android - 如果wifi网络在android中不可用，如何通知用户

Question

谁能告诉我如果 wifi 网络在 android 中不可用时如何向用户发出通知，例如 android 中的广播接收器？谁能举个例子？

谢谢

Answer 1

Here is a tutorial to do this, it can do these things:

• 设备上的 WiFi 是否可用
• 是否启用了 WiFi 是 WiFi
• 已连接到接入点

它的要点是:

private class ConnectionChangeReceiver extends BroadcastReceiver {
public void onReceive( Context context, Intent intent ) {
Log.d(tag, "Inside Broadcast Reciever");
CheckWifiStatus();
}
}

private void RegisterWifiWatcher()
{
    if(wifiWatcher == null)
    wifiWatcher = new ConnectionChangeReceiver();

    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
    intentFilter.addAction(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION);
    intentFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
    intentFilter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION);
    registerReceiver(wifiWatcher, intentFilter);
}