Work on issue #4518815: Compatibility mode introduces compatibility regression...

...for Market App iRunner

There were a lot of serious issues with how we updated (or often didn't update)
the display and resource state when switching compatibility mode in conjunction
with restarting and updating application components.  This addresses everything
I could find.

Unfortunately it does *not* fix this particular app.  I am starting to think this
is just an issue in the app.  This change does fix a number of other problems
I could repro, such as switching the compatibility mode of an IME.

Also a few changes here and there to get rid of $#*&^!! debug logs.

Change-Id: Ib15572eac9ec93b4b9966ddcbbc830ce9dec1317

13 files changed, 306 insertions, 90 deletions

diff --git a/core/java/android/app/ActivityThread.java b/core/java/android/app/ActivityThread.java
index a61147a..6c63c2a 100644
--- a/core/java/android/app/ActivityThread.java
+++ b/core/java/android/app/ActivityThread.java
@@ -155,7 +155,9 @@ public final class ActivityThread {
             = new HashMap<IBinder, Service>();
     AppBindData mBoundApplication;
     Configuration mConfiguration;
+    Configuration mCompatConfiguration;
     Configuration mResConfiguration;
+    CompatibilityInfo mResCompatibilityInfo;
     Application mInitialApplication;
     final ArrayList<Application> mAllApplications
             = new ArrayList<Application>();
@@ -181,8 +183,8 @@ public final class ActivityThread {
             = new HashMap<String, WeakReference<LoadedApk>>();
     final HashMap<String, WeakReference<LoadedApk>> mResourcePackages
             = new HashMap<String, WeakReference<LoadedApk>>();
-    Display mDisplay = null;
-    DisplayMetrics mDisplayMetrics = null;
+    final HashMap<CompatibilityInfo, DisplayMetrics> mDisplayMetrics
+            = new HashMap<CompatibilityInfo, DisplayMetrics>();
     final HashMap<ResourcesKey, WeakReference<Resources> > mActiveResources
             = new HashMap<ResourcesKey, WeakReference<Resources> >();
     final ArrayList<ActivityClientRecord> mRelaunchingActivities
@@ -1267,20 +1269,45 @@ public final class ActivityThread {
         return sPackageManager;
     }
 
-    DisplayMetrics getDisplayMetricsLocked(boolean forceUpdate) {
-        if (mDisplayMetrics != null && !forceUpdate) {
-            return mDisplayMetrics;
+    DisplayMetrics getDisplayMetricsLocked(CompatibilityInfo ci, boolean forceUpdate) {
+        DisplayMetrics dm = mDisplayMetrics.get(ci);
+        if (dm != null && !forceUpdate) {
+            return dm;
         }
-        if (mDisplay == null) {
-            WindowManager wm = WindowManagerImpl.getDefault();
-            mDisplay = wm.getDefaultDisplay();
+        if (dm == null) {
+            dm = new DisplayMetrics();
+            mDisplayMetrics.put(ci, dm);
         }
-        DisplayMetrics metrics = mDisplayMetrics = new DisplayMetrics();
-        mDisplay.getMetrics(metrics);
+        Display d = WindowManagerImpl.getDefault(ci).getDefaultDisplay();
+        d.getMetrics(dm);
         //Slog.i("foo", "New metrics: w=" + metrics.widthPixels + " h="
         //        + metrics.heightPixels + " den=" + metrics.density
         //        + " xdpi=" + metrics.xdpi + " ydpi=" + metrics.ydpi);
-        return metrics;
+        return dm;
+    }
+
+    static Configuration applyConfigCompat(Configuration config, CompatibilityInfo compat) {
+        if (config == null) {
+            return null;
+        }
+        if (compat != null && !compat.supportsScreen()) {
+            config = new Configuration(config);
+            compat.applyToConfiguration(config);
+        }
+        return config;
+    }
+
+    private final Configuration mMainThreadConfig = new Configuration();
+    Configuration applyConfigCompatMainThread(Configuration config, CompatibilityInfo compat) {
+        if (config == null) {
+            return null;
+        }
+        if (compat != null && !compat.supportsScreen()) {
+            mMainThreadConfig.setTo(config);
+            config = mMainThreadConfig;
+            compat.applyToConfiguration(config);
+        }
+        return config;
     }
 
     /**
@@ -1322,7 +1349,7 @@ public final class ActivityThread {
         }
 
         //Slog.i(TAG, "Resource: key=" + key + ", display metrics=" + metrics);
-        DisplayMetrics metrics = getDisplayMetricsLocked(false);
+        DisplayMetrics metrics = getDisplayMetricsLocked(compInfo, false);
         r = new Resources(assets, metrics, getConfiguration(), compInfo);
         if (false) {
             Slog.i(TAG, "Created app resources " + resDir + " " + r + ": "
@@ -1350,7 +1377,7 @@ public final class ActivityThread {
      * Creates the top level resources for the given package.
      */
     Resources getTopLevelResources(String resDir, LoadedApk pkgInfo) {
-        return getTopLevelResources(resDir, pkgInfo.mCompatibilityInfo);
+        return getTopLevelResources(resDir, pkgInfo.mCompatibilityInfo.get());
     }
 
