使用scrollview不让键盘覆盖编辑框

我在Android一个界面有一个编辑的文本框，当文本框获得焦点的时候就会弹 出一个模拟键盘，而这个键盘把文本框给盖住了！！！使文本框编辑不方便，也看不到编辑的效果,有什么方法不让模拟键盘遮住文本编辑框了吗,到网上问问各位 大侠和查了些资料具体的解决方法如下，主要使用的是：ScrollView

xml文件：
<? xmlversion="1.0"encoding="utf-8" ?>
< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
android:background ="@drawable/mainbg"
android:layout_width ="fill_parent"
android:layout_height ="wrap_content"
android:orientation ="vertical"
android:paddingTop ="100dip"
android:paddingLeft ="20dip" >


< ScrollView id ="@+id/scrollview"
android:layout_width ="fill_parent"
android:layout_height ="wrap_content"
android:scrollbars ="vertical" >
< LinearLayout
id ="@+id/layout0"
android:orientation ="vertical"
android:layout_width ="fill_parent"
android:layout_height ="wrap_content" >
< LinearLayout
android:id ="@+id/layout"
android:orientation ="horizontal"
android:layout_width ="fill_parent"
android:layout_height ="wrap_content" >
< TextView
android:id ="@+id/title"
android:layout_width ="135px"
android:layout_height ="27px"
android:text ="发送短信内容"
>
</ TextView >
</ LinearLayout >
< LinearLayout
android:id ="@+id/layout1"
android:orientation ="horizontal"
android:layout_width ="fill_parent"
android:layout_height ="wrap_content" >
< EditText
android:id ="@+id/phonnum"
android:layout_width ="190px"
android:layout_height ="43px"
android:layout_x ="22px"
android:layout_y ="128px"
android:phoneNumber ="true"
>
</ EditText >
< TextView
android:id ="@+id/widget27"
android:layout_width ="13px"
android:layout_height ="27px"
android:layout_x ="100px"
android:layout_y ="92px"
>
</ TextView >
< Button
android:id ="@+id/btnlist"
android:layout_width ="69px"
android:layout_height ="29px"
android:background ="@drawable/liman"
android:layout_x ="272px"
android:layout_y ="132px"
android:paddingRight ="5dip"
>
</ Button >
</ LinearLayout >
< LinearLayout
id ="@+id/layout2"
android:orientation ="vertical"
android:layout_width ="fill_parent"
android:layout_height ="wrap_content"
android:paddingBottom ="3px"
android:paddingRight ="10px" >
< EditText
android:id ="@+id/editorcontent"
android:layout_width ="280px"
android:layout_height ="250px"
android:layout_x ="20px"
android:paddingBottom ="3px"
android:paddingRight ="10px" >
</ EditText >
</ LinearLayout >
< LinearLayout
id ="@+id/layout3"
android:orientation ="horizontal"
android:layout_width ="fill_parent"
android:layout_height ="wrap_content" >
< Button
android:id ="@+id/btnsend"
android:background ="@drawable/send"
android:layout_width ="69px"
android:layout_height ="29px"
android:layout_x ="150px"
android:layout_y ="408px"
>
</ Button >
< TextView
android:id ="@+id/widget27"
android:layout_width ="135px"
android:layout_height ="27px"
android:layout_x ="100px"
android:layout_y ="92px"
>
</ TextView >
< Button
android:id ="@+id/btnback"
android:layout_width ="69px"
android:layout_height ="29px"
android:layout_x ="270px"
android:layout_y ="408px"
android:background ="@drawable/backtrack"
>
</ Button >
</ LinearLayout >
</ LinearLayout >
</ ScrollView >
</ LinearLayout >