Merge "Add support for Split APK dependcies"
diff --git a/api/current.txt b/api/current.txt
index 57a1b66..18e4adf 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -739,6 +739,7 @@
     field public static final int isScrollContainer = 16843342; // 0x101024e
     field public static final int isSticky = 16843335; // 0x1010247
     field public static final int isolatedProcess = 16843689; // 0x10103a9
+    field public static final int isolatedSplits = 16844109; // 0x101054d
     field public static final int itemBackground = 16843056; // 0x1010130
     field public static final int itemIconDisabledAlpha = 16843057; // 0x1010131
     field public static final int itemPadding = 16843565; // 0x101032d
@@ -8365,6 +8366,7 @@
     method public abstract int checkUriPermission(android.net.Uri, java.lang.String, java.lang.String, int, int, int);
     method public abstract deprecated void clearWallpaper() throws java.io.IOException;
     method public abstract android.content.Context createConfigurationContext(android.content.res.Configuration);
+    method public abstract android.content.Context createContextForSplit(java.lang.String) throws android.content.pm.PackageManager.NameNotFoundException;
     method public abstract android.content.Context createDeviceProtectedStorageContext();
     method public abstract android.content.Context createDisplayContext(android.view.Display);
     method public abstract android.content.Context createPackageContext(java.lang.String, int) throws android.content.pm.PackageManager.NameNotFoundException;
@@ -8563,6 +8565,7 @@
     method public int checkUriPermission(android.net.Uri, java.lang.String, java.lang.String, int, int, int);
     method public deprecated void clearWallpaper() throws java.io.IOException;
     method public android.content.Context createConfigurationContext(android.content.res.Configuration);
+    method public android.content.Context createContextForSplit(java.lang.String) throws android.content.pm.PackageManager.NameNotFoundException;
     method public android.content.Context createDeviceProtectedStorageContext();
     method public android.content.Context createDisplayContext(android.view.Display);
     method public android.content.Context createPackageContext(java.lang.String, int) throws android.content.pm.PackageManager.NameNotFoundException;
@@ -9747,6 +9750,7 @@
     field public int requiresSmallestWidthDp;
     field public java.lang.String[] sharedLibraryFiles;
     field public java.lang.String sourceDir;
+    field public java.lang.String[] splitNames;
     field public java.lang.String[] splitPublicSourceDirs;
     field public java.lang.String[] splitSourceDirs;
     field public int targetSdkVersion;
@@ -9829,6 +9833,7 @@
     field public boolean handleProfiling;
     field public java.lang.String publicSourceDir;
     field public java.lang.String sourceDir;
+    field public java.lang.String[] splitNames;
     field public java.lang.String[] splitPublicSourceDirs;
     field public java.lang.String[] splitSourceDirs;
     field public java.lang.String targetPackage;
@@ -29977,6 +29982,7 @@
     method public final android.util.SizeF readSizeF();
     method public final android.util.SparseArray readSparseArray(java.lang.ClassLoader);
     method public final android.util.SparseBooleanArray readSparseBooleanArray();
+    method public final android.util.SparseIntArray readSparseIntArray();
     method public final java.lang.String readString();
     method public final void readStringArray(java.lang.String[]);
     method public final void readStringList(java.util.List<java.lang.String>);
@@ -30021,6 +30027,7 @@
     method public final void writeSizeF(android.util.SizeF);
     method public final void writeSparseArray(android.util.SparseArray<java.lang.Object>);
     method public final void writeSparseBooleanArray(android.util.SparseBooleanArray);
+    method public final void writeSparseIntArray(android.util.SparseIntArray);
     method public final void writeString(java.lang.String);
     method public final void writeStringArray(java.lang.String[]);
     method public final void writeStringList(java.util.List<java.lang.String>);
@@ -39262,6 +39269,7 @@
     method public int checkUriPermission(android.net.Uri, java.lang.String, java.lang.String, int, int, int);
     method public void clearWallpaper();
     method public android.content.Context createConfigurationContext(android.content.res.Configuration);
+    method public android.content.Context createContextForSplit(java.lang.String) throws android.content.pm.PackageManager.NameNotFoundException;
     method public android.content.Context createDeviceProtectedStorageContext();
     method public android.content.Context createDisplayContext(android.view.Display);
     method public android.content.Context createPackageContext(java.lang.String, int) throws android.content.pm.PackageManager.NameNotFoundException;
diff --git a/api/system-current.txt b/api/system-current.txt
index 8d902d1..a192c92 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -850,6 +850,7 @@
     field public static final int isScrollContainer = 16843342; // 0x101024e
     field public static final int isSticky = 16843335; // 0x1010247
     field public static final int isolatedProcess = 16843689; // 0x10103a9
+    field public static final int isolatedSplits = 16844109; // 0x101054d
     field public static final int itemBackground = 16843056; // 0x1010130
     field public static final int itemIconDisabledAlpha = 16843057; // 0x1010131
     field public static final int itemPadding = 16843565; // 0x101032d
@@ -8747,6 +8748,7 @@
     method public abstract int checkUriPermission(android.net.Uri, java.lang.String, java.lang.String, int, int, int);
     method public abstract deprecated void clearWallpaper() throws java.io.IOException;
     method public abstract android.content.Context createConfigurationContext(android.content.res.Configuration);
+    method public abstract android.content.Context createContextForSplit(java.lang.String) throws android.content.pm.PackageManager.NameNotFoundException;
     method public abstract android.content.Context createCredentialProtectedStorageContext();
     method public abstract android.content.Context createDeviceProtectedStorageContext();
     method public abstract android.content.Context createDisplayContext(android.view.Display);
@@ -8957,6 +8959,7 @@
     method public int checkUriPermission(android.net.Uri, java.lang.String, java.lang.String, int, int, int);
     method public deprecated void clearWallpaper() throws java.io.IOException;
     method public android.content.Context createConfigurationContext(android.content.res.Configuration);
+    method public android.content.Context createContextForSplit(java.lang.String) throws android.content.pm.PackageManager.NameNotFoundException;
     method public android.content.Context createCredentialProtectedStorageContext();
     method public android.content.Context createDeviceProtectedStorageContext();
     method public android.content.Context createDisplayContext(android.view.Display);
@@ -10162,6 +10165,7 @@
     field public int requiresSmallestWidthDp;
     field public java.lang.String[] sharedLibraryFiles;
     field public java.lang.String sourceDir;
+    field public java.lang.String[] splitNames;
     field public java.lang.String[] splitPublicSourceDirs;
     field public java.lang.String[] splitSourceDirs;
     field public int targetSdkVersion;
@@ -10279,6 +10283,7 @@
     field public boolean handleProfiling;
     field public java.lang.String publicSourceDir;
     field public java.lang.String sourceDir;
+    field public java.lang.String[] splitNames;
     field public java.lang.String[] splitPublicSourceDirs;
     field public java.lang.String[] splitSourceDirs;
     field public java.lang.String targetPackage;
@@ -32693,6 +32698,7 @@
     method public final android.util.SizeF readSizeF();
     method public final android.util.SparseArray readSparseArray(java.lang.ClassLoader);
     method public final android.util.SparseBooleanArray readSparseBooleanArray();
+    method public final android.util.SparseIntArray readSparseIntArray();
     method public final java.lang.String readString();
     method public final void readStringArray(java.lang.String[]);
     method public final void readStringList(java.util.List<java.lang.String>);
@@ -32737,6 +32743,7 @@
     method public final void writeSizeF(android.util.SizeF);
     method public final void writeSparseArray(android.util.SparseArray<java.lang.Object>);
     method public final void writeSparseBooleanArray(android.util.SparseBooleanArray);
+    method public final void writeSparseIntArray(android.util.SparseIntArray);
     method public final void writeString(java.lang.String);
     method public final void writeStringArray(java.lang.String[]);
     method public final void writeStringList(java.util.List<java.lang.String>);
@@ -42625,6 +42632,7 @@
     method public int checkUriPermission(android.net.Uri, java.lang.String, java.lang.String, int, int, int);
     method public void clearWallpaper();
     method public android.content.Context createConfigurationContext(android.content.res.Configuration);
+    method public android.content.Context createContextForSplit(java.lang.String) throws android.content.pm.PackageManager.NameNotFoundException;
     method public android.content.Context createCredentialProtectedStorageContext();
     method public android.content.Context createDeviceProtectedStorageContext();
     method public android.content.Context createDisplayContext(android.view.Display);
diff --git a/api/test-current.txt b/api/test-current.txt
index 35ebf83..47440e6 100644
--- a/api/test-current.txt
+++ b/api/test-current.txt
@@ -739,6 +739,7 @@
     field public static final int isScrollContainer = 16843342; // 0x101024e
     field public static final int isSticky = 16843335; // 0x1010247
     field public static final int isolatedProcess = 16843689; // 0x10103a9
+    field public static final int isolatedSplits = 16844109; // 0x101054d
     field public static final int itemBackground = 16843056; // 0x1010130
     field public static final int itemIconDisabledAlpha = 16843057; // 0x1010131
     field public static final int itemPadding = 16843565; // 0x101032d
@@ -8388,6 +8389,7 @@
     method public abstract int checkUriPermission(android.net.Uri, java.lang.String, java.lang.String, int, int, int);
     method public abstract deprecated void clearWallpaper() throws java.io.IOException;
     method public abstract android.content.Context createConfigurationContext(android.content.res.Configuration);
+    method public abstract android.content.Context createContextForSplit(java.lang.String) throws android.content.pm.PackageManager.NameNotFoundException;
     method public abstract android.content.Context createDeviceProtectedStorageContext();
     method public abstract android.content.Context createDisplayContext(android.view.Display);
     method public abstract android.content.Context createPackageContext(java.lang.String, int) throws android.content.pm.PackageManager.NameNotFoundException;
@@ -8587,6 +8589,7 @@
     method public int checkUriPermission(android.net.Uri, java.lang.String, java.lang.String, int, int, int);
     method public deprecated void clearWallpaper() throws java.io.IOException;
     method public android.content.Context createConfigurationContext(android.content.res.Configuration);
+    method public android.content.Context createContextForSplit(java.lang.String) throws android.content.pm.PackageManager.NameNotFoundException;
     method public android.content.Context createDeviceProtectedStorageContext();
     method public android.content.Context createDisplayContext(android.view.Display);
     method public android.content.Context createPackageContext(java.lang.String, int) throws android.content.pm.PackageManager.NameNotFoundException;
@@ -9774,6 +9777,7 @@
     field public int requiresSmallestWidthDp;
     field public java.lang.String[] sharedLibraryFiles;
     field public java.lang.String sourceDir;
+    field public java.lang.String[] splitNames;
     field public java.lang.String[] splitPublicSourceDirs;
     field public java.lang.String[] splitSourceDirs;
     field public int targetSdkVersion;
@@ -9856,6 +9860,7 @@
     field public boolean handleProfiling;
     field public java.lang.String publicSourceDir;
     field public java.lang.String sourceDir;
+    field public java.lang.String[] splitNames;
     field public java.lang.String[] splitPublicSourceDirs;
     field public java.lang.String[] splitSourceDirs;
     field public java.lang.String targetPackage;
@@ -30088,6 +30093,7 @@
     method public final android.util.SizeF readSizeF();
     method public final android.util.SparseArray readSparseArray(java.lang.ClassLoader);
     method public final android.util.SparseBooleanArray readSparseBooleanArray();
+    method public final android.util.SparseIntArray readSparseIntArray();
     method public final java.lang.String readString();
     method public final void readStringArray(java.lang.String[]);
     method public final void readStringList(java.util.List<java.lang.String>);
@@ -30132,6 +30138,7 @@
     method public final void writeSizeF(android.util.SizeF);
     method public final void writeSparseArray(android.util.SparseArray<java.lang.Object>);
     method public final void writeSparseBooleanArray(android.util.SparseBooleanArray);
+    method public final void writeSparseIntArray(android.util.SparseIntArray);
     method public final void writeString(java.lang.String);
     method public final void writeStringArray(java.lang.String[]);
     method public final void writeStringList(java.util.List<java.lang.String>);
@@ -39395,6 +39402,7 @@
     method public int checkUriPermission(android.net.Uri, java.lang.String, java.lang.String, int, int, int);
     method public void clearWallpaper();
     method public android.content.Context createConfigurationContext(android.content.res.Configuration);
+    method public android.content.Context createContextForSplit(java.lang.String) throws android.content.pm.PackageManager.NameNotFoundException;
     method public android.content.Context createDeviceProtectedStorageContext();
     method public android.content.Context createDisplayContext(android.view.Display);
     method public android.content.Context createPackageContext(java.lang.String, int) throws android.content.pm.PackageManager.NameNotFoundException;
diff --git a/cmds/pm/src/com/android/commands/pm/Pm.java b/cmds/pm/src/com/android/commands/pm/Pm.java
index ac5fea3..7015381 100644
--- a/cmds/pm/src/com/android/commands/pm/Pm.java
+++ b/cmds/pm/src/com/android/commands/pm/Pm.java
@@ -408,7 +408,7 @@
             if (file.isFile()) {
                 try {
                     ApkLite baseApk = PackageParser.parseApkLite(file, 0);
-                    PackageLite pkgLite = new PackageLite(null, baseApk, null, null, null);
+                    PackageLite pkgLite = new PackageLite(null, baseApk, null, null, null, null);
                     params.sessionParams.setSize(
                             PackageHelper.calculateInstalledSize(pkgLite, false,
                             params.sessionParams.abiOverride));
diff --git a/core/java/android/app/ActivityThread.java b/core/java/android/app/ActivityThread.java
index d814ddc..34eaa0b 100644
--- a/core/java/android/app/ActivityThread.java
+++ b/core/java/android/app/ActivityThread.java
@@ -2616,9 +2616,10 @@
                     r.activityInfo.targetActivity);
         }
 
