Question

我已经在这篇文章的帮助下以某种方式实现了回收视图，现在我的要求是在此回收视图中从运行时删除一行。

link - http://treyrobinson.net/blog/android-l-tutorials-part-3-recyclerview-and-cardview/

请帮帮我。

感谢。

Answer 1

由于我们不知道你的adaper如何，并且在该链接中给出了信息，你可以在适配器中创建一个删除对象的方法：

public void removeItem(int position) {
       mData.remove(position);
       notifyItemRemoved(position);
}

您可以通过以下活动完成所有这些：

((MyRecyclerAdapter)myRecyclerView.getAdapter()).removeItem(position);

Answer 2

我能够让它像这样工作。

 ItemTouchHelper.SimpleCallback simpleItemTouchCallback = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {
            @Override
            public void onSwiped(RecyclerView.ViewHolder viewHolder, int swipeDir) {
                //Remove swiped item from list and notify the RecyclerView
                datalist.remove(viewHolder.getAdapterPosition());
                // this line animates what happens after delete
                adapter.notifyItemRemoved(viewHolder.getAdapterPosition());
                Snackbar.make(recyclerView, "delete successful", Snackbar.LENGTH_LONG).show();
            }

            @Override
            public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
                return false;
            }
        };

并将上述内容设置为这样的回收站视图。

    ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleItemTouchCallback);
itemTouchHelper.attachToRecyclerView(recyclerView);

Answer 3

我在过去的两天里尝试过同样的事情，最终让它发挥作用。

我的主要问题是如何获取点击视图的位置，以便我们可以将其从适配器中移除？

并且解决方案是在holder.itemView.setTag(model.get(position));中使用onBindViewHolder来存储视图的位置，并使用ViewModel model = (ViewModel) v.getTag();中的onClick()

获取点击后的观看次数

在运行时从RecyclerView删除行的步骤：

创建MainActivity.java

public class MainActivity extends Activity {

    private RecyclerView  recyclerView;
    private RecyclerView.LayoutManager layoutManager;
    private String[] liststring;
    private TypedArray listImages;
    MyRecyclerView adapter;
    List<ViewModel> model;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        liststring=getResources().getStringArray(R.array.listString);
        listImages=getResources().obtainTypedArray(R.array.listImages);


        recyclerView=(RecyclerView) findViewById(R.id.my_recycler_view);
        recyclerView.setHasFixedSize(true);
        layoutManager=new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);
        adapter=new MyRecyclerView(createMockList(),this);
        recyclerView.setAdapter(adapter);
        adapter.setOnItemClickListener(new RecyclerViewItemClickInterface() {

            @Override
            public void onItemclick(View v,ViewModel vModel) {
                // TODO Auto-generated method stub
                Log.i("inflatedlayout", v.getId()+"");
                 adapter.remove(vModel);
            }
        });
        }

     private List<ViewModel> createMockList() {
         List<ViewModel> items = new ArrayList<ViewModel>();
         for (int i = 0; i < 9; i++) {
        items.add(new ViewModel("Item " + (i + 1),listImages.getResourceId(i, -1)));
         }
         return items;
         }
      }

创建MyRecyclerView.java

public class MyRecyclerView extends RecyclerView.Adapter<MyRecyclerView.MyViewHolder> implements View.OnClickListener { String data[]; TypedArray images; MyRecyclerView mv; Activity act_context; RecyclerViewItemClickInterface listener; List<ViewModel> model;

public MyRecyclerView(List<ViewModel> model,Activity act_context) {
    // TODO Auto-generated constructor stub
    this.model=model;
    this.act_context=act_context;
}

public static class MyViewHolder extends ViewHolder{

    private ImageView imageView1;
    private TextView textView1;
    //private IMyViewHolderClicks listener;

    public MyViewHolder(View inflatedView) {
        super(inflatedView);
        // TODO Auto-generated constructor stub         
        textView1=(TextView) inflatedView.findViewById(R.id.textView1);
        imageView1=(ImageView) inflatedView.findViewById(R.id.imageView1);
    }
}

@Override
public int getItemViewType(int position) {
    // TODO Auto-generated method stub
    Log.i("getIemViewTypePosition", ""+position);
    return super.getItemViewType(position);
    }

@Override
public int getItemCount() {
    // TODO Auto-generated method stub
    return model.size();
}

@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
    // TODO Auto-generated method stub

    holder.itemView.setTag(model.get(position));
    holder.imageView1.setImageResource(model.get(position).getImage());
    holder.textView1.setText(model.get(position).gettest());
    Log.i("onBindViewHolder", "called by layoutmanager");
}

