相对布局(中)

 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     tools:context="first.pack.MainActivity$PlaceholderFragment" >
 6 
 7     <TextView
 8         android:id="@+id/firstView"
 9         android:layout_width="wrap_content"
10         android:layout_height="wrap_content"
11         android:textSize="50sp"
12         android:background="#FF0000"
13         android:text="hello" />
14     
15     <TextView
16         android:layout_width="wrap_content"
17         android:layout_height="wrap_content"
18         android:layout_toRightOf="@+id/firstView"
19         android:layout_alignBaseline="@+id/firstView"  //对齐基准线！！！
20         android:background="#00FF00"
21         android:text="mirrorhanyu" />
22 
23 </RelativeLayout>

 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     tools:context="first.pack.MainActivity$PlaceholderFragment" >
 6 
 7     <TextView
 8         android:id="@+id/firstView"
 9         android:layout_width="wrap_content"
10         android:layout_height="wrap_content"
11         android:textSize="50sp"
12         android:background="#FF0000"
13         android:layout_alignParentRight="true"   //与父控件右边对齐
14         android:text="hello" />  
15 
16 </RelativeLayout>

 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     tools:context="first.pack.MainActivity$PlaceholderFragment" >
 6 
 7     <RelativeLayout    
 8         android:layout_width="wrap_content"
 9         android:layout_height="300dp"
10         android:background="#00FF00">
11         <TextView
12             android:id="@+id/firstView"
13             android:layout_width="wrap_content"
14             android:layout_height="wrap_content"
15             android:textSize="50sp"
16             android:background="#FF0000"
17             android:layout_alignParentRight="true"   //与就近的父控件对齐
18             android:layout_alignParentBottom="true"
19             android:text="hello" />  
20     </RelativeLayout>
21 </RelativeLayout>