步数换景

<?xml version="1.0" encoding="utf-8"?>
<Lockscreen version="1" frameRate="60" displayDesktop="false" screenWidth="1080" >
    <!--背景图随着步数的改变而移动，4883是图片的宽度-->
    <Image src="bg.jpg" x="0-#steps_value" visibility="gt(-#steps_value,-4883+#screen_width)"/>
              <Image src="bg.jpg" x="-4883+#screen_width" y="0" visibility="le(-#steps_value,-4883+#screen_width)"/>
                <!--显示步数-->
    <Image src="step_picture.png" x="50" y="#screen_height*0.933" />    
    <Text x="130" y="#screen_height*0.93" format="目前步数是: %d" paras="#steps_value" size="50" color="#fdfdfd"/>
      <!--解锁-->
    <Button x="0" y="0" w="#screen_width" h="#screen_height">
        <Trigger action="double">
             <ExternCommand command="unlock"/>        
        </Trigger>
    </Button>     
</Lockscreen>