     final Handler getHandler() {
@@ -1517,7 +1544,8 @@ public final class ActivityThread {
                         CompatibilityInfo.DEFAULT_COMPATIBILITY_INFO);
                 context.init(info, null, this);
                 context.getResources().updateConfiguration(
-                        getConfiguration(), getDisplayMetricsLocked(false));
+                        getConfiguration(), getDisplayMetricsLocked(
+                                CompatibilityInfo.DEFAULT_COMPATIBILITY_INFO, false));
                 mSystemContext = context;
                 //Slog.i(TAG, "Created system resources " + context.getResources()
                 //        + ": " + context.getResources().getConfiguration());
@@ -1730,7 +1758,7 @@ public final class ActivityThread {
                 appContext.init(r.packageInfo, r.token, this);
                 appContext.setOuterContext(activity);
                 CharSequence title = r.activityInfo.loadLabel(appContext.getPackageManager());
-                Configuration config = new Configuration(mConfiguration);
+                Configuration config = new Configuration(mCompatConfiguration);
                 if (DEBUG_CONFIGURATION) Slog.v(TAG, "Launching activity "
                         + r.activityInfo.name + " with config " + config);
                 activity.attach(appContext, this, getInstrumentation(), r.token,
@@ -2763,13 +2791,14 @@ public final class ActivityThread {
     private void handleUpdatePackageCompatibilityInfo(UpdateCompatibilityData data) {
         LoadedApk apk = peekPackageInfo(data.pkg, false);
         if (apk != null) {
-            apk.mCompatibilityInfo = data.info;
+            apk.mCompatibilityInfo.set(data.info);
         }
         apk = peekPackageInfo(data.pkg, true);
         if (apk != null) {
-            apk.mCompatibilityInfo = data.info;
+            apk.mCompatibilityInfo.set(data.info);
         }
         handleConfigurationChanged(mConfiguration, data.info);
+        WindowManagerImpl.getDefault().reportNewConfiguration(mConfiguration);
     }
 
     private final void deliverResults(ActivityClientRecord r, List<ResultInfo> results) {
@@ -3192,20 +3221,22 @@ public final class ActivityThread {
                 ActivityClientRecord ar = it.next();
                 Activity a = ar.activity;
                 if (a != null) {
+                    Configuration thisConfig = applyConfigCompatMainThread(newConfig,
+                            ar.packageInfo.mCompatibilityInfo.getIfNeeded());
                     if (!ar.activity.mFinished && (allActivities ||
                             (a != null && !ar.paused))) {
                         // If the activity is currently resumed, its configuration
                         // needs to change right now.
                         callbacks.add(a);
-                    } else if (newConfig != null) {
+                    } else if (thisConfig != null) {
                         // Otherwise, we will tell it about the change
                         // the next time it is resumed or shown.  Note that
                         // the activity manager may, before then, decide the
                         // activity needs to be destroyed to handle its new
                         // configuration.
                         if (DEBUG_CONFIGURATION) Slog.v(TAG, "Setting activity "
-                                + ar.activityInfo.name + " newConfig=" + newConfig);
-                        ar.newConfig = newConfig;
+                                + ar.activityInfo.name + " newConfig=" + thisConfig);
+                        ar.newConfig = thisConfig;
                     }
                 }
             }
@@ -3252,7 +3283,6 @@ public final class ActivityThread {
             // onConfigurationChanged
             int diff = activity.mCurrentConfig.diff(config);
             if (diff != 0) {
-
                 // If this activity doesn't handle any of the config changes
                 // then don't bother calling onConfigurationChanged as we're
                 // going to destroy it.
@@ -3296,7 +3326,15 @@ public final class ActivityThread {
             return false;
         }
         int changes = mResConfiguration.updateFrom(config);
-        DisplayMetrics dm = getDisplayMetricsLocked(true);
+        DisplayMetrics dm = getDisplayMetricsLocked(compat, true);
+
+        if (compat != null && (mResCompatibilityInfo == null ||
+                !mResCompatibilityInfo.equals(compat))) {
+            mResCompatibilityInfo = compat;
+            changes |= ActivityInfo.CONFIG_SCREEN_LAYOUT
+                    | ActivityInfo.CONFIG_SCREEN_SIZE
+                    | ActivityInfo.CONFIG_SMALLEST_SCREEN_SIZE;
+        }
 
         // set it for java, this also affects newly created Resources
         if (config.locale != null) {
@@ -3358,13 +3396,14 @@ public final class ActivityThread {
                 return;
             }
             mConfiguration.updateFrom(config);
-            if (compat != null) {
-                // Can't do this here, because it causes us to report the
-                // comatible config back to the am as the current config
-                // of the activity, and much unhappiness results.
-                //compat.applyToConfiguration(mConfiguration);
+            if (mCompatConfiguration == null) {
+                mCompatConfiguration = new Configuration();
+            }
+            mCompatConfiguration.setTo(mConfiguration);
+            if (mResCompatibilityInfo != null && !mResCompatibilityInfo.supportsScreen()) {
+                mResCompatibilityInfo.applyToConfiguration(mCompatConfiguration);
+                config = mCompatConfiguration;
             }
-
             callbacks = collectComponentCallbacksLocked(false, config);
         }
 
@@ -3385,7 +3424,7 @@ public final class ActivityThread {
         if (DEBUG_CONFIGURATION) Slog.v(TAG, "Handle activity config changed: "
                 + r.activityInfo.name);
         
