/** * 設置添加屏幕的背景透明度 * @param bgAlpha */ public void backgroundAlpha(float bgAlpha) {   WindowManager.LayoutParams lp = getWindow().getAttributes();   　　　　lp.alpha = bgAlpha; //0.0-1.0     getWindow().setAttributes(lp); } 

recomPopup = new RecomPopup(mContext);       recomPopup.setShowListener(new RecomPopup.ShowListener() {         @Override         public void show() {           backgroundAlpha(0.6f);         }       });       recomPopup.setDismissListener(new RecomPopup.DismissListener() {         @Override         public void dismiss() {           backgroundAlpha(1f);         }       });       recomPopup.showAtLocation(include_bottom, Gravity.NO_GRAVITY, 0, DevicesInfoUtils.getScreenHeight(mContext) - recomPopup.getHeight()); 

private ShowListener showListener; private DismissListener dismissListener;    @Override   public void showAtLocation(View parent, int gravity, int x, int y) {     super.showAtLocation(parent, gravity, x, y);     if (showListener != null){       showListener.show();     }   }    @Override   public void dismiss() {     super.dismiss();     if (dismissListener != null){       dismissListener.dismiss();     }   }    public void setShowListener(ShowListener showListener) {     this.showListener = showListener;   }    public void setDismissListener(DismissListener dismissListener) {     this.dismissListener = dismissListener;   }    public interface ShowListener{     void show();   }    public interface DismissListener{     void dismiss();   }