Android应用程序使用Facebook登录无法安装Facebook App

Question

当我卸载Facebook App但没有安装Facebook App时,此代码运行良好.我正在使用Facebook SDK 4.0.

这是我的代码

package com.example.nhp04.gqfood;
import com.facebook.AccessToken;
import com.facebook.AccessTokenTracker;
import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.FacebookSdk;
import com.facebook.Profile;
import com.facebook.login.LoginResult;
import com.facebook.login.widget.LoginButton;



public class Login extends AppCompatActivity implements Animation.AnimationListener {

private String info = "";
private LoginButton loginButton;
private CallbackManager callbackManager;
private AccessTokenTracker tracker;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        FacebookSdk.sdkInitialize(getApplicationContext());
        callbackManager = CallbackManager.Factory.create();
        setContentView(R.layout.activity_login);
loginButton = (LoginButton)findViewById(R.id.login_button);



loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            AccessToken accessToken = loginResult.getAccessToken();
            Profile profile = Profile.getCurrentProfile();
            info = ("User ID: " + 

    loginResult.getAccessToken().getUserId() + "\n" + "Auth Token: " + loginResult.getAccessToken().getToken());
                }

                @Override
                public void onCancel() {
                    info = ("Login attempt canceled.");
                }

                @Override
                public void onError(FacebookException e) {
                    info = ("Login attempt failed.");
                }
            });
            System.out.println(info);
            tracker = new AccessTokenTracker() {
            @Override
            protected void onCurrentAccessTokenChanged(AccessToken oldAccessToken, AccessToken currentAccessToken) {

            }
        };
        tracker.startTracking();
    }
    }

此功能用于检查登录

public boolean isLoggedIn() {
    AccessToken accessToken = AccessToken.getCurrentAccessToken();
    return accessToken != null;
}

这在Resume和Stop方法上

@Override
protected void onResume() {
    super.onResume();
    if (isLoggedIn()){
        Intent home = new Intent(this, home.class);
        startActivity(home);
    }
}

@Override
protected void onStop() {
    super.onStop();
    tracker.stopTracking();
    finish();
}

这是我的onActivityResult

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    callbackManager.onActivityResult(requestCode, resultCode, data);
    if (resultCode == RESULT_OK) {
        Intent home = new Intent(this, home.class);
        startActivity(home);
    } else {
        Toast.makeText(getApplicationContext(), "Unable to login please check your internet connection",Toast.LENGTH_LONG).show();
    }
}

Answer 1

您可以在 Facebook 应用程序中删除您的应用程序。就像您可以在设置>>帐户设置>>应用程序>>您的应用程序>>删除中打开Facebook应用程序。删除您的应用程序后，它会卸载您的应用程序。然后重新安装它并检查 Facebook 登录是否正常。