+        ContextImpl appContext = createBaseContextForActivity(r);
         Activity activity = null;
         try {
-            java.lang.ClassLoader cl = r.packageInfo.getClassLoader();
+            java.lang.ClassLoader cl = appContext.getClassLoader();
             activity = mInstrumentation.newActivity(
                     cl, component.getClassName(), r.intent);
             StrictMode.incrementExpectedActivityCount(activity.getClass());
@@ -2647,7 +2648,6 @@
                     + ", dir=" + r.packageInfo.getAppDir());
 
             if (activity != null) {
-                Context appContext = createBaseContextForActivity(r, activity);
                 CharSequence title = r.activityInfo.loadLabel(appContext.getPackageManager());
                 Configuration config = new Configuration(mCompatConfiguration);
                 if (r.overrideConfig != null) {
@@ -2661,6 +2661,7 @@
                     r.mPendingRemoveWindow = null;
                     r.mPendingRemoveWindowManager = null;
                 }
+                appContext.setOuterContext(activity);
                 activity.attach(appContext, this, getInstrumentation(), r.token,
                         r.ident, app, r.intent, r.activityInfo, title, r.parent,
                         r.embeddedID, r.lastNonConfigurationInstances, config,
@@ -2736,8 +2737,8 @@
         return activity;
     }
 
-    private Context createBaseContextForActivity(ActivityClientRecord r, final Activity activity) {
-        int displayId = Display.DEFAULT_DISPLAY;
+    private ContextImpl createBaseContextForActivity(ActivityClientRecord r) {
+        final int displayId;
         try {
             displayId = ActivityManager.getService().getActivityDisplayId(r.token);
         } catch (RemoteException e) {
@@ -2745,9 +2746,7 @@
         }
 
         ContextImpl appContext = ContextImpl.createActivityContext(
-                this, r.packageInfo, r.token, displayId, r.overrideConfig);
-        appContext.setOuterContext(activity);
-        Context baseContext = appContext;
+                this, r.packageInfo, r.activityInfo, r.token, displayId, r.overrideConfig);
 
         final DisplayManagerGlobal dm = DisplayManagerGlobal.getInstance();
         // For debugging purposes, if the activity's package name contains the value of
@@ -2760,12 +2759,12 @@
                 if (id != Display.DEFAULT_DISPLAY) {
                     Display display =
                             dm.getCompatibleDisplay(id, appContext.getDisplayAdjustments(id));
-                    baseContext = appContext.createDisplayContext(display);
+                    appContext = (ContextImpl) appContext.createDisplayContext(display);
                     break;
                 }
             }
         }
-        return baseContext;
+        return appContext;
     }
 
     private void handleLaunchActivity(ActivityClientRecord r, Intent customIntent, String reason) {
@@ -3119,9 +3118,16 @@
 
         IActivityManager mgr = ActivityManager.getService();
 
+        Application app;
         BroadcastReceiver receiver;
+        ContextImpl context;
         try {
-            java.lang.ClassLoader cl = packageInfo.getClassLoader();
+            app = packageInfo.makeApplication(false, mInstrumentation);
+            context = (ContextImpl) app.getBaseContext();
+            if (data.info.splitName != null) {
+                context = (ContextImpl) context.createContextForSplit(data.info.splitName);
+            }
+            java.lang.ClassLoader cl = context.getClassLoader();
             data.intent.setExtrasClassLoader(cl);
             data.intent.prepareToEnterProcess();
             data.setExtrasClassLoader(cl);
@@ -3136,8 +3142,6 @@
         }
 
         try {
-            Application app = packageInfo.makeApplication(false, mInstrumentation);
-
             if (localLOGV) Slog.v(
                 TAG, "Performing receive of " + data.intent
                 + ": app=" + app
@@ -3146,7 +3150,6 @@
                 + ", comp=" + data.intent.getComponent().toShortString()
                 + ", dir=" + packageInfo.getAppDir());
 
-            ContextImpl context = (ContextImpl)app.getBaseContext();
             sCurrentBroadcastIntent.set(data.intent);
             receiver.setPendingResult(data);
             receiver.onReceive(context.getReceiverRestrictedContext(),
@@ -6031,6 +6034,15 @@
                       info.name);
                 return null;
             }
+
+            if (info.splitName != null) {
+                try {
+                    c = c.createContextForSplit(info.splitName);
+                } catch (NameNotFoundException e) {
+                    throw new RuntimeException(e);
+                }
+            }
+
             try {
                 final java.lang.ClassLoader cl = c.getClassLoader();
                 localProvider = (ContentProvider)cl.
diff --git a/core/java/android/app/ContextImpl.java b/core/java/android/app/ContextImpl.java
index d37888d..9db2b92 100644
--- a/core/java/android/app/ContextImpl.java
+++ b/core/java/android/app/ContextImpl.java
@@ -32,6 +32,7 @@
 import android.content.ReceiverCallNotAllowedException;
 import android.content.ServiceConnection;
 import android.content.SharedPreferences;
+import android.content.pm.ActivityInfo;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.IPackageManager;
 import android.content.pm.PackageManager;
@@ -58,21 +59,27 @@
 import android.os.Process;
 import android.os.RemoteException;
 import android.os.ServiceManager;
+import android.os.Trace;
 import android.os.UserHandle;
 import android.os.storage.IStorageManager;
 import android.system.ErrnoException;
 import android.system.Os;
 import android.system.OsConstants;
+import android.text.TextUtils;
 import android.util.AndroidRuntimeException;
 import android.util.ArrayMap;
+import android.util.IntArray;
 import android.util.Log;
 import android.util.Slog;
+import android.util.SparseBooleanArray;
 import android.view.Display;
 import android.view.DisplayAdjustments;
 
 import com.android.internal.annotations.GuardedBy;
 import com.android.internal.util.Preconditions;
 
+import dalvik.system.PathClassLoader;
+
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
@@ -80,6 +87,8 @@
 import java.io.FilenameFilter;
 import java.io.IOException;
 import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Objects;
 
 class ReceiverRestrictedContext extends ContextWrapper {
@@ -147,6 +156,7 @@
 
     final ActivityThread mMainThread;
     final LoadedApk mPackageInfo;
+    private ClassLoader mClassLoader;
 
     private final IBinder mActivityToken;
 
@@ -272,8 +282,7 @@
 
     @Override
     public ClassLoader getClassLoader() {
-        return mPackageInfo != null ?
-                mPackageInfo.getClassLoader() : ClassLoader.getSystemClassLoader();
+        return mClassLoader != null ? mClassLoader : (mPackageInfo != null ? mPackageInfo.getClassLoader() : ClassLoader.getSystemClassLoader());
     }
 
     @Override
@@ -1887,7 +1896,7 @@
                 pi.getResDir(),
                 pi.getSplitResDirs(),
                 pi.getOverlayDirs(),
-                pi.getApplicationInfo().sharedLibraryFiles,
+                pi.getSharedLibraries(),
                 displayId,
                 overrideConfig,
                 compatInfo,
@@ -1901,7 +1910,8 @@
                 flags | CONTEXT_REGISTER_PACKAGE);
         if (pi != null) {
             ContextImpl c = new ContextImpl(this, mMainThread, pi, mActivityToken,
-                    new UserHandle(UserHandle.getUserId(application.uid)), flags);
+                    new UserHandle(UserHandle.getUserId(application.uid)), flags,
+                    null);
 
             final int displayId = mDisplay != null
                     ? mDisplay.getDisplayId() : Display.DEFAULT_DISPLAY;
@@ -1930,13 +1940,15 @@
         if (packageName.equals("system") || packageName.equals("android")) {
             // The system resources are loaded in every application, so we can safely copy
             // the context without reloading Resources.
-            return new ContextImpl(this, mMainThread, mPackageInfo, mActivityToken, user, flags);
+            return new ContextImpl(this, mMainThread, mPackageInfo, mActivityToken, user, flags,
+                    null);
         }
 
         LoadedApk pi = mMainThread.getPackageInfo(packageName, mResources.getCompatibilityInfo(),
                 flags | CONTEXT_REGISTER_PACKAGE, user.getIdentifier());
         if (pi != null) {
-            ContextImpl c = new ContextImpl(this, mMainThread, pi, mActivityToken, user, flags);
+            ContextImpl c = new ContextImpl(this, mMainThread, pi, mActivityToken, user, flags,
+                    null);
 
             final int displayId = mDisplay != null
                     ? mDisplay.getDisplayId() : Display.DEFAULT_DISPLAY;
@@ -1954,13 +1966,42 @@
     }
 
     @Override
+    public Context createContextForSplit(String splitName) throws NameNotFoundException {
+        if (!mPackageInfo.getApplicationInfo().requestsIsolatedSplitLoading()) {
+            // All Splits are always loaded.
+            return this;
+        }
+
+        final ClassLoader classLoader = mPackageInfo.getSplitClassLoader(splitName);
+        final String[] paths = mPackageInfo.getSplitPaths(splitName);
+
+        final ContextImpl context = new ContextImpl(this, mMainThread, mPackageInfo,
+                mActivityToken, mUser, mFlags, classLoader);
+
+        final int displayId = mDisplay != null
+                ? mDisplay.getDisplayId() : Display.DEFAULT_DISPLAY;
+
+        context.mResources = ResourcesManager.getInstance().getResources(
+                mActivityToken,
+                mPackageInfo.getResDir(),
+                paths,
+                mPackageInfo.getOverlayDirs(),
+                mPackageInfo.getApplicationInfo().sharedLibraryFiles,
+                displayId,
+                null,
+                mPackageInfo.getCompatibilityInfo(),
+                classLoader);
+        return context;
+    }
+
+    @Override
     public Context createConfigurationContext(Configuration overrideConfiguration) {
         if (overrideConfiguration == null) {
             throw new IllegalArgumentException("overrideConfiguration must not be null");
         }
 
         ContextImpl context = new ContextImpl(this, mMainThread, mPackageInfo, mActivityToken,
-                mUser, mFlags);
+                mUser, mFlags, mClassLoader);
 
         final int displayId = mDisplay != null ? mDisplay.getDisplayId() : Display.DEFAULT_DISPLAY;
         context.mResources = createResources(mActivityToken, mPackageInfo, displayId,
@@ -1975,7 +2016,7 @@
         }
 
         ContextImpl context = new ContextImpl(this, mMainThread, mPackageInfo, mActivityToken,
-                mUser, mFlags);
+                mUser, mFlags, mClassLoader);
 
         final int displayId = display.getDisplayId();
         context.mResources = createResources(mActivityToken, mPackageInfo, displayId, null,
@@ -1988,14 +2029,16 @@
     public Context createDeviceProtectedStorageContext() {
         final int flags = (mFlags & ~Context.CONTEXT_CREDENTIAL_PROTECTED_STORAGE)
                 | Context.CONTEXT_DEVICE_PROTECTED_STORAGE;
-        return new ContextImpl(this, mMainThread, mPackageInfo, mActivityToken, mUser, flags);
+        return new ContextImpl(this, mMainThread, mPackageInfo, mActivityToken, mUser, flags,
+                mClassLoader);
     }
 
     @Override
     public Context createCredentialProtectedStorageContext() {
         final int flags = (mFlags & ~Context.CONTEXT_DEVICE_PROTECTED_STORAGE)
                 | Context.CONTEXT_CREDENTIAL_PROTECTED_STORAGE;
-        return new ContextImpl(this, mMainThread, mPackageInfo, mActivityToken, mUser, flags);
+        return new ContextImpl(this, mMainThread, mPackageInfo, mActivityToken, mUser, flags,
+                mClassLoader);
     }
 
     @Override
@@ -2082,8 +2125,9 @@
 
     static ContextImpl createSystemContext(ActivityThread mainThread) {
         LoadedApk packageInfo = new LoadedApk(mainThread);
-        ContextImpl context = new ContextImpl(null, mainThread, packageInfo, null, null, 0);
-        context.mResources = packageInfo.getResources(mainThread);
+        ContextImpl context = new ContextImpl(null, mainThread, packageInfo, null, null, 0,
+                null);
+        context.mResources = packageInfo.getResources();
         context.mResources.updateConfiguration(context.mResourcesManager.getConfiguration(),
                 context.mResourcesManager.getDisplayMetrics());
         return context;
@@ -2091,18 +2135,35 @@
 
     static ContextImpl createAppContext(ActivityThread mainThread, LoadedApk packageInfo) {
         if (packageInfo == null) throw new IllegalArgumentException("packageInfo");
-        ContextImpl context = new ContextImpl(null, mainThread, packageInfo, null, null, 0);
-        context.mResources = packageInfo.getResources(mainThread);
+        ContextImpl context = new ContextImpl(null, mainThread, packageInfo, null, null, 0,
+                null);
+        context.mResources = packageInfo.getResources();
         return context;
     }
 
     static ContextImpl createActivityContext(ActivityThread mainThread,
-            LoadedApk packageInfo, IBinder activityToken, int displayId,
+            LoadedApk packageInfo, ActivityInfo activityInfo, IBinder activityToken, int displayId,
             Configuration overrideConfiguration) {
         if (packageInfo == null) throw new IllegalArgumentException("packageInfo");
 