-        performConfigurationChanged(r.activity, mConfiguration);
+        performConfigurationChanged(r.activity, mCompatConfiguration);
     }
 
     final void handleProfilerControl(boolean start, ProfilerControlData pcd) {
@@ -3480,6 +3519,7 @@ public final class ActivityThread {
     private final void handleBindApplication(AppBindData data) {
         mBoundApplication = data;
         mConfiguration = new Configuration(data.config);
+        mCompatConfiguration = new Configuration(data.config);
 
         // send up app name; do this *before* waiting for debugger
         Process.setArgV0(data.processName);
diff --git a/core/java/android/app/Application.java b/core/java/android/app/Application.java
index b9ac848..10cc9f8 100644
--- a/core/java/android/app/Application.java
+++ b/core/java/android/app/Application.java
@@ -37,6 +37,8 @@ import android.content.res.Configuration;
  * when first constructing the singleton.</p>
  */
 public class Application extends ContextWrapper implements ComponentCallbacks {
+    /** @hide */
+    public LoadedApk mLoadedApk;
     
     public Application() {
         super(null);
@@ -75,6 +77,6 @@ public class Application extends ContextWrapper implements ComponentCallbacks {
      */
     /* package */ final void attach(Context context) {
         attachBaseContext(context);
+        mLoadedApk = ContextImpl.getImpl(context).mPackageInfo;
     }
-
 }
diff --git a/core/java/android/app/ContextImpl.java b/core/java/android/app/ContextImpl.java
index 73170bb..20dc792 100644
--- a/core/java/android/app/ContextImpl.java
+++ b/core/java/android/app/ContextImpl.java
@@ -425,11 +425,19 @@ class ContextImpl extends Context {
 
         registerService(WINDOW_SERVICE, new ServiceFetcher() {
                 public Object getService(ContextImpl ctx) {
-                    CompatibilityInfo ci = ctx.mResources.getCompatibilityInfo();
-                    return WindowManagerImpl.getDefault(ci);
+                    return WindowManagerImpl.getDefault(ctx.mPackageInfo.mCompatibilityInfo);
                 }});
     }
 
+    static ContextImpl getImpl(Context context) {
+        Context nextContext;
+        while ((context instanceof ContextWrapper) &&
+                (nextContext=((ContextWrapper)context).getBaseContext()) != null) {
+            context = nextContext;
+        }
+        return (ContextImpl)context;
+    }
+
     // The system service cache for the system services that are
     // cached per-ContextImpl.  Package-scoped to avoid accessor
     // methods.
diff --git a/core/java/android/app/LoadedApk.java b/core/java/android/app/LoadedApk.java
index 6287d33..2549c84 100644
--- a/core/java/android/app/LoadedApk.java
+++ b/core/java/android/app/LoadedApk.java
@@ -38,6 +38,7 @@ import android.os.RemoteException;
 import android.os.StrictMode;
 import android.util.AndroidRuntimeException;
 import android.util.Slog;
+import android.view.CompatibilityInfoHolder;
 
 import java.io.File;
 import java.io.IOException;
@@ -64,7 +65,7 @@ final class ServiceConnectionLeaked extends AndroidRuntimeException {
  * Local state maintained about a currently loaded .apk.
  * @hide
  */
-final class LoadedApk {
+public final class LoadedApk {
 
     private final ActivityThread mActivityThread;
     private final ApplicationInfo mApplicationInfo;
@@ -78,10 +79,10 @@ final class LoadedApk {
     private final ClassLoader mBaseClassLoader;
     private final boolean mSecurityViolation;
     private final boolean mIncludeCode;
+    public final CompatibilityInfoHolder mCompatibilityInfo = new CompatibilityInfoHolder();
     Resources mResources;
     private ClassLoader mClassLoader;
     private Application mApplication;
-    CompatibilityInfo mCompatibilityInfo;
 
     private final HashMap<Context, HashMap<BroadcastReceiver, LoadedApk.ReceiverDispatcher>> mReceivers
         = new HashMap<Context, HashMap<BroadcastReceiver, LoadedApk.ReceiverDispatcher>>();
@@ -121,7 +122,7 @@ final class LoadedApk {
         mBaseClassLoader = baseLoader;
         mSecurityViolation = securityViolation;
         mIncludeCode = includeCode;
-        mCompatibilityInfo = compatInfo;
+        mCompatibilityInfo.set(compatInfo);
 
         if (mAppDir == null) {
             if (ActivityThread.mSystemContext == null) {
@@ -129,7 +130,7 @@ final class LoadedApk {
                     ContextImpl.createSystemContext(mainThread);
                 ActivityThread.mSystemContext.getResources().updateConfiguration(
                          mainThread.getConfiguration(),
-                         mainThread.getDisplayMetricsLocked(false),
+                         mainThread.getDisplayMetricsLocked(compatInfo, false),
                          compatInfo);
                 //Slog.i(TAG, "Created system resources "
                 //        + mSystemContext.getResources() + ": "
@@ -157,7 +158,7 @@ final class LoadedApk {
         mIncludeCode = true;
         mClassLoader = systemContext.getClassLoader();
         mResources = systemContext.getResources();
-        mCompatibilityInfo = compatInfo;
+        mCompatibilityInfo.set(compatInfo);
     }
 
