Improve Animation Calculations to remove Jank

Add animations to back button press path.

Add scroll for launches of unfocused apps.

Part 1 of 2 to fix:

b/27876144

Change-Id: I1ac345dffb06d7926558a4087b07061ee4be731b

packages/SystemUI/src/com/android/systemui/recents/tv/RecentsTvImpl.java

@@ -31,8 +31,10 @@ import com.android.systemui.recents.RecentsConfiguration;
 import com.android.systemui.recents.RecentsImpl;
 import com.android.systemui.recents.events.EventBus;
 import com.android.systemui.recents.events.activity.RecentsActivityStartingEvent;
+import com.android.systemui.recents.misc.SystemServicesProxy;
 import com.android.systemui.recents.model.RecentsTaskLoader;
 import com.android.systemui.recents.model.TaskStack;
+import com.android.systemui.recents.model.ThumbnailData;
 import com.android.systemui.recents.tv.views.TaskCardView;
 
 public class RecentsTvImpl extends RecentsImpl{
@@ -124,12 +126,15 @@ public class RecentsTvImpl extends RecentsImpl{
      */
     private ActivityOptions getThumbnailTransitionActivityOptionsForTV(
             ActivityManager.RunningTaskInfo topTask) {
-        Bitmap thumbnail = mThumbTransitionBitmapCache;
         Rect rect = TaskCardView.getStartingCardThumbnailRect(mContext);
-        if (thumbnail != null) {
+        SystemServicesProxy ssp = Recents.getSystemServices();
+        ThumbnailData thumbnailData = ssp.getTaskThumbnail(topTask.id);
+        if (thumbnailData.thumbnail != null) {
+            Bitmap thumbnail = Bitmap.createScaledBitmap(thumbnailData.thumbnail, rect.width(),
+                    rect.height(), false);
             return ActivityOptions.makeThumbnailAspectScaleDownAnimation(mDummyStackView,
-                    null, (int) rect.left, (int) rect.top,
-                    (int) rect.width(), (int) rect.height(), mHandler, null);
+                    thumbnail, (int) rect.left, (int) rect.top, (int) rect.width(),
+                    (int) rect.height(), mHandler, null);
         }
         // If both the screenshot and thumbnail fails, then just fall back to the default transition
         return getUnknownTransitionActivityOptions();

packages/SystemUI/src/com/android/systemui/recents/tv/views/RecentsTvTransitionHelper.java

@@ -16,8 +16,10 @@
 package com.android.systemui.recents.tv.views;
 
 import android.annotation.Nullable;
+import android.app.Activity;
 import android.app.ActivityOptions;
 import android.content.Context;
+import android.graphics.Bitmap;
 import android.graphics.Rect;
 import android.os.Bundle;
 import android.os.Handler;
@@ -120,8 +122,10 @@ public class RecentsTvTransitionHelper {
         }
         try {
             Rect taskRect = taskView.getFocusedThumbnailRect();
+            Bitmap thumbnail = Bitmap.createScaledBitmap(task.thumbnail, taskRect.width(),
+                    taskRect.height(), false);
             WindowManagerGlobal.getWindowManagerService()
-                    .overridePendingAppTransitionAspectScaledThumb(task.thumbnail, taskRect.left,
+                    .overridePendingAppTransitionAspectScaledThumb(thumbnail, taskRect.left,
                             taskRect.top, taskRect.width(), taskRect.height(), callback, true);
         } catch (RemoteException e) {
             Log.w(TAG, "Failed to override transition: " + e);

packages/SystemUI/src/com/android/systemui/recents/tv/views/RecentsTvView.java

@@ -18,7 +18,10 @@ package com.android.systemui.recents.tv.views;
 import android.content.Context;
 import android.graphics.Rect;
 import android.os.Handler;
+import android.support.v7.widget.DefaultItemAnimator;
+import android.support.v7.widget.RecyclerView;
 import android.util.AttributeSet;
+import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.WindowInsets;
@@ -32,15 +35,15 @@ import com.android.systemui.recents.RecentsConfiguration;
 import com.android.systemui.recents.events.EventBus;
 import com.android.systemui.recents.events.activity.CancelEnterRecentsWindowAnimationEvent;
 import com.android.systemui.recents.events.activity.DismissRecentsToHomeAnimationStarted;
+import com.android.systemui.recents.events.activity.ExitRecentsWindowFirstAnimationFrameEvent;
 import com.android.systemui.recents.events.activity.LaunchTvTaskEvent;
 import com.android.systemui.recents.events.component.RecentsVisibilityChangedEvent;
 import com.android.systemui.recents.misc.SystemServicesProxy;
 import com.android.systemui.recents.model.Task;
 import com.android.systemui.recents.model.TaskStack;
 import com.android.systemui.recents.tv.animations.RecentsRowFocusAnimationHolder;
-
-import java.util.ArrayList;
-import java.util.List;
+import android.support.v7.widget.RecyclerView.OnScrollListener;
+import static android.app.ActivityManager.StackId.INVALID_STACK_ID;
 
