Question

我正在尝试为我的Android应用使用FirebaseAuth来实现signInWithEmailAndPassword()的登录身份验证。我如何处理Internet连接脱机的情况，以便生成关于网络问题的Toast message。

Answer 1

这就是我的方法，我创建了一个类...然后使用以下代码。

 public class InternetStatus {

    private static InternetStatus instance = new InternetStatus();
    static Context context;
    ConnectivityManager connectivityManager;
    NetworkInfo wifiInfo, mobileInfo;
    boolean connected = false;

    public static InternetStatus getInstance(Context ctx) {
        context = ctx.getApplicationContext();
        return instance;
    }

    public boolean isOnline() {
        try {
            connectivityManager = (ConnectivityManager) context
                    .getSystemService(Context.CONNECTIVITY_SERVICE);

            NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
            connected = networkInfo != null && networkInfo.isAvailable() &&
                    networkInfo.isConnected();
            return connected;


        } catch (Exception e) {
            System.out.println("CheckConnectivity Exception: " + e.getMessage());
            Log.v("connectivity", e.toString());
        }
        return connected;
    }


}

然后为了使用它...

if (InternetStatus.getInstance(getApplicationContext()).isOnline()) {
        Log.i(TAG, "User is online");
        // proceed with your firebase auth code.
    } else {
        Log.e(TAG, "User does not have an internet connection");
        //create a toast message, or however you want to handle this error.
    }

Answer 2

经过一番摆弄之后，我发现可以使用OnFailureListener来处理它，因为Exception生成的signInWithEmailAndPassword()是FirebaseNetworkException的实例。

Answer 3

您可以使用以下代码段：

public static boolean hasActiveInternetConnection(Context context) {
    if (isNetworkAvailable(context)) {
        try {
            HttpURLConnection urlc = (HttpURLConnection) (new URL("http://www.google.com").openConnection());
            urlc.setRequestProperty("User-Agent", "Test");
            urlc.setRequestProperty("Connection", "close");
            urlc.setConnectTimeout(1500); 
            urlc.connect();
            return (urlc.getResponseCode() == 200);
        } catch (IOException e) {
        Log.e(LOG_TAG, "Error checking internet connection", e);
        }
    } else {
    Log.d(LOG_TAG, "No network available!");
    }
    return false;
}

，并将其添加到您的Manifest.xml中：

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

如果由于网络离线导致FirebaseAuth登录失败，该如何处理？

3 个答案: