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Popwindow
没有继承Viewgroup，因此最外层布局属性的宽高无效，如果布局设置wrap_content则以实际资源大小为准，例如：给布局定义背景图片，如果图片是.9格式要特别注意，设置了宽高后会默认加上没有被拉升的部分宽高。
Popwindow 显示方法有两种，即显示在某个view下和显示在窗体中的某个xy位置，如果设置了比重，Gravity.END|Gravity.TOP
此时从上到下，从右到左的偏移量为正。
public class Pop extends PopupWindow { private View conentView; public Pop(
final Activity context) { LayoutInflater inflater = (LayoutInflater) context .
getSystemService(Context.LAYOUT_INFLATER_SERVICE); conentView = inflater.inflate
(R.layout.pop_task, null); int h = context.getWindowManager().getDefaultDisplay(
).getHeight(); int w = context.getWindowManager().getDefaultDisplay().getWidth()
; // 设置SelectPicPopupWindow的View this.setContentView(conentView); //
设置SelectPicPopupWindow弹出窗体的宽 this.setWidth((int)context.getResources().
getDimension(R.dimen.px_to_dp_232)); // 设置SelectPicPopupWindow弹出窗体的高 this.
setHeight(ViewGroup.LayoutParams.WRAP_CONTENT); // 设置SelectPicPopupWindow弹出窗体可点击
this.setFocusable(true); this.setOutsideTouchable(true); // 刷新状态 this.update();
// 实例化一个ColorDrawable颜色为半透明 ColorDrawable dw = new ColorDrawable(0000000000);
// 点back键和其他地方使其消失,设置了这个才能触发OnDismisslistener ，设置其他控件变化等操作 this.
setBackgroundDrawable(dw); }