+        String[] splitDirs = packageInfo.getSplitResDirs();
+        ClassLoader classLoader = packageInfo.getClassLoader();
+
+        if (packageInfo.getApplicationInfo().requestsIsolatedSplitLoading()) {
+            Trace.traceBegin(Trace.TRACE_TAG_RESOURCES, "SplitDependencies");
+            try {
+                classLoader = packageInfo.getSplitClassLoader(activityInfo.splitName);
+                splitDirs = packageInfo.getSplitPaths(activityInfo.splitName);
+            } catch (NameNotFoundException e) {
+                // Nothing above us can handle a NameNotFoundException, better crash.
+                throw new RuntimeException(e);
+            } finally {
+                Trace.traceEnd(Trace.TRACE_TAG_RESOURCES);
+            }
+        }
+
         ContextImpl context = new ContextImpl(null, mainThread, packageInfo, activityToken, null,
-                0);
+                0, classLoader);
 
         // Clamp display ID to DEFAULT_DISPLAY if it is INVALID_DISPLAY.
         displayId = (displayId != Display.INVALID_DISPLAY) ? displayId : Display.DEFAULT_DISPLAY;
@@ -2117,20 +2178,21 @@
         // will be rebased upon.
         context.mResources = resourcesManager.createBaseActivityResources(activityToken,
                 packageInfo.getResDir(),
-                packageInfo.getSplitResDirs(),
+                splitDirs,
                 packageInfo.getOverlayDirs(),
-                packageInfo.getApplicationInfo().sharedLibraryFiles,
+                packageInfo.getSharedLibraries(),
                 displayId,
                 overrideConfiguration,
                 compatInfo,
-                packageInfo.getClassLoader());
+                classLoader);
         context.mDisplay = resourcesManager.getAdjustedDisplay(displayId,
                 context.mResources.getDisplayAdjustments());
         return context;
     }
 
     private ContextImpl(ContextImpl container, ActivityThread mainThread,
-            LoadedApk packageInfo, IBinder activityToken, UserHandle user, int flags) {
+            LoadedApk packageInfo, IBinder activityToken, UserHandle user, int flags,
+            ClassLoader classLoader) {
         mOuterContext = this;
 
         // If creator didn't specify which storage to use, use the default
@@ -2155,6 +2217,7 @@
         mUser = user;
 
         mPackageInfo = packageInfo;
+        mClassLoader = classLoader;
         mResourcesManager = ResourcesManager.getInstance();
 
         if (container != null) {
diff --git a/core/java/android/app/LoadedApk.java b/core/java/android/app/LoadedApk.java
index 4ab0743..17f5edd 100644
--- a/core/java/android/app/LoadedApk.java
+++ b/core/java/android/app/LoadedApk.java
@@ -27,9 +27,11 @@
 import android.content.pm.ApplicationInfo;
 import android.content.pm.IPackageManager;
 import android.content.pm.PackageManager;
+import android.content.pm.split.SplitDependencyLoaderHelper;
 import android.content.res.AssetManager;
 import android.content.res.CompatibilityInfo;
 import android.content.res.Resources;
+import android.os.Build;
 import android.os.Bundle;
 import android.os.Environment;
 import android.os.FileUtils;
@@ -41,23 +43,22 @@
 import android.os.SystemProperties;
 import android.os.Trace;
 import android.os.UserHandle;
-import android.system.Os;
-import android.system.OsConstants;
-import android.system.ErrnoException;
 import android.text.TextUtils;
 import android.util.AndroidRuntimeException;
 import android.util.ArrayMap;
 import android.util.Log;
 import android.util.Slog;
 import android.util.SparseArray;
+import android.util.SparseIntArray;
 import android.view.Display;
 import android.view.DisplayAdjustments;
 
+import com.android.internal.util.ArrayUtils;
+
 import dalvik.system.BaseDexClassLoader;
 import dalvik.system.VMRuntime;
 
 import java.io.File;
-import java.io.FileDescriptor;
 import java.io.IOException;
 import java.io.InputStream;
 import java.lang.ref.WeakReference;
@@ -65,13 +66,12 @@
 import java.lang.reflect.Method;
 import java.net.URL;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.Enumeration;
 import java.util.List;
 import java.util.Objects;
 
-import libcore.io.IoUtils;
-
 final class IntentReceiverLeaked extends AndroidRuntimeException {
     public IntentReceiverLeaked(String msg) {
         super(msg);
@@ -97,8 +97,6 @@
     private ApplicationInfo mApplicationInfo;
     private String mAppDir;
     private String mResDir;
-    private String[] mSplitAppDirs;
-    private String[] mSplitResDirs;
     private String[] mOverlayDirs;
     private String[] mSharedLibraries;
     private String mDataDir;
@@ -116,14 +114,18 @@
     private ClassLoader mClassLoader;
     private Application mApplication;
 
+    private String[] mSplitNames;
+    private String[] mSplitAppDirs;
+    private String[] mSplitResDirs;
+
     private final ArrayMap<Context, ArrayMap<BroadcastReceiver, ReceiverDispatcher>> mReceivers
-        = new ArrayMap<Context, ArrayMap<BroadcastReceiver, LoadedApk.ReceiverDispatcher>>();
+        = new ArrayMap<>();
     private final ArrayMap<Context, ArrayMap<BroadcastReceiver, LoadedApk.ReceiverDispatcher>> mUnregisteredReceivers
-        = new ArrayMap<Context, ArrayMap<BroadcastReceiver, LoadedApk.ReceiverDispatcher>>();
+        = new ArrayMap<>();
     private final ArrayMap<Context, ArrayMap<ServiceConnection, LoadedApk.ServiceDispatcher>> mServices
-        = new ArrayMap<Context, ArrayMap<ServiceConnection, LoadedApk.ServiceDispatcher>>();
+        = new ArrayMap<>();
     private final ArrayMap<Context, ArrayMap<ServiceConnection, LoadedApk.ServiceDispatcher>> mUnboundServices
-        = new ArrayMap<Context, ArrayMap<ServiceConnection, LoadedApk.ServiceDispatcher>>();
+        = new ArrayMap<>();
 
     int mClientCount = 0;
 
@@ -300,9 +302,18 @@
         synchronized (this) {
             createOrUpdateClassLoaderLocked(addedPaths);
             if (mResources != null) {
-                mResources = mActivityThread.getTopLevelResources(mResDir, mSplitResDirs,
-                        mOverlayDirs, mApplicationInfo.sharedLibraryFiles, Display.DEFAULT_DISPLAY,
-                        this);
+                final String[] splitPaths;
+                try {
+                    splitPaths = getSplitPaths(null);
+                } catch (PackageManager.NameNotFoundException e) {
+                    // This should NEVER fail.
+                    throw new AssertionError("null split not found");
+                }
+
+                mResources = ResourcesManager.getInstance().getResources(null, mResDir,
+                        splitPaths, mOverlayDirs, mSharedLibraries,
+                        Display.DEFAULT_DISPLAY, null, getCompatibilityInfo(),
+                        getClassLoader());
             }
         }
     }
@@ -313,8 +324,6 @@
         mApplicationInfo = aInfo;
         mAppDir = aInfo.sourceDir;
         mResDir = aInfo.uid == myUid ? aInfo.sourceDir : aInfo.publicSourceDir;
-        mSplitAppDirs = aInfo.splitSourceDirs;
-        mSplitResDirs = aInfo.uid == myUid ? aInfo.splitSourceDirs : aInfo.splitPublicSourceDirs;
         mOverlayDirs = aInfo.resourceDirs;
         mSharedLibraries = aInfo.sharedLibraryFiles;
         mDataDir = aInfo.dataDir;
@@ -322,19 +331,28 @@
         mDataDirFile = FileUtils.newFileOrNull(aInfo.dataDir);
         mDeviceProtectedDataDirFile = FileUtils.newFileOrNull(aInfo.deviceProtectedDataDir);
         mCredentialProtectedDataDirFile = FileUtils.newFileOrNull(aInfo.credentialProtectedDataDir);
+
+        mSplitNames = aInfo.splitNames;
+        mSplitAppDirs = aInfo.splitSourceDirs;
+        mSplitResDirs = aInfo.uid == myUid ? aInfo.splitSourceDirs : aInfo.splitPublicSourceDirs;
+
+        if (aInfo.requestsIsolatedSplitLoading() && !ArrayUtils.isEmpty(mSplitNames)) {
+            mSplitLoader = new SplitDependencyLoader(aInfo.splitDependencies);
+        }
     }
 
     public static void makePaths(ActivityThread activityThread, ApplicationInfo aInfo,
             List<String> outZipPaths, List<String> outLibPaths) {
         final String appDir = aInfo.sourceDir;
-        final String[] splitAppDirs = aInfo.splitSourceDirs;
         final String libDir = aInfo.nativeLibraryDir;
         final String[] sharedLibraries = aInfo.sharedLibraryFiles;
 
         outZipPaths.clear();
         outZipPaths.add(appDir);
-        if (splitAppDirs != null) {
-            Collections.addAll(outZipPaths, splitAppDirs);
+
+        // Do not load all available splits if the app requested isolated split loading.
+        if (aInfo.splitSourceDirs != null && !aInfo.requestsIsolatedSplitLoading()) {
+            Collections.addAll(outZipPaths, aInfo.splitSourceDirs);
         }
 
         if (outLibPaths != null) {
@@ -367,13 +385,18 @@
                     || appDir.equals(instrumentedAppDir)) {
                 outZipPaths.clear();
                 outZipPaths.add(instrumentationAppDir);
-                if (instrumentationSplitAppDirs != null) {
-                    Collections.addAll(outZipPaths, instrumentationSplitAppDirs);
-                }
-                if (!instrumentationAppDir.equals(instrumentedAppDir)) {
-                    outZipPaths.add(instrumentedAppDir);
-                    if (instrumentedSplitAppDirs != null) {
-                        Collections.addAll(outZipPaths, instrumentedSplitAppDirs);
+
+                // Only add splits if the app did not request isolated split loading.
+                if (!aInfo.requestsIsolatedSplitLoading()) {
+                    if (instrumentationSplitAppDirs != null) {
+                        Collections.addAll(outZipPaths, instrumentationSplitAppDirs);
+                    }
+
+                    if (!instrumentationAppDir.equals(instrumentedAppDir)) {
+                        outZipPaths.add(instrumentedAppDir);
+                        if (instrumentedSplitAppDirs != null) {
+                            Collections.addAll(outZipPaths, instrumentedSplitAppDirs);
+                        }
                     }
                 }
 
@@ -399,7 +422,7 @@
             // will be added to zipPaths that shouldn't be part of the library path.
             if (aInfo.primaryCpuAbi != null) {
                 // Add fake libs into the library search path if we target prior to N.
-                if (aInfo.targetSdkVersion <= 23) {
+                if (aInfo.targetSdkVersion < Build.VERSION_CODES.N) {
                     outLibPaths.add("/system/fake-libs" +
                         (VMRuntime.is64BitAbi(aInfo.primaryCpuAbi) ? "64" : ""));
                 }
@@ -434,6 +457,116 @@
         }
     }
 
