android判断当前网络状态

判断当前网络状态：是否可用，可用情况下是使用哪种网络：wifi，mobile，ethernet

需要权限：<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

 /**
     * 检测网络是否可用
     * @return
     */
    public boolean isNetworkConnected() {
        ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo ni = cm.getActiveNetworkInfo();
        return ni != null && ni.isConnectedOrConnecting();
    }


    
    public static final String NETTYPE_NULL = "null";//当前无网络
    public static final String NETTYPE_WIFI = "wifi";//WIFI网络
    public static final String NETTYPE_MOBILE = "mobile";//移动网络
    public static final String NETTYPE_ETHERNET = "ethernet";//以太网
    /**
     * 获取当前网络类型
     */
    public String getNetworkType() {
        String netType = "null";
        ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
        if (networkInfo == null) {
            return netType;
        }        
        int nType = networkInfo.getType();
        if (nType == ConnectivityManager.TYPE_MOBILE) {
            netType = NETTYPE_MOBILE;
        } else if (nType == ConnectivityManager.TYPE_WIFI) {
            netType = NETTYPE_WIFI;
        }else if(nType == ConnectivityManager.TYPE_ETHERNET){
        netType = NETTYPE_ETHERNET;
        }
        return netType;

    }

参考文章：http://www.cnblogs.com/lee0oo0/archive/2013/09/25/3339948.html