@Override
public MyViewHolder onCreateViewHolder(final ViewGroup parent, final int viewType) {
    // TODO Auto-generated method stub
    View v=LayoutInflater.from(act_context).inflate(R.layout.row_layout, parent, false);
    v.setOnClickListener(this);
    MyRecyclerView.MyViewHolder vh = new MyViewHolder(v);
    Log.i("onCreateViewHolder", "ViewHolder created");
    return vh;
}

@Override
public void onClick(View v) {
    // TODO Auto-generated method stub
     if (listener != null) {
         ViewModel model = (ViewModel) v.getTag();
    listener.onItemclick(v,model);}
}

void setOnItemClickListener(RecyclerViewItemClickInterface listener){

    this.listener=listener;
}

public void remove(ViewModel item) {
    int position = model.indexOf(item);
    model.remove(position);
    notifyItemRemoved(position);
    }

}

创建ViewModel.java

public class ViewModel { String test; int image; public ViewModel(String test,int image) { // TODO Auto-generated constructor stub this.test=test; this.image=image; } String gettest(){ return test; } int getImage(){ return image; }}

4.创建interface：

interface RecyclerViewItemClickInterface {

void    onItemclick(View v,ViewModel viewModel);

}

Answer 4

如果你想通过点击删除一行，我认为更简洁的方法是在ViewHolder上实现onClicks。然后在适配器上实现一个公共remove方法，然后通过onCreateViewHolder方法将适配器传递给ViewHolder。

会是这样的：

--- ---实施例

适配器：

public class MyAdapter extends RecyclerView.Adapter<MyViewHolder> {

private List<Object> mDataset; // This is the list of items to be shown    
//Here you would write the rest of your Adapter code

    public myViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        final View itemView = mInflater.inflate(R.layout.item_recyclerview_round, parent, false);
        return new RoundViewHolder(itemView, this);
    }

    public void removeItem(int position) {
        mDataSet.remove(position);
        notifyItemRemoved(position);
        // Add whatever you want to do when removing an Item
    }
}

ViewHolder：

public class MyViewHolder RecyclerView.ViewHolder 
    implements View.OnClickListener {

    private MyAdapter myAdapter;
    // Here you would write the rest of your ViewHolder code

    public MyViewHolder (View itemView, MyAdapter myAdapter){
        super(itemView);
        this.myAdapter = myAdapter;
        // Here you would write the rest of your constructor
    }

    public void onClick(View view) {
        myAdapter.removeItem(getAdapterPosition());
    }

它对我有用。我不知道性能是否可以提高（可能），但这是我找到的最简单的方法。

我希望它有所帮助。

Answer 5

我知道这是迟到的答案，但也许对其他人有帮助。 You don't need to add new delete method in your adapter class。最好的方法是在add interface课程中ViewHolder开始{/ 1}}。

public class ApapterVH extends RecyclerView.ViewHolder implements View.OnClickListener{
    ImageView ivDeleteItem;

    ApapterVH(View itemView) {
        super(itemView);

        ivDeleteItem = itemView.findViewById(R.id.ivDelete);

        itemView.setOnClickListener(this);
        ivDeleteFoodItem.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        if(v.getId() == ivDeleteItem.getId()){
            onItemClickListener.onDelete(v, getAdapterPosition());
        }
        if(onItemClickListener!=null){
            onItemClickListener.onItemClick(v, getAdapterPosition());
        }
    }
}

public interface OnItemClickListener {
    void onItemClick(View view , int position);
    void onDelete(View view, int position);
}

public void SetOnItemClickListener(final OnItemClickListener onItemClickListener){
    this.onItemClickListener = onItemClickListener;
}

然后在你的Activity或Fragment中添加：

 mAdapter.SetOnItemClickListener(new YourAdapter.OnItemClickListener() {
        @Override
        public void onItemClick(View view, int position) {
            //Do something
        }

        @Override
        public void onDelete(View view, int position) {
            mList.remove(position);
            mAdapter.notifyItemRemoved(position);
        }

    });

只有这两行代码才会删除您的项目：

 mList.remove(position);
 mAdapter.notifyItemRemoved(position);

Answer 6

如果上述解决方案无效，请尝试

private fun removeItem(position: Int) {
    items.removeAt(position)
    notifyItemRemoved(position)
    notifyItemRangeChanged(position, itemCount - position)
}

从RecyclerView中删除行

6 个答案: