Only allow 1 Stack on Leanback-only devices

   - For Leanback only devices we will force all activities to
   live in the same app stack. This is a design decision for the
   shy/gregarious changes we are planning to implement for
   leanback devices.

Change-Id: I5e65f9b079830a9485b5a136700993755c3f555f

1 files changed, 23 insertions, 1 deletions

diff --git a/services/core/java/com/android/server/am/ActivityStackSupervisor.java b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
index ae7fab3..f487536 100644
--- a/services/core/java/com/android/server/am/ActivityStackSupervisor.java
+++ b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
@@ -207,6 +207,10 @@ public final class ActivityStackSupervisor implements DisplayListener {
     /** Set when we have taken too long waiting to go to sleep. */
     boolean mSleepTimeout = false;
 
+    /** Indicates if we are running on a Leanback-only (TV) device. Only initialized after
+     * setWindowManager is called. **/
+    private boolean mLeanbackOnlyDevice;
+
     /**
      * We don't want to allow the device to go to sleep while in the process
      * of launching an activity.  This is primarily to allow alarm intent
@@ -271,6 +275,9 @@ public final class ActivityStackSupervisor implements DisplayListener {
             mHomeStack = mFocusedStack = mLastFocusedStack = getStack(HOME_STACK_ID);
 
             mInputManagerInternal = LocalServices.getService(InputManagerInternal.class);
+
+            // Initialize this here, now that we can get a valid reference to PackageManager.
+            mLeanbackOnlyDevice = isLeanbackOnlyDevice();
         }
     }
 
@@ -1387,7 +1394,10 @@ public final class ActivityStackSupervisor implements DisplayListener {
 
     ActivityStack adjustStackFocus(ActivityRecord r, boolean newTask) {
         final TaskRecord task = r.task;
-        if (r.isApplicationActivity() || (task != null && task.isApplicationTask())) {
+
+        // On leanback only devices we should keep all activities in the same stack.
+        if (!mLeanbackOnlyDevice &&
+                (r.isApplicationActivity() || (task != null && task.isApplicationTask()))) {
             if (task != null) {
                 final ActivityStack taskStack = task.stack;
                 if (taskStack.isOnHomeDisplay()) {
@@ -3440,4 +3450,16 @@ public final class ActivityStackSupervisor implements DisplayListener {
             return "VirtualActivityDisplay={" + mDisplayId + "}";
         }
     }
+
+    private boolean isLeanbackOnlyDevice() {
+        boolean onLeanbackOnly = false;
+        try {
+            onLeanbackOnly = AppGlobals.getPackageManager().hasSystemFeature(
+                    PackageManager.FEATURE_LEANBACK_ONLY);
+        } catch (RemoteException e) {
+            // noop
+        }
+
+        return onLeanbackOnly;
+    }
 }