舉例

xml檔案如下所示

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/bg_login"
    android:gravity="center"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/log_box"
        android:gravity="center"
        android:orientation="vertical" >

        <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical" >

            <EditText
                android:id="@+id/et_login_pwd"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/et_login_name"
                android:layout_marginBottom="12dp"
                android:layout_marginLeft="110dp"
                android:background="@drawable/shuru"
                android:ems="10"
                android:password="true" >

                <requestFocus />
            </EditText>

            <TextView
                android:id="@+id/tv_login_forget_pwd"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/et_login_pwd"
                android:layout_marginLeft="120dp"
                android:text="@string/str_forget_pwd"
                android:textColor="@color/branse"
                android:textStyle="bold"
                android:textSize="20dp" />

            <Button
                android:id="@+id/btn_login_regist"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="56dp"
                android:layout_marginTop="75dp"
                android:layout_toRightOf="@+id/btn_login_login"
                android:background="@drawable/xml_regist_btn" />

            <Button
                android:id="@+id/btn_login_login"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentTop="true"
                android:layout_marginLeft="10dp"
                android:layout_toRightOf="@+id/et_login_pwd"
                android:background="@drawable/xml_login_btn" />

            <EditText
                android:id="@+id/et_login_name"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignLeft="@+id/et_login_pwd"
                android:layout_alignParentTop="true"
                android:layout_alignRight="@+id/et_login_pwd"
                android:layout_marginBottom="20dp"
                android:background="@drawable/shuru"
                android:ems="10" />

        </RelativeLayout>
    </LinearLayout>

</LinearLayout>

下圖是按照ＵＩ設計出來的效果圖

對於RelativeLayout 控制元件不熟悉

曾經參考

http://www.cnblogs.com/over140/archive/2011/01/26/1945083.html