MemorySort/MyNFCDemon/res/layout/activity_main.xml

<?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:orientation="vertical" >


    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="1"
        android:orientation="vertical"
        android:gravity="center" >
        
        
         <LinearLayout
	        android:layout_width="fill_parent"
	        android:layout_height="fill_parent"
	        android:layout_weight="1"
	        android:orientation="vertical"
	        android:gravity="center" >

	            <TextView
	                android:layout_width="match_parent"
	                android:layout_height="wrap_content"
	                android:text="请将标签放入识别区域！"
	                android:textSize="18dp" />
	
            </LinearLayout>
    </LinearLayout>

</LinearLayout>