android - 检测 3G 或 Wifi 网络恢复

Question

是否可以实现 PhoneStateListener(或任何其他机制)来检测 3G 或 Wifi 网络连接何时恢复？

我在 API 的摘要中看到 LISTEN_DATA_CONNECTION_STATE 和 LISTEN_DATA_ACTIVITY 都说 (cellular)。这是否意味着只有 3G？

谢谢

Answer 1

更好的方法是使用 android.net.ConnectivityManager 类。注册接收器并监听广播。

private class ConnectionMonitor extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (!action.equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
            return;
        }
        boolean noConnectivity = intent.getBooleanExtra(
            ConnectivityManager.EXTRA_NO_CONNECTIVITY, false);
        NetworkInfo aNetworkInfo = (NetworkInfo) intent
            .getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
        if (!noConnectivity) {
            if ((aNetworkInfo.getType() == ConnectivityManager.TYPE_MOBILE)
                || (aNetworkInfo.getType() == ConnectivityManager.TYPE_WIFI)) {
                // Handle connected case
            }
        } else {
            if ((aNetworkInfo.getType() == ConnectivityManager.TYPE_MOBILE)
                || (aNetworkInfo.getType() == ConnectivityManager.TYPE_WIFI)) {
                // Handle disconnected case
            }
        }
    }
}

private synchronized void startMonitoringConnection() {
    IntentFilter aFilter = new IntentFilter(
        ConnectivityManager.CONNECTIVITY_ACTION);
    registerReceiver(mConnectionReceiver, aFilter);
}
private synchronized void stopMonitoringConnection() {
    unregisterReceiver(mConnectionReceiver);
}

在哪里

mConnectionReceiver = new ConnectionMonitor();