// 1. Import dependency
import com.tencent.qcloud.tuicore.TUILogin

// 2. Call the login API. It is recommended to call TUILogin after completing your own login service.
TUILogin.login(context, 
    1400000001,      // Please replace with the SDKAppID from the service activation console
    "denny",         // Please replace with your UserID
    "xxxxxxxxxxx",   // You can generate a UserSig in the console and fill it in here
    new TUICallback() {
    @Override
    public void onSuccess() {
        Log.i(TAG, "login success");
    }

    @Override
    public void onError(int errorCode, String errorMessage) {
        Log.e(TAG, "login failed, errorCode: " + errorCode + " msg:" + errorMessage);
    }
});

class YourLoginService extends TUILoginListener {

    // Listen to login status callback
    public void addObserver() {
        TUILogin.addLoginListener(this);
    }

    // Cancel listening for login status callback
    public void removeObserver() {
        TUILogin.removeLoginListener(this);
    }

    // User kicked offline callback
    @Override
    public void onKickedOffline() {
        // Your business code: UI prompts the user, then log in again
    }

    // User signature expired callback
    @Override
    public void onUserSigExpired() {
        // Your business code: If the current user is still logged in on your backend, you can let your app request a new userSig from the backend and call TUILogin.login to renew the login status.
    }
}