 /**
  * Top level layout of recents for TV. This will show the TaskStacks using a HorizontalGridView.
@@ -58,7 +61,7 @@ public class RecentsTvView extends FrameLayout {
     private Rect mSystemInsets = new Rect();
     private RecentsTvTransitionHelper mTransitionHelper;
     private Handler mHandler;
-
+    private OnScrollListener mScrollListener;
     public RecentsTvView(Context context) {
         this(context, null);
     }
@@ -111,8 +114,7 @@ public class RecentsTvView extends FrameLayout {
         if (mTaskStackHorizontalView != null) {
             Task task = mTaskStackHorizontalView.getFocusedTask();
             if (task != null) {
-                SystemServicesProxy ssp = Recents.getSystemServices();
-                ssp.startActivityFromRecents(getContext(), task.key, task.title, null);
+                launchTaskFomRecents(task);
                 return true;
             }
         }
@@ -125,25 +127,53 @@ public class RecentsTvView extends FrameLayout {
             TaskStack stack = mTaskStackHorizontalView.getStack();
             Task task = stack.getLaunchTarget();
             if (task != null) {
-                SystemServicesProxy ssp = Recents.getSystemServices();
-                ssp.startActivityFromRecents(getContext(), task.key, task.title, null);
+                launchTaskFomRecents(task);
                 return true;
             }
         }
         return false;
     }
 
-    /** Launches a given task. */
-    public boolean launchTask(Task task, Rect taskBounds, int destinationStack) {
-        if (mTaskStackHorizontalView != null) {
-            // Iterate the stack views and try and find the given task.
-            if (mTaskStackHorizontalView.getChildViewForTask(task) != null) {
-                SystemServicesProxy ssp = Recents.getSystemServices();
-                ssp.startActivityFromRecents(getContext(), task.key, task.title, null);
-                return true;
+    /**
+     * Launch the given task from recents with animation. If the task is not focused, this will
+     * attempt to scroll to focus the task before launching.
+     * @param task
+     */
+    private void launchTaskFomRecents(final Task task) {
+        if(task != mTaskStackHorizontalView.getFocusedTask()) {
+            if(mScrollListener != null) {
+                mTaskStackHorizontalView.removeOnScrollListener(mScrollListener);
             }
+            mScrollListener = new OnScrollListener() {
+                @Override
+                public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
+                    super.onScrollStateChanged(recyclerView, newState);
+                    if(newState == RecyclerView.SCROLL_STATE_IDLE) {
+                        TaskCardView cardView = mTaskStackHorizontalView.getChildViewForTask(task);
+                        if(cardView != null) {
+                            mTransitionHelper.launchTaskFromRecents(mStack, task,
+                                    mTaskStackHorizontalView, cardView, null, INVALID_STACK_ID);
+                        } else {
+                            // This should not happen normally. If this happens then the data in
+                            // the grid view was altered during the scroll. Log error and launch
+                            // task with no animation.
+                            Log.e(TAG, "Card view for task : " + task + ", returned null.");
+                            SystemServicesProxy ssp = Recents.getSystemServices();
+                            ssp.startActivityFromRecents(getContext(), task.key, task.title, null);
+                        }
+                        mTaskStackHorizontalView.removeOnScrollListener(mScrollListener);
+                    }
+                }
+            };
+            mTaskStackHorizontalView.addOnScrollListener(mScrollListener);
+            mTaskStackHorizontalView.setSelectedPositionSmooth(
+                    ((TaskStackHorizontalViewAdapter) mTaskStackHorizontalView.getAdapter())
+                            .getPositionOfTask(task));
+        } else {
+            mTransitionHelper.launchTaskFromRecents(mStack, task, mTaskStackHorizontalView,
+                    mTaskStackHorizontalView.getChildViewForTask(task), null,
+                    INVALID_STACK_ID);
         }
-        return false;
     }
 
     /**

packages/SystemUI/src/com/android/systemui/recents/tv/views/TaskCardView.java

@@ -91,13 +91,6 @@ public class TaskCardView extends LinearLayout {
     public Rect getFocusedThumbnailRect() {
         Rect r = new Rect();
         mThumbnailView.getGlobalVisibleRect(r);
-        TypedValue out = new TypedValue();
-        getContext().getResources().getValue(R.integer.selected_scale, out, true);
-        float deltaScale = (out.getFloat() - 1.0f) / 2;
-        r.set((int) (r.left - r.left * deltaScale),
-                (int) (r.top - r.top * deltaScale),
-                (int) (r.right + r.right * deltaScale),
-                (int) (r.bottom + r.bottom * deltaScale));
         return r;
     }
 

packages/SystemUI/src/com/android/systemui/recents/tv/views/TaskStackHorizontalViewAdapter.java

@@ -131,4 +131,9 @@ public class TaskStackHorizontalViewAdapter extends
         mTaskList.remove(position);
         notifyItemRemoved(position);
     }
+
+    public int getPositionOfTask(Task task) {
+        int position = mTaskList.indexOf(task);
+        return (position >= 0) ? position : 0;
+    }
 }