popupWindow 在指定位置上的显示

先看效果图，免得浪费大家时间，看是不是想要的效果 。

直接上代码 ，核心方法。

private void showPopupWindow(View parent) {
        if (popupWindow == null) {
            LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = layoutInflater.inflate(R.layout.group_list, null);
            lv_group = (ListView) view.findViewById(R.id.lvGroup);

            Collections.reverse(groups);
            GroupAdapter groupAdapter = new GroupAdapter(this, groups);
            lv_group.setAdapter(groupAdapter);
            popupWindow = new PopupWindow(view, 200, 220);
        }
        popupWindow.setFocusable(true);
        popupWindow.setOutsideTouchable(true);
        // 这个是为了点击“返回Back”也能使其消失，并且并不会影响你的背景
        popupWindow.setBackgroundDrawable(new BitmapDrawable());
        WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
        int xPos = -popupWindow.getWidth() / 2
                + getCustomTitle().getCenter().getWidth() / 2;

        popupWindow.showAsDropDown(parent, xPos, 4);

        lv_group.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view,
                    int position, long id) {
                loadNew(((StringItem)(groups.get(position))).getId());
                if (popupWindow != null)
                    popupWindow.dismiss();
            }
        });
    }

这篇是转载的 。

popupWindow 在控件的各个方向上的显示（上、下、左、右），主要用到popupWindow 的showAtLocation(）方法：

在控件的上方：

private void showPopUp(View v) {
        LinearLayout layout = new LinearLayout(this);
        layout.setBackgroundColor(Color.GRAY);
        TextView tv = new TextView(this);
        tv.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
        tv.setText("I'm a pop -----------------------------!");
        tv.setTextColor(Color.WHITE);
        layout.addView(tv);

        popupWindow = new PopupWindow(layout,120,120);

        popupWindow.setFocusable(true);
        popupWindow.setOutsideTouchable(true);
        popupWindow.setBackgroundDrawable(new BitmapDrawable());

        int[] location = new int[2];
        v.getLocationOnScreen(location);

        popupWindow.showAtLocation(v, Gravity.NO_GRAVITY, location[0], location[1]-popupWindow.getHeight());
    }

在控件的其他方向上显示只需修改最后一行代码即可，如：

下方：popupWindow.showAsDropDown(v);

左边：

popupWindow.showAtLocation(v, Gravity.NO_GRAVITY, location[0]-popupWindow.getWidth(), location[1]);

右边：

popupWindow.showAtLocation(v, Gravity.NO_GRAVITY, location[0]+v.getWidth(), location[1]);