CymChad/BaserecyclerViewAdapterhelper framework
CymChad/BaserecyclerViewAdapterhelper framework
introduction:
CymChad/BaserecyClerViewAdapterhelper (hereinafter referred to as Brvah) is a powerful ReyclerView expansion library. It provides many convenient functions and practical methods, which greatly simplifies the use of recyclerView.However, performance problems may become a challenge when dealing with a large amount of data or complex layout.This article will introduce some methods to optimize the performance of BRVAH to help developers make better use of the framework.
1. Use Diffutil to update the data set:
When the dataset changes, we need to update the display of RecyclerView.BRVAH provides the Diffutil tool class that can efficiently calculate the difference between the two data sets and update the display display of RecyclerView.By using Diffutil, we can avoid unnecessary refresh and re -drawing to improve performance and user experience.
Example code:
List<Item> oldData = mAdapter.getData();
List<Item> newData = generateNewData();
DiffUtil.DiffResult diffResult = DiffUtil.calculateDiff(new MyDiffCallback(oldData, newData));
mAdapter.setNewData(newData);
diffResult.dispatchUpdatesTo(mAdapter);
class MyDiffCallback extends DiffUtil.Callback {
// The method of implementing disfutil.callback, compare whether the two Item objects are equal
...
}
2. Reasonable use of the cache:
BRVAH provides better performance through the ViewHolder cache mechanism.When RecyclerView rolled, Brvah reuses the ViewHolder object outside the visible area, reducing unnecessary ViewHolder creation and destruction operations.Developers can balance memory and performance by setting the cache size.
Example code:
RecyclerView recyclerView = findViewById(R.id.recyclerView);
RecyclerView.setITEMViewCacheSize (10); // Set the cache size of 10 ViewHolder
RecyclerView.SethasfixEdsize (TRUE); // Set the size fixing of RecyclerView
3. Avoid using complex layout:
Complex layouts may lead to decreased performance of drawing and measurement.When designing layout, try to avoid excessive layout levels and complex layout structures.You can use good layouts such as ConstraintLayout to optimize the layout structure.
Example code:
<androidx.constraintlayout.widget.ConstraintLayout
...
>
<TextView
...
/>
<ImageView
...
/>
...
</androidx.constraintlayout.widget.ConstraintLayout>
4. Lazy loading data:
When RecyclerView contains a lot of data, loading all data at one time may cause the problem of memory overflow or stuttering.You can use lazy loading to load data on demand to optimize performance.
Example code:
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
int visibleItemCount = recyclerView.getChildCount();
int totalItemCount = recyclerView.getLayoutManager().getItemCount();
int firstVisibleItemPosition = ((LinearLayoutManager) recyclerView.getLayoutManager()).findFirstVisibleItemPosition();
if (visibleItemCount + firstVisibleItemPosition >= totalItemCount) {
// Load more data
}
}
});
in conclusion:
The BRVAH framework provides many convenient functions and methods for RecyclerView, which can greatly simplify the use of RecyclerView.Optimization performance is a necessary step when dealing with a large amount of data or complex layout.By using Diffutil for data set updates, rational use of cache, avoiding complex layouts, and lazy loading data, developers can improve the performance of the BRVAH framework and improve user experience.
