Support activities in the same process having different resources.

Activities can be of various sizes in a multi-window environment.
This change allows them to have override configurations that allows
different resources to the loaded if needed.

Bug: 19002213
Change-Id: Ib2c7be0b427f5ce05e7a362bcdd496ddbc9164f0

15 files changed, 238 insertions, 141 deletions

diff --git a/core/java/android/app/Activity.java b/core/java/android/app/Activity.java
index 23b05c4..a597d5e 100644
--- a/core/java/android/app/Activity.java
+++ b/core/java/android/app/Activity.java
@@ -4607,7 +4607,7 @@ public class Activity extends ContextThemeWrapper
         if (Looper.myLooper() != mMainThread.getLooper()) {
             throw new IllegalStateException("Must be called from main thread");
         }
-        mMainThread.requestRelaunchActivity(mToken, null, null, 0, false, null, false);
+        mMainThread.requestRelaunchActivity(mToken, null, null, 0, false, null, null, false);
     }
 
     /**
diff --git a/core/java/android/app/ActivityThread.java b/core/java/android/app/ActivityThread.java
index ea37b89..de3c95c 100644
--- a/core/java/android/app/ActivityThread.java
+++ b/core/java/android/app/ActivityThread.java
@@ -293,6 +293,7 @@ public final class ActivityThread {
         boolean hideForNow;
         Configuration newConfig;
         Configuration createdConfig;
+        Configuration overrideConfig;
         ActivityClientRecord nextIdle;
 
         ProfilerInfo profilerInfo;
@@ -615,12 +616,13 @@ public final class ActivityThread {
 
         // we use token to identify this activity without having to send the
         // activity itself back to the activity manager. (matters more with ipc)
+        @Override
         public final void scheduleLaunchActivity(Intent intent, IBinder token, int ident,
-                ActivityInfo info, Configuration curConfig, CompatibilityInfo compatInfo,
-                String referrer, IVoiceInteractor voiceInteractor, int procState, Bundle state,
-                PersistableBundle persistentState, List<ResultInfo> pendingResults,
-                List<ReferrerIntent> pendingNewIntents, boolean notResumed, boolean isForward,
-                ProfilerInfo profilerInfo) {
+                ActivityInfo info, Configuration curConfig, Configuration overrideConfig,
+                CompatibilityInfo compatInfo, String referrer, IVoiceInteractor voiceInteractor,
+                int procState, Bundle state, PersistableBundle persistentState,
+                List<ResultInfo> pendingResults, List<ReferrerIntent> pendingNewIntents,
+                boolean notResumed, boolean isForward, ProfilerInfo profilerInfo) {
 
             updateProcessState(procState, false);
 
@@ -644,16 +646,19 @@ public final class ActivityThread {
 
             r.profilerInfo = profilerInfo;
 
+            r.overrideConfig = overrideConfig;
             updatePendingConfiguration(curConfig);
 
             sendMessage(H.LAUNCH_ACTIVITY, r);
         }
 
+        @Override
         public final void scheduleRelaunchActivity(IBinder token,
                 List<ResultInfo> pendingResults, List<ReferrerIntent> pendingNewIntents,
-                int configChanges, boolean notResumed, Configuration config) {
+                int configChanges, boolean notResumed, Configuration config,
+                Configuration overrideConfig) {
             requestRelaunchActivity(token, pendingResults, pendingNewIntents,
-                    configChanges, notResumed, config, true);
+                    configChanges, notResumed, config, overrideConfig, true);
         }
 
         public final void scheduleNewIntent(List<ReferrerIntent> intents, IBinder token) {
@@ -887,6 +892,7 @@ public final class ActivityThread {
             sendMessage(H.LOW_MEMORY, null);
         }
 
+        @Override
         public void scheduleActivityConfigurationChanged(IBinder token) {
             sendMessage(H.ACTIVITY_CONFIGURATION_CHANGED, token);
         }
@@ -1668,7 +1674,7 @@ public final class ActivityThread {
             String[] libDirs, int displayId, Configuration overrideConfiguration,
             LoadedApk pkgInfo) {
         return mResourcesManager.getTopLevelResources(resDir, splitResDirs, overlayDirs, libDirs,
-                displayId, overrideConfiguration, pkgInfo.getCompatibilityInfo(), null);
+                displayId, overrideConfiguration, pkgInfo.getCompatibilityInfo());
     }
 
     final Handler getHandler() {
@@ -2353,7 +2359,8 @@ public final class ActivityThread {
 
     private Context createBaseContextForActivity(ActivityClientRecord r,
             final Activity activity) {
-        ContextImpl appContext = ContextImpl.createActivityContext(this, r.packageInfo, r.token);
+        ContextImpl appContext =
+                ContextImpl.createActivityContext(this, r.packageInfo, r.overrideConfig);
         appContext.setOuterContext(activity);
         Context baseContext = appContext;
 
@@ -3561,7 +3568,7 @@ public final class ActivityThread {
 
             // request all activities to relaunch for the changes to take place
             for (Map.Entry<IBinder, ActivityClientRecord> entry : mActivities.entrySet()) {
-                requestRelaunchActivity(entry.getKey(), null, null, 0, false, null, false);
+                requestRelaunchActivity(entry.getKey(), null, null, 0, false, null, null, false);
             }
         }
     }
@@ -3805,7 +3812,7 @@ public final class ActivityThread {
     public final void requestRelaunchActivity(IBinder token,
             List<ResultInfo> pendingResults, List<ReferrerIntent> pendingNewIntents,
             int configChanges, boolean notResumed, Configuration config,
-            boolean fromServer) {
+            Configuration overrideConfig, boolean fromServer) {
         ActivityClientRecord target = null;
 
         synchronized (mResourcesManager) {
@@ -3854,6 +3861,9 @@ public final class ActivityThread {
             if (config != null) {
                 target.createdConfig = config;
             }
+            if (overrideConfig != null) {
+                target.overrideConfig = overrideConfig;
+            }
             target.pendingConfigChanges |= configChanges;
         }
     }
@@ -3966,6 +3976,7 @@ public final class ActivityThread {
             }
         }
         r.startsNotResumed = tmp.startsNotResumed;
+        r.overrideConfig = tmp.overrideConfig;
 
