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发布于:2019-4-9 12:13:36  访问:0 次 回复:0 篇
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Integrate Remote Data Into Your App
Toward the end of the android recyclerview tutorial Essentials bootcamp, students learn to load images from the web into a RecyclerView. Separating your app`s UI data from your Activity and Fragment classes lets you better follow the single responsibility principle: Your activities and fragments are responsible for drawing data to the screen, while your ViewModel can take care of holding and processing all the data needed for the UI.
To provide a new view, RecyclerView either creates a new ViewHolder object to inflate the layout and hold those references, or it recycles one from the existing stack. The RecyclerView here uses a simple LinearLayoutManager provided by the support library. To have a smooth experience in our RecyclerViews, we`ve also used some caching tricks directly on the RecyclerView itself.
The reasons a developer would introduce a layer between the view and the model still exists despite the capability of binding data more closely to the UI. When using data binding, we call that layer the View-Model. Let`s just say 5 and when a user scrolls, previous rows will be recycled, and the new data will be bound to it, and old ones will disappear.
ItemDecoration (As the name suggests) should be used to decorate view items of the RecyclerView. If RV OnBindView is taking a long time, verify that you`re doing minimal work in your bind code. Every field that`s stored in the database needs to be either public or have a "getter" method.
If possible, merge view types where reasonable - if only an icon, color, or piece of text changes between types, you can make that change at bind time, and avoid inflation (reducing your app`s memory footprint at the same time). The layout manager then binds the view holder to its data.
In the above snippet, if my post is tagged with Android, RecyclerView, CardView, the output will be the list of tag, separated by a comma, with the link to archive pages of the tags(there is however no link here). RecyclerView includes built-in animations for item add and remove.
To avoid that we use Facebook`s Device Year Class library to detect old devices and simply don`t run the flip animation on those devices by directly calling adapter.notifyDataSetChanged(). As the user scrolls through the list, the RecyclerView takes the off-screen views and rebinds them to the data which is scrolling onto the screen.
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