由网友(无眛)分享简介：我怎么知道是否我的设备连接网络或不？如何检测连接？任何样品code？ How would i know whether my device is connected the web or not? How can i detect connectivity? Any sample code? 推荐答案首先，你需要...

我怎么知道是否我的设备连接网络或不？如何检测连接？任何样品code？

How would i know whether my device is connected the web or not? How can i detect connectivity? Any sample code?

推荐答案

首先，你需要的权限知道设备是否连接到网络，或不。这需要在您的清单，在＆LT;舱单＆GT; 元素：

First, you need permission to know whether the device is connected to the web or not. This needs to be in your manifest, in the <manifest> element:

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

接下来，你需要获得一个引用ConnectivityManager:

ConnectivityManager cm = (ConnectivityManager) Context.getSystemService(Context.CONNECTIVITY_SERVICE);

从那里，你需要获得一个的NetworkInfo 的对象。对于大多数人来说，这将意味着使用ConnectivityManager. getActiveNetworkInfo（）：

From there you need to obtain a NetworkInfo object. For most, this will mean using ConnectivityManager. getActiveNetworkInfo():

NetworkInfo ni = cm.getActiveNetworkInfo();
if (ni == null) {
    // There are no active networks.
    return false;
}

从那里，你只需要使用的NetworkInfo的方法之一，以确定该设备连接到互联网：

From there, you just need to use one of NetworkInfo's methods to determine if the device is connected to the internet:

boolean isConnected = ni.isConnected();