     public String getPackageName() {
diff --git a/core/java/android/content/res/CompatibilityInfo.java b/core/java/android/content/res/CompatibilityInfo.java
index b686e54..acf2f2f 100644
--- a/core/java/android/content/res/CompatibilityInfo.java
+++ b/core/java/android/content/res/CompatibilityInfo.java
@@ -456,6 +456,9 @@ public class CompatibilityInfo implements Parcelable {
             inoutConfig.screenLayout =
                     (inoutConfig.screenLayout&~Configuration.SCREENLAYOUT_SIZE_MASK)
                     | Configuration.SCREENLAYOUT_SIZE_NORMAL;
+            inoutConfig.screenWidthDp = inoutConfig.compatScreenWidthDp;
+            inoutConfig.screenHeightDp = inoutConfig.compatScreenHeightDp;
+            inoutConfig.smallestScreenWidthDp = inoutConfig.compatSmallestScreenWidthDp;
         }
     }
 
diff --git a/core/java/android/content/res/Configuration.java b/core/java/android/content/res/Configuration.java
index 6409aac..e2c6483 100644
--- a/core/java/android/content/res/Configuration.java
+++ b/core/java/android/content/res/Configuration.java
@@ -269,6 +269,13 @@ public final class Configuration implements Parcelable, Comparable<Configuration
      */
     public int smallestScreenWidthDp;
 
+    /** @hide Hack to get this information from WM to app running in compat mode. */
+    public int compatScreenWidthDp;
+    /** @hide Hack to get this information from WM to app running in compat mode. */
+    public int compatScreenHeightDp;
+    /** @hide Hack to get this information from WM to app running in compat mode. */
+    public int compatSmallestScreenWidthDp;
+
     /**
      * @hide Internal book-keeping.
      */
@@ -309,6 +316,9 @@ public final class Configuration implements Parcelable, Comparable<Configuration
         screenWidthDp = o.screenWidthDp;
         screenHeightDp = o.screenHeightDp;
         smallestScreenWidthDp = o.smallestScreenWidthDp;
+        compatScreenWidthDp = o.compatScreenWidthDp;
+        compatScreenHeightDp = o.compatScreenHeightDp;
+        compatSmallestScreenWidthDp = o.compatSmallestScreenWidthDp;
         seq = o.seq;
     }
     
@@ -444,9 +454,9 @@ public final class Configuration implements Parcelable, Comparable<Configuration
         orientation = ORIENTATION_UNDEFINED;
         screenLayout = SCREENLAYOUT_SIZE_UNDEFINED;
         uiMode = UI_MODE_TYPE_UNDEFINED;
-        screenWidthDp = SCREEN_WIDTH_DP_UNDEFINED;
-        screenHeightDp = SCREEN_HEIGHT_DP_UNDEFINED;
-        smallestScreenWidthDp = SMALLEST_SCREEN_WIDTH_DP_UNDEFINED;
+        screenWidthDp = compatScreenWidthDp = SCREEN_WIDTH_DP_UNDEFINED;
+        screenHeightDp = compatScreenHeightDp = SCREEN_HEIGHT_DP_UNDEFINED;
+        smallestScreenWidthDp = compatSmallestScreenWidthDp = SMALLEST_SCREEN_WIDTH_DP_UNDEFINED;
         seq = 0;
     }
 
@@ -550,11 +560,18 @@ public final class Configuration implements Parcelable, Comparable<Configuration
             changed |= ActivityInfo.CONFIG_SCREEN_SIZE;
             screenHeightDp = delta.screenHeightDp;
         }
-        if (delta.smallestScreenWidthDp != SMALLEST_SCREEN_WIDTH_DP_UNDEFINED
-                && smallestScreenWidthDp != delta.smallestScreenWidthDp) {
-            changed |= ActivityInfo.CONFIG_SMALLEST_SCREEN_SIZE;
+        if (delta.smallestScreenWidthDp != SMALLEST_SCREEN_WIDTH_DP_UNDEFINED) {
             smallestScreenWidthDp = delta.smallestScreenWidthDp;
         }
+        if (delta.compatScreenWidthDp != SCREEN_WIDTH_DP_UNDEFINED) {
+            compatScreenWidthDp = delta.compatScreenWidthDp;
+        }
+        if (delta.compatScreenHeightDp != SCREEN_HEIGHT_DP_UNDEFINED) {
+            compatScreenHeightDp = delta.compatScreenHeightDp;
+        }
+        if (delta.compatSmallestScreenWidthDp != SMALLEST_SCREEN_WIDTH_DP_UNDEFINED) {
+            compatSmallestScreenWidthDp = delta.compatSmallestScreenWidthDp;
+        }
         
         if (delta.seq != 0) {
             seq = delta.seq;
@@ -739,6 +756,9 @@ public final class Configuration implements Parcelable, Comparable<Configuration
         dest.writeInt(screenWidthDp);
         dest.writeInt(screenHeightDp);
         dest.writeInt(smallestScreenWidthDp);
+        dest.writeInt(compatScreenWidthDp);
+        dest.writeInt(compatScreenHeightDp);
+        dest.writeInt(compatSmallestScreenWidthDp);
         dest.writeInt(seq);
     }
 