+    private class SplitDependencyLoader
+            extends SplitDependencyLoaderHelper<PackageManager.NameNotFoundException> {
+        private String[] mCachedBaseResourcePath;
+        private final String[][] mCachedResourcePaths;
+        private final ClassLoader[] mCachedSplitClassLoaders;
+
+        SplitDependencyLoader(SparseIntArray dependencies) {
+            super(dependencies);
+            mCachedResourcePaths = new String[mSplitNames.length][];
+            mCachedSplitClassLoaders = new ClassLoader[mSplitNames.length];
+        }
+
+        @Override
+        protected boolean isSplitCached(int splitIdx) {
+            if (splitIdx != -1) {
+                return mCachedSplitClassLoaders[splitIdx] != null;
+            }
+            return mClassLoader != null && mCachedBaseResourcePath != null;
+        }
+
+        private void addAllConfigSplits(String splitName, ArrayList<String> outAssetPaths) {
+            for (int i = 0; i < mSplitNames.length; i++) {
+                if (isConfigurationSplitOf(mSplitNames[i], splitName)) {
+                    outAssetPaths.add(mSplitResDirs[i]);
+                }
+            }
+        }
+
+        @Override
+        protected void constructSplit(int splitIdx, int parentSplitIdx) throws
+                PackageManager.NameNotFoundException {
+            final ArrayList<String> splitPaths = new ArrayList<>();
+            if (splitIdx == -1) {
+                createOrUpdateClassLoaderLocked(null);
+                addAllConfigSplits(null, splitPaths);
+                mCachedBaseResourcePath = splitPaths.toArray(new String[splitPaths.size()]);
+                return;
+            }
+
+            final ClassLoader parent;
+            if (parentSplitIdx == -1) {
+                // The parent is the base APK, so use its ClassLoader as parent
+                // and its configuration splits as part of our own too.
+                parent = mClassLoader;
+                Collections.addAll(splitPaths, mCachedBaseResourcePath);
+            } else {
+                parent = mCachedSplitClassLoaders[parentSplitIdx];
+                Collections.addAll(splitPaths, mCachedResourcePaths[parentSplitIdx]);
+            }
+
+            mCachedSplitClassLoaders[splitIdx] = ApplicationLoaders.getDefault().getClassLoader(
+                    mSplitAppDirs[splitIdx], getTargetSdkVersion(), false, null, null, parent);
+
+            splitPaths.add(mSplitResDirs[splitIdx]);
+            addAllConfigSplits(mSplitNames[splitIdx], splitPaths);
+            mCachedResourcePaths[splitIdx] = splitPaths.toArray(new String[splitPaths.size()]);
+        }
+
+        private int ensureSplitLoaded(String splitName)
+                throws PackageManager.NameNotFoundException {
+            final int idx;
+            if (splitName == null) {
+                idx = -1;
+            } else {
+                idx = Arrays.binarySearch(mSplitNames, splitName);
+                if (idx < 0) {
+                    throw new PackageManager.NameNotFoundException(
+                            "Split name '" + splitName + "' is not installed");
+                }
+            }
+
+            loadDependenciesForSplit(idx);
+            return idx;
+        }
+
+        ClassLoader getClassLoaderForSplit(String splitName)
+                throws PackageManager.NameNotFoundException {
+            final int idx = ensureSplitLoaded(splitName);
+            if (idx < 0) {
+                return mClassLoader;
+            }
+            return mCachedSplitClassLoaders[idx];
+        }
+
+        String[] getSplitPathsForSplit(String splitName)
+                throws PackageManager.NameNotFoundException {
+            final int idx = ensureSplitLoaded(splitName);
+            if (idx < 0) {
+                return mCachedBaseResourcePath;
+            }
+            return mCachedResourcePaths[idx];
+        }
+    }
+
+    private SplitDependencyLoader mSplitLoader;
+
+    ClassLoader getSplitClassLoader(String splitName) throws PackageManager.NameNotFoundException {
+        if (mSplitLoader == null) {
+            return mClassLoader;
+        }
+        return mSplitLoader.getClassLoaderForSplit(splitName);
+    }
+
+    String[] getSplitPaths(String splitName) throws PackageManager.NameNotFoundException {
+        if (mSplitLoader == null) {
+            return mSplitResDirs;
+        }
+        return mSplitLoader.getSplitPathsForSplit(splitName);
+    }
+
     private void createOrUpdateClassLoaderLocked(List<String> addedPaths) {
         if (mPackageName.equals("android")) {
             // Note: This branch is taken for system server and we don't need to setup
@@ -790,6 +923,10 @@
         return mOverlayDirs;
     }
 
+    public String[] getSharedLibraries() {
+        return mSharedLibraries;
+    }
+
     public String getDataDir() {
         return mDataDir;
     }
@@ -806,14 +943,24 @@
         return mCredentialProtectedDataDirFile;
     }
 
-    public AssetManager getAssets(ActivityThread mainThread) {
-        return getResources(mainThread).getAssets();
+    public AssetManager getAssets() {
+        return getResources().getAssets();
     }
 
-    public Resources getResources(ActivityThread mainThread) {
+    public Resources getResources() {
         if (mResources == null) {
-            mResources = mainThread.getTopLevelResources(mResDir, mSplitResDirs, mOverlayDirs,
-                    mApplicationInfo.sharedLibraryFiles, Display.DEFAULT_DISPLAY, this);
+            final String[] splitPaths;
+            try {
+                splitPaths = getSplitPaths(null);
+            } catch (PackageManager.NameNotFoundException e) {
+                // This should never fail.
+                throw new AssertionError("null split not found");
+            }
+
+            mResources = ResourcesManager.getInstance().getResources(null, mResDir,
+                    splitPaths, mOverlayDirs, mSharedLibraries,
+                    Display.DEFAULT_DISPLAY, null, getCompatibilityInfo(),
+                    getClassLoader());
         }
         return mResources;
     }
@@ -870,8 +1017,7 @@
         }
 
         // Rewrite the R 'constants' for all library apks.
-        SparseArray<String> packageIdentifiers = getAssets(mActivityThread)
-                .getAssignedPackageIdentifiers();
+        SparseArray<String> packageIdentifiers = getAssets().getAssignedPackageIdentifiers();
         final int N = packageIdentifiers.size();
         for (int i = 0; i < N; i++) {
             final int id = packageIdentifiers.keyAt(i);
diff --git a/core/java/android/content/Context.java b/core/java/android/content/Context.java
index 38e6fbe..f00f605 100644
--- a/core/java/android/content/Context.java
+++ b/core/java/android/content/Context.java
@@ -4253,6 +4253,20 @@
             int flags) throws PackageManager.NameNotFoundException;
 
     /**
+     * Return a new Context object for the given split name. The new Context has a ClassLoader and
+     * Resources object that can access the split's and all of its dependencies' code/resources.
+     * Each call to this method returns a new instance of a Context object;
+     * Context objects are not shared, however common state (ClassLoader, other Resources for
+     * the same split) may be so the Context itself can be fairly lightweight.
+     *
+     * @param splitName The name of the split to include, as declared in the split's
+     *                  <code>AndroidManifest.xml</code>.
+     * @return A {@link Context} with the given split's code and/or resources loaded.
+     */
+    public abstract Context createContextForSplit(String splitName)
+            throws PackageManager.NameNotFoundException;
+
+    /**
      * Get the userId associated with this context
      * @return user id
      *
diff --git a/core/java/android/content/ContextWrapper.java b/core/java/android/content/ContextWrapper.java
index b131ecc..546bfc4 100644
--- a/core/java/android/content/ContextWrapper.java
+++ b/core/java/android/content/ContextWrapper.java
@@ -16,7 +16,6 @@
 
 package android.content;
 
-import android.annotation.Nullable;
 import android.annotation.SystemApi;
 import android.app.IApplicationThread;
 import android.app.IServiceConnection;
@@ -826,6 +825,13 @@
 
     /** @hide */
     @Override
+    public Context createContextForSplit(String splitName)
+            throws PackageManager.NameNotFoundException {
+        return mBase.createContextForSplit(splitName);
+    }
+
+    /** @hide */
+    @Override
     public int getUserId() {
         return mBase.getUserId();
     }
diff --git a/core/java/android/content/pm/ApplicationInfo.java b/core/java/android/content/pm/ApplicationInfo.java
index 04ab239..3d9ba96 100644
--- a/core/java/android/content/pm/ApplicationInfo.java
+++ b/core/java/android/content/pm/ApplicationInfo.java
@@ -31,6 +31,7 @@
 import android.os.UserHandle;
 import android.text.TextUtils;
 import android.util.Printer;
+import android.util.SparseIntArray;
 
 import com.android.internal.util.ArrayUtils;
 
@@ -558,6 +559,14 @@
     public static final int PRIVATE_FLAG_STATIC_SHARED_LIBRARY = 1 << 13;
 
     /**
+     * Value for {@linl #privateFlags}: When set, the application will only have its splits loaded
+     * if they are required to load a component. Splits can be loaded on demand using the
+     * {@link Context#createContextForSplit(String)} API.
+     * @hide
+     */
+    public static final int PRIVATE_FLAG_ISOLATED_SPLIT_LOADING = 1 << 14;
+
+    /**
      * Private/hidden flags. See {@code PRIVATE_FLAG_...} constants.
      * {@hide}
      */
@@ -607,8 +616,12 @@
     public String publicSourceDir;
 
     /**
-     * Full paths to zero or more split APKs that, when combined with the base
-     * APK defined in {@link #sourceDir}, form a complete application.
+     * The names of all installed split APKs, ordered lexicographically.
+     */
+    public String[] splitNames;
+
+    /**
+     * Full paths to zero or more split APKs, indexed by the same order as {@link #splitNames}.
      */
     public String[] splitSourceDirs;
 
@@ -616,14 +629,35 @@
      * Full path to the publicly available parts of {@link #splitSourceDirs},
      * including resources and manifest. This may be different from
      * {@link #splitSourceDirs} if an application is forward locked.
+     *
+     * @see #splitSourceDirs
      */
     public String[] splitPublicSourceDirs;
 
     /**
-     * Full paths to the locations of extra resource packages this application
-     * uses. This field is only used if there are extra resource packages,
-     * otherwise it is null.
-     * 
+     * Maps the dependencies between split APKs. All splits implicitly depend on the base APK.
+     *
+     * Available since platform version O.
+     *
+     * Only populated if the application opts in to isolated split loading via the
+     * {@link android.R.attr.isolatedSplits} attribute in the &lt;manifest&gt; tag of the app's
+     * AndroidManifest.xml.
+     *
+     * The keys and values are all indices into the {@link #splitNames}, {@link #splitSourceDirs},
+     * and {@link #splitPublicSourceDirs} arrays.
+     * Each key represents a split and its value is its parent split.
+     * Cycles do not exist because they are illegal and screened for during installation.
+     *
+     * May be null if no splits are installed, or if no dependencies exist between them.
+     * @hide
+     */
+    public SparseIntArray splitDependencies;
+
+    /**
+     * Full paths to the locations of extra resource packages (runtime overlays)
+     * this application uses. This field is only used if there are extra resource
+     * packages, otherwise it is null.
+     *
      * {@hide}
      */
     public String[] resourceDirs;
@@ -1058,8 +1092,10 @@
         scanPublicSourceDir = orig.scanPublicSourceDir;
         sourceDir = orig.sourceDir;
         publicSourceDir = orig.publicSourceDir;
+        splitNames = orig.splitNames;
         splitSourceDirs = orig.splitSourceDirs;
         splitPublicSourceDirs = orig.splitPublicSourceDirs;
+        splitDependencies = orig.splitDependencies;
         nativeLibraryDir = orig.nativeLibraryDir;
         secondaryNativeLibraryDir = orig.secondaryNativeLibraryDir;
         nativeLibraryRootDir = orig.nativeLibraryRootDir;
@@ -1098,6 +1134,7 @@
         return 0;
     }
 
+    @SuppressWarnings("unchecked")
     public void writeToParcel(Parcel dest, int parcelableFlags) {
         super.writeToParcel(dest, parcelableFlags);
         dest.writeString(taskAffinity);
@@ -1115,8 +1152,10 @@
         dest.writeString(scanPublicSourceDir);
         dest.writeString(sourceDir);
         dest.writeString(publicSourceDir);
+        dest.writeStringArray(splitNames);
         dest.writeStringArray(splitSourceDirs);
         dest.writeStringArray(splitPublicSourceDirs);
+        dest.writeSparseIntArray(splitDependencies);
         dest.writeString(nativeLibraryDir);
         dest.writeString(secondaryNativeLibraryDir);
         dest.writeString(nativeLibraryRootDir);
@@ -1155,6 +1194,7 @@
         }
     };
 
+    @SuppressWarnings("unchecked")
     private ApplicationInfo(Parcel source) {
         super(source);
         taskAffinity = source.readString();
@@ -1172,8 +1212,10 @@
         scanPublicSourceDir = source.readString();
         sourceDir = source.readString();
         publicSourceDir = source.readString();
+        splitNames = source.readStringArray();
         splitSourceDirs = source.readStringArray();
         splitPublicSourceDirs = source.readStringArray();
+        splitDependencies = source.readSparseIntArray();
         nativeLibraryDir = source.readString();
         secondaryNativeLibraryDir = source.readString();
         nativeLibraryRootDir = source.readString();
@@ -1363,6 +1405,15 @@
     }
 
     /**
+     * Returns true if the app has declared in its manifest that it wants its split APKs to be
+     * loaded into isolated Contexts, with their own ClassLoaders and Resources objects.
+     * @hide
+     */
+    public boolean requestsIsolatedSplitLoading() {
+        return (privateFlags & ApplicationInfo.PRIVATE_FLAG_ISOLATED_SPLIT_LOADING) != 0;
+    }
+
+    /**
      * @hide
      */
     public boolean isStaticSharedLibrary() {
diff --git a/core/java/android/content/pm/ComponentInfo.java b/core/java/android/content/pm/ComponentInfo.java
index b091d7e..53be953 100644
--- a/core/java/android/content/pm/ComponentInfo.java
+++ b/core/java/android/content/pm/ComponentInfo.java
@@ -45,6 +45,12 @@
     public String processName;
 
     /**
+     * The name of the split in which this component is declared.
+     * Null if the component was declared in the base APK.
+     */
+    public String splitName;
+
+    /**
      * A string resource identifier (in the package's resources) containing
      * a user-readable description of the component.  From the "description"
      * attribute or, if not set, 0.
@@ -53,7 +59,7 @@
     
