第一步：为了更好的比较，准备两个一模一样的EditText(当Activity启动时，焦点会在第一个EditText上，如果你不希望这样只需要写一个高度和宽带为0的EditText即可避免，这里就不这么做了)，代码如下：

<EditText

    android:layout_width="fill_parent"

        android:layout_height="36dip"

        android:background="@drawable/bg_edittext"

        android:padding="5dip"

    android:layout_margin="36dip"

    android:textColorHint="#AAAAAA"

    android:textSize="15dip"

    android:singleLine="true"

    android:hint="请输入..."

/> 

<?xml version="1.0" encoding="UTF-8"?>

<shape xmlns:android="http://schemas.android.com/apk/res/android">

    <solid android:color="#FFFFFF" />

    <corners android:radius="3dip"/>

    <stroke

        android:width="1dip"

        android:color="#BDC7D8" />

</shape>  

<?xml version="1.0" encoding="UTF-8"?>

<shape xmlns:android="http://schemas.android.com/apk/res/android">

    <solid android:color="#FFFFFF" />

    <corners android:radius="3dip"/>

    <stroke

        android:width="1dip"

        android:color="#728ea3" />

</shape>

<?xml version="1.0" encoding="UTF-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android">

        <item android:state_window_focused="false" android:drawable="@drawable/contact_edit_edittext_normal" />

       <item android:state_focused="true" android:drawable="@drawable/contact_edit_edittext_focused" />

</selector>