получить утилизатор пункт абсолютных координат

Question

Я пытаюсь сделать элементы в recyclerview двигаться при прокрутке вверх или вниз в материи, которая зависит от У-координаты взглядов ребенка. Однако, похоже, я не могу получить координаты детей. Как я могу получить координату Y? Мне нужен он в методе onBindViewHolder, чтобы я мог установить параметр макета детского представления в соответствии с ним.

Answer 1

в вашей деятельности/Fragment:

RecyclerView yourRecyclerView; 
FansAdapter yourRecyclerAdapter; 

........

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    yourRecyclerView = (RecyclerView) findViewById(R.id.recycler_view); 
    yourRecyclerView.setLayoutManager(new LinearLayoutManager(this)); 
    yourRecyclerView.setHasFixedSize(true); 
    yourRecyclerAdapter = new YourAdapter (populateYourList(), this); 
    yourRecyclerView.setAdapter(yourRecyclerAdapter); 
    yourRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() { 
     @Override 
     public void onScrolled(RecyclerView recyclerView, int dx, int dy) { 
      super.onScrolled(recyclerView, dx, dy); 
      View firstVisibleChild = recyclerView.getChildAt(0);//change if necessary. determine that item(items) you need to find 
      final ImageView imageView = (ImageView) firstVisibleChild.findViewById(R.id.item_image); 
      if (null != imageView) { 
      imageView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { 
       @Override 
       public void onGlobalLayout() {   
       int[] locationsFrom = new int[2]; 
       imageView.getLocationInWindow(locationsFrom); 
       int xStart = locationsFrom[0]; 
       int yStart = locationsFrom[1]; 
       Log.d("LOG_TAG", "your item xEnd=" + xStart +" yEnd=" + yStart); 
       if (null != yourRecyclerAdapter) { 
        yourRecyclerAdapter.setX(xStart); 
        yourRecyclerAdapter.setY(yStart); 
       } 
      } 
      } 
     } 
    }); 
} 

@Override 
protected void onDestroy() { 
    super.onDestroy(); 
    if (null != yourRecyclerView) { 
     yourRecyclerView.clearOnScrollListeners(); 
    } 

} 

и адаптер:

public class YourAdapter extends RecyclerView.Adapter<YourAdapter.YouViewHolder> { 

ArrayList<String> fansList; 
Context mContext; 
private int x; 
private int y; 

public YourAdapter(ArrayList<String> fansList, Context context) { 
    this.fansList = fansList; 
    this.mContext = context; 
} 

public void setX(int x) { 
    this.x = x; 
} 

public void setY(int y) { 
    this.y = y; 
} 

@Override 
public YouViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) { 
    if (viewGroup instanceof RecyclerView) { 
     View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.recycle_item_fans, viewGroup, false); 
     view.setFocusable(true); 
     return new YouViewHolder(view); 
    } else { 
     throw new RuntimeException("Not bound to RecyclerView"); 
    } 

} 

@Override 
public void onBindViewHolder(YouViewHolder holder, int position) { 
    holder.itemName.setText(fansList.get(position)); 
    Log.v("LOG_TAG","x="+x+" y="+y);// use y or x 
} 

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


//holder 
public final class YouViewHolder extends RecyclerView.ViewHolder { 

    public final TextView itemName; 
    public final ImageView imageView; 

    public YouViewHolder(View rowView) { 
     super(rowView); 
     this.itemName = (TextView) rowView.findViewById(R.id.text_fan_name); 
     this.imageView = (ImageView) rowView.findViewById(R.id.image_second_free); 
    } 
} 

}