1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:padding="15dp"
 6     tools:context=".MainActivity" >
 7 
 8     <TextView
 9         android:id="@+id/labelText"
10         android:layout_width="match_parent"
11         android:layout_height="wrap_content"
12         android:gravity="center"
13         android:text="登录界面" />
14     
15     <EditText 
16         android:id="@+id/usernameText"
17         android:layout_below="@id/labelText"
18         android:layout_width="wrap_content"
19         android:layout_height="wrap_content"
20         android:layout_alignRight="@id/labelText"
21         android:layout_alignLeft="@id/labelText"
22         android:hint="username"/>
23     
24     <EditText 
25         android:id="@+id/passwordText"
26         android:layout_below="@id/usernameText"
27         android:layout_width="wrap_content"
28         android:layout_height="wrap_content"
29         android:layout_alignRight="@id/usernameText"
30         android:layout_alignLeft="@id/usernameText"
31         android:hint="password"
32         android:inputType="textPassword"/>
33     
34     <Button 
35         android:id="@+id/cancelButton"
36         android:layout_width="wrap_content"
37         android:layout_height="wrap_content"
38         android:layout_below="@id/passwordText"
39         android:layout_alignRight="@id/passwordText"
40         android:text="取消"/>
41     
42     <Button 
43         android:id="@+id/loadButton"
44         android:layout_width="wrap_content"
45         android:layout_height="wrap_content"
46         android:layout_toLeftOf="@id/cancelButton"
47         android:layout_alignBottom="@id/cancelButton"
48         android:text="登入"/>
49    
50 
51 </RelativeLayout>