找了很久，终于让我找到了，登陆界面登陆按钮随着输入法键盘的弹出而动态改变

<?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:background="@color/white" >
 
     <LinearLayout
         android:id="@+id/layout_header"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_alignParentTop="true"
         android:background="@drawable/bg_topbar"
         android:focusable="true" />
 
     <LinearLayout
         android:id="@+id/layout_content"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent"
         android:layout_below="@+id/layout_header"
         android:orientation="vertical" >
 
         <ScrollView
             android:layout_width="fill_parent"
             android:layout_height="fill_parent"
             android:layout_weight="1.0"
             android:scrollbars="vertical" >
 
             <LinearLayout
                 android:layout_width="fill_parent"
                 android:layout_height="fill_parent"
                 android:orientation="vertical"
                 android:paddingLeft="10.0dip"
                 android:paddingRight="10.0dip"
                 android:paddingTop="15.0dip" >
 
                 <EditText
                     android:id="@+id/login_et_momoid"
                     android:layout_width="fill_parent"
                     android:layout_height="wrap_content"
                     android:layout_marginBottom="8.0dip"
                     android:background="@drawable/edittext_default"
                     android:inputType="text"
                     android:singleLine="true" />
 
                 <EditText
                     android:id="@+id/login_et_pwd"
                     android:layout_width="fill_parent"
                     android:layout_height="wrap_content"
                     android:layout_marginBottom="8.0dip"
                     android:background="@drawable/edittext_default"
                     android:imeOptions="actionDone"
                     android:inputType="textPassword"
                     android:singleLine="true" />
 
                 <TextView
                     android:id="@+id/login_tv_forgotpassword"
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content"
                     android:clickable="true"
                     android:text="忘记密码？"
                     android:textSize="16.0sp" />
             </LinearLayout>
         </ScrollView>
 
         <RelativeLayout style="@style/Style_BottomBar" >
 
             <Button
                 android:id="@+id/btn_back"
                 style="@style/Style_Login_register_btn"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:layout_alignParentLeft="true"
                 android:text="返回" />
 
             <Button
                 android:id="@+id/btn_ok"
                 style="@style/Style_Login_register_btn"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:layout_alignParentRight="true"
                 android:text="登录" />
         </RelativeLayout>
     </LinearLayout>
 
     <ImageView
         android:id="@+id/layout_shadow"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_below="@id/layout_header"
         android:background="@drawable/bg_topbar_shadow"
         android:focusable="false" />
 
 </RelativeLayout>