phonegap3.4检查网络状态

参考文档：

https://github.com/apache/cordova-plugin-network-information/blob/master/doc/index.md

1、安装插件

cordova plugin add org.apache.cordova.network-information

2、js脚本

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';

    console.log('Connection type: ' + states[networkState]);

3、修改后台java类：NetworkManager

安装好插件后，如果联网状态下，应用运行没有问题，但是在断网状态下，应用无法启动

private JSONObject getConnectionInfo(NetworkInfo info) {
        String type = TYPE_NONE;
        if (info != null) {
            // If we are not connected to any network set type to none
            if (!info.isConnected()) {
                type = TYPE_NONE;
            }
            else {
                type = getType(info);
            }
        }
        /***********open************/
        String extraInfo = null;
        if(info != null){
        extraInfo = info.getExtraInfo();
        }
//        String extraInfo = info.getExtraInfo();
        /***********************/

        Log.d("CordovaNetworkManager", "Connection Type: " + type);
        Log.d("CordovaNetworkManager", "Connection Extra Info: " + extraInfo);

        JSONObject cOnnectionInfo= new JSONObject();

        try {
            connectionInfo.put("type", type);
            connectionInfo.put("extraInfo", extraInfo);
        } catch (JSONException e) { }

        return connectionInfo;
    }

上面的代码中，info为null，导致应用启动过程中抛出异常，修改了源码

这个异常应该不会是官方的bug，但是在我的应用中会报错，其他的插件用起来都没有问题，唯独这个插件。原因待查明。