popwindow在Activity中报错

在Activity中使用popwindow不能使用不同的方法初始化popwindow中的控件

必须要使用：

contentView = LayoutInflater.from(this).inflate(R.layout.carepeople_add, null);  

yes_bt = (Button) contentView.findViewById(R.id.add_ok_bt);

不然在对控件进行操作或监听时会报错

具体使用方法如下，

<span style="font-size:18px;"></span>

//添加界面popwindow控件


<span style="white-space:pre">		</span>contentView = LayoutInflater.from(this).inflate(R.layout.carepeople_add, null);    
<span style="white-space:pre">		</span>mPopWindow = new PopupWindow(contentView,    
<span style="white-space:pre">				</span>LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, true);   


<span style="white-space:pre">		</span>phoneNumber_et = (EditText) contentView.findViewById(R.id.add_phoneNumber);
<span style="white-space:pre">		</span>city_et = (EditText) contentView.findViewById(R.id.add_city);
<span style="white-space:pre">		</span>message_et = (EditText) contentView.findViewById(R.id.add_message);
<span style="white-space:pre">		</span>yes_bt = (Button) contentView.findViewById(R.id.add_ok_bt);