Skip animation in error case, log for further investigation.

import android.animation.AnimatorListenerAdapter;

import android.content.Context;

import android.content.res.Resources;

import android.graphics.Path;

import android.graphics.RectF;

import android.util.Log;

import android.view.View;

import android.view.animation.Interpolator;

import android.view.animation.PathInterpolator;

        TaskStackViewScroller stackScroller = mStackView.getScroller();

        TaskStack stack = mStackView.getStack();

        final float curScroll = stackScroller.getStackScroll();

        final float newScroll = stackLayout.getStackScrollForTask(newFocusedTask);

        boolean willScrollToFront = newScroll > stackScroller.getStackScroll();

        boolean willScroll = Float.compare(newScroll, stackScroller.getStackScroll()) != 0;

        boolean willScrollToFront = newScroll > curScroll;

        boolean willScroll = Float.compare(newScroll, curScroll) != 0;

        // Get the current set of task transforms

        int taskViewCount = mStackView.getTaskViews().size();

        ArrayList<Task> stackTasks = stack.getStackTasks();

        mStackView.getCurrentTaskTransforms(stackTasks, mTmpCurrentTaskTransforms);

        // Focus the task view

        TaskView newFocusedTaskView = mStackView.getChildViewForTask(newFocusedTask);

        if (newFocusedTaskView == null) {

            // Log the error if we have no task view, and skip the animation

            Log.e("TaskStackAnimationHelper", "b/27389156 null-task-view prebind:" + taskViewCount +

                    " postbind:" + mStackView.getTaskViews().size() + " prescroll:" + curScroll +

                    " postscroll: " + newScroll);

            return false;

        }

        newFocusedTaskView.setFocusedState(true, requestViewFocus);

        // Setup the end listener to return all the hidden views to the view pool after the

        });

        List<TaskView> taskViews = mStackView.getTaskViews();

        int taskViewCount = taskViews.size();

        taskViewCount = taskViews.size();

        int newFocusTaskViewIndex = taskViews.indexOf(newFocusedTaskView);

        for (int i = 0; i < taskViewCount; i++) {

            TaskView tv = taskViews.get(i);