你如何检查android中的互联网连接? [英] How do you check the internet connection in android?

问题描述

我想检查每个活动中的互联网连接.如果丢失，应显示一条消息.

I want to check the internet connectivity in each activity. If it is lost a message should be displayed.

谁能指导我如何实现这一目标?

Can any one guide me how to achieve this?

推荐答案

您可以使用 ConnectivityManager 检查网络状态.

You can use the ConnectivityManager to check the network state.

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

if ( conMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.CONNECTED 
    || conMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.CONNECTED ) {

    // notify user you are online

}
else if ( conMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.DISCONNECTED 
    || conMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.DISCONNECTED) {

    // notify user you are not online
}

请注意，常量 ConnectivityManager.TYPE_MOBILE 和 ConnectivityManager.TYPE_WIFI 表示连接类型，这两个值并不详尽.请参阅此处获取详尽列表.

Note that the constants ConnectivityManager.TYPE_MOBILE and ConnectivityManager.TYPE_WIFI represent connection types and these two values are not exhaustive. See here for an exhaustive list.

还要确保您拥有监控网络状态所需的权限.您需要将此权限添加到您的 AndroidManifest.xml 中:

Also make sure that you have the required permission to monitor the network state. You need to add this permission to your AndroidManifest.xml:

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

这篇关于你如何检查android中的互联网连接?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！