网络的连接状态

最新推荐文章于 2025-07-10 23:25:18 发布

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本文介绍如何检查设备是否具有连接到数据网络的能力，主要关注WifiStateMachine.java的使用。

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查看当前连接网络是否有连接数据网络的能力：

    ConnectivityManager connectivityManager = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);
    if (connectivityManager != null) {
        NetworkInfo networkInfo = connectivityManager
                .getActiveNetworkInfo();
//networkInfo.isAvailable()    //networkInfo.isConnected()  

   if (networkInfo != null && networkInfo.isConnected()) {
            if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
                return NETWORK_WIFI_CONNECTION;
            }
            return NETWORK_MOBILE_CONNECTION;
        }
    }
    return NETWORK_DISCONNECTION;
}

WifiStateMachine.java

/**
 * TODO:
 * Deprecate WIFI_STATE_UNKNOWN
 */

/**
 * Track the state of Wifi connectivity. All event handling is done here,
 * and all changes in connectivity state are initiated here.
 *
 * Wi-Fi now supports three modes of operation: Client, SoftAp and p2p
 * In the current implementation, we support concurrent wifi p2p and wifi operation.
 * The WifiStateMachine handles SoftAp and Client operations while WifiP2pService
 * handles p2p operation.
 *
 * @hide
 */
public class WifiStateMachine extends StateMachine implements WifiNative.WifiRssiEventHandler {