RecyclerView与CoordinatorLayout，AppBarLayout，CollapsingToolbarLayout 解决上滑到toolbar卡顿

<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.SwipeRefreshLayout android:id="@id/contentView" android:layout_width="match_parent" android:layout_height="match_parent" android:backg

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