         handleLaunchActivity(r, currentIntent);
     }
diff --git a/core/java/android/app/ApplicationThreadNative.java b/core/java/android/app/ApplicationThreadNative.java
index eb3ddb2..349b66d 100644
--- a/core/java/android/app/ApplicationThreadNative.java
+++ b/core/java/android/app/ApplicationThreadNative.java
@@ -140,6 +140,10 @@ public abstract class ApplicationThreadNative extends Binder
             int ident = data.readInt();
             ActivityInfo info = ActivityInfo.CREATOR.createFromParcel(data);
             Configuration curConfig = Configuration.CREATOR.createFromParcel(data);
+            Configuration overrideConfig = null;
+            if (data.readInt() != 0) {
+                overrideConfig = Configuration.CREATOR.createFromParcel(data);
+            }
             CompatibilityInfo compatInfo = CompatibilityInfo.CREATOR.createFromParcel(data);
             String referrer = data.readString();
             IVoiceInteractor voiceInteractor = IVoiceInteractor.Stub.asInterface(
@@ -153,8 +157,8 @@ public abstract class ApplicationThreadNative extends Binder
             boolean isForward = data.readInt() != 0;
             ProfilerInfo profilerInfo = data.readInt() != 0
                     ? ProfilerInfo.CREATOR.createFromParcel(data) : null;
-            scheduleLaunchActivity(intent, b, ident, info, curConfig, compatInfo, referrer,
-                    voiceInteractor, procState, state, persistentState, ri, pi,
+            scheduleLaunchActivity(intent, b, ident, info, curConfig, overrideConfig, compatInfo,
+                    referrer, voiceInteractor, procState, state, persistentState, ri, pi,
                     notResumed, isForward, profilerInfo);
             return true;
         }
@@ -167,14 +171,15 @@ public abstract class ApplicationThreadNative extends Binder
             List<ReferrerIntent> pi = data.createTypedArrayList(ReferrerIntent.CREATOR);
             int configChanges = data.readInt();
             boolean notResumed = data.readInt() != 0;
-            Configuration config = null;
+            Configuration config = Configuration.CREATOR.createFromParcel(data);
+            Configuration overrideConfig = null;
             if (data.readInt() != 0) {
-                config = Configuration.CREATOR.createFromParcel(data);
+                overrideConfig = Configuration.CREATOR.createFromParcel(data);
             }
-            scheduleRelaunchActivity(b, ri, pi, configChanges, notResumed, config);
+            scheduleRelaunchActivity(b, ri, pi, configChanges, notResumed, config, overrideConfig);
             return true;
         }
-        
+
         case SCHEDULE_NEW_INTENT_TRANSACTION:
         {
             data.enforceInterface(IApplicationThread.descriptor);
@@ -775,11 +780,11 @@ class ApplicationThreadProxy implements IApplicationThread {
     }
 
     public final void scheduleLaunchActivity(Intent intent, IBinder token, int ident,
-            ActivityInfo info, Configuration curConfig, CompatibilityInfo compatInfo,
-            String referrer, IVoiceInteractor voiceInteractor, int procState, Bundle state,
-            PersistableBundle persistentState, List<ResultInfo> pendingResults,
-            List<ReferrerIntent> pendingNewIntents, boolean notResumed, boolean isForward,
-            ProfilerInfo profilerInfo) throws RemoteException {
+            ActivityInfo info, Configuration curConfig, Configuration overrideConfig,
+            CompatibilityInfo compatInfo, String referrer, IVoiceInteractor voiceInteractor,
+            int procState, Bundle state, PersistableBundle persistentState,
+            List<ResultInfo> pendingResults, List<ReferrerIntent> pendingNewIntents,
+            boolean notResumed, boolean isForward, ProfilerInfo profilerInfo) throws RemoteException {
         Parcel data = Parcel.obtain();
         data.writeInterfaceToken(IApplicationThread.descriptor);
         intent.writeToParcel(data, 0);
@@ -787,6 +792,12 @@ class ApplicationThreadProxy implements IApplicationThread {
         data.writeInt(ident);
         info.writeToParcel(data, 0);
         curConfig.writeToParcel(data, 0);
+        if (overrideConfig != null) {
+            data.writeInt(1);
+            overrideConfig.writeToParcel(data, 0);
+        } else {
+            data.writeInt(0);
+        }
         compatInfo.writeToParcel(data, 0);
         data.writeString(referrer);
         data.writeStrongBinder(voiceInteractor != null ? voiceInteractor.asBinder() : null);
@@ -810,8 +821,8 @@ class ApplicationThreadProxy implements IApplicationThread {
 
     public final void scheduleRelaunchActivity(IBinder token,
             List<ResultInfo> pendingResults, List<ReferrerIntent> pendingNewIntents,
-            int configChanges, boolean notResumed, Configuration config)
-            throws RemoteException {
+            int configChanges, boolean notResumed, Configuration config,
+            Configuration overrideConfig) throws RemoteException {
         Parcel data = Parcel.obtain();
         data.writeInterfaceToken(IApplicationThread.descriptor);
         data.writeStrongBinder(token);
@@ -819,9 +830,10 @@ class ApplicationThreadProxy implements IApplicationThread {
         data.writeTypedList(pendingNewIntents);
         data.writeInt(configChanges);
         data.writeInt(notResumed ? 1 : 0);
-        if (config != null) {
+        config.writeToParcel(data, 0);
+        if (overrideConfig != null) {
             data.writeInt(1);
-            config.writeToParcel(data, 0);
+            overrideConfig.writeToParcel(data, 0);
         } else {
             data.writeInt(0);
         }
@@ -1112,8 +1124,7 @@ class ApplicationThreadProxy implements IApplicationThread {
         data.recycle();
     }
 
