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在Android中,滑动控件的滑动逻辑和无限滚动的优化实现可以通过自定义View或使用现有的库来实现。这里我们将介绍如何实现一个简单的无限滚动的RecyclerView。
public class InfiniteScrollLinearLayoutManager extends LinearLayoutManager {
public InfiniteScrollLinearLayoutManager(Context context) {
super(context);
}
public InfiniteScrollLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {
super(context, orientation, reverseLayout);
}
public InfiniteScrollLinearLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
}
public class InfiniteScrollAdapter extends RecyclerView.Adapter<InfiniteScrollAdapter.ViewHolder> {
private List<String> data;
public InfiniteScrollAdapter(List<String> data) {
this.data = data;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_infinite_scroll, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
holder.textView.setText(data.get(position % data.size()));
}
@Override
public int getItemCount() {
return Integer.MAX_VALUE;
}
public static class ViewHolder extends RecyclerView.ViewHolder {
TextView textView;
public ViewHolder(@NonNull View itemView) {
super(itemView);
textView = itemView.findViewById(R.id.textView);
}
}
}
RecyclerView recyclerView = findViewById(R.id.recyclerView);
InfiniteScrollLinearLayoutManager layoutManager = new InfiniteScrollLinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
List<String> data = new ArrayList<>();
for (int i = 0; i < 10; i++) {
data.add("Item " + i);
}
InfiniteScrollAdapter adapter = new InfiniteScrollAdapter(data);
recyclerView.setAdapter(adapter);
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
int firstVisibleItemPosition = layoutManager.findFirstVisibleItemPosition();
if (firstVisibleItemPosition > data.size() * 2) {
recyclerView.scrollToPosition(data.size());
}
}
});
这样,我们就实现了一个简单的无限滚动的RecyclerView。你可以根据需要对其进行扩展和优化。
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