentRoot = new FrameLayout(context);
+                mViewRoot.setLayoutDirection(direction);
             } else {
                 if (hasSoftwareButtons() && mNavigationBarOrientation == LinearLayout.VERTICAL) {
                     /*
@@ -253,12 +255,14 @@ public class RenderSessionImpl extends RenderAction<SessionParams> {
                        the bottom
                      */
                     LinearLayout topLayout = new LinearLayout(context);
+                    topLayout.setLayoutDirection(direction);
                     mViewRoot = topLayout;
                     topLayout.setOrientation(LinearLayout.HORIZONTAL);
 
                     try {
                         NavigationBar navigationBar = new NavigationBar(context,
-                                hardwareConfig.getDensity(), LinearLayout.VERTICAL);
+                                hardwareConfig.getDensity(), LinearLayout.VERTICAL, isRtl,
+                                params.isRtlSupported());
                         navigationBar.setLayoutParams(
                                 new LinearLayout.LayoutParams(
                                         mNavigationBarSize,
@@ -290,6 +294,7 @@ public class RenderSessionImpl extends RenderAction<SessionParams> {
 
                 LinearLayout topLayout = new LinearLayout(context);
                 topLayout.setOrientation(LinearLayout.VERTICAL);
+                topLayout.setLayoutDirection(direction);
                 // if we don't already have a view root this is it
                 if (mViewRoot == null) {
                     mViewRoot = topLayout;
@@ -301,13 +306,22 @@ public class RenderSessionImpl extends RenderAction<SessionParams> {
 
                     // this is the case of soft buttons + vertical bar.
                     // this top layout is the first layout in the horizontal layout. see above)
-                    mViewRoot.addView(topLayout, 0);
+                    if (isRtl && params.isRtlSupported()) {
+                        // If RTL is enabled, layoutlib will mirror the layouts. So, add the
+                        // topLayout to the right of Navigation Bar and layoutlib will draw it
+                        // to the left.
+                        mViewRoot.addView(topLayout);
+                    } else {
+                        // Add the top layout to the left of the Navigation Bar.
+                        mViewRoot.addView(topLayout, 0);
+                    }
                 }
 
                 if (mStatusBarSize > 0) {
                     // system bar
                     try {
-                        StatusBar systemBar = new StatusBar(context, hardwareConfig.getDensity());
+                        StatusBar systemBar = new StatusBar(context, hardwareConfig.getDensity(),
+                                direction, params.isRtlSupported());
                         systemBar.setLayoutParams(
                                 new LinearLayout.LayoutParams(
                                         LayoutParams.MATCH_PARENT, mStatusBarSize));
@@ -366,7 +380,8 @@ public class RenderSessionImpl extends RenderAction<SessionParams> {
                     // system bar
                     try {
                         NavigationBar navigationBar = new NavigationBar(context,
-                                hardwareConfig.getDensity(), LinearLayout.HORIZONTAL);
+                                hardwareConfig.getDensity(), LinearLayout.HORIZONTAL, isRtl,
+                                params.isRtlSupported());
                         navigationBar.setLayoutParams(
                                 new LinearLayout.LayoutParams(
                                         LayoutParams.MATCH_PARENT, mNavigationBarSize));