     /**
      * Indicates whether or not this component may be instantiated.  Note that this value can be
-     * overriden by the one in its parent {@link ApplicationInfo}.
+     * overridden by the one in its parent {@link ApplicationInfo}.
      */
     public boolean enabled = true;
 
@@ -72,11 +78,6 @@
      */
     public boolean directBootAware = false;
 
-    /**
-     * The name of the split that contains the code for this component.
-     */
-    public String splitName;
-
     /** @removed */
     @Deprecated
     public boolean encryptionAware = false;
@@ -88,6 +89,7 @@
         super(orig);
         applicationInfo = orig.applicationInfo;
         processName = orig.processName;
+        splitName = orig.splitName;
         descriptionRes = orig.descriptionRes;
         enabled = orig.enabled;
         exported = orig.exported;
@@ -168,6 +170,9 @@
         if (processName != null && !packageName.equals(processName)) {
             pw.println(prefix + "processName=" + processName);
         }
+        if (splitName != null) {
+            pw.println(prefix + "splitName=" + splitName);
+        }
         pw.println(prefix + "enabled=" + enabled + " exported=" + exported
                 + " directBootAware=" + directBootAware);
         if (descriptionRes != 0) {
@@ -200,6 +205,7 @@
             applicationInfo.writeToParcel(dest, parcelableFlags);
         }
         dest.writeString(processName);
+        dest.writeString(splitName);
         dest.writeInt(descriptionRes);
         dest.writeInt(enabled ? 1 : 0);
         dest.writeInt(exported ? 1 : 0);
@@ -213,6 +219,7 @@
             applicationInfo = ApplicationInfo.CREATOR.createFromParcel(source);
         }
         processName = source.readString();
+        splitName = source.readString();
         descriptionRes = source.readInt();
         enabled = (source.readInt() != 0);
         exported = (source.readInt() != 0);
diff --git a/core/java/android/content/pm/InstrumentationInfo.java b/core/java/android/content/pm/InstrumentationInfo.java
index 9d88cdd..a135d8f 100644
--- a/core/java/android/content/pm/InstrumentationInfo.java
+++ b/core/java/android/content/pm/InstrumentationInfo.java
@@ -18,6 +18,8 @@
 
 import android.os.Parcel;
 import android.os.Parcelable;
+import android.util.SparseArray;
+import android.util.SparseIntArray;
 
 /**
  * Information you can retrieve about a particular piece of test
@@ -44,8 +46,12 @@
     public String publicSourceDir;
 
     /**
-     * Full paths to zero or more split APKs that, when combined with the base
-     * APK defined in {@link #sourceDir}, form a complete application.
+     * The names of all installed split APKs, ordered lexicographically.
+     */
+    public String[] splitNames;
+
+    /**
+     * Full paths to zero or more split APKs, indexed by the same order as {@link #splitNames}.
      */
     public String[] splitSourceDirs;
 
@@ -53,10 +59,31 @@
      * Full path to the publicly available parts of {@link #splitSourceDirs},
      * including resources and manifest. This may be different from
      * {@link #splitSourceDirs} if an application is forward locked.
+     *
+     * @see #splitSourceDirs
      */
     public String[] splitPublicSourceDirs;
 
     /**
+     * Maps the dependencies between split APKs. All splits implicitly depend on the base APK.
+     *
+     * Available since platform version O.
+     *
+     * Only populated if the application opts in to isolated split loading via the
+     * {@link android.R.attr.isolatedSplits} attribute in the &lt;manifest&gt; tag of the app's
+     * AndroidManifest.xml.
+     *
+     * The keys and values are all indices into the {@link #splitNames}, {@link #splitSourceDirs},
+     * and {@link #splitPublicSourceDirs} arrays.
+     * Each key represents a split and its value is its parent split.
+     * Cycles do not exist because they are illegal and screened for during installation.
+     *
+     * May be null if no splits are installed, or if no dependencies exist between them.
+     * @hide
+     */
+    public SparseIntArray splitDependencies;
+
+    /**
      * Full path to a directory assigned to the package for its persistent data.
      */
     public String dataDir;
@@ -88,8 +115,10 @@
         targetPackage = orig.targetPackage;
         sourceDir = orig.sourceDir;
         publicSourceDir = orig.publicSourceDir;
+        splitNames = orig.splitNames;
         splitSourceDirs = orig.splitSourceDirs;
         splitPublicSourceDirs = orig.splitPublicSourceDirs;
+        splitDependencies = orig.splitDependencies;
         dataDir = orig.dataDir;
         deviceProtectedDataDir = orig.deviceProtectedDataDir;
         credentialProtectedDataDir = orig.credentialProtectedDataDir;
@@ -114,8 +143,10 @@
         dest.writeString(targetPackage);
         dest.writeString(sourceDir);
         dest.writeString(publicSourceDir);
+        dest.writeStringArray(splitNames);
         dest.writeStringArray(splitSourceDirs);
         dest.writeStringArray(splitPublicSourceDirs);
+        dest.writeSparseIntArray(splitDependencies);
         dest.writeString(dataDir);
         dest.writeString(deviceProtectedDataDir);
         dest.writeString(credentialProtectedDataDir);
@@ -135,13 +166,16 @@
         }
     };
 
+    @SuppressWarnings("unchecked")
     private InstrumentationInfo(Parcel source) {
         super(source);
         targetPackage = source.readString();
         sourceDir = source.readString();
         publicSourceDir = source.readString();
+        splitNames = source.readStringArray();
         splitSourceDirs = source.readStringArray();
         splitPublicSourceDirs = source.readStringArray();
+        splitDependencies = source.readSparseIntArray();
         dataDir = source.readString();
         deviceProtectedDataDir = source.readString();
         credentialProtectedDataDir = source.readString();
@@ -156,8 +190,10 @@
         ai.packageName = packageName;
         ai.sourceDir = sourceDir;
         ai.publicSourceDir = publicSourceDir;
+        ai.splitNames = splitNames;
         ai.splitSourceDirs = splitSourceDirs;
         ai.splitPublicSourceDirs = splitPublicSourceDirs;
+        ai.splitDependencies = splitDependencies;
         ai.dataDir = dataDir;
         ai.deviceProtectedDataDir = deviceProtectedDataDir;
         ai.credentialProtectedDataDir = credentialProtectedDataDir;
diff --git a/core/java/android/content/pm/PackageParser.java b/core/java/android/content/pm/PackageParser.java
index cd51bce..8223726 100644
--- a/core/java/android/content/pm/PackageParser.java
+++ b/core/java/android/content/pm/PackageParser.java
@@ -49,6 +49,9 @@
 import android.content.ComponentName;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.content.pm.split.SplitAssetDependencyLoader;
+import android.content.pm.split.SplitAssetLoader;
+import android.content.pm.split.DefaultSplitAssetLoader;
 import android.content.res.AssetManager;
 import android.content.res.Configuration;
 import android.content.res.Resources;
@@ -74,6 +77,7 @@
 import android.util.Log;
 import android.util.Pair;
 import android.util.Slog;
+import android.util.SparseIntArray;
 import android.util.TypedValue;
 import android.util.apk.ApkSignatureSchemeV2Verifier;
 import android.util.jar.StrictJarFile;
@@ -106,6 +110,7 @@
 import java.security.spec.X509EncodedKeySpec;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.BitSet;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.Iterator;
@@ -155,6 +160,7 @@
 
     private static final String TAG_MANIFEST = "manifest";
     private static final String TAG_APPLICATION = "application";
+    private static final String TAG_PACKAGE_VERIFIER = "package-verifier";
     private static final String TAG_OVERLAY = "overlay";
     private static final String TAG_KEY_SETS = "key-sets";
     private static final String TAG_PERMISSION_GROUP = "permission-group";
@@ -178,6 +184,7 @@
     private static final String TAG_EAT_COMMENT = "eat-comment";
     private static final String TAG_PACKAGE = "package";
     private static final String TAG_RESTRICT_UPDATE = "restrict-update";
+    private static final String TAG_USES_SPLIT = "uses-split";
 
     /**
      * Bit mask of all the valid bits that can be set in restartOnConfigChanges.
@@ -352,6 +359,9 @@
         /** Names of any split APKs, ordered by parsed splitName */
         public final String[] splitNames;
 
+        /** Dependencies of any split APKs, ordered by parsed splitName */
+        public final String[] usesSplitNames;
+
         /**
          * Path where this package was found on disk. For monolithic packages
          * this is path to single base APK file; for cluster packages this is
@@ -374,14 +384,17 @@
         public final boolean multiArch;
         public final boolean use32bitAbi;
         public final boolean extractNativeLibs;
+        public final boolean isolatedSplits;
 
         public PackageLite(String codePath, ApkLite baseApk, String[] splitNames,
-                String[] splitCodePaths, int[] splitRevisionCodes) {
+                String[] usesSplitNames, String[] splitCodePaths,
+                int[] splitRevisionCodes) {
             this.packageName = baseApk.packageName;
             this.versionCode = baseApk.versionCode;
             this.installLocation = baseApk.installLocation;
             this.verifiers = baseApk.verifiers;
             this.splitNames = splitNames;
+            this.usesSplitNames = usesSplitNames;
             this.codePath = codePath;
             this.baseCodePath = baseApk.codePath;
             this.splitCodePaths = splitCodePaths;
@@ -392,6 +405,7 @@
             this.multiArch = baseApk.multiArch;
             this.use32bitAbi = baseApk.use32bitAbi;
             this.extractNativeLibs = baseApk.extractNativeLibs;
+            this.isolatedSplits = baseApk.isolatedSplits;
         }
 
         public List<String> getAllCodePaths() {
@@ -411,6 +425,7 @@
         public final String codePath;
         public final String packageName;
         public final String splitName;
+        public final String usesSplitName;
         public final int versionCode;
         public final int revisionCode;
         public final int installLocation;
@@ -422,15 +437,17 @@
         public final boolean multiArch;
         public final boolean use32bitAbi;
         public final boolean extractNativeLibs;
+        public final boolean isolatedSplits;
 
-        public ApkLite(String codePath, String packageName, String splitName, int versionCode,
-                int revisionCode, int installLocation, List<VerifierInfo> verifiers,
+        public ApkLite(String codePath, String packageName, String splitName, String usesSplitName,
+                int versionCode, int revisionCode, int installLocation, List<VerifierInfo> verifiers,
                 Signature[] signatures, Certificate[][] certificates, boolean coreApp,
                 boolean debuggable, boolean multiArch, boolean use32bitAbi,
-                boolean extractNativeLibs) {
+                boolean extractNativeLibs, boolean isolatedSplits) {
             this.codePath = codePath;
             this.packageName = packageName;
             this.splitName = splitName;
+            this.usesSplitName = usesSplitName;
             this.versionCode = versionCode;
             this.revisionCode = revisionCode;
             this.installLocation = installLocation;
@@ -442,6 +459,7 @@
             this.multiArch = multiArch;
             this.use32bitAbi = use32bitAbi;
             this.extractNativeLibs = extractNativeLibs;
+            this.isolatedSplits = isolatedSplits;
         }
     }
 
@@ -492,7 +510,7 @@
         return isApkPath(file.getName());
     }
 
-    private static boolean isApkPath(String path) {
+    public static boolean isApkPath(String path) {
         return path.endsWith(".apk");
     }
 
@@ -738,23 +756,23 @@
     public static PackageLite parsePackageLite(File packageFile, int flags)
             throws PackageParserException {
         if (packageFile.isDirectory()) {
-            return parseClusterPackageLite(packageFile, flags, null);
+            return parseClusterPackageLite(packageFile, flags);
         } else {
-            return parseMonolithicPackageLite(packageFile, flags, null);
+            return parseMonolithicPackageLite(packageFile, flags);
         }
     }
 
-    private static PackageLite parseMonolithicPackageLite(File packageFile, int flags,
-            AssetManager cachedAssetManager) throws PackageParserException {
+    private static PackageLite parseMonolithicPackageLite(File packageFile, int flags)
+            throws PackageParserException {
         Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "parseApkLite");
-        final ApkLite baseApk = parseApkLite(packageFile, flags, cachedAssetManager);
+        final ApkLite baseApk = parseApkLite(packageFile, flags);
         final String packagePath = packageFile.getAbsolutePath();
         Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);
-        return new PackageLite(packagePath, baseApk, null, null, null);
+        return new PackageLite(packagePath, baseApk, null, null, null, null);
     }
 
-    private static PackageLite parseClusterPackageLite(File packageDir, int flags,
-            AssetManager cachedAssetManager) throws PackageParserException {
+    private static PackageLite parseClusterPackageLite(File packageDir, int flags)
+            throws PackageParserException {
         final File[] files = packageDir.listFiles();
         if (ArrayUtils.isEmpty(files)) {
             throw new PackageParserException(INSTALL_PARSE_FAILED_NOT_APK,
@@ -768,7 +786,7 @@
         final ArrayMap<String, ApkLite> apks = new ArrayMap<>();
         for (File file : files) {
             if (isApkFile(file)) {
-                final ApkLite lite = parseApkLite(file, flags, cachedAssetManager);
+                final ApkLite lite = parseApkLite(file, flags);
 
