1. [代码]点击解锁，透明锁屏    

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/images_beijing"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/imageview_inv"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="#80000000"
        android:gravity="center"
        android:text="点击解锁"
        android:textColor="#ffffff"
        android:textStyle="bold"

         />

</LinearLayout>