Question

我正在尝试从我的适配器获取一些数据但没有成功。我在我的主要活动功能中获得了一些项目位置，需要从该项目中获取项目名称。我可以弄清楚如何实现这一目标。如果有人可以帮我修理它，我会很高兴。

我的主要活动的功能 -

        public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
            int position = viewHolder.getAdapterPosition();

            if (direction == ItemTouchHelper.LEFT) {
                Log.e(TAG, RecyclerAdapter.getIdFromPosition(position)); // Here what I try to do but to achieve that the getIdFromPosition
                                                                            function need to be static and I can do this function to be static 
            } else {
                Log.e(TAG,"Right");
            }
        }

适配器功能 -

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {

List<Task> data= Collections.emptyList();

public RecyclerAdapter(MainActivity mainActivity, List<Task> data) {
    this.data = data;
}


@Override
public RecyclerAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
    View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_list, viewGroup, false);
    return new ViewHolder(view);
}

@Override
public void onBindViewHolder(ViewHolder holder, int position) {

    Task current = data.get(position);

    //holder.tv1.setText(name[position]);
    ViewHolder.tv2.setText(current.data);
    if(current.sync != "null"){
        holder.tv1.setText("A");
    }
    holder.imageView.setTag(holder);
}

@Override
public int getItemCount() {
    return data.size();
}

public void getIdFromPosition(int position){
    Log.e(TAG, data.get(position).getId());
}

public static class ViewHolder extends RecyclerView.ViewHolder{
    public TextView tv1;
    public static TextView tv2;
    public ImageView imageView;

    public ViewHolder(View view) {
        super(view);

         tv1 = (TextView) view.findViewById(R.id.list_title);
         tv2 = (TextView)view.findViewById(R.id.list_desc);
         imageView = (ImageView) view.findViewById(R.id.list_avatar);

        view.setOnClickListener(new View.OnClickListener() {
            @Override public void onClick(View v) {
                //Log.e("test","test");
            }
        });

    }
}

Answer 1

public interface RecyclerClick {
    void onClick(Object o);
}

现在将接口添加为适配器构造函数中的参数：

public RecyclerAdapter(MainActivity mainActivity, List<Task> data, RecyclerClick click) {
   this.data = data;
   this.click = click;
}

在视图内，调用onClick：

view.setOnClickListener(new View.OnClickListener() {
        @Override public void onClick(View v) {
            //Log.e("test","test");
            //Pass any object u want
            click.onClick(current);
        }
    });

在主活动中实现此接口并传递this作为适配器构造函数的参数：

adapter = new RecyclerAdapter(this, data, this);

现在，主要活动中的onClick方法将在每次点击时调用所需的数据/对象。

Answer 2

要实现RecyclerView的滑动，您需要在托管ItemTouchHelper.SimpleCallback适配器的活动或片段中实施RecyclerView：

这样的事情：

ItemTouchHelper touchHelper = new ItemTouchHelper(
 new ItemTouchHelper.SimpleCallback(ItemTouchHelper.LEFT) {

     @Override
     public abstract boolean onMove(RecyclerView recyclerView,
         ViewHolder viewHolder, ViewHolder target) {

         return true;// true if moved, false otherwise
     }

     @Override
     public void onSwiped(ViewHolder viewHolder, int direction) {
         int position = viewHolder.getAdapterPosition();
         MyData dataObj = myDataList.get(position);
         // execute whatever you choose to here. 
     }
});

然后，当您设置RecyclerView时，请附上ItemTouchHelper：

touchHelper.attachToRecyclerView(yourRecyclerView);

将数据从适配器返回到功能

2 个答案: