android仿新闻阅读器菜单弹出效果实例（附源码DEMO下载）

public class MyAdapter extends BaseAdapter { 
  LayoutInflater inflater = null; 
  Activity activity; 
  ArrayList<News> newslist; 
  private PopupWindow popupWindow; 
 
  public MyAdapter(Activity activity, ArrayList<News> newslist) { 
    this.activity = activity; 
    this.newslist = newslist; 
    inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    initPopWindow(); 
  } 
 
  @Override 
  public int getCount() { 
    return newslist != null ? newslist.size() : 0; 
  } 
 
  @Override 
  public News getItem(int position) { 
    if (newslist != null && newslist.size() != 0) { 
      return newslist.get(position); 
    } 
    return null; 
  } 
 
  @Override 
  public long getItemId(int position) { 
    return position; 
  } 
 
  @Override 
  public View getView(final int position, View convertView, ViewGroup parent) { 
    View vi = convertView; 
    final ViewHolder holder; 
    if (vi == null) { 
      vi = inflater.inflate(R.layout.listview_item, null); 
      holder = new ViewHolder(); 
      holder.item_title = (TextView) vi.findViewById(R.id.item_title); 
      holder.item_content = (TextView) vi.findViewById(R.id.item_content); 
      holder.button_showpop = (ImageView) vi.findViewById(R.id.button_showpop); 
      vi.setTag(holder); 
    } else { 
      holder = (ViewHolder) vi.getTag(); 
    } 
    News news = getItem(position); 
    holder.item_title.setText(news.getTitle()); 
    holder.item_content.setText(news.getContent()); 
    holder.button_showpop .setOnClickListener(new popAction(position)); 
    return vi; 
  } 
 
  public class ViewHolder { 
    TextView item_title; 
    TextView item_content; 
    ImageView button_showpop; 
  } 
   
  /** 
   * 初始化popWindow 
   * */ 
  private void initPopWindow() { 
    View popView = inflater.inflate(R.layout.listview_pop, null); 
    popupWindow = new PopupWindow(popView, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 
    popupWindow.setBackgroundDrawable(new ColorDrawable(0)); 
    //设置popwindow出现和消失动画 
    popupWindow.setAnimationStyle(R.style.PopMenuAnimation); 
    btn_pop_close = (ImageView) popView.findViewById(R.id.btn_pop_close); 
  } 
   
  /** popWindow 关闭按钮 */ 
  private ImageView btn_pop_close; 
   
  /** 
   * 显示popWindow 
   * */ 
  public void showPop(View parent, int x, int y,int postion) { 
    //设置popwindow显示位置 
    popupWindow.showAtLocation(parent, 0, x, y); 
    //获取popwindow焦点 
    popupWindow.setFocusable(true); 
    //设置popwindow如果点击外面区域，便关闭。 
    popupWindow.setOutsideTouchable(true); 
    popupWindow.update(); 
    if (popupWindow.isShowing()) { 
       
    } 
    btn_pop_close.setOnClickListener(new OnClickListener() { 
      public void onClick(View paramView) { 
        popupWindow.dismiss(); 
      } 
    }); 
  } 
   
  /** 
   * 每个ITEM中more按钮对应的点击动作 
   * */ 
  public class popAction implements OnClickListener{ 
    int position; 
    public popAction(int position){ 
      this.position = position; 
    } 
    @Override 
    public void onClick(View v) { 
      int[] arrayOfInt = new int[2]; 
      //获取点击按钮的坐标 
      v.getLocationOnScreen(arrayOfInt); 
      int x = arrayOfInt[0]; 
      int y = arrayOfInt[1]; 
      showPop(v, x , y, position); 
    } 
  } 
}