1.首先自定义PopupWindow

   popWindowView= LinearLayout.inflate(context, R.layout.popupWindow,null);

   popupWindow = new PopupWindow(popWindowView, LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT, true);

   popupWindow.setOutsideTouchable(true);//点击弹窗以外的地方消失

   popupWindow.setBackgroundDrawable(new BitmapDrawable());//响应返回键

2.一般我们会让弹出框在我们指定控件的某个位置展示，那么就有如下计算

             /**

* @param anchorView  弹窗时作为参照物的view     * @param contentView   内容布局（可以直接放popupWindow）     * @return 左上角的x,y坐标     */    private static int[] PopViewPos(final View anchorView, final View contentView) {        final int windowPos[] = new int[2];        final int anchorLoc[] = new int[2];　　　　 // 获取锚点View在屏幕上的左上角坐标位置,赋值给anchorLoc数组        anchorView.getLocationOnScreen(anchorLoc);         //获取参照view的高度        final int anchorHeight = anchorView.getHeight();        // 获取屏幕的高宽        final int screenHeight = ScreenUtils.getScreenHeight(anchorView.getContext());        final int screenWidth = ScreenUtils.getScreenWidth(anchorView.getContext());         //设置测量模式，让父容器不影响view的测量        contentView.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);        // 计算contentView的高宽        final int windowHeight = contentView.getMeasuredHeight();        final int windowWidth = contentView.getMeasuredWidth();        // 判断需要向上弹出还是向下弹出显示        final boolean isNeedShowUp = (screenHeight - anchorLoc[1] - anchorHeight < windowHeight);        if (isNeedShowUp) {            windowPos[0] = screenWidth - windowWidth;            windowPos[1] = anchorLoc[1] - windowHeight;        } else {            windowPos[0] = screenWidth - windowWidth;            windowPos[1] = anchorLoc[1] + anchorHeight;        }        return viewPos;    } 3.显示showAtLoaction int viewPos[] = calculatePopWindowPos(view, contentView); popupwindow.showAtLocation(view, Gravity.TOP | Gravity.START, viewPos[0], viewPos[1]);

/**     * 获取屏幕高度(px)     */    public static int getScreenHeight(Context context) {        return context.getResources().getDisplayMetrics().heightPixels;    }    /**     * 获取屏幕宽度(px)     */    public static int getScreenWidth(Context context) {        return context.getResources().getDisplayMetrics().widthPixels;    }