                 // Assert that all package names and version codes are
                 // consistent with the first one we encounter.
@@ -808,10 +826,12 @@
         final int size = apks.size();
 
         String[] splitNames = null;
+        String[] usesSplitNames = null;
         String[] splitCodePaths = null;
         int[] splitRevisionCodes = null;
         if (size > 0) {
             splitNames = new String[size];
+            usesSplitNames = new String[size];
             splitCodePaths = new String[size];
             splitRevisionCodes = new int[size];
 
@@ -819,13 +839,15 @@
             Arrays.sort(splitNames, sSplitNameComparator);
 
             for (int i = 0; i < size; i++) {
-                splitCodePaths[i] = apks.get(splitNames[i]).codePath;
-                splitRevisionCodes[i] = apks.get(splitNames[i]).revisionCode;
+                final ApkLite apk = apks.get(splitNames[i]);
+                usesSplitNames[i] = apk.usesSplitName;
+                splitCodePaths[i] = apk.codePath;
+                splitRevisionCodes[i] = apk.revisionCode;
             }
         }
 
         final String codePath = packageDir.getAbsolutePath();
-        return new PackageLite(codePath, baseApk, splitNames, splitCodePaths,
+        return new PackageLite(codePath, baseApk, splitNames, usesSplitNames, splitCodePaths,
                 splitRevisionCodes);
     }
 
@@ -1004,6 +1026,42 @@
         }
     }
 
+    private static SparseIntArray buildSplitDependencyTree(PackageLite pkg)
+            throws PackageParserException {
+        SparseIntArray splitDependencies = new SparseIntArray();
+        for (int splitIdx = 0; splitIdx < pkg.splitNames.length; splitIdx++) {
+            final String splitDependency = pkg.usesSplitNames[splitIdx];
+            if (splitDependency != null) {
+                final int depIdx = Arrays.binarySearch(pkg.splitNames, splitDependency);
+                if (depIdx < 0) {
+                    throw new PackageParserException(
+                            PackageManager.INSTALL_PARSE_FAILED_BAD_MANIFEST,
+                            "Split '" + pkg.splitNames[splitIdx] + "' requires split '"
+                                    + splitDependency + "', which is missing.");
+                }
+                splitDependencies.put(splitIdx, depIdx);
+            }
+        }
+
+        // Verify that there are no cycles.
+        final BitSet bitset = new BitSet();
+        for (int i = 0; i < splitDependencies.size(); i++) {
+            int splitIdx = splitDependencies.keyAt(i);
+
+            bitset.clear();
+            while (splitIdx != -1) {
+                if (bitset.get(splitIdx)) {
+                    throw new PackageParserException(
+                            PackageManager.INSTALL_PARSE_FAILED_BAD_MANIFEST,
+                            "Cycle detected in split dependencies.");
+                }
+                bitset.set(splitIdx);
+                splitIdx = splitDependencies.get(splitIdx, -1);
+            }
+        }
+        return splitDependencies.size() != 0 ? splitDependencies : null;
+    }
+
     /**
      * Parse all APKs contained in the given directory, treating them as a
      * single package. This also performs sanity checking, such as requiring
@@ -1014,25 +1072,24 @@
      * must be done separately in {@link #collectCertificates(Package, int)}.
      */
     private Package parseClusterPackage(File packageDir, int flags) throws PackageParserException {
-        final AssetManager assets = newConfiguredAssetManager();
-        final PackageLite lite = parseClusterPackageLite(packageDir, 0, assets);
-
+        final PackageLite lite = parseClusterPackageLite(packageDir, 0);
         if (mOnlyCoreApps && !lite.coreApp) {
             throw new PackageParserException(INSTALL_PARSE_FAILED_MANIFEST_MALFORMED,
                     "Not a coreApp: " + packageDir);
         }
 
+        // Build the split dependency tree.
+        SparseIntArray splitDependencies = null;
+        final SplitAssetLoader assetLoader;
+        if (lite.isolatedSplits && !ArrayUtils.isEmpty(lite.splitNames)) {
+            splitDependencies = buildSplitDependencyTree(lite);
+            assetLoader = new SplitAssetDependencyLoader(lite, splitDependencies, flags);
+        } else {
+            assetLoader = new DefaultSplitAssetLoader(lite, flags);
+        }
+
         try {
-            // Load all splits into the AssetManager (base has already been loaded earlier)
-            // so that resources can be overriden when parsing the manifests.
-            loadApkIntoAssetManager(assets, lite.baseCodePath, flags);
-
-            if (!ArrayUtils.isEmpty(lite.splitCodePaths)) {
-                for (String path : lite.splitCodePaths) {
-                    loadApkIntoAssetManager(assets, path, flags);
-                }
-            }
-
+            final AssetManager assets = assetLoader.getBaseAssetManager();
             final File baseApk = new File(lite.baseCodePath);
             final Package pkg = parseBaseApk(baseApk, assets, flags);
             if (pkg == null) {
@@ -1047,9 +1104,12 @@
                 pkg.splitRevisionCodes = lite.splitRevisionCodes;
                 pkg.splitFlags = new int[num];
                 pkg.splitPrivateFlags = new int[num];
+                pkg.applicationInfo.splitNames = pkg.splitNames;
+                pkg.applicationInfo.splitDependencies = splitDependencies;
 
                 for (int i = 0; i < num; i++) {
-                    parseSplitApk(pkg, i, assets, flags);
+                    final AssetManager splitAssets = assetLoader.getSplitAssetManager(i);
+                    parseSplitApk(pkg, i, splitAssets, flags);
                 }
             }
 
@@ -1057,7 +1117,7 @@
             pkg.setUse32bitAbi(lite.use32bitAbi);
             return pkg;
         } finally {
-            IoUtils.closeQuietly(assets);
+            IoUtils.closeQuietly(assetLoader);
         }
     }
 
@@ -1074,7 +1134,7 @@
     @Deprecated
     public Package parseMonolithicPackage(File apkFile, int flags) throws PackageParserException {
         final AssetManager assets = newConfiguredAssetManager();
-        final PackageLite lite = parseMonolithicPackageLite(apkFile, flags, assets);
+        final PackageLite lite = parseMonolithicPackageLite(apkFile, flags);
         if (mOnlyCoreApps) {
             if (!lite.coreApp) {
                 throw new PackageParserException(INSTALL_PARSE_FAILED_MANIFEST_MALFORMED,
@@ -1168,7 +1228,7 @@
 
         final int cookie = loadApkIntoAssetManager(assets, apkPath, flags);
 
-        Resources res = null;
+        final Resources res;
         XmlResourceParser parser = null;
         try {
             res = new Resources(assets, mMetrics, null);
@@ -1225,7 +1285,7 @@
             }
 
             String tagName = parser.getName();
-            if (tagName.equals("application")) {
+            if (tagName.equals(TAG_APPLICATION)) {
                 if (foundApp) {
                     if (RIGID_PARSER) {
                         outError[0] = "<manifest> has more than one <application>";
@@ -1523,17 +1583,12 @@
      */
     public static ApkLite parseApkLite(File apkFile, int flags)
             throws PackageParserException {
-        return parseApkLite(apkFile, flags, null);
-    }
-
-    private static ApkLite parseApkLite(File apkFile, int flags,
-            @Nullable AssetManager cachedAssetManager) throws PackageParserException {
         final String apkPath = apkFile.getAbsolutePath();
 
         AssetManager assets = null;
         XmlResourceParser parser = null;
         try {
-            assets = cachedAssetManager == null ? newConfiguredAssetManager() : cachedAssetManager;
+            assets = newConfiguredAssetManager();
             int cookie = assets.addAssetPath(apkPath);
             if (cookie == 0) {
                 throw new PackageParserException(INSTALL_PARSE_FAILED_NOT_APK,
@@ -1543,7 +1598,6 @@
             final DisplayMetrics metrics = new DisplayMetrics();
             metrics.setToDefaults();
 
-            final Resources res = new Resources(assets, metrics, null);
             parser = assets.openXmlResourceParser(cookie, ANDROID_MANIFEST_FILENAME);
 
             final Signature[] signatures;
@@ -1565,16 +1619,14 @@
             }
 
             final AttributeSet attrs = parser;
-            return parseApkLite(apkPath, res, parser, attrs, flags, signatures, certificates);
+            return parseApkLite(apkPath, parser, attrs, flags, signatures, certificates);
 
         } catch (XmlPullParserException | IOException | RuntimeException e) {
             throw new PackageParserException(INSTALL_PARSE_FAILED_UNEXPECTED_EXCEPTION,
                     "Failed to parse " + apkPath, e);
         } finally {
             IoUtils.closeQuietly(parser);
-            if (cachedAssetManager == null) {
-                IoUtils.closeQuietly(assets);
-            }
+            IoUtils.closeQuietly(assets);
         }
     }
 
@@ -1652,9 +1704,9 @@
                 (splitName != null) ? splitName.intern() : splitName);
     }
 
-    private static ApkLite parseApkLite(String codePath, Resources res, XmlPullParser parser,
-            AttributeSet attrs, int flags, Signature[] signatures, Certificate[][] certificates)
-                    throws IOException, XmlPullParserException, PackageParserException {
+    private static ApkLite parseApkLite(String codePath, XmlPullParser parser, AttributeSet attrs,
+            int flags, Signature[] signatures, Certificate[][] certificates)
+            throws IOException, XmlPullParserException, PackageParserException {
         final Pair<String, String> packageSplit = parsePackageSplitNames(parser, attrs);
 
         int installLocation = PARSE_DEFAULT_INSTALL_LOCATION;
@@ -1665,6 +1717,8 @@
         boolean multiArch = false;
         boolean use32bitAbi = false;
         boolean extractNativeLibs = true;
+        boolean isolatedSplits = false;
+        String usesSplitName = null;
 
         for (int i = 0; i < attrs.getAttributeCount(); i++) {
             final String attr = attrs.getAttributeName(i);
@@ -1677,6 +1731,8 @@
                 revisionCode = attrs.getAttributeIntValue(i, 0);
             } else if (attr.equals("coreApp")) {
                 coreApp = attrs.getAttributeBooleanValue(i, false);
+            } else if (attr.equals("isolatedSplits")) {
+                isolatedSplits = attrs.getAttributeBooleanValue(i, false);
             }
         }
 
@@ -1691,14 +1747,16 @@
                 continue;
             }
 
-            if (parser.getDepth() == searchDepth && "package-verifier".equals(parser.getName())) {
-                final VerifierInfo verifier = parseVerifier(res, parser, attrs, flags);
+            if (parser.getDepth() != searchDepth) {
+                continue;
+            }
+
+            if (TAG_PACKAGE_VERIFIER.equals(parser.getName())) {
+                final VerifierInfo verifier = parseVerifier(attrs);
                 if (verifier != null) {
                     verifiers.add(verifier);
                 }
-            }
-
-            if (parser.getDepth() == searchDepth && "application".equals(parser.getName())) {
+            } else if (TAG_APPLICATION.equals(parser.getName())) {
                 for (int i = 0; i < attrs.getAttributeCount(); ++i) {
                     final String attr = attrs.getAttributeName(i);
                     if ("debuggable".equals(attr)) {
@@ -1714,12 +1772,25 @@
                         extractNativeLibs = attrs.getAttributeBooleanValue(i, true);
                     }
                 }
+            } else if (TAG_USES_SPLIT.equals(parser.getName())) {
+                if (usesSplitName != null) {
+                    Slog.w(TAG, "Only one <uses-split> permitted. Ignoring others.");
+                    continue;
+                }
+
+                usesSplitName = attrs.getAttributeValue(ANDROID_RESOURCES, "name");
+                if (usesSplitName == null) {
+                    throw new PackageParserException(
+                            PackageManager.INSTALL_PARSE_FAILED_MANIFEST_MALFORMED,
+                            "<uses-split> tag requires 'android:name' attribute");
+                }
             }
         }
 
-        return new ApkLite(codePath, packageSplit.first, packageSplit.second, versionCode,
-                revisionCode, installLocation, verifiers, signatures, certificates, coreApp,
-                debuggable, multiArch, use32bitAbi, extractNativeLibs);
+        return new ApkLite(codePath, packageSplit.first, packageSplit.second, usesSplitName,
+                versionCode, revisionCode, installLocation, verifiers, signatures,
+                certificates, coreApp, debuggable, multiArch, use32bitAbi, extractNativeLibs,
+                isolatedSplits);
     }
 
     /**
@@ -1940,6 +2011,10 @@
             pkg.applicationInfo.privateFlags |= ApplicationInfo.PRIVATE_FLAG_EPHEMERAL;
         }
 
+        if (sa.getBoolean(com.android.internal.R.styleable.AndroidManifest_isolatedSplits, false)) {
+            pkg.applicationInfo.privateFlags |= ApplicationInfo.PRIVATE_FLAG_ISOLATED_SPLIT_LOADING;
+        }
+
         // Resource boolean are -1, so 1 means we don't know the value.
         int supportsSmallScreens = 1;
         int supportsNormalScreens = 1;
@@ -3657,6 +3732,8 @@
                 continue;
             }
 