@@ -763,6 +783,9 @@ public final class Configuration implements Parcelable, Comparable<Configuration
         screenWidthDp = source.readInt();
         screenHeightDp = source.readInt();
         smallestScreenWidthDp = source.readInt();
+        compatScreenWidthDp = source.readInt();
+        compatScreenHeightDp = source.readInt();
+        compatSmallestScreenWidthDp = source.readInt();
         seq = source.readInt();
     }
     
diff --git a/core/java/android/content/res/Resources.java b/core/java/android/content/res/Resources.java
index 70bf524..bd8b1a4 100755
--- a/core/java/android/content/res/Resources.java
+++ b/core/java/android/content/res/Resources.java
@@ -1414,18 +1414,6 @@ public class Resources {
             if (compat != null) {
                 mCompatibilityInfo = compat;
             }
-            int configChanges = 0xfffffff;
-            if (config != null) {
-                mTmpConfig.setTo(config);
-                if (mCompatibilityInfo != null) {
-                    mCompatibilityInfo.applyToConfiguration(mTmpConfig);
-                }
-                configChanges = mConfiguration.updateFrom(mTmpConfig);
-                configChanges = ActivityInfo.activityInfoConfigToNative(configChanges);
-            }
-            if (mConfiguration.locale == null) {
-                mConfiguration.locale = Locale.getDefault();
-            }
             if (metrics != null) {
                 mMetrics.setTo(metrics);
                 // NOTE: We should re-arrange this code to create a Display
@@ -1441,7 +1429,25 @@ public class Resources {
                     mCompatibilityInfo.applyToDisplayMetrics(mMetrics);
                 }
             }
+            if (mCompatibilityInfo != null) {
+                mCompatibilityInfo.applyToDisplayMetrics(mMetrics);
+            }
             mMetrics.scaledDensity = mMetrics.density * mConfiguration.fontScale;
+            int configChanges = 0xfffffff;
+            if (config != null) {
+                mTmpConfig.setTo(config);
+                if (mCompatibilityInfo != null) {
+                    mCompatibilityInfo.applyToConfiguration(mTmpConfig);
+                }
+                if (mTmpConfig.locale == null) {
+                    mTmpConfig.locale = Locale.getDefault();
+                }
+                configChanges = mConfiguration.updateFrom(mTmpConfig);
+                configChanges = ActivityInfo.activityInfoConfigToNative(configChanges);
+            }
+            if (mConfiguration.locale == null) {
+                mConfiguration.locale = Locale.getDefault();
+            }
 
             String locale = null;
             if (mConfiguration.locale != null) {
@@ -1476,7 +1482,7 @@ public class Resources {
                     mConfiguration.screenLayout, mConfiguration.uiMode,
                     Build.VERSION.RESOURCES_SDK_INT);
 
-            if (false) {
+            if (DEBUG_CONFIG) {
                 Slog.i(TAG, "**** Updating config of " + this + ": final config is " + mConfiguration
                         + " final compat is " + mCompatibilityInfo);
             }
@@ -1558,6 +1564,8 @@ public class Resources {
      * @return The resource's current display metrics. 
      */
     public DisplayMetrics getDisplayMetrics() {
+        if (DEBUG_CONFIG) Slog.v(TAG, "Returning DisplayMetrics: " + mMetrics.widthPixels
+                + "x" + mMetrics.heightPixels + " " + mMetrics.density);
         return mMetrics;
     }
 
diff --git a/core/java/android/text/TextLine.java b/core/java/android/text/TextLine.java
index 90279d1..155870a 100644
--- a/core/java/android/text/TextLine.java
+++ b/core/java/android/text/TextLine.java
@@ -75,7 +75,6 @@ class TextLine {
             }
         }
         tl = new TextLine();
-        Log.v("TLINE", "new: " + tl);
         return tl;
     }
 
diff --git a/core/java/android/view/CompatibilityInfoHolder.java b/core/java/android/view/CompatibilityInfoHolder.java
new file mode 100644
index 0000000..fc8d684
--- /dev/null
+++ b/core/java/android/view/CompatibilityInfoHolder.java
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.view;
+
+import android.content.res.CompatibilityInfo;
+
+/** @hide */
+public class CompatibilityInfoHolder {
+    private volatile CompatibilityInfo mCompatInfo = CompatibilityInfo.DEFAULT_COMPATIBILITY_INFO;
+
+    public void set(CompatibilityInfo compatInfo) {
+        if (compatInfo != null && (compatInfo.isScalingRequired()
+                || !compatInfo.supportsScreen())) {
+            mCompatInfo = compatInfo;
+        } else {
+            mCompatInfo = CompatibilityInfo.DEFAULT_COMPATIBILITY_INFO;
+        }
+    }
+
+    public CompatibilityInfo get() {
+        return mCompatInfo;
+    }
+
+    public CompatibilityInfo getIfNeeded() {
+        CompatibilityInfo ci = mCompatInfo;
+        if (ci == null || ci  == CompatibilityInfo.DEFAULT_COMPATIBILITY_INFO) {
+            return null;
+        }
+        return ci;
+    }
+}
diff --git a/core/java/android/view/Display.java b/core/java/android/view/Display.java
index 8032546..3fa8dfd 100644
--- a/core/java/android/view/Display.java
+++ b/core/java/android/view/Display.java
@@ -26,6 +26,9 @@ import android.util.DisplayMetrics;
 import android.util.Slog;
 
