获取屏幕上的位置以便在查看持有者中查看

Question

我有一个由适配器管理的RecyclerView。对于回收站中的每个物品，我都会对复杂的视图进行充气，该视图还包含一个水平进度条，该进度条将占用整个屏幕宽度。

我必须将百分比值（20％，60％等）指向进度条的气泡文本视图定位为进度量的指标。我尝试使用此代码

int[] startPosition = new int[2]; 
Integer progresswidth; 
WindowManager wm = (WindowManager) contextthis.getSystemService(Context.WINDOW_SERVICE); 
Display display = wm.getDefaultDisplay(); 
Point size = new Point(); 
display.getSize(size); 
progresswidth = size.x; 
holder.horiz_progress.getLocationOnScreen(startPosition); 
float exactvalue = (progresswidth * currentitem.getMatchPercent())/100; 
startPosition[0] = startPosition[0] + Math.round(exactvalue); 
startPosition[0] = startPosition[0] - holder.baloon_txt.getWidth()/3 ; 
startPosition[1] = startPosition[1] + 10; 
holder.baloon_txt.setX(startPosition[0]); 
holder.baloon_txt.setY(startPosition[1]); 

但问题是，holder.horiz_progress.getLocationOnScreen总是返回0，所以我不能定位balloon_txt。 我在一个活动内有类似的问题，我解决它重写OnWindowFocusChanged，但这是在适配器内，所以我不知道如何完成它。

编辑

我当前的适配器代码：

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

private List<ResultsItem> mResults; 
private View mSelectedView; 
private int mSelectedPosition; 
Context contextthis; 
android.os.Handler handler; 
int[] startPosition = new int[2]; 

public ResultsAdapter(Context context,List<ResultsItem> resultsItemList) { 
    this.mResults = resultsItemList; 
    contextthis = context; 
} 

@Override 
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.results_item, null); 
    final ViewHolder viewHolder = new ViewHolder(v); 

    viewHolder.results_likeimg.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
     } 
    }); 

    return viewHolder; 
} 

@Override 
public void onBindViewHolder(final ViewHolder holder, int position) { 
    final ResultsItem currentitem = mResults.get(position); 
    //set Image 
    if(currentitem.getImageslist().get(0).getPicture() != null) 
     ImageLoader.getInstance().displayImage(currentitem.getImageslist().get(0).getPicture(), holder.results_img); 

    //baloon set 
    holder.baloon_txt.setText(currentitem.getMatchPercent() + "% " + "Match"); 
    holder.horiz_progress.setProgress(currentitem.getMatchPercent()); 
    final View view = holder.horiz_progress; 
      view.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { 
     @Override 
     public void onGlobalLayout() { 
      view.getLocationOnScreen(startPosition); 
      Integer progresswidth; 
      WindowManager wm = (WindowManager) contextthis.getSystemService(Context.WINDOW_SERVICE); 
      Display display = wm.getDefaultDisplay(); 
      Point size = new Point(); 
      display.getSize(size); 
      progresswidth = size.x; 
      float exactvalue = (progresswidth * currentitem.getMatchPercent())/100; 
      startPosition[0] = startPosition[0] + Math.round(exactvalue); 
      startPosition[0] = startPosition[0] - holder.baloon_txt.getWidth()/3 ; 
      startPosition[1] = startPosition[1] + 10; 
      holder.baloon_txt.setX(startPosition[0]); 
      holder.baloon_txt.setY(startPosition[1]); 
     } 
    }); 


    //logo 
    if(currentitem.getPriceslist().get(0).getSource() != null) 
     ImageLoader.getInstance().displayImage(currentitem.getPriceslist().get(0).getSource(), holder.results_logo_img); 

    //description 
    holder.description_txt.setText(currentitem.getDescription()); 

    //price 
    holder.price_curr.setText(currentitem.getPriceslist().get(0).getCurrency()); 
    holder.price_txt.setText(String.valueOf(currentitem.getPriceslist().get(0).getPrice())); 
} 

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

public static class ViewHolder extends RecyclerView.ViewHolder { 

    ImageView results_img, results_dislikeimg, results_likeimg, results_logo_img; 
    ProgressBar horiz_progress; 
    TextView baloon_txt, price_txt, description_txt, buybtn, sharebtn, price_curr; 

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

     this.results_img = (ImageView) view.findViewById(R.id.resultsitem_img); 
     this.results_dislikeimg = (ImageView) view.findViewById(R.id.results_item_dislike); 
     this.results_likeimg = (ImageView) view.findViewById(R.id.resultsitem_like); 
     this.results_logo_img = (ImageView) view.findViewById(R.id.logoimg); 
     this.horiz_progress = (ProgressBar) view.findViewById(R.id.progressBar_horizontal); 
     this.baloon_txt = (TextView) view.findViewById(R.id.baloonMatch_txt); 
     this.price_txt = (TextView) view.findViewById(R.id.price_txt); 
     this.description_txt = (TextView) view.findViewById(R.id.description_txt); 
     this.buybtn = (TextView) view.findViewById(R.id.buybtn); 
     this.sharebtn = (TextView) view.findViewById(R.id.sharebtn); 
     this.price_curr = (TextView) view.findViewById(R.id.price_curr); 

    } 
} 

}

Answer 1

的getLocation（），因为鉴于尚未制定了尚未返回0。您需要设置布局侦听器：

final View view = holder.horiz_progress; 
view.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { 

    @Override 
    public void onGlobalLayout() { 
     // Do what you need to do here. 
     // Then remove the listener: 
     view.getViewTreeObserver().removeOnGlobalLayoutListener(this); 
    } 

});