+            ComponentInfo parsedComponent = null;
+
             String tagName = parser.getName();
             if (tagName.equals("activity")) {
                 Activity a = parseActivity(owner, res, parser, flags, outError, false,
@@ -3667,6 +3744,7 @@
                 }
 
                 owner.activities.add(a);
+                parsedComponent = a.info;
 
             } else if (tagName.equals("receiver")) {
                 Activity a = parseActivity(owner, res, parser, flags, outError, true, false);
@@ -3676,6 +3754,7 @@
                 }
 
                 owner.receivers.add(a);
+                parsedComponent = a.info;
 
             } else if (tagName.equals("service")) {
                 Service s = parseService(owner, res, parser, flags, outError);
@@ -3685,6 +3764,7 @@
                 }
 
                 owner.services.add(s);
+                parsedComponent = s.info;
 
             } else if (tagName.equals("provider")) {
                 Provider p = parseProvider(owner, res, parser, flags, outError);
@@ -3694,6 +3774,7 @@
                 }
 
                 owner.providers.add(p);
+                parsedComponent = p.info;
 
             } else if (tagName.equals("activity-alias")) {
                 Activity a = parseActivityAlias(owner, res, parser, flags, outError);
@@ -3703,6 +3784,7 @@
                 }
 
                 owner.activities.add(a);
+                parsedComponent = a.info;
 
             } else if (parser.getName().equals("meta-data")) {
                 // note: application meta-data is stored off to the side, so it can
@@ -3769,6 +3851,14 @@
                     return false;
                 }
             }
+
+            if (parsedComponent != null && parsedComponent.splitName == null) {
+                // If the loaded component did not specify a split, inherit the split name
+                // based on the split it is defined in.
+                // This is used to later load the correct split when starting this
+                // component.
+                parsedComponent.splitName = owner.splitNames[splitIndex];
+            }
         }
 
         return true;
@@ -5039,18 +5129,23 @@
         return data;
     }
 
-    private static VerifierInfo parseVerifier(Resources res, XmlPullParser parser,
-            AttributeSet attrs, int flags) {
-        final TypedArray sa = res.obtainAttributes(attrs,
-                com.android.internal.R.styleable.AndroidManifestPackageVerifier);
+    private static VerifierInfo parseVerifier(AttributeSet attrs) {
+        String packageName = null;
+        String encodedPublicKey = null;
 
-        final String packageName = sa.getNonResourceString(
-                com.android.internal.R.styleable.AndroidManifestPackageVerifier_name);
+        final int attrCount = attrs.getAttributeCount();
+        for (int i = 0; i < attrCount; i++) {
+            final int attrResId = attrs.getAttributeNameResource(i);
+            switch (attrResId) {
+                case com.android.internal.R.attr.name:
+                    packageName = attrs.getAttributeValue(i);
+                    break;
 
-        final String encodedPublicKey = sa.getNonResourceString(
-                com.android.internal.R.styleable.AndroidManifestPackageVerifier_publicKey);
-
-        sa.recycle();
+                case com.android.internal.R.attr.publicKey:
+                    encodedPublicKey = attrs.getAttributeValue(i);
+                    break;
+            }
+        }
 
         if (packageName == null || packageName.length() == 0) {
             Slog.i(TAG, "verifier package name was null; skipping");
diff --git a/core/java/android/content/pm/split/DefaultSplitAssetLoader.java b/core/java/android/content/pm/split/DefaultSplitAssetLoader.java
new file mode 100644
index 0000000..5a9966d
--- /dev/null
+++ b/core/java/android/content/pm/split/DefaultSplitAssetLoader.java
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2016 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.content.pm.split;
+
+import static android.content.pm.PackageManager.INSTALL_PARSE_FAILED_BAD_MANIFEST;
+import static android.content.pm.PackageManager.INSTALL_PARSE_FAILED_NOT_APK;
+
+import android.content.pm.PackageParser;
+import android.content.res.AssetManager;
+import android.os.Build;
+
+import com.android.internal.util.ArrayUtils;
+
+import libcore.io.IoUtils;
+
+/**
+ * Loads the base and split APKs into a single AssetManager.
+ * @hide
+ */
+public class DefaultSplitAssetLoader implements SplitAssetLoader {
+    private final String mBaseCodePath;
+    private final String[] mSplitCodePaths;
+    private final int mFlags;
+
+    private AssetManager mCachedAssetManager;
+
+    public DefaultSplitAssetLoader(PackageParser.PackageLite pkg, int flags) {
+        mBaseCodePath = pkg.baseCodePath;
+        mSplitCodePaths = pkg.splitCodePaths;
+        mFlags = flags;
+    }
+
+    private static void loadApkIntoAssetManager(AssetManager assets, String apkPath, int flags)
+            throws PackageParser.PackageParserException {
+        if ((flags & PackageParser.PARSE_MUST_BE_APK) != 0 && !PackageParser.isApkPath(apkPath)) {
+            throw new PackageParser.PackageParserException(INSTALL_PARSE_FAILED_NOT_APK,
+                    "Invalid package file: " + apkPath);
+        }
+
+        if (assets.addAssetPath(apkPath) == 0) {
+            throw new PackageParser.PackageParserException(
+                    INSTALL_PARSE_FAILED_BAD_MANIFEST,
+                    "Failed adding asset path: " + apkPath);
+        }
+    }
+
+    @Override
+    public AssetManager getBaseAssetManager() throws PackageParser.PackageParserException {
+        if (mCachedAssetManager != null) {
+            return mCachedAssetManager;
+        }
+
+        AssetManager assets = new AssetManager();
+        try {
+            assets.setConfiguration(0, 0, null, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                    Build.VERSION.RESOURCES_SDK_INT);
+            loadApkIntoAssetManager(assets, mBaseCodePath, mFlags);
+
+            if (!ArrayUtils.isEmpty(mSplitCodePaths)) {
+                for (String apkPath : mSplitCodePaths) {
+                    loadApkIntoAssetManager(assets, apkPath, mFlags);
+                }
+            }
+
+            mCachedAssetManager = assets;
+            assets = null;
+            return mCachedAssetManager;
+        } finally {
+            if (assets != null) {
+                IoUtils.closeQuietly(assets);
+            }
+        }
+    }
+
+    @Override
+    public AssetManager getSplitAssetManager(int splitIdx)
+            throws PackageParser.PackageParserException {
+        return getBaseAssetManager();
+    }
+
+    @Override
+    public void close() throws Exception {
+        if (mCachedAssetManager != null) {
+            IoUtils.closeQuietly(mCachedAssetManager);
+        }
+    }
+}
diff --git a/core/java/android/content/pm/split/SplitAssetDependencyLoader.java b/core/java/android/content/pm/split/SplitAssetDependencyLoader.java
new file mode 100644
index 0000000..3ad45b6
--- /dev/null
+++ b/core/java/android/content/pm/split/SplitAssetDependencyLoader.java
@@ -0,0 +1,153 @@
+/*
+ * Copyright (C) 2016 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.content.pm.split;
+
+import static android.content.pm.PackageManager.INSTALL_PARSE_FAILED_BAD_MANIFEST;
+import static android.content.pm.PackageManager.INSTALL_PARSE_FAILED_NOT_APK;
+
+import android.content.pm.PackageParser;
+import android.content.res.AssetManager;
+import android.os.Build;
+import android.util.SparseIntArray;
+
+import libcore.io.IoUtils;
+
+import java.util.ArrayList;
+import java.util.Collections;
+
+/**
+ * Loads AssetManagers for splits and their dependencies. This SplitAssetLoader implementation
+ * is to be used when an application opts-in to isolated split loading.
+ * @hide
+ */
+public class SplitAssetDependencyLoader
+        extends SplitDependencyLoaderHelper<PackageParser.PackageParserException>
+        implements SplitAssetLoader {
+    private static final int BASE_ASSET_PATH_IDX = -1;
+    private final String mBasePath;
+    private final String[] mSplitNames;
+    private final String[] mSplitPaths;
+    private final int mFlags;
+
+    private String[] mCachedBasePaths;
+    private AssetManager mCachedBaseAssetManager;
+
+    private String[][] mCachedSplitPaths;
+    private AssetManager[] mCachedAssetManagers;
+
+    public SplitAssetDependencyLoader(PackageParser.PackageLite pkg, SparseIntArray dependencies,
+            int flags) {
+        super(dependencies);
+        mBasePath = pkg.baseCodePath;
+        mSplitNames = pkg.splitNames;
+        mSplitPaths = pkg.splitCodePaths;
+        mFlags = flags;
+        mCachedBasePaths = null;
+        mCachedBaseAssetManager = null;
+        mCachedSplitPaths = new String[mSplitNames.length][];
+        mCachedAssetManagers = new AssetManager[mSplitNames.length];
+    }
+
+    @Override
+    protected boolean isSplitCached(int splitIdx) {
+        if (splitIdx != -1) {
+            return mCachedAssetManagers[splitIdx] != null;
+        }
+        return mCachedBaseAssetManager != null;
+    }
+
+    // Adds all non-code configuration splits for this split name. The split name is expected
+    // to represent a feature split.
+    private void addAllConfigSplits(String splitName, ArrayList<String> outAssetPaths) {
+        for (int i = 0; i < mSplitNames.length; i++) {
+            if (isConfigurationSplitOf(mSplitNames[i], splitName)) {
+                outAssetPaths.add(mSplitPaths[i]);
+            }
+        }
+    }
+
+    private static AssetManager createAssetManagerWithPaths(String[] assetPaths, int flags)
+            throws PackageParser.PackageParserException {
+        final AssetManager assets = new AssetManager();
+        try {
+            assets.setConfiguration(0, 0, null, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                    Build.VERSION.RESOURCES_SDK_INT);
+
+            for (String assetPath : assetPaths) {
+                if ((flags & PackageParser.PARSE_MUST_BE_APK) != 0 &&
+                        !PackageParser.isApkPath(assetPath)) {
+                    throw new PackageParser.PackageParserException(INSTALL_PARSE_FAILED_NOT_APK,
+                            "Invalid package file: " + assetPath);
+                }
+
+                if (assets.addAssetPath(assetPath) == 0) {
+                    throw new PackageParser.PackageParserException(
+                            INSTALL_PARSE_FAILED_BAD_MANIFEST,
+                            "Failed adding asset path: " + assetPath);
+                }
+            }
+            return assets;
+        } catch (Throwable e) {
+            IoUtils.closeQuietly(assets);
+            throw e;
+        }
+    }
+
+    @Override
+    protected void constructSplit(int splitIdx, int parentSplitIdx) throws
+            PackageParser.PackageParserException {
+        final ArrayList<String> assetPaths = new ArrayList<>();
+        if (splitIdx == BASE_ASSET_PATH_IDX) {
+            assetPaths.add(mBasePath);
+            addAllConfigSplits(null, assetPaths);
+            mCachedBasePaths = assetPaths.toArray(new String[assetPaths.size()]);
+            mCachedBaseAssetManager = createAssetManagerWithPaths(mCachedBasePaths, mFlags);
+            return;
+        }
+
+        if (parentSplitIdx == BASE_ASSET_PATH_IDX) {
+            Collections.addAll(assetPaths, mCachedBasePaths);
+        } else {
+            Collections.addAll(assetPaths, mCachedSplitPaths[parentSplitIdx]);
+        }
+
+        assetPaths.add(mSplitPaths[splitIdx]);
+        addAllConfigSplits(mSplitNames[splitIdx], assetPaths);
+        mCachedSplitPaths[splitIdx] = assetPaths.toArray(new String[assetPaths.size()]);
+        mCachedAssetManagers[splitIdx] = createAssetManagerWithPaths(mCachedSplitPaths[splitIdx],
+                mFlags);
+    }
+
+    @Override
+    public AssetManager getBaseAssetManager() throws PackageParser.PackageParserException {
+        loadDependenciesForSplit(BASE_ASSET_PATH_IDX);
+        return mCachedBaseAssetManager;
+    }
+
+    @Override
+    public AssetManager getSplitAssetManager(int idx) throws PackageParser.PackageParserException {
+        loadDependenciesForSplit(idx);
+        return mCachedAssetManagers[idx];
+    }
+
+    @Override
+    public void close() throws Exception {
+        IoUtils.closeQuietly(mCachedBaseAssetManager);
+        for (AssetManager assets : mCachedAssetManagers) {
+            IoUtils.closeQuietly(assets);
+        }
+    }
+}
diff --git a/core/java/android/content/pm/split/SplitAssetLoader.java b/core/java/android/content/pm/split/SplitAssetLoader.java
new file mode 100644
index 0000000..108fb95
--- /dev/null
+++ b/core/java/android/content/pm/split/SplitAssetLoader.java
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2016 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.content.pm.split;
+
+import android.content.pm.PackageParser;
+import android.content.res.AssetManager;
+
+/**
+ * Simple interface for loading base Assets and Splits. Used by PackageParser when parsing
+ * split APKs.
+ *
+ * @hide
+ */
+public interface SplitAssetLoader extends AutoCloseable {
+    AssetManager getBaseAssetManager() throws PackageParser.PackageParserException;
+    AssetManager getSplitAssetManager(int splitIdx) throws PackageParser.PackageParserException;
+}
diff --git a/core/java/android/content/pm/split/SplitDependencyLoaderHelper.java b/core/java/android/content/pm/split/SplitDependencyLoaderHelper.java
new file mode 100644
index 0000000..b493480
--- /dev/null
+++ b/core/java/android/content/pm/split/SplitDependencyLoaderHelper.java
@@ -0,0 +1,149 @@
+/*
+ * Copyright (C) 2016 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.content.pm.split;
+
+import android.annotation.Nullable;
+import android.util.IntArray;
+import android.util.SparseIntArray;
+
+/**
+ * A helper class that implements the dependency tree traversal for splits. Callbacks
+ * are implemented by subclasses to notify whether a split has already been constructed
+ * and is cached, and to actually create the split requested.
+ *
+ * This helper is meant to be subclassed so as to reduce the number of allocations
+ * needed to make use of it.
+ *
+ * All inputs and outputs are assumed to be indices into an array of splits.
+ *
+ * @hide
+ */
+public abstract class SplitDependencyLoaderHelper<E extends Exception> {
+    @Nullable private final SparseIntArray mDependencies;
+
+    /**
+     * Construct a new SplitDependencyLoaderHelper. Meant to be called from the
+     * subclass constructor.
+     * @param dependencies The dependency tree of splits. Can be null, which leads to
+     *                     just the implicit dependency of all splits on the base.
+     */
+    protected SplitDependencyLoaderHelper(@Nullable SparseIntArray dependencies) {
+        mDependencies = dependencies;
+    }
+
+    /**
+     * Traverses the dependency tree and constructs any splits that are not already
+     * cached. This routine short-circuits and skips the creation of splits closer to the
+     * root if they are cached, as reported by the subclass implementation of
+     * {@link #isSplitCached(int)}. The construction of splits is delegated to the subclass
+     * implementation of {@link #constructSplit(int, int)}.
+     * @param splitIdx The index of the split to load. Can be -1, which represents the
+     *                 base Application.
+     */
+    protected void loadDependenciesForSplit(int splitIdx) throws E {
+        // Quick check before any allocations are done.
+        if (isSplitCached(splitIdx)) {
+            return;
+        }
+
+        final IntArray linearDependencies = new IntArray();
+        linearDependencies.add(splitIdx);
+
+        // Collect all the dependencies that need to be constructed.
+        // They will be listed from leaf to root.
+        while (splitIdx >= 0) {
+            splitIdx = mDependencies != null ? mDependencies.get(splitIdx, -1) : -1;
+            if (isSplitCached(splitIdx)) {
+                break;
+            }
+            linearDependencies.add(splitIdx);
+        }
+
+        // Visit each index, from right to left (root to leaf).
+        int parentIdx = splitIdx;
+        for (int i = linearDependencies.size() - 1; i >= 0; i--) {
+            final int idx = linearDependencies.get(i);
+            constructSplit(idx, parentIdx);
+            parentIdx = idx;
+        }
+    }
+
+    /**
+     * Subclass to report whether the split at `splitIdx` is cached and need not be constructed.
+     * It is assumed that if `splitIdx` is cached, any parent of `splitIdx` is also cached.
+     * @param splitIdx The index of the split to check for in the cache.
+     * @return true if the split is cached and does not need to be constructed.
+     */
+    protected abstract boolean isSplitCached(int splitIdx);
+
+    /**
+     * Subclass to construct a split at index `splitIdx` with parent split `parentSplitIdx`.
+     * The result is expected to be cached by the subclass in its own structures.
+     * @param splitIdx The index of the split to construct. Can be -1, which represents the
+     *                 base Application.
+     * @param parentSplitIdx The index of the parent split. Can be -1, which represents the
+     *                       base Application.
+     * @throws E
+     */
+    protected abstract void constructSplit(int splitIdx, int parentSplitIdx) throws E;
+
+    /**
+     * Returns true if `splitName` represents a Configuration split of `featureSplitName`.
+     *
+     * A Configuration split's name is prefixed with the associated Feature split's name
+     * or the empty string if the split is for the base Application APK. It is then followed by the
+     * dollar sign character "$" and some unique string that should represent the configurations
+     * the split contains.
+     *
+     * Example:
+     * <table>
+     *     <tr>
+     *         <th>Feature split name</th>
+     *         <th>Configuration split name: xhdpi</th>
+     *         <th>Configuration split name: fr-rFR</th>
+     *     </tr>
+     *     <tr>
+     *         <td>(base APK)</td>
+     *         <td><code>$xhdpi</code></td>
+     *         <td><code>$fr-rFR</code></td>
+     *     </tr>
+     *     <tr>
+     *         <td><code>Extras</code></td>
+     *         <td><code>Extras$xhdpi</code></td>
+     *         <td><code>Extras$fr-rFR</code></td>
+     *     </tr>
+     * </table>
+     *
+     * @param splitName The name of the split to check.
+     * @param featureSplitName The name of the Feature split. May be null or "" if checking
+     *                         the base Application APK.
+     * @return true if the splitName represents a Configuration split of featureSplitName.
+     */
+    protected static boolean isConfigurationSplitOf(String splitName, String featureSplitName) {
+        if (featureSplitName == null || featureSplitName.length() == 0) {
+            // We are looking for configuration splits of the base, which have some legacy support.
+            if (splitName.startsWith("config_")) {
+                return true;
+            } else if (splitName.startsWith("$")) {
+                return true;
+            } else {
+                return false;
+            }
+        } else {
+            return splitName.startsWith(featureSplitName + "$");
+        }
+    }
+}
diff --git a/core/java/android/os/Parcel.java b/core/java/android/os/Parcel.java
index d6d5cb6..1db685a 100644
--- a/core/java/android/os/Parcel.java
+++ b/core/java/android/os/Parcel.java
@@ -26,6 +26,7 @@
 import android.util.SizeF;
 import android.util.SparseArray;
 import android.util.SparseBooleanArray;
+import android.util.SparseIntArray;
 
