Android supports advanced feature introduction to the RecyclerView framework

Android supports advanced feature introduction to the RecyclerView framework RecyclerView is one of the interface card layout controls commonly used in Android development. It provides a more flexible way to display and process long list data.In addition to the basic list display function, RecyclerView also provides some advanced features, enabling developers to better optimize the interaction and user experience of the interface. 1. LayoutManager RecyclerView uses the layout manager to control the arrangement of the list item.The Android system provides three commonly used layout managers by default: LinearlayoutManager: arranges the list items vertically or horizontally. GridLayoutManager: arranges the table item in the form of a grid. Waterfall stream layout manager (StaggeredGridLayoutManager): arranges the list item in the irregular waterfall flow. Developers can also customize the layout manager to meet specific arrangements. // Create a linear layout manager and set the direction to be vertical LinearLayoutManager layoutManager = new LinearLayoutManager(this); layoutManager.setOrientation(LinearLayoutManager.VERTICAL); // Apply the layout manager to RecyclerView recyclerView.setLayoutManager(layoutManager); 2. Adapter (adapter) RecyclerView needs to use a adapter to bind the data to the list item.The adapter is responsible for creating, modifying, and binding the view items, as well as operations such as clicks and data refreshing of the table items.Developers can customize the adapter according to their needs. public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> { private List<String> dataList; public MyAdapter(List<String> dataList) { this.dataList = dataList; } // Create ViewHolder and bind the list layout @NonNull @Override public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { LayoutInflater inflater = LayoutInflater.from(parent.getContext()); View itemView = inflater.inflate(R.layout.item_layout, parent, false); return new ViewHolder(itemView); } // Bind data to the list item view @Override public void onBindViewHolder(@NonNull ViewHolder holder, int position) { String data = dataList.get(position); holder.textView.setText(data); } // Return to the number of columns @Override public int getItemCount() { return dataList.size(); } // Custom ViewHolder, reference to holding the list item view class ViewHolder extends RecyclerView.ViewHolder { TextView textView; public ViewHolder(@NonNull View itemView) { super(itemView); textView = itemView.findViewById(R.id.text_view); } } } // Apply the adapter to RecyclerView MyAdapter adapter = new MyAdapter(dataList); recyclerView.setAdapter(adapter); 3. Divider RecyclerView supports custom segmentation lines to beautify the interval between the list items.It can be implemented by defining ItemDecoration and applying it to RecyclerView. // Customized segmentation line public class DividerItemDecoration extends RecyclerView.ItemDecoration { private Drawable divider; public DividerItemDecoration(Context context) { divider = ContextCompat.getDrawable(context, R.drawable.divider); } @Override public void onDraw(@NonNull Canvas canvas, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) { int left = parent.getPaddingLeft(); int right = parent.getWidth() - parent.getPaddingRight(); int childCount = parent.getChildCount(); for (int i = 0; i < childCount; i++) { View child = parent.getChildAt(i); RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams(); int top = child.getBottom() + params.bottomMargin; int bottom = top + divider.getIntrinsicHeight(); divider.setBounds(left, top, right, bottom); divider.draw(canvas); } } } // Apply the segmentation line to RecyclerView DividerItemDecoration itemDecoration = new DividerItemDecoration(this); recyclerView.addItemDecoration(itemDecoration); 4. Drag and Drop RecyclerView supports the function of sorting by dragging the list item.You can process the related operations of dragging sort by defining itemtouchHelper.Callback. ItemTouchHelper itemTouchHelper = new ItemTouchHelper(new ItemTouchHelper.Callback() { @Override public int getMovementFlags(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder) { // Set the direction to drag the direction int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN; return makeMovementFlags(dragFlags, 0); } @Override public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) { // Processing the movement of the list item int fromPosition = viewHolder.getAdapterPosition(); int toPosition = target.getAdapterPosition(); Collections.swap(dataList, fromPosition, toPosition); adapter.notifyItemMoved(fromPosition, toPosition); return true; } @Override public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) { // Process the sliding deletion operation of the list item int position = viewHolder.getAdapterPosition(); dataList.remove(position); adapter.notifyItemRemoved(position); } }); // Apply ItemtouchHelper to Recyclerview itemTouchHelper.attachToRecyclerView(recyclerView); The above is some of the advanced features of the RecyclerView framework. By using different layout managers, adaptors, segmentation lines, and drag sorting functions, you can more flexibly achieve various complex list display effects and interactive operations.