-    public final void scheduleActivityConfigurationChanged(
-            IBinder token) throws RemoteException {
+    public final void scheduleActivityConfigurationChanged(IBinder token) throws RemoteException {
         Parcel data = Parcel.obtain();
         data.writeInterfaceToken(IApplicationThread.descriptor);
         data.writeStrongBinder(token);
diff --git a/core/java/android/app/ContextImpl.java b/core/java/android/app/ContextImpl.java
index e9df8c6..39caf0b 100644
--- a/core/java/android/app/ContextImpl.java
+++ b/core/java/android/app/ContextImpl.java
@@ -2264,11 +2264,10 @@ class ContextImpl extends Context {
     }
 
     static ContextImpl createActivityContext(ActivityThread mainThread,
-            LoadedApk packageInfo, IBinder activityToken) {
+            LoadedApk packageInfo, Configuration overrideConfiguration) {
         if (packageInfo == null) throw new IllegalArgumentException("packageInfo");
-        if (activityToken == null) throw new IllegalArgumentException("activityInfo");
-        return new ContextImpl(null, mainThread,
-                packageInfo, activityToken, null, false, null, null);
+        return new ContextImpl(null, mainThread, packageInfo, null, null, false, null,
+                overrideConfiguration);
     }
 
     private ContextImpl(ContextImpl container, ActivityThread mainThread,
@@ -2303,15 +2302,14 @@ class ContextImpl extends Context {
 
         Resources resources = packageInfo.getResources(mainThread);
         if (resources != null) {
-            if (activityToken != null
-                    || displayId != Display.DEFAULT_DISPLAY
+            if (displayId != Display.DEFAULT_DISPLAY
                     || overrideConfiguration != null
                     || (compatInfo != null && compatInfo.applicationScale
                             != resources.getCompatibilityInfo().applicationScale)) {
                 resources = mResourcesManager.getTopLevelResources(packageInfo.getResDir(),
                         packageInfo.getSplitResDirs(), packageInfo.getOverlayDirs(),
                         packageInfo.getApplicationInfo().sharedLibraryFiles, displayId,
-                        overrideConfiguration, compatInfo, activityToken);
+                        overrideConfiguration, compatInfo);
             }
         }
         mResources = resources;
diff --git a/core/java/android/app/IApplicationThread.java b/core/java/android/app/IApplicationThread.java
index 8bf8cd7..f2c912e 100644
--- a/core/java/android/app/IApplicationThread.java
+++ b/core/java/android/app/IApplicationThread.java
@@ -33,7 +33,6 @@ import android.os.PersistableBundle;
 import android.os.RemoteException;
 import android.os.IBinder;
 import android.os.IInterface;
-import android.service.voice.IVoiceInteractionSession;
 import com.android.internal.app.IVoiceInteractor;
 import com.android.internal.content.ReferrerIntent;
 
@@ -59,14 +58,14 @@ public interface IApplicationThread extends IInterface {
             throws RemoteException;
     void scheduleSendResult(IBinder token, List<ResultInfo> results) throws RemoteException;
     void scheduleLaunchActivity(Intent intent, IBinder token, int ident,
-            ActivityInfo info, Configuration curConfig, CompatibilityInfo compatInfo,
-            String referrer, IVoiceInteractor voiceInteractor, int procState, Bundle state,
-            PersistableBundle persistentState, List<ResultInfo> pendingResults,
-            List<ReferrerIntent> pendingNewIntents, boolean notResumed, boolean isForward,
-            ProfilerInfo profilerInfo) throws RemoteException;
+            ActivityInfo info, Configuration curConfig, Configuration overrideConfig,
+            CompatibilityInfo compatInfo, String referrer, IVoiceInteractor voiceInteractor,
+            int procState, Bundle state, PersistableBundle persistentState,
+            List<ResultInfo> pendingResults, List<ReferrerIntent> pendingNewIntents,
+            boolean notResumed, boolean isForward, ProfilerInfo profilerInfo) throws RemoteException;
     void scheduleRelaunchActivity(IBinder token, List<ResultInfo> pendingResults,
-            List<ReferrerIntent> pendingNewIntents, int configChanges,
-            boolean notResumed, Configuration config) throws RemoteException;
+            List<ReferrerIntent> pendingNewIntents, int configChanges, boolean notResumed,
+            Configuration config, Configuration overrideConfig) throws RemoteException;
     void scheduleNewIntent(List<ReferrerIntent> intent, IBinder token) throws RemoteException;
     void scheduleDestroyActivity(IBinder token, boolean finished,
             int configChanges) throws RemoteException;
diff --git a/core/java/android/app/ResourcesManager.java b/core/java/android/app/ResourcesManager.java
index 1691d8e..fac40b2 100644
--- a/core/java/android/app/ResourcesManager.java
+++ b/core/java/android/app/ResourcesManager.java
@@ -25,7 +25,6 @@ import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.content.res.ResourcesKey;
 import android.hardware.display.DisplayManagerGlobal;
-import android.os.IBinder;
 import android.util.ArrayMap;
 import android.util.DisplayMetrics;
 import android.util.Slog;
@@ -38,8 +37,7 @@ import java.util.Locale;
 /** @hide */
 public class ResourcesManager {
     static final String TAG = "ResourcesManager";
-    static final boolean DEBUG_CACHE = false;
-    static final boolean DEBUG_STATS = true;
+    private static final boolean DEBUG = false;
 
     private static ResourcesManager sResourcesManager;
     final ArrayMap<ResourcesKey, WeakReference<Resources> > mActiveResources
@@ -51,7 +49,6 @@ public class ResourcesManager {
     CompatibilityInfo mResCompatibilityInfo;
 
     Configuration mResConfiguration;
-    final Configuration mTmpConfig = new Configuration();
 
     public static ResourcesManager getInstance() {
         synchronized (ResourcesManager.class) {
@@ -144,30 +141,32 @@ public class ResourcesManager {
      * Creates the top level Resources for applications with the given compatibility info.
      *
      * @param resDir the resource directory.
+     * @param splitResDirs split resource directories.
      * @param overlayDirs the resource overlay directories.
      * @param libDirs the shared library resource dirs this app references.
-     * @param compatInfo the compability info. Must not be null.
-     * @param token the application token for determining stack bounds.
+     * @param displayId display Id.
+     * @param overrideConfiguration override configurations.
+     * @param compatInfo the compatibility info. Must not be null.
      */
     public Resources getTopLevelResources(String resDir, String[] splitResDirs,
             String[] overlayDirs, String[] libDirs, int displayId,
-            Configuration overrideConfiguration, CompatibilityInfo compatInfo, IBinder token) {
+            Configuration overrideConfiguration, CompatibilityInfo compatInfo) {
         final float scale = compatInfo.applicationScale;
-        ResourcesKey key = new ResourcesKey(resDir, displayId, overrideConfiguration, scale, token);
+        Configuration overrideConfigCopy = (overrideConfiguration != null)
+                ? new Configuration(overrideConfiguration) : null;
+        ResourcesKey key = new ResourcesKey(resDir, displayId, overrideConfigCopy, scale);
         Resources r;
         synchronized (this) {
             // Resources is app scale dependent.
-            if (false) {
-                Slog.w(TAG, "getTopLevelResources: " + resDir + " / " + scale);
-            }
+            if (DEBUG) Slog.w(TAG, "getTopLevelResources: " + resDir + " / " + scale);
+
             WeakReference<Resources> wr = mActiveResources.get(key);
             r = wr != null ? wr.get() : null;
             //if (r != null) Slog.i(TAG, "isUpToDate " + resDir + ": " + r.getAssets().isUpToDate());
             if (r != null && r.getAssets().isUpToDate()) {
-                if (false) {
-                    Slog.w(TAG, "Returning cached resources " + r + " " + resDir
-                            + ": appScale=" + r.getCompatibilityInfo().applicationScale);
-                }
+                if (DEBUG) Slog.w(TAG, "Returning cached resources " + r + " " + resDir
+                        + ": appScale=" + r.getCompatibilityInfo().applicationScale
+                        + " key=" + key + " overrideConfig=" + overrideConfiguration);
                 return r;
             }
         }
@@ -213,7 +212,7 @@ public class ResourcesManager {
         //Slog.i(TAG, "Resource: key=" + key + ", display metrics=" + metrics);
         DisplayMetrics dm = getDisplayMetricsLocked(displayId);
         Configuration config;
-        boolean isDefaultDisplay = (displayId == Display.DEFAULT_DISPLAY);
+        final boolean isDefaultDisplay = (displayId == Display.DEFAULT_DISPLAY);
         final boolean hasOverrideConfig = key.hasOverrideConfiguration();
         if (!isDefaultDisplay || hasOverrideConfig) {
             config = new Configuration(getConfiguration());
@@ -222,16 +221,14 @@ public class ResourcesManager {
             }
             if (hasOverrideConfig) {
                 config.updateFrom(key.mOverrideConfiguration);
+                if (DEBUG) Slog.v(TAG, "Applied overrideConfig=" + key.mOverrideConfiguration);
             }
         } else {
             config = getConfiguration();
         }
-        r = new Resources(assets, dm, config, compatInfo, token);
-        if (false) {
-            Slog.i(TAG, "Created app resources " + resDir + " " + r + ": "
-                    + r.getConfiguration() + " appScale="
-                    + r.getCompatibilityInfo().applicationScale);
-        }
+        r = new Resources(assets, dm, config, compatInfo);
+        if (DEBUG) Slog.i(TAG, "Created app resources " + resDir + " " + r + ": "
+                + r.getConfiguration() + " appScale=" + r.getCompatibilityInfo().applicationScale);
 
         synchronized (this) {
             WeakReference<Resources> wr = mActiveResources.get(key);
@@ -244,7 +241,8 @@ public class ResourcesManager {
             }
 
             // XXX need to remove entries when weak references go away
-            mActiveResources.put(key, new WeakReference<Resources>(r));
+            mActiveResources.put(key, new WeakReference<>(r));
+            if (DEBUG) Slog.v(TAG, "mActiveResources.size()=" + mActiveResources.size());
             return r;
         }
     }
@@ -255,7 +253,7 @@ public class ResourcesManager {
             mResConfiguration = new Configuration();
         }
         if (!mResConfiguration.isOtherSeqNewer(config) && compat == null) {
-            if (DEBUG_CONFIGURATION) Slog.v(TAG, "Skipping new config: curSeq="
+            if (DEBUG || DEBUG_CONFIGURATION) Slog.v(TAG, "Skipping new config: curSeq="
                     + mResConfiguration.seq + ", newSeq=" + config.seq);
             return false;
         }
@@ -287,7 +285,7 @@ public class ResourcesManager {
             ResourcesKey key = mActiveResources.keyAt(i);
             Resources r = mActiveResources.valueAt(i).get();
             if (r != null) {
-                if (DEBUG_CONFIGURATION) Slog.v(TAG, "Changing resources "
+                if (DEBUG || DEBUG_CONFIGURATION) Slog.v(TAG, "Changing resources "
                         + r + " config to: " + config);
                 int displayId = key.mDisplayId;
                 boolean isDefaultDisplay = (displayId == Display.DEFAULT_DISPLAY);
diff --git a/core/java/android/content/res/Resources.java b/core/java/android/content/res/Resources.java
index c931c01..6fb7299 100644
--- a/core/java/android/content/res/Resources.java
+++ b/core/java/android/content/res/Resources.java
@@ -141,9 +141,6 @@ public class Resources {
 
     private CompatibilityInfo mCompatibilityInfo = CompatibilityInfo.DEFAULT_COMPATIBILITY_INFO;
 
-    @SuppressWarnings("unused")
-    private WeakReference<IBinder> mToken;
-
     static {
         sPreloadedDrawables = new LongSparseArray[2];
         sPreloadedDrawables[0] = new LongSparseArray<ConstantState>();
@@ -224,46 +221,44 @@ public class Resources {
     /**
      * Create a new Resources object on top of an existing set of assets in an
      * AssetManager.
-     * 
-     * @param assets Previously created AssetManager. 
-     * @param metrics Current display metrics to consider when 
+     *
+     * @param assets Previously created AssetManager.
+     * @param metrics Current display metrics to consider when
      *                selecting/computing resource values.
-     * @param config Desired device configuration to consider when 
+     * @param config Desired device configuration to consider when
      *               selecting/computing resource values (optional).
      */
     public Resources(AssetManager assets, DisplayMetrics metrics, Configuration config) {
-        this(assets, metrics, config, CompatibilityInfo.DEFAULT_COMPATIBILITY_INFO, null);
+        this(assets, metrics, config, CompatibilityInfo.DEFAULT_COMPATIBILITY_INFO);
     }
 
