行业知识
android 监听网络状态的变化及实战，安卓开发入门教程
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Monitindex.php/tags-1038.html" >or network connections (Wi-Fi, GPRS, UMTS, etc.) （用来处理网络连接 ，包括Wi-Fi, GPRS, UMTS等）
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Send broadcast intents when network connectivity changes（用 网络状态发生变化的时候发出 广播 ）
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Attempt to “fail over” to another network when connectivity to a network is lost（但断开网络连接的时候，尝试去；连接另外一个网络
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Provide an API that allows applications to query the coarse-grained or fine-grained state of the available networks（
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Provide an API that allows applications to request and select networks for their data traffic
怎样获取ConnectivityManager对象呢？
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context
.CONNECTIVITY_SERVICE);
获取 NetworkInfo对象
主要有一下 几种方法
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getNetworkInfo(int networkType)，但是这个方法已经过时，官网的解释如下：This method was deprecated in API level 23. This method does not support multiple connected networks of the same type. Use getAllNetworks() and getNetworkInfo(android.net.Network) instead.
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getNetworkInfo(Network network)
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getActiveNetwork()
Returns a Network object corresponding to the currently active default data network.
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getActiveNetworkInfo()，Returns details about the currently active default data network.
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getAllNetworkInfo()这个方法已经过时，Use getAllNetworks() and getNetworkInfo(android.net.Network) instead.
综上所述，我们如果要知道当前Mobile网络或者WiFi网络是否已经连接上，总共有两种方法。
第一种方法，只不过在 API23的时候已经 过时了
State wifiState = null;
State mobileState = null;
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context
.CONNECTIVITY_SERVICE);
wifiState = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();
mobileState = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();
Log.d(TAG1,
“wifi状态:” + wifiState + “\n mobile状态:” + mobileState);
if (wifiState != null && mobileState != null
&& State.CONNECTED != wifiState
&& State.CONNECTED == mobileState) {// 手机网络连接成功
Log.d(TAG1, “手机2g/3g/4g网络连接成功”);
APP.getInstance().setMobile(true);
APP.getInstance().setWifi(false);
APP.getInstance().setConnected(true);
} else if (wifiState != null && State.CONNECTED == wifiState) {// 无线网络连接成功
Log.d(TAG1, “无线网络连接成功”);
APP.getInstance().setMobile(false);
APP.getInstance().setWifi(true);
APP.getInstance().setConnected(true);
} else if (wifiState != null && mobileState != null
&& State.CONNECTED != wifiState
&& State.CONNECTED != mobileState) {// 手机没有任何的网络
Log.d(TAG1, “手机没有任何的网络”);
APP.getInstance().setMobile(false);
APP.getInstance().setWifi(false);
APP.getInstance().setConnected(false);
}
第二种方法
ConnectivityManager manager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
Log.i(TAG1, “CONNECTIVITY_ACTION”);
NetworkInfo activeNetwork = manager.getActiveNetworkInfo();
if (activeNetwork != null)
