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RecyclerView是Android开发中常用的 ViewGroup,用于显示包括大宗数据的虚拟列表。它在性能优化方面体现优异,特别适用于处理大宗数据或庞大视图结构。RecyclerView 的主要优势在于其高效的视图复用机制和可扩展性,通过 ViewHolder 和LayoutManager 的配合,可以灵活地实现种种结构形式。
RecyclerView 的使用流程大致分为以下几个办法:
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
RecyclerView recyclerView = findViewById(R.id recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
MyAdapter adapter = new MyAdapter(dataList);
recyclerView.setAdapter(adapter);
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private List<String> mData;
public MyAdapter(List<String> data) {
mData = data;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_layout, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.textView.setText(mData.get(position));
}
@Override
public int getItemCount() {
return mData.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
TextView textView;
ViewHolder(View itemView) {
super(itemView);
textView = itemView.findViewById(R.id.text_view);
}
}
}
// 笔直排列
recyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
// 网格结构
recyclerView.setLayoutManager(new GridLayoutManager(this, 2));
// 支解线
recyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));
DiffUtil.DiffResult diffResult = DiffUtil.calculateDiff(new MyDiffCallback(oldList, newList));
diffResult.dispatchUpdatesTo(adapter);
public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView textView;
public MyViewHolder(View itemView) {
super(itemView);
textView = itemView.findViewById(R.id.text_view);
}
}
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
// 处理转动事件
}
});
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setEmptyView(emptyView);
RecyclerView 是一个功效强大且灵活的 ViewGroup,掌握其焦点原理和使用要领,可以显著提升Android应用的用户体验和性能体现。
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