Implement issue #3221502: New APIs to support new back stack / task navigation

What this adds:

- A new Intent activity flag to completely replace an existing task.
- A new Intent activity flag to bring the current home task up behind
  a new task being started/brought to the foreground.
- New versions of startActivity() that take an array of Intents to be
  started, allowing applications to start a task in a specific state.
- A public moveTaskToFront() method on ActivityManager, with a new flag
  that allows the caller to have the task moved to the front with the
  current home task immediately behind it.

Change-Id: Ie8028d09acffb5349d98043c67676daba09f75c8

2 files changed, 10 insertions, 11 deletions

diff --git a/packages/SystemUI/src/com/android/systemui/recent/RecentApplicationsActivity.java b/packages/SystemUI/src/com/android/systemui/recent/RecentApplicationsActivity.java
index ff2a4ed..a98ef0b 100644
--- a/packages/SystemUI/src/com/android/systemui/recent/RecentApplicationsActivity.java
+++ b/packages/SystemUI/src/com/android/systemui/recent/RecentApplicationsActivity.java
@@ -193,14 +193,13 @@ public class RecentApplicationsActivity extends Activity {
                 ActivityDescription item = mActivityDescriptions.get(n);
                 if (item.id >= 0) {
                     // This is an active task; it should just go to the foreground.
-                    IActivityManager am = ActivityManagerNative.getDefault();
-                    try {
-                        am.moveTaskToFront(item.id);
-                    } catch (RemoteException e) {
-                    }
+                    final ActivityManager am = (ActivityManager)
+                            getSystemService(Context.ACTIVITY_SERVICE);
+                    am.moveTaskToFront(item.id, ActivityManager.MOVE_TASK_WITH_HOME);
                 } else if (item.intent != null) {
                     // prepare a launch intent and send it
-                    item.intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY);
+                    item.intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY
+                            | Intent.FLAG_ACTIVITY_TASK_ON_HOME);
                     try {
                         if (DBG) Log.v(TAG, "Starting intent " + item.intent);
                         startActivity(item.intent);
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/tablet/RecentAppsPanel.java b/packages/SystemUI/src/com/android/systemui/statusbar/tablet/RecentAppsPanel.java
index e0b05f9..0c31304 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/tablet/RecentAppsPanel.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/tablet/RecentAppsPanel.java
@@ -252,13 +252,13 @@ public class RecentAppsPanel extends LinearLayout implements StatusBarPanel, OnC
         ActivityDescription ad = (ActivityDescription)v.getTag();
         if (ad.id >= 0) {
             // This is an active task; it should just go to the foreground.
-            IActivityManager am = ActivityManagerNative.getDefault();
-            try {
-                am.moveTaskToFront(ad.id);
-            } catch (RemoteException e) {
-            }
+            final ActivityManager am = (ActivityManager)
+                    getContext().getSystemService(Context.ACTIVITY_SERVICE);
+            am.moveTaskToFront(ad.id, ActivityManager.MOVE_TASK_WITH_HOME);
         } else {
             Intent intent = ad.intent;
+            intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY
+                    | Intent.FLAG_ACTIVITY_TASK_ON_HOME);
             if (DEBUG) Log.v(TAG, "Starting activity " + intent);
             getContext().startActivity(intent);
         }