Just to make the comments above a bit clearer:
You should create a file in drawables.
e.g: textinputborder.xml..
Then add the following code for the border shape and color to that file:
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="#00000000" />
<stroke android:width="2.5dp"
android:color="#FFFFFF" />
<corners
android:radius="5dp"/>
</shape>
Then use this shape for the edit text widget inside an activity xml file as required:
<EditText
android:id="@+id/searchBox"
android:layout_width="fill_parent"
android:layout_height="45dp"
android:background="@drawable/textinputborder"
android:hint="@string/Search"
android:paddingLeft="10dp"
android:inputType="textVisiblePassword" >
</EditText>
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