Merge "Reuse tasks in background in priority for split screen" into tm-qpr-dev

libs/WindowManager/Shell/src/com/android/wm/shell/recents/RecentTasksController.java

@@ -24,6 +24,7 @@ import static com.android.wm.shell.common.ExecutorUtils.executeRemoteCallWithTas
 import android.app.ActivityManager;
 import android.app.ActivityTaskManager;
 import android.app.TaskInfo;
+import android.content.ComponentName;
 import android.content.Context;
 import android.os.RemoteException;
 import android.util.Slog;
@@ -327,6 +328,28 @@ public class RecentTasksController implements TaskStackListenerCallback,
         return recentTasks;
     }
 
+    /**
+     * Find the background task that match the given component.
+     */
+    @Nullable
+    public ActivityManager.RecentTaskInfo findTaskInBackground(ComponentName componentName) {
+        if (componentName == null) {
+            return null;
+        }
+        List<ActivityManager.RecentTaskInfo> tasks = getRawRecentTasks(Integer.MAX_VALUE,
+                ActivityManager.RECENT_IGNORE_UNAVAILABLE, ActivityManager.getCurrentUser());
+        for (int i = 0; i < tasks.size(); i++) {
+            final ActivityManager.RecentTaskInfo task = tasks.get(i);
+            if (task.isVisible) {
+                continue;
+            }
+            if (componentName.equals(task.baseIntent.getComponent())) {
+                return task;
+            }
+        }
+        return null;
+    }
+
     public void dump(@NonNull PrintWriter pw, String prefix) {
         final String innerPrefix = prefix + "  ";
         pw.println(prefix + TAG);

libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/SplitScreenController.java

@@ -385,6 +385,9 @@ public class SplitScreenController implements DragAndDropPolicy.Starter,
             }
             @Override
             public void onAnimationCancelled(boolean isKeyguardOccluded) {
+                final WindowContainerTransaction evictWct = new WindowContainerTransaction();
+                mStageCoordinator.prepareEvictInvisibleChildTasks(evictWct);
+                mSyncQueue.queue(evictWct);
             }
         };
         options = mStageCoordinator.resolveStartStage(STAGE_TYPE_UNDEFINED, position, options,
@@ -472,8 +475,16 @@ public class SplitScreenController implements DragAndDropPolicy.Starter,
         fillInIntent.addFlags(FLAG_ACTIVITY_NO_USER_ACTION);
 
         // Flag with MULTIPLE_TASK if this is launching the same activity into both sides of the
-        // split.
+        // split and there is no reusable background task.
         if (shouldAddMultipleTaskFlag(intent.getIntent(), position)) {
+            final ActivityManager.RecentTaskInfo taskInfo = mRecentTasksOptional.isPresent()
+                    ? mRecentTasksOptional.get().findTaskInBackground(
+                            intent.getIntent().getComponent())
+                    : null;
+            if (taskInfo != null) {
+                startTask(taskInfo.taskId, position, options);
+                return;
+            }
             fillInIntent.addFlags(FLAG_ACTIVITY_MULTIPLE_TASK);
             ProtoLog.v(ShellProtoLogGroup.WM_SHELL_SPLIT_SCREEN, "Adding MULTIPLE_TASK");
         }