 public class Display {
+    static final String TAG = "Display";
+    static final boolean DEBUG_COMPAT = false;
+
     /**
      * Specify the default Display
      */
@@ -38,7 +41,7 @@ public class Display {
      * Display gives you access to some information about a particular display
      * connected to the device.
      */
-    Display(int display, CompatibilityInfo compatInfo) {
+    Display(int display, CompatibilityInfoHolder compatInfo) {
         // initalize the statics when this class is first instansiated. This is
         // done here instead of in the static block because Zygote
         synchronized (sStaticInit) {
@@ -47,14 +50,19 @@ public class Display {
                 sInitialized = true;
             }
         }
+        mCompatibilityInfo = compatInfo != null ? compatInfo : new CompatibilityInfoHolder();
+        mDisplay = display;
+        init(display);
+    }
+
+    /** @hide */
+    public static void setCompatibilityInfo(CompatibilityInfo compatInfo) {
         if (compatInfo != null && (compatInfo.isScalingRequired()
                 || !compatInfo.supportsScreen())) {
-            mCompatibilityInfo = compatInfo;
+            sCompatibilityInfo = compatInfo;
         } else {
-            mCompatibilityInfo = null;
+            sCompatibilityInfo = null;
         }
-        mDisplay = display;
-        init(display);
     }
     
     /**
@@ -96,12 +104,13 @@ public class Display {
             IWindowManager wm = getWindowManager();
             if (wm != null) {
                 wm.getDisplaySize(outSize);
-                if (doCompat && mCompatibilityInfo != null) {
+                CompatibilityInfo ci;
+                if (doCompat && (ci=mCompatibilityInfo.getIfNeeded()) != null) {
                     synchronized (mTmpMetrics) {
                         mTmpMetrics.unscaledWidthPixels = outSize.x;
                         mTmpMetrics.unscaledHeightPixels = outSize.y;
                         mTmpMetrics.density = mDensity;
-                        mCompatibilityInfo.applyToDisplayMetrics(mTmpMetrics);
+                        ci.applyToDisplayMetrics(mTmpMetrics);
                         outSize.x = mTmpMetrics.widthPixels;
                         outSize.y = mTmpMetrics.heightPixels;
                     }
@@ -111,6 +120,7 @@ public class Display {
                 // system process before the window manager is up.
                 outSize.y = getRealHeight();
             }
+            if (DEBUG_COMPAT && doCompat) Slog.v(TAG, "Returning display size: " + outSize);
         } catch (RemoteException e) {
             Slog.w("Display", "Unable to get display size", e);
         }
@@ -236,9 +246,13 @@ public class Display {
         }
         getNonSizeMetrics(outMetrics);
 
-        if (mCompatibilityInfo != null) {
-            mCompatibilityInfo.applyToDisplayMetrics(outMetrics);
+        CompatibilityInfo ci = mCompatibilityInfo.getIfNeeded();
+        if (ci != null) {
+            ci.applyToDisplayMetrics(outMetrics);
         }
+
+        if (DEBUG_COMPAT) Slog.v(TAG, "Returning DisplayMetrics: " + outMetrics.widthPixels
+                + "x" + outMetrics.heightPixels + " " + outMetrics.density);
     }
 
     /**
@@ -282,7 +296,7 @@ public class Display {
     
     private native void init(int display);
 
-    private final CompatibilityInfo mCompatibilityInfo;
+    private final CompatibilityInfoHolder mCompatibilityInfo;
     private final int   mDisplay;
     // Following fields are initialized from native code
     private int         mPixelFormat;
@@ -299,11 +313,13 @@ public class Display {
     private static boolean sInitialized = false;
     private static IWindowManager sWindowManager;
 
+    private static volatile CompatibilityInfo sCompatibilityInfo;
+
     /**
      * Returns a display object which uses the metric's width/height instead.
      * @hide
      */
-    public static Display createCompatibleDisplay(int displayId, CompatibilityInfo compat) {
+    public static Display createCompatibleDisplay(int displayId, CompatibilityInfoHolder compat) {
         return new Display(displayId, compat);
     }
 }
diff --git a/core/java/android/view/ViewRoot.java b/core/java/android/view/ViewRoot.java
index 2098955..cdb0339 100644
--- a/core/java/android/view/ViewRoot.java
+++ b/core/java/android/view/ViewRoot.java
@@ -159,6 +159,8 @@ public final class ViewRoot extends Handler implements ViewParent,
     // so the window should no longer be active.
     boolean mStopped = false;
     
+    boolean mLastInCompatMode = false;
+
     SurfaceHolder.Callback2 mSurfaceHolderCallback;
     BaseSurfaceHolder mSurfaceHolder;
     boolean mIsCreating;
@@ -204,6 +206,8 @@ public final class ViewRoot extends Handler implements ViewParent,
     boolean mAdded;
     boolean mAddedTouchMode;
 
+    CompatibilityInfoHolder mCompatibilityInfo;
+
     /*package*/ int mAddNesting;
 
     // These are accessed by multiple threads.
@@ -369,8 +373,7 @@ public final class ViewRoot extends Handler implements ViewParent,
                     enableHardwareAcceleration(attrs);
                 }
 
