android layout_span 用法

注意看最后一个TableRow

    <TableRow 
        >
    	<Button style="@style/RemoteButton"
    	    android:layout_height="match_parent"
        	android:text="@string/sample_test"/>
		<Button style="@style/RemoteButton"
		    android:layout_height="match_parent"
	        android:text="@string/data_dictionary"/>
	</TableRow>
    
    <TableRow  
       >
   	 	<Button style="@style/RemoteButton"
   	 	    android:layout_height="match_parent"
        	android:text="@string/query_statistics"/>
		<Button style="@style/RemoteButton"
		    android:layout_height="match_parent"
	    	android:text="@string/standard_query"/>
	</TableRow>
    
    <TableRow  
       >
    	<Button style="@style/RemoteButton"
    	    android:layout_height="match_parent"
        	android:text="@string/instrument_mgr"/>
		<Button style="@style/RemoteButton"
		    android:layout_height="match_parent"
	    	android:text="@string/user_config"/>
	</TableRow>
    
    <TableRow  android:background="@color/abc_search_url_text_pressed">
		     <Button style="@style/RemoteButton"
		         android:layout_width="match_parent"
		         android:layout_span="2"
    	    android:layout_height="100dp"
        	android:text="@string/debug"/>
    	
		
	</TableRow>