如何以編程方式更改RecyclerView中項目的位置？

Question

有沒有辦法使用LinearLayoutManager以編程方式將特定項目移動到RecyclerView中的特定位置？

Answer 1

你可以這樣做：

一些活動/片段/不管：

List<String> dataset = new ArrayList<>(); 
RecyclerView recyclervSomething; 
LinearLayoutManager lManager; 
MyAdapter adapter; 

//populate dataset, instantiate recyclerview, adapter and layoutmanager 

recyclervSomething.setAdapter(adapter); 
recyclervSomething.setLayoutManager(lManager); 

adapter.setDataset(dataset); 

MyAdapter：

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> { 
    private List<String> dataset; 
    public MyAdapter() {} 
    //implement required methods, extend viewholder class... 

    public void setDataset(List<String> dataset) { 
     this.dataset = dataset; 
     notifyDataSetChanged(); 
    } 

    // Swap itemA with itemB 
    public void swapItems(int itemAIndex, int itemBIndex) { 
     //make sure to check if dataset is null and if itemA and itemB are valid indexes. 
     String itemA = dataset.get(itemAIndex); 
     String itemB = dataset.get(itemBIndex); 
     dataset.set(itemAIndex, itemB); 
     dataset.set(itemBIndex, ItemA); 

     notifyDataSetChanged(); //This will trigger onBindViewHolder method from the adapter. 
    } 
}