將數據從適配器返回到功能

Question

我試圖從我的適配器中獲取一些數據以取得成功。我在我的主要活動功能獲得一些項目的位置，並需要從這個項目的項目名稱。我可以想出如何實現這一點。如果有人能幫我解決問題，我會很高興。從我的主要活動

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"); 
      } 
     } 

適配器功能 -

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); 
} 

現在添加界面在適配器構造函數的參數：

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

而且viewholder內，調用的onClick：

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

並在您的主要活動實現此接口，並通過this作爲適配器構造函數的參數：

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

現在，在方法的onClick您的主要活動將在每次點擊時使用所需的數據/對象進行調用。

Answer 2

要實現刷卡爲RecyclerView需要實現在承載RecyclerView適配器的活動或片段ItemTouchHelper.SimpleCallback：

事情是這樣的：

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. 
    } 
}); 

然後，當你建立你的RecyclerView附加ItemTouchHelper ：

touchHelper.attachToRecyclerView(yourRecyclerView);