     /**
      * Creates a new Resources object with CompatibilityInfo.
-     * 
-     * @param assets Previously created AssetManager. 
-     * @param metrics Current display metrics to consider when 
+     *
+     * @param assets Previously created AssetManager.
+     * @param metrics Current display metrics to consider when
      *                selecting/computing resource values.
-     * @param config Desired device configuration to consider when 
+     * @param config Desired device configuration to consider when
      *               selecting/computing resource values (optional).
      * @param compatInfo this resource's compatibility info. Must not be null.
-     * @param token The Activity token for determining stack affiliation. Usually null.
      * @hide
      */
     public Resources(AssetManager assets, DisplayMetrics metrics, Configuration config,
-            CompatibilityInfo compatInfo, IBinder token) {
+            CompatibilityInfo compatInfo) {
         mAssets = assets;
         mMetrics.setToDefaults();
         if (compatInfo != null) {
             mCompatibilityInfo = compatInfo;
         }
-        mToken = new WeakReference<IBinder>(token);
         updateConfiguration(config, metrics);
         assets.ensureStringBlocks();
     }
 
     /**
      * Return a global shared Resources object that provides access to only
-     * system resources (no application resources), and is not configured for 
-     * the current screen (can not use dimension units, does not change based 
-     * on orientation, etc). 
+     * system resources (no application resources), and is not configured for
+     * the current screen (can not use dimension units, does not change based
+     * on orientation, etc).
      */
     public static Resources getSystem() {
         synchronized (sSync) {
diff --git a/core/java/android/content/res/ResourcesKey.java b/core/java/android/content/res/ResourcesKey.java
index 4ae3825..9548d49 100644
--- a/core/java/android/content/res/ResourcesKey.java
+++ b/core/java/android/content/res/ResourcesKey.java
@@ -16,27 +16,23 @@
 
 package android.content.res;
 
-import android.os.IBinder;
+import java.util.Objects;
 
 /** @hide */
 public final class ResourcesKey {
-    final String mResDir;
-    final float mScale;
+    private final String mResDir;
+    private final float mScale;
     private final int mHash;
-    private final IBinder mToken;
 
     public final int mDisplayId;
-    public final Configuration mOverrideConfiguration = new Configuration();
+    public final Configuration mOverrideConfiguration;
 
     public ResourcesKey(String resDir, int displayId, Configuration overrideConfiguration,
-            float scale, IBinder token) {
+            float scale) {
         mResDir = resDir;
         mDisplayId = displayId;
-        if (overrideConfiguration != null) {
-            mOverrideConfiguration.setTo(overrideConfiguration);
-        }
+        mOverrideConfiguration = overrideConfiguration;
         mScale = scale;
-        mToken = token;
 
         int hash = 17;
         hash = 31 * hash + (mResDir == null ? 0 : mResDir.hashCode());
@@ -48,7 +44,8 @@ public final class ResourcesKey {
     }
 
     public boolean hasOverrideConfiguration() {
-        return !Configuration.EMPTY.equals(mOverrideConfiguration);
+        return mOverrideConfiguration != null
+                && !Configuration.EMPTY.equals(mOverrideConfiguration);
     }
 
     @Override
@@ -63,17 +60,9 @@ public final class ResourcesKey {
         }
         ResourcesKey peer = (ResourcesKey) obj;
 
-        if ((mResDir == null) && (peer.mResDir != null)) {
-            return false;
-        }
-        if ((mResDir != null) && (peer.mResDir == null)) {
+        if (!Objects.equals(mResDir, peer.mResDir)) {
             return false;
         }
-        if ((mResDir != null) && (peer.mResDir != null)) {
-            if (!mResDir.equals(peer.mResDir)) {
-                return false;
-            }
-        }
         if (mDisplayId != peer.mDisplayId) {
             return false;
         }
diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index 2935bc0..2b65c18 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -8162,12 +8162,14 @@ public final class ActivityManagerService extends ActivityManagerNative
     }
 
     @Override
-    public void resizeStack(int stackBoxId, Rect bounds) {
+    public void resizeStack(int stackId, Rect bounds) {
         enforceCallingPermission(android.Manifest.permission.MANAGE_ACTIVITY_STACKS,
                 "resizeStackBox()");
         long ident = Binder.clearCallingIdentity();
         try {
-            mWindowManager.resizeStack(stackBoxId, bounds);
+            synchronized (this) {
+                mStackSupervisor.resizeStackLocked(stackId, bounds);
+            }
         } finally {
             Binder.restoreCallingIdentity(ident);
         }
diff --git a/services/core/java/com/android/server/am/ActivityRecord.java b/services/core/java/com/android/server/am/ActivityRecord.java
index af6a314..8569ea4 100755
--- a/services/core/java/com/android/server/am/ActivityRecord.java
+++ b/services/core/java/com/android/server/am/ActivityRecord.java
@@ -127,6 +127,10 @@ final class ActivityRecord {
     long pauseTime;         // last time we started pausing the activity
     long launchTickTime;    // base time for launch tick messages
     Configuration configuration; // configuration activity was last running in
+    // Overridden configuration by the activity stack
+    // WARNING: Reference points to {@link ActivityStack#mOverrideConfig}, so its internal state
+    // should never be altered directly.
+    Configuration stackConfigOverride;
     CompatibilityInfo compat;// last used compatibility mode
     ActivityRecord resultTo; // who started this entry, so will get our reply
     final String resultWho; // additional identifier for use by resultTo.
@@ -204,6 +208,7 @@ final class ActivityRecord {
                 pw.print(" icon=0x"); pw.print(Integer.toHexString(icon));
                 pw.print(" theme=0x"); pw.println(Integer.toHexString(theme));
         pw.print(prefix); pw.print("config="); pw.println(configuration);
+        pw.print(prefix); pw.print("stackConfigOverride="); pw.println(stackConfigOverride);
         if (resultTo != null || resultWho != null) {
             pw.print(prefix); pw.print("resultTo="); pw.print(resultTo);
                     pw.print(" resultWho="); pw.print(resultWho);
@@ -394,6 +399,8 @@ final class ActivityRecord {
         resolvedType = _resolvedType;
         componentSpecified = _componentSpecified;
         configuration = _configuration;
+        stackConfigOverride = (container != null)
+                ? container.mStack.mOverrideConfig : Configuration.EMPTY;
         resultTo = _resultTo;
         resultWho = _resultWho;
         requestCode = _reqCode;
@@ -1066,10 +1073,7 @@ final class ActivityRecord {
 
     static ActivityRecord isInStackLocked(IBinder token) {
         final ActivityRecord r = ActivityRecord.forToken(token);
-        if (r != null) {
-            return r.task.stack.isInStackLocked(token);
-        }
-        return null;
+        return (r != null) ? r.task.stack.isInStackLocked(r) : null;
     }
 
     static ActivityStack getStackLocked(IBinder token) {
diff --git a/services/core/java/com/android/server/am/ActivityStack.java b/services/core/java/com/android/server/am/ActivityStack.java
index 5d21de7..7c1d54c 100644
--- a/services/core/java/com/android/server/am/ActivityStack.java
+++ b/services/core/java/com/android/server/am/ActivityStack.java
@@ -235,6 +235,8 @@ final class ActivityStack {
     /** Run all ActivityStacks through this */
     final ActivityStackSupervisor mStackSupervisor;
 
+    Configuration mOverrideConfig;
+
     static final int PAUSE_TIMEOUT_MSG = ActivityManagerService.FIRST_ACTIVITY_STACK_MSG + 1;
     static final int DESTROY_TIMEOUT_MSG = ActivityManagerService.FIRST_ACTIVITY_STACK_MSG + 2;
     static final int LAUNCH_TICK_MSG = ActivityManagerService.FIRST_ACTIVITY_STACK_MSG + 3;
@@ -348,6 +350,7 @@ final class ActivityStack {
         mStackId = activityContainer.mStackId;
         mCurrentUser = mService.mCurrentUserId;
         mRecentTasks = recentTasks;
+        mOverrideConfig = Configuration.EMPTY;
     }
 
     /**
@@ -450,13 +453,18 @@ final class ActivityStack {
 
     ActivityRecord isInStackLocked(IBinder token) {
         final ActivityRecord r = ActivityRecord.forToken(token);
-        if (r != null) {
-            final TaskRecord task = r.task;
-            if (task != null && task.mActivities.contains(r) && mTaskHistory.contains(task)) {
-                if (task.stack != this) Slog.w(TAG,
+        return isInStackLocked(r);
+    }
+
+    ActivityRecord isInStackLocked(ActivityRecord r) {
+        if (r == null) {
+            return null;
+        }
+        final TaskRecord task = r.task;
+        if (task != null && task.mActivities.contains(r) && mTaskHistory.contains(task)) {
+            if (task.stack != this) Slog.w(TAG,
                     "Illegal state! task does not point to stack it is in.");
-                return r;
-            }
+            return r;
         }
         return null;
     }
@@ -3264,7 +3272,7 @@ final class ActivityStack {
             }
             if (DEBUG_CONTAINERS) Slog.d(TAG, "activityDestroyedLocked: r=" + r);
 
-            if (isInStackLocked(token) != null) {
+            if (isInStackLocked(r) != null) {
                 if (r.state == ActivityState.DESTROYING) {
                     cleanUpActivityLocked(r, true, false);
                     removeActivityFromHistoryLocked(r);
@@ -3643,7 +3651,9 @@ final class ActivityStack {
         // Short circuit: if the two configurations are the exact same
         // object (the common case), then there is nothing to do.
         Configuration newConfig = mService.mConfiguration;
-        if (r.configuration == newConfig && !r.forceNewConfig) {
+        if (r.configuration == newConfig
+                && r.stackConfigOverride == mOverrideConfig
+                && !r.forceNewConfig) {
             if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
                     "Configuration unchanged in " + r);
             return true;
@@ -3659,14 +3669,22 @@ final class ActivityStack {
 
         // Okay we now are going to make this activity have the new config.
         // But then we need to figure out how it needs to deal with that.
-        Configuration oldConfig = r.configuration;
+        final Configuration oldConfig = r.configuration;
+        final Configuration oldStackOverride = r.stackConfigOverride;
         r.configuration = newConfig;
+        r.stackConfigOverride = mOverrideConfig;
 
         // Determine what has changed.  May be nothing, if this is a config
         // that has come back from the app after going idle.  In that case
         // we just want to leave the official config object now in the
         // activity and do nothing else.
-        final int changes = oldConfig.diff(newConfig);
+        int stackChanges = oldStackOverride.diff(mOverrideConfig);
+        if (stackChanges == 0 && !oldStackOverride.equals(mOverrideConfig)) {
+            // Assume size change if diff didn't report any changes,
+            // but configurations are not equal.
+            stackChanges = ActivityInfo.CONFIG_SCREEN_SIZE;
+        }
+        final int changes = oldConfig.diff(newConfig) | stackChanges;
         if (changes == 0 && !r.forceNewConfig) {
             if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
                     "Configuration no differences in " + r);
@@ -3770,8 +3788,9 @@ final class ActivityStack {
                     (andResume ? "Relaunching to RESUMED " : "Relaunching to PAUSED ")
                     + r);
             r.forceNewConfig = false;
-            r.app.thread.scheduleRelaunchActivity(r.appToken, results, newIntents,
-                    changes, !andResume, new Configuration(mService.mConfiguration));
+            r.app.thread.scheduleRelaunchActivity(r.appToken, results, newIntents, changes,
+                    !andResume, new Configuration(mService.mConfiguration),
+                    new Configuration(mOverrideConfig));
             // Note: don't need to call pauseIfSleepingLocked() here, because
             // the caller will only pass in 'andResume' if this activity is
             // currently resumed, which implies we aren't sleeping.
@@ -4132,4 +4151,10 @@ final class ActivityStack {
         return "ActivityStack{" + Integer.toHexString(System.identityHashCode(this))
                 + " stackId=" + mStackId + ", " + mTaskHistory.size() + " tasks}";
     }
+
+    boolean updateOverrideConfiguration(Configuration newConfig) {
+        Configuration oldConfig = mOverrideConfig;
+        mOverrideConfig = (newConfig == null) ? Configuration.EMPTY : newConfig;
+        return !mOverrideConfig.equals(oldConfig);
+    }
 }
diff --git a/services/core/java/com/android/server/am/ActivityStackSupervisor.java b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
index 4cf8f00..b1bb02a 100644
--- a/services/core/java/com/android/server/am/ActivityStackSupervisor.java
+++ b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
@@ -63,6 +63,7 @@ import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
 import android.content.res.Configuration;
 import android.graphics.Point;
+import android.graphics.Rect;
 import android.hardware.display.DisplayManager;
 import android.hardware.display.DisplayManager.DisplayListener;
 import android.hardware.display.DisplayManagerGlobal;
@@ -874,8 +875,7 @@ public final class ActivityStackSupervisor implements DisplayListener {
             } else {
                 stack = container.mStack;
             }
-            stack.mConfigWillChange = config != null
-                    && mService.mConfiguration.diff(config) != 0;
+            stack.mConfigWillChange = config != null && mService.mConfiguration.diff(config) != 0;
             if (DEBUG_CONFIGURATION) Slog.v(TAG,
                     "Starting activity when config will change = " + stack.mConfigWillChange);
 
@@ -1181,9 +1181,9 @@ public final class ActivityStackSupervisor implements DisplayListener {
             app.forceProcessStateUpTo(ActivityManager.PROCESS_STATE_TOP);
             app.thread.scheduleLaunchActivity(new Intent(r.intent), r.appToken,
                     System.identityHashCode(r), r.info, new Configuration(mService.mConfiguration),
-                    r.compat, r.launchedFromPackage, r.task.voiceInteractor, app.repProcState,
-                    r.icicle, r.persistentState, results, newIntents, !andResume,
-                    mService.isNextTransitionForward(), profilerInfo);
+                    new Configuration(stack.mOverrideConfig), r.compat, r.launchedFromPackage,
+                    r.task.voiceInteractor, app.repProcState, r.icicle, r.persistentState, results,
+                    newIntents, !andResume, mService.isNextTransitionForward(), profilerInfo);
 
             if ((app.info.flags&ApplicationInfo.FLAG_CANT_SAVE_STATE) != 0) {
                 // This may be a heavy-weight process!  Note that the package
@@ -2595,6 +2595,27 @@ public final class ActivityStackSupervisor implements DisplayListener {
         }
     }
 
+    void resizeStackLocked(int stackId, Rect bounds) {
+        final ActivityStack stack = getStack(stackId);
+        if (stack == null) {
+            Slog.w(TAG, "resizeStack: stackId " + stackId + " not found.");
+            return;
+        }
+        final Configuration overrideConfig = mWindowManager.resizeStack(stackId, bounds);
+        if (stack.updateOverrideConfiguration(overrideConfig)) {
+            final ActivityRecord r = stack.topRunningActivityLocked(null);
+            if (r != null) {
+                final boolean updated = stack.ensureActivityConfigurationLocked(r, 0);
+                // And we need to make sure at this point that all other activities
+                // are made visible with the correct configuration.
+                ensureActivitiesVisibleLocked(r, 0);
+                if (!updated) {
+                    resumeTopActivitiesLocked(stack, null, null);
+                }
+            }
+        }
+    }
+
     ActivityStack createStackOnDisplay(int stackId, int displayId) {
         ActivityDisplay activityDisplay = mActivityDisplays.get(displayId);
         if (activityDisplay == null) {
diff --git a/services/core/java/com/android/server/wm/TaskStack.java b/services/core/java/com/android/server/wm/TaskStack.java
index d6741b3..d6927e1 100644
--- a/services/core/java/com/android/server/wm/TaskStack.java
+++ b/services/core/java/com/android/server/wm/TaskStack.java
@@ -19,8 +19,10 @@ package com.android.server.wm;
 import static com.android.server.wm.WindowManagerService.DEBUG_TASK_MOVEMENT;
 import static com.android.server.wm.WindowManagerService.TAG;
 
+import android.content.res.Configuration;
 import android.graphics.Rect;
 import android.os.Debug;
+import android.util.DisplayMetrics;
 import android.util.EventLog;
 import android.util.Slog;
 import android.util.TypedValue;
@@ -78,9 +80,14 @@ public class TaskStack {
     /** Detach this stack from its display when animation completes. */
     boolean mDeferDetach;
 
+    // Contains configurations settings that are different from the global configuration due to
+    // stack specific operations. E.g. {@link #setBounds}.
+    Configuration mOverrideConfig;
+
     TaskStack(WindowManagerService service, int stackId) {
         mService = service;
         mStackId = stackId;
+        mOverrideConfig = Configuration.EMPTY;
         // TODO: remove bounds from log, they are always 0.
         EventLog.writeEvent(EventLogTags.WM_STACK_CREATED, stackId, mBounds.left, mBounds.top,
                 mBounds.right, mBounds.bottom);
@@ -129,7 +136,7 @@ public class TaskStack {
         mDimLayer.setBounds(bounds);
         mAnimationBackgroundSurface.setBounds(bounds);
         mBounds.set(bounds);
-
+        updateOverrideConfiguration();
         return true;
     }
 
