PopupWindow使用

    private void showMom() {        if (pop.isShowing()) {            pop.dismiss();        } else {            //位于控件下面            pop.showAsDropDown(view, ScreenUtils.getScreenWidth(context), 100); //titleBar 正下方            //屏幕位置//            pop.showAtLocation(view, Gravity.BOTTOM, 0, 0);            //实例化一个ColorDrawable颜色为半透明            ColorDrawable dw = new ColorDrawable(0x00000000);            //设置SelectPicPopupWindow弹出窗体的背景            pop.setBackgroundDrawable(dw);//            CommUtil.backgroundAlpha(ProjectionSonActivity.this, 0.5f);//0.0-1.0//            pop.setOnDismissListener(new PopupWindow.OnDismissListener() {//                @Override//                public void onDismiss() {//                    // TODO Auto-generated method stub//                    CommUtil.backgroundAlpha(ProjectionSonActivity.this, 1f);//                }//            });        }    }    private View view;    private PopupWindow pop;    //弹出滚动条    private void initPopupWindow() {        view = this.getLayoutInflater().inflate(R.layout.projec_popuw, null);        pop = new PopupWindow(view, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, true);        //获取屏幕的宽度        int w = this.getWindowManager().getDefaultDisplay().getWidth();//        pop.setWidth(w - 40);        pop.setFocusable(true);// 加上这个popupwindow中的ListView才可以接收点击事件        //实例化一个ColorDrawable颜色为半透明        ColorDrawable dw = new ColorDrawable(0x00000000);        pop.setBackgroundDrawable(dw);// 设置背景图片，不能在布局中设置，要通过代码来设置        pop.setOutsideTouchable(true);// 触摸popupwindow外部，popupwindow消失。这个要求你的popupwindow要有背景图片才可以成功    }

/** * 设置添加屏幕的背景透明度 * * @param bgAlpha */public static void backgroundAlpha(Activity context, float bgAlpha) {    WindowManager.LayoutParams lp = context.getWindow().getAttributes();    lp.alpha = bgAlpha;    context.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);    context.getWindow().setAttributes(lp);}