phonegap插件无法正常工作 - 连接未定义

根据手机间隙文档我应该能够通过简单地添加到添加网络cocnnection插件config.xml

我正在使用示例js函数来测试连接,它似乎不起作用.LogCat显示'无法读取属性'类型'未定义',这让我觉得插件从未添加过.

function checkConnection() {
var networkState = navigator.connection.type;

var states = {};
states[Connection.UNKNOWN]  = 'Unknown connection';
states[Connection.ETHERNET] = 'Ethernet connection';
states[Connection.WIFI]     = 'WiFi connection';
states[Connection.CELL_2G]  = 'Cell 2G connection';
states[Connection.CELL_3G]  = 'Cell 3G connection';
states[Connection.CELL_4G]  = 'Cell 4G connection';
states[Connection.CELL]     = 'Cell generic connection';
states[Connection.NONE]     = 'No network connection';

alert('Connection type: ' + states[networkState]);

}

config.xml文件:

#myapp#"


    #myapp#"


#myapp#"

我是phonegap的新手,之前从未使用过phonegap插件.

我正在使用phonegap 3.1版