-                Resources resources = mView.getContext().getResources();
-                CompatibilityInfo compatibilityInfo = resources.getCompatibilityInfo();
+                CompatibilityInfo compatibilityInfo = mCompatibilityInfo.get();
                 mTranslator = compatibilityInfo.getTranslator();
 
                 if (mTranslator != null) {
@@ -387,6 +390,7 @@ public final class ViewRoot extends Handler implements ViewParent,
 
                 if (!compatibilityInfo.supportsScreen()) {
                     attrs.flags |= WindowManager.LayoutParams.FLAG_COMPATIBLE_WINDOW;
+                    mLastInCompatMode = true;
                 }
 
                 mSoftInputMode = attrs.softInputMode;
@@ -719,6 +723,19 @@ public final class ViewRoot extends Handler implements ViewParent,
             surfaceChanged = true;
             params = lp;
         }
+        CompatibilityInfo compatibilityInfo = mCompatibilityInfo.get();
+        if (compatibilityInfo.supportsScreen() == mLastInCompatMode) {
+            params = lp;
+            fullRedrawNeeded = true;
+            mLayoutRequested = true;
+            if (mLastInCompatMode) {
+                params.flags &= ~WindowManager.LayoutParams.FLAG_COMPATIBLE_WINDOW;
+                mLastInCompatMode = false;
+            } else {
+                params.flags |= WindowManager.LayoutParams.FLAG_COMPATIBLE_WINDOW;
+                mLastInCompatMode = true;
+            }
+        }
         Rect frame = mWinFrame;
         if (mFirst) {
             fullRedrawNeeded = true;
@@ -1934,6 +1951,13 @@ public final class ViewRoot extends Handler implements ViewParent,
                 "Applying new config to window "
                 + mWindowAttributes.getTitle()
                 + ": " + config);
+
+        CompatibilityInfo ci = mCompatibilityInfo.getIfNeeded();
+        if (ci != null) {
+            config = new Configuration(config);
+            ci.applyToConfiguration(config);
+        }
+
         synchronized (sConfigCallbacks) {
             for (int i=sConfigCallbacks.size()-1; i>=0; i--) {
                 sConfigCallbacks.get(i).onConfigurationChanged(config);
@@ -1995,6 +2019,7 @@ public final class ViewRoot extends Handler implements ViewParent,
     public final static int DISPATCH_DRAG_LOCATION_EVENT = 1016;
     public final static int DISPATCH_SYSTEM_UI_VISIBILITY = 1017;
     public final static int DISPATCH_GENERIC_MOTION = 1018;
+    public final static int UPDATE_CONFIGURATION = 1019;
 
     @Override
     public void handleMessage(Message msg) {
@@ -2178,6 +2203,13 @@ public final class ViewRoot extends Handler implements ViewParent,
         case DISPATCH_SYSTEM_UI_VISIBILITY: {
             handleDispatchSystemUiVisibilityChanged(msg.arg1);
         } break;
+        case UPDATE_CONFIGURATION: {
+            Configuration config = (Configuration)msg.obj;
+            if (config.isOtherSeqNewer(mLastConfiguration)) {
+                config = mLastConfiguration;
+            }
+            updateConfiguration(config, false);
+        } break;
         }
     }
     
@@ -3205,6 +3237,11 @@ public final class ViewRoot extends Handler implements ViewParent,
         }
     }
 
+    public void requestUpdateConfiguration(Configuration config) {
+        Message msg = obtainMessage(UPDATE_CONFIGURATION, config);
+        sendMessage(msg);
+    }
+
     private void destroyHardwareRenderer() {
         if (mAttachInfo.mHardwareRenderer != null) {
             mAttachInfo.mHardwareRenderer.destroy(true);
diff --git a/core/java/android/view/Window.java b/core/java/android/view/Window.java
index 5236a9e..e07085c 100644
--- a/core/java/android/view/Window.java
+++ b/core/java/android/view/Window.java
@@ -16,6 +16,7 @@
 
 package android.view;
 
+import android.app.Application;
 import android.content.Context;
 import android.content.res.CompatibilityInfo;
 import android.content.res.Configuration;
@@ -25,6 +26,7 @@ import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.IBinder;
+import android.util.Slog;
 import android.view.accessibility.AccessibilityEvent;
 
 /**
@@ -463,11 +465,16 @@ public abstract class Window {
         mWindowManager = new LocalWindowManager(wm, hardwareAccelerated);
     }
 
+    static CompatibilityInfoHolder getCompatInfo(Context context) {
+        Application app = (Application)context.getApplicationContext();
+        return app != null ? app.mLoadedApk.mCompatibilityInfo : new CompatibilityInfoHolder();
+    }
+
     private class LocalWindowManager extends WindowManagerImpl.CompatModeWrapper {
         private final boolean mHardwareAccelerated;
 
         LocalWindowManager(WindowManager wm, boolean hardwareAccelerated) {
-            super(wm, mContext.getResources().getCompatibilityInfo());
+            super(wm, getCompatInfo(mContext));
             mHardwareAccelerated = hardwareAccelerated;
         }
 
diff --git a/core/java/android/view/WindowManagerImpl.java b/core/java/android/view/WindowManagerImpl.java
index 9cae75c..a853c15 100644
--- a/core/java/android/view/WindowManagerImpl.java
+++ b/core/java/android/view/WindowManagerImpl.java
@@ -19,11 +19,13 @@ package android.view;
 import java.util.HashMap;
 
 import android.content.res.CompatibilityInfo;
+import android.content.res.Configuration;
 import android.graphics.PixelFormat;
 import android.os.IBinder;
 import android.util.AndroidRuntimeException;
 import android.util.Config;
 import android.util.Log;
+import android.util.Slog;
 import android.view.WindowManager;
 import android.view.inputmethod.InputMethodManager;
 