@@ -137,6 +144,27 @@ public class TaskStack {
         out.set(mBounds);
     }
 
+    void updateOverrideConfiguration() {
+        final Configuration serviceConfig = mService.mCurConfiguration;
+        if (mFullscreen) {
+            mOverrideConfig = Configuration.EMPTY;
+            return;
+        }
+
+        if (mOverrideConfig == Configuration.EMPTY) {
+            mOverrideConfig  = new Configuration();
+        }
+
+        // TODO(multidisplay): Update Dp to that of display stack is on.
+        final float density = serviceConfig.densityDpi * DisplayMetrics.DENSITY_DEFAULT_SCALE;
+        mOverrideConfig.screenWidthDp =
+                Math.min((int)(mBounds.width() / density), serviceConfig.screenWidthDp);
+        mOverrideConfig.screenHeightDp =
+                Math.min((int)(mBounds.height() / density), serviceConfig.screenHeightDp);
+        mOverrideConfig.smallestScreenWidthDp =
+                Math.min(mOverrideConfig.screenWidthDp, mOverrideConfig.screenHeightDp);
+    }
+
     void updateDisplayInfo() {
         if (mFullscreen && mDisplayContent != null) {
             mDisplayContent.getLogicalDisplayRect(mTmpRect);
diff --git a/services/core/java/com/android/server/wm/WindowManagerService.java b/services/core/java/com/android/server/wm/WindowManagerService.java
index 2c05e93..46db132 100644
--- a/services/core/java/com/android/server/wm/WindowManagerService.java
+++ b/services/core/java/com/android/server/wm/WindowManagerService.java
@@ -5128,7 +5128,12 @@ public class WindowManagerService extends IWindowManager.Stub
         }
     }
 
-    public void resizeStack(int stackId, Rect bounds) {
+    /**
+     * Re-sizes the specified stack and its containing windows.
+     * Returns a {@link Configuration} object that contains configurations settings
+     * that should be overridden due to the operation.
+     */
+    public Configuration resizeStack(int stackId, Rect bounds) {
         synchronized (mWindowMap) {
             final TaskStack stack = mStackIdToStack.get(stackId);
             if (stack == null) {
@@ -5140,6 +5145,7 @@ public class WindowManagerService extends IWindowManager.Stub
                 stack.getDisplayContent().layoutNeeded = true;
                 performLayoutAndPlaceSurfacesLocked();
             }
+            return new Configuration(stack.mOverrideConfig);
         }
     }
 
@@ -7068,7 +7074,7 @@ public class WindowManagerService extends IWindowManager.Stub
         return sw;
     }
 
-    boolean computeScreenConfigurationLocked(Configuration config) {
+    private boolean computeScreenConfigurationLocked(Configuration config) {
         if (!mDisplayReady) {
             return false;
         }
diff --git a/services/core/java/com/android/server/wm/WindowState.java b/services/core/java/com/android/server/wm/WindowState.java
index 978f5c3..a22ba33 100644
--- a/services/core/java/com/android/server/wm/WindowState.java
+++ b/services/core/java/com/android/server/wm/WindowState.java
@@ -130,7 +130,8 @@ final class WindowState implements WindowManagerPolicy.WindowState {
 
     int mLayoutSeq = -1;
 
-    Configuration mConfiguration = null;
+    private Configuration mConfiguration = Configuration.EMPTY;
+    private Configuration mOverrideConfig = Configuration.EMPTY;
     // Sticky answer to isConfigChanged(), remains true until new Configuration is assigned.
     // Used only on {@link #TYPE_KEYGUARD}.
     private boolean mConfigHasChanged;
@@ -1076,9 +1077,13 @@ final class WindowState implements WindowManagerPolicy.WindowState {
     }
 
     boolean isConfigChanged() {
-        boolean configChanged = mConfiguration != mService.mCurConfiguration
-                && (mConfiguration == null
-                        || (mConfiguration.diff(mService.mCurConfiguration) != 0));
+        final TaskStack stack = getStack();
+        final Configuration overrideConfig =
+                (stack != null) ? stack.mOverrideConfig : Configuration.EMPTY;
+        final Configuration serviceConfig = mService.mCurConfiguration;
+        boolean configChanged =
+                (mConfiguration != serviceConfig && mConfiguration.diff(serviceConfig) != 0)
+                || (mOverrideConfig != overrideConfig && !mOverrideConfig.equals(overrideConfig));
 
         if ((mAttrs.privateFlags & PRIVATE_FLAG_KEYGUARD) != 0) {
             // Retain configuration changed status until resetConfiguration called.
@@ -1107,8 +1112,10 @@ final class WindowState implements WindowManagerPolicy.WindowState {
         }
     }
 
-    void setConfiguration(final Configuration newConfig) {
+    private void setConfiguration(
+            final Configuration newConfig, final Configuration newOverrideConfig) {
         mConfiguration = newConfig;
+        mOverrideConfig = newOverrideConfig;
         mConfigHasChanged = false;
     }
 
@@ -1384,12 +1391,15 @@ final class WindowState implements WindowManagerPolicy.WindowState {
             if (DEBUG_RESIZE || DEBUG_ORIENTATION) Slog.v(TAG, "Reporting new frame to " + this
                     + ": " + mCompatFrame);
             boolean configChanged = isConfigChanged();
+            final TaskStack stack = getStack();
+            final Configuration overrideConfig =
+                    (stack != null) ? stack.mOverrideConfig : Configuration.EMPTY;
             if ((DEBUG_RESIZE || DEBUG_ORIENTATION || DEBUG_CONFIGURATION) && configChanged) {
                 Slog.i(TAG, "Sending new config to window " + this + ": "
-                        + mWinAnimator.mSurfaceW + "x" + mWinAnimator.mSurfaceH
-                        + " / " + mService.mCurConfiguration);
+                        + mWinAnimator.mSurfaceW + "x" + mWinAnimator.mSurfaceH + " / config="
+                        + mService.mCurConfiguration + " overrideConfig=" + overrideConfig);
             }
-            setConfiguration(mService.mCurConfiguration);
+            setConfiguration(mService.mCurConfiguration, overrideConfig);
             if (DEBUG_ORIENTATION && mWinAnimator.mDrawState == WindowStateAnimator.DRAW_PENDING)
                 Slog.i(TAG, "Resizing " + this + " WITH DRAW PENDING");