 import libcore.util.SneakyThrow;
 
@@ -891,6 +892,21 @@
         }
     }
 
+    public final void writeSparseIntArray(SparseIntArray val) {
+        if (val == null) {
+            writeInt(-1);
+            return;
+        }
+        int N = val.size();
+        writeInt(N);
+        int i=0;
+        while (i < N) {
+            writeInt(val.keyAt(i));
+            writeInt(val.valueAt(i));
+            i++;
+        }
+    }
+
     public final void writeBooleanArray(boolean[] val) {
         if (val != null) {
             int N = val.length;
@@ -2154,6 +2170,20 @@
     }
 
     /**
+     * Read and return a new SparseIntArray object from the parcel at the current
+     * dataPosition(). Returns null if the previously written array object was null.
+     */
+    public final SparseIntArray readSparseIntArray() {
+        int N = readInt();
+        if (N < 0) {
+            return null;
+        }
+        SparseIntArray sa = new SparseIntArray(N);
+        readSparseIntArrayInternal(sa, N);
+        return sa;
+    }
+
+    /**
      * Read and return a new ArrayList containing a particular object type from
      * the parcel that was written with {@link #writeTypedList} at the
      * current dataPosition().  Returns null if the
@@ -2922,6 +2952,15 @@
         }
     }
 
+    private void readSparseIntArrayInternal(SparseIntArray outVal, int N) {
+        while (N > 0) {
+            int key = readInt();
+            int value = readInt();
+            outVal.append(key, value);
+            N--;
+        }
+    }
+
     /**
      * @hide For testing
      */
diff --git a/core/res/res/values/attrs_manifest.xml b/core/res/res/values/attrs_manifest.xml
index 113ace3..0dde91b 100644
--- a/core/res/res/values/attrs_manifest.xml
+++ b/core/res/res/values/attrs_manifest.xml
@@ -1001,6 +1001,13 @@
         <enum name="preferExternal" value="2" />
     </attr>
 
+    <!-- If set to <code>true</code>, indicates to the platform that any split APKs
+         installed for this application should be loaded into their own Context
+         objects and not appear in the base application's Context.
+
+         <p>The default value of this attribute is <code>false</code>. -->
+    <attr name="isolatedSplits" format="boolean" />
+
     <!-- Extra options for an activity's UI. Applies to either the {@code <activity>} or
          {@code <application>} tag. If specified on the {@code <application>}
          tag these will be considered defaults for all activities in the
@@ -1266,6 +1273,7 @@
         <attr name="sharedUserId" />
         <attr name="sharedUserLabel" />
         <attr name="installLocation" />
+        <attr name="isolatedSplits" />
     </declare-styleable>
 
     <!-- The <code>application</code> tag describes application-level components
@@ -2462,4 +2470,8 @@
         <attr name="hash" format="string" />
     </declare-styleable>
 
+    <declare-styleable name="AndroidManifestUsesSplit" parent="AndroidManifest">
+        <attr name="name" format="string" />
+    </declare-styleable>
+
 </resources>
diff --git a/core/res/res/values/public.xml b/core/res/res/values/public.xml
index e387650..1146871 100644
--- a/core/res/res/values/public.xml
+++ b/core/res/res/values/public.xml
@@ -2789,6 +2789,7 @@
         <public name="certDigest" />
         <public name="splitName" />
         <public name="colorMode" />
+        <public name="isolatedSplits" />
     </public-group>
 
     <public-group type="style" first-id="0x010302e0">
diff --git a/services/core/java/com/android/server/pm/PackageInstallerSession.java b/services/core/java/com/android/server/pm/PackageInstallerSession.java
index d1aed3e..067a136 100644
--- a/services/core/java/com/android/server/pm/PackageInstallerSession.java
+++ b/services/core/java/com/android/server/pm/PackageInstallerSession.java
@@ -894,7 +894,7 @@
 
         // This is kind of hacky; we're creating a half-parsed package that is
         // straddled between the inherited and staged APKs.
-        final PackageLite pkg = new PackageLite(null, baseApk, null,
+        final PackageLite pkg = new PackageLite(null, baseApk, null, null,
                 splitPaths.toArray(new String[splitPaths.size()]), null);
         final boolean isForwardLocked =
                 (params.installFlags & PackageManager.INSTALL_FORWARD_LOCK) != 0;
diff --git a/services/core/java/com/android/server/pm/PackageManagerService.java b/services/core/java/com/android/server/pm/PackageManagerService.java
index 63a5d14..9899cd4 100644
--- a/services/core/java/com/android/server/pm/PackageManagerService.java
+++ b/services/core/java/com/android/server/pm/PackageManagerService.java
@@ -10101,8 +10101,10 @@
                 a.info.packageName = pkg.applicationInfo.packageName;
                 a.info.sourceDir = pkg.applicationInfo.sourceDir;
                 a.info.publicSourceDir = pkg.applicationInfo.publicSourceDir;
+                a.info.splitNames = pkg.splitNames;
                 a.info.splitSourceDirs = pkg.applicationInfo.splitSourceDirs;
                 a.info.splitPublicSourceDirs = pkg.applicationInfo.splitPublicSourceDirs;
+                a.info.splitDependencies = pkg.applicationInfo.splitDependencies;
                 a.info.dataDir = pkg.applicationInfo.dataDir;
                 a.info.deviceProtectedDataDir = pkg.applicationInfo.deviceProtectedDataDir;
                 a.info.credentialProtectedDataDir = pkg.applicationInfo.credentialProtectedDataDir;
diff --git a/services/core/java/com/android/server/pm/PackageManagerShellCommand.java b/services/core/java/com/android/server/pm/PackageManagerShellCommand.java
index 49b96b0..2f8d749 100644
--- a/services/core/java/com/android/server/pm/PackageManagerShellCommand.java
+++ b/services/core/java/com/android/server/pm/PackageManagerShellCommand.java
@@ -162,7 +162,7 @@
             if (file.isFile()) {
                 try {
                     ApkLite baseApk = PackageParser.parseApkLite(file, 0);
-                    PackageLite pkgLite = new PackageLite(null, baseApk, null, null, null);
+                    PackageLite pkgLite = new PackageLite(null, baseApk, null, null, null, null);
                     params.sessionParams.setSize(PackageHelper.calculateInstalledSize(
                             pkgLite, false, params.sessionParams.abiOverride));
                 } catch (PackageParserException | IOException e) {
diff --git a/test-runner/src/android/test/mock/MockContext.java b/test-runner/src/android/test/mock/MockContext.java
index b6e701e..9ffd92d 100644
--- a/test-runner/src/android/test/mock/MockContext.java
+++ b/test-runner/src/android/test/mock/MockContext.java
@@ -692,6 +692,13 @@
         return null;
     }
 
+    /** @hide */
+    @Override
+    public Context createContextForSplit(String splitName)
+            throws PackageManager.NameNotFoundException {
+        throw new UnsupportedOperationException();
+    }
+
     /** {@hide} */
     @Override
     public Context createPackageContextAsUser(String packageName, int flags, UserHandle user)
diff --git a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/android/BridgeContext.java b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/android/BridgeContext.java
index 68680d5..dff4f69 100644
--- a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/android/BridgeContext.java
+++ b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/android/BridgeContext.java
@@ -1325,6 +1325,12 @@
     }
 
     @Override
+    public Context createContextForSplit(String splitName) {
+        // pass
+        return null;
+    }
+
+    @Override
     public String[] databaseList() {
         // pass
         return null;