问题：

RecyclerView 调用notifyItemChanged()方法更新单个Item时，此Item有闪烁

源码分析：

在android.support.v7.widget.RecyclerView中：

    ....
    ItemAnimator mItemAnimator = new DefaultItemAnimator();
    ....
    /**
     * Gets the current ItemAnimator for this RecyclerView. A null return value
     * indicates that there is no animator and that item changes will happen without
     * any animations. By default, RecyclerView instantiates and
     * uses an instance of {@link DefaultItemAnimator}.
     *
     * @return ItemAnimator The current ItemAnimator. If null, no animations will occur
     * when changes occur to the items in this RecyclerView.
     */
    public ItemAnimator getItemAnimator() {
        return mItemAnimator;
    }
    ....
    /**
     * Sets the {@link ItemAnimator} that will handle animations involving changes
     * to the items in this RecyclerView. By default, RecyclerView instantiates and
     * uses an instance of {@link DefaultItemAnimator}. Whether item animations are
     * enabled for the RecyclerView depends on the ItemAnimator and whether
     * the LayoutManager {@link LayoutManager#supportsPredictiveItemAnimations()
     * supports item animations}.
     *
     * @param animator The ItemAnimator being set. If null, no animations will occur
     * when changes occur to the items in this RecyclerView.
     */
    public void setItemAnimator(ItemAnimator animator) {
        if (mItemAnimator != null) {
            mItemAnimator.endAnimations();
            mItemAnimator.setListener(null);
        }
        mItemAnimator = animator;
        if (mItemAnimator != null) {
            mItemAnimator.setListener(mItemAnimatorListener);
        }
    }
    ....

可以看出RecyclerView 默认实现了一个DefaultItemAnimator，而DefaultItemAnimator继承自SimpleItemAnimator，里面有个方法是：

    /**
     * Sets whether this ItemAnimator supports animations of item change events.
     * If you set this property to false, actions on the data set which change the
     * contents of items will not be animated. What those animations do is left
     * up to the discretion of the ItemAnimator subclass, in its
     * {@link #animateChange(ViewHolder, ViewHolder, int, int, int, int)} implementation.
     * The value of this property is true by default.
     *
     * @param supportsChangeAnimations true if change animations are supported by
     *                                 this ItemAnimator, false otherwise. If the property is false,
     *                                 the ItemAnimator
     *                                 will not receive a call to
     *                                 {@link #animateChange(ViewHolder, ViewHolder, int, int, int,
     *                                 int)} when changes occur.
     * @see Adapter#notifyItemChanged(int)
     * @see Adapter#notifyItemRangeChanged(int, int)
     */
    public void setSupportsChangeAnimations(boolean supportsChangeAnimations) {
        mSupportsChangeAnimations = supportsChangeAnimations;
    }

只要设置为false，就可以不显示动画了，也就解决了闪烁问题。 （所有的notifyItem*动画都取消了）

解决办法：

        ((SimpleItemAnimator)mRecyclerView.getItemAnimator()).setSupportsChangeAnimations(false);

疑问：

用上面的方式好像会取消掉所有的动画，如果我只想取消notifyItemChanged()时的动画，其他如notifyItemInserted();的动画保留要怎么做呢？