@@ -88,29 +90,32 @@ public class WindowManagerImpl implements WindowManager {
             = new HashMap<CompatibilityInfo, WindowManager>();
 
     static class CompatModeWrapper implements WindowManager {
-        private final WindowManager mWindowManager;
+        private final WindowManagerImpl mWindowManager;
         private final Display mDefaultDisplay;
+        private final CompatibilityInfoHolder mCompatibilityInfo;
 
-        CompatModeWrapper(WindowManager wm, CompatibilityInfo ci) {
-            mWindowManager = wm;
+        CompatModeWrapper(WindowManager wm, CompatibilityInfoHolder ci) {
+            mWindowManager = wm instanceof CompatModeWrapper
+                    ? ((CompatModeWrapper)wm).mWindowManager : (WindowManagerImpl)wm;
 
             // Use the original display if there is no compatibility mode
             // to apply, or the underlying window manager is already a
             // compatibility mode wrapper.  (We assume that if it is a
             // wrapper, it is applying the same compatibility mode.)
-            if (ci == null || wm instanceof CompatModeWrapper
-                    || (!ci.isScalingRequired() && ci.supportsScreen())) {
+            if (ci == null) {
                 mDefaultDisplay = mWindowManager.getDefaultDisplay();
             } else {
                 //mDefaultDisplay = mWindowManager.getDefaultDisplay();
                 mDefaultDisplay = Display.createCompatibleDisplay(
                         mWindowManager.getDefaultDisplay().getDisplayId(), ci);
             }
+
+            mCompatibilityInfo = ci;
         }
 
         @Override
         public void addView(View view, android.view.ViewGroup.LayoutParams params) {
-            mWindowManager.addView(view, params);
+            mWindowManager.addView(view, params, mCompatibilityInfo);
         }
 
         @Override
@@ -146,8 +151,9 @@ public class WindowManagerImpl implements WindowManager {
     }
 
     public static WindowManager getDefault(CompatibilityInfo compatInfo) {
-        if (compatInfo == null || (!compatInfo.isScalingRequired()
-                && compatInfo.supportsScreen())) {
+        CompatibilityInfoHolder cih = new CompatibilityInfoHolder();
+        cih.set(compatInfo);
+        if (cih.getIfNeeded() == null) {
             return sWindowManager;
         }
 
@@ -159,35 +165,40 @@ public class WindowManagerImpl implements WindowManager {
             // having to make wrappers.
             WindowManager wm = sCompatWindowManagers.get(compatInfo);
             if (wm == null) {
-                wm = new CompatModeWrapper(sWindowManager, compatInfo);
+                wm = new CompatModeWrapper(sWindowManager, cih);
                 sCompatWindowManagers.put(compatInfo, wm);
             }
             return wm;
         }
     }
+
+    public static WindowManager getDefault(CompatibilityInfoHolder compatInfo) {
+        return new CompatModeWrapper(sWindowManager, compatInfo);
+    }
     
     public boolean isHardwareAccelerated() {
         return false;
     }
     
-    public void addView(View view)
-    {
+    public void addView(View view) {
         addView(view, new WindowManager.LayoutParams(
             WindowManager.LayoutParams.TYPE_APPLICATION, 0, PixelFormat.OPAQUE));
     }
 
-    public void addView(View view, ViewGroup.LayoutParams params)
-    {
-        addView(view, params, false);
+    public void addView(View view, ViewGroup.LayoutParams params) {
+        addView(view, params, null, false);
     }
     
-    public void addViewNesting(View view, ViewGroup.LayoutParams params)
-    {
-        addView(view, params, false);
+    public void addView(View view, ViewGroup.LayoutParams params, CompatibilityInfoHolder cih) {
+        addView(view, params, cih, false);
     }
     
-    private void addView(View view, ViewGroup.LayoutParams params, boolean nest)
-    {
+    public void addViewNesting(View view, ViewGroup.LayoutParams params) {
+        addView(view, params, null, false);
+    }
+
+    private void addView(View view, ViewGroup.LayoutParams params,
+            CompatibilityInfoHolder cih, boolean nest) {
         if (Config.LOGV) Log.v("WindowManager", "addView view=" + view);
 
         if (!(params instanceof WindowManager.LayoutParams)) {
@@ -237,6 +248,11 @@ public class WindowManagerImpl implements WindowManager {
             
             root = new ViewRoot(view.getContext());
             root.mAddNesting = 1;
+            if (cih == null) {
+                root.mCompatibilityInfo = new CompatibilityInfoHolder();
+            } else {
+                root.mCompatibilityInfo = cih;
+            }
 
             view.setLayoutParams(wparams);
             
@@ -402,6 +418,17 @@ public class WindowManagerImpl implements WindowManager {
         }
     }
     
+    public void reportNewConfiguration(Configuration config) {
+        synchronized (this) {
+            int count = mViews.length;
+            config = new Configuration(config);
+            for (int i=0; i<count; i++) {
+                ViewRoot root = mRoots[i];
+                root.requestUpdateConfiguration(config);
+            }
+        }
+    }
+
     public WindowManager.LayoutParams getRootViewLayoutParameter(View view) {
         ViewParent vp = view.getParent();
         while (vp != null && !(vp instanceof ViewRoot)) {