Merge "Make android:cantSaveState an optional feature." into pi-dev

api/current.txt

@@ -11274,6 +11274,7 @@ package android.content.pm {
     field public static final java.lang.String FEATURE_CAMERA_FLASH = "android.hardware.camera.flash";
     field public static final java.lang.String FEATURE_CAMERA_FRONT = "android.hardware.camera.front";
     field public static final java.lang.String FEATURE_CAMERA_LEVEL_FULL = "android.hardware.camera.level.full";
+    field public static final java.lang.String FEATURE_CANT_SAVE_STATE = "android.software.cant_save_state";
     field public static final java.lang.String FEATURE_COMPANION_DEVICE_SETUP = "android.software.companion_device_setup";
     field public static final java.lang.String FEATURE_CONNECTION_SERVICE = "android.software.connectionservice";
     field public static final java.lang.String FEATURE_CONSUMER_IR = "android.hardware.consumerir";

core/java/android/content/pm/PackageManager.java

@@ -2281,6 +2281,13 @@ public abstract class PackageManager {
      */
     @SdkConstant(SdkConstantType.FEATURE)
     public static final String FEATURE_APP_WIDGETS = "android.software.app_widgets";
+    /**
+     * Feature for {@link #getSystemAvailableFeatures} and
+     * {@link #hasSystemFeature}: The device supports the
+     * {@link android.R.attr#cantSaveState} API.
+     */
+    @SdkConstant(SdkConstantType.FEATURE)
+    public static final String FEATURE_CANT_SAVE_STATE = "android.software.cant_save_state";
 
     /**
      * @hide

services/core/java/com/android/server/am/ActivityManagerService.java

@@ -1970,6 +1970,8 @@ public class ActivityManagerService extends IActivityManager.Stub
 
     final boolean mPermissionReviewRequired;
 
+    boolean mHasHeavyWeightFeature;
+
     /**
      * Whether to force background check on all apps (for battery saver) or not.
      */
@@ -15081,6 +15083,8 @@ public class ActivityManagerService extends IActivityManager.Stub
                 return;
             }
 
+            mHasHeavyWeightFeature = mContext.getPackageManager().hasSystemFeature(
+                    PackageManager.FEATURE_CANT_SAVE_STATE);
             mLocalDeviceIdleController
                     = LocalServices.getService(DeviceIdleController.LocalService.class);
             mAssistUtils = new AssistUtils(mContext);

services/core/java/com/android/server/am/ActivityStackSupervisor.java

@@ -1526,7 +1526,8 @@ public class ActivityStackSupervisor extends ConfigurationContainer implements D
                 mService.getLifecycleManager().scheduleTransaction(clientTransaction);
 
 
-                if ((app.info.privateFlags & ApplicationInfo.PRIVATE_FLAG_CANT_SAVE_STATE) != 0) {
+                if ((app.info.privateFlags & ApplicationInfo.PRIVATE_FLAG_CANT_SAVE_STATE) != 0
+                        && mService.mHasHeavyWeightFeature) {
                     // This may be a heavy-weight process!  Note that the package
                     // manager will ensure that only activity can run in the main
                     // process of the .apk, which is the only thing that will be

services/core/java/com/android/server/am/ActivityStarter.java

@@ -1023,7 +1023,8 @@ class ActivityStarter {
 
             if (aInfo != null &&
                     (aInfo.applicationInfo.privateFlags
-                            & ApplicationInfo.PRIVATE_FLAG_CANT_SAVE_STATE) != 0) {
+                            & ApplicationInfo.PRIVATE_FLAG_CANT_SAVE_STATE) != 0 &&
+                    mService.mHasHeavyWeightFeature) {
                 // This may be a heavy-weight process!  Check to see if we already
                 // have another, different heavy-weight process running.
                 if (aInfo.processName.equals(aInfo.applicationInfo.packageName)) {