Android PopupWindow居中显示

• 摘要：要实现的效果图:方法一:showAsDropDownprivatevoidshowChoose(){DisplayMetricsdm=newDisplayMetrics();getActivity().getWindowManager().getDefaultDisplay().getMetrics(dm);intscreenHeight=dm.heightPixels;LayoutInflatermLayoutInflater=(LayoutInflater)getActi

• 要实现的效果图:

  
  

  

  
  

  方法一:showAsDropDown

  
  private void showChoose() { 
  DisplayMetrics dm = new DisplayMetrics(); 
  getActivity().getWindowManager().getDefaultDisplay().getMetrics(dm); 
  int screenHeight =dm.heightPixels; 
  LayoutInflater mLayoutInflater = (LayoutInflater) getActivity().getSystemService(LAYOUT_INFLATER_SERVICE); 
  ViewGroup menuView = (ViewGroup) mLayoutInflater.inflate( 
  R.layout.view_choose_photo_video, null, true); 
  PopupWindow pw = new PopupWindow(menuView, ViewGroup.LayoutParams.MATCH_PARENT, 
  ViewGroup.LayoutParams.WRAP_CONTENT, true); 
  pw.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT)); 
  pw.setOutsideTouchable(false); // 设置是否允许在外点击使其消失,到底有用没? 
  pw.setAnimationStyle(R.style.nornal_style); // 设置动画 
  // 将pixels转为dip 
  int xoffInDip = ScreenTools.getInstance().pxTodip(screenHeight); 
  FrameLayout frameLayout = findView(R.id.nav_title_bar); 
  pw.showAsDropDown(frameLayout, 0, xoffInDip); 
  //添加pop窗口关闭事件 
  pw.setOnDismissListener(new poponDismissListener()); 
  backgroundAlpha(0.5f); 
  } 
  

  整个窗体设置透明度方法

  
  public void backgroundAlpha(float bgAlpha) { 
  WindowManager.LayoutParams lp = getActivity().getWindow().getAttributes(); 
  lp.alpha = bgAlpha; //0.0-1.0 
  getActivity().getWindow().setAttributes(lp); 
  } 
  

  如果对屏幕像素与dp不太清楚者,查看https://my.oschina.net/yuerliang/blog/796468

  
  

  像素转换成dp实现类

  
  public class ScreenTools { 
  private static ScreenTools mScreenTools; 
  private Context mContext; 
  private ScreenTools(Context mContext) { 
  this.mContext = mContext; 
  } 
  public static ScreenTools getInstance() { 
  if (mScreenTools == null) { 
  mScreenTools = new ScreenTools(ControlApplication.context()); 
  } 
  return mScreenTools; 
  } 
  /** 
  * 根据手机的分辨率从 px(像素) 的单位 转成为 dp 
  */ 
  public int pxTodip(float pxValue) { 
  final float scale = mContext.getResources().getDisplayMetrics().density; 
  return (int) (pxValue / scale + 0.5f); 
  } 
  } 
  

  方法二:showAtLocation

  
  private void showChoose() { 
  LayoutInflater mLayoutInflater = (LayoutInflater) getActivity().getSystemService(LAYOUT_INFLATER_SERVICE); 
  ViewGroup menuView = (ViewGroup) mLayoutInflater.inflate( 
  R.layout.view_choose_photo_video, null, true); 
  PopupWindow pw = new PopupWindow(menuView, ViewGroup.LayoutParams.MATCH_PARENT, 
  ViewGroup.LayoutParams.WRAP_CONTENT, true); 
  pw.setOutsideTouchable(true); // 设置是否允许在外点击使其消失,到底有用没? 
  pw.setFocusable(true); 
  pw.setAnimationStyle(R.style.nornal_style); // 设置动画 
  // 计算x轴方向的偏移量,使得PopupWindow在Title的正下方显示,此处的单位是pixels 
  backgroundAlpha(0.5f); 
  FrameLayout frameLayout = findView(R.id.fragment_circle); 
  //方法二 
  pw.showAtLocation(frameLayout, Gravity.CENTER,0,0); 
  //添加pop窗口关闭事件监听 
  pw.setOnDismissListener(new poponDismissListener()); 
  }