Question

我正在浏览Facebook Android SDK（https://developers.facebook.com/docs/facebook-login/android）并且发现很难理解。我只想在（成功）登录后打开一个新活动，虽然这些步骤显示了很多其他代码，但我不确定我需要哪些代码。这是我的代码：

activity_main.xml中

<com.facebook.login.widget.LoginButton
    android:id="@+id/fb_login_btn"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    tools:layout_editor_absoluteY="496dp" />

MainActivity.java

public class MainActivity extends AppCompatActivity {

    Button or_email;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        or_email = (Button)findViewById(R.id.or_email);

        or_email.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent i = new Intent(MainActivity.this, Register.class);
                MainActivity.this.startActivity(i);
            }

        });

    }

}

Register.java（空白activity_register.xml）

public class Register extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {    
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);    
    }

}

基本上，我只想在成功登录后打开activity_register.xml。所以我想我会在onSuccess()方法下添加一个新的Intent。但是我不确定我应该把这个代码放在哪里，以及它是否需要先前的代码块（FragmentActivity）才能工作。因此，如果有人能够向我解释这三个代码块中的每一个是如何工作的。那太好了。

ps：我已经注册了我的应用程序ID以及按钮正在运行的所有内容，我只是希望它在登录后打开一个新活动。现在它只是在登录后返回到activity_main

修改：以下代码无法打开activity_register，它只会返回activity_main

public class MainActivity extends AppCompatActivity {

    Button or_email;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        FacebookSdk.sdkInitialize(getApplicationContext());
        CallbackManager  mFacebookCallbackManager = CallbackManager.Factory.create();


        setContentView(R.layout.activity_main);

        LoginButton mFacebookSignInButton = (LoginButton)findViewById(R.id.fb_login_btn);
        mFacebookSignInButton.registerCallback(mFacebookCallbackManager,
                new FacebookCallback<LoginResult>() {
                    @Override
                    public void onSuccess(final LoginResult loginResult) {
                        //TODO: Use the Profile class to get information about the current user.
                        Intent intent = new Intent(MainActivity.this, Register.class);
                        startActivity(intent);
                    }

                    @Override
                    public void onCancel() {
                        Toast.makeText(getApplicationContext(), "Cancel", Toast.LENGTH_SHORT).show();
                    }

                    @Override
                    public void onError(FacebookException error) {
                        Toast.makeText(getApplicationContext(), "Error", Toast.LENGTH_SHORT).show();
                    }
                }
        );



        or_email = (Button)findViewById(R.id.or_email);

        or_email.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent i = new Intent(MainActivity.this, Register.class);
                MainActivity.this.startActivity(i);
            }


        });

    }


}

Answer 1

在onCreate（）方法
中添加此代码

FacebookSdk.sdkInitialize(getApplicationContext());
    CallbackManager  mFacebookCallbackManager = CallbackManager.Factory.create();


    setContentView(R.layout.activity_main);

    LoginButton mFacebookSignInButton = (LoginButton)findViewById(R.id.fb_login_btn);
    mFacebookSignInButton.registerCallback(mFacebookCallbackManager,
            new FacebookCallback<LoginResult>() {
                @Override
                public void onSuccess(final LoginResult loginResult) {
                    //TODO: Use the Profile class to get information about the current user.
                    Intent intent = new Intent(MainActivity.this, Register.class);
                    startActivity(intent);
                }

                @Override
                public void onCancel() {
                    Toast.makeText(getApplicationContext(), "Cancel", Toast.LENGTH_SHORT).show();
                }

                @Override
                public void onError(FacebookException error) {
                    Toast.makeText(getApplicationContext(), "Error", Toast.LENGTH_SHORT).show();
                }
            }
    );

Answer 2

试试这个：

在您的活动中：确保您

在facebook sdk

accessTokenTracker

onCreate()

在login Button中授予权限并注册回调。
在onSuccess()方法中启动新活动

最后覆盖onActivityResult()方法并添加带有请求代码的callbackManger.onActivityResult()。

公共类MainActivity扩展了AppCompatActivity {

Button or_email;
CallbackManager  mFacebookCallbackManager;
private AccessTokenTracker accessTokenTracker;
private ProfileTracker mProfileTracker;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    FacebookSdk.sdkInitialize(getApplicationContext());
    setContentView(R.layout.activity_main);

    mFacebookCallbackManager = CallbackManager.Factory.create();
    accessTokenTracker = new AccessTokenTracker() {
        @Override
        protected void onCurrentAccessTokenChanged(AccessToken oldToken, AccessToken newToken) {

        }
    };
    accessTokenTracker.startTracking();

    LoginButton mFacebookSignInButton = (LoginButton)findViewById(R.id.fb_login_btn);
    mFacebookSignInButton.setReadPermissions(Arrays.asList(
            "public_profile", "email", "user_birthday", "user_friends"));
    mFacebookSignInButton.registerCallback(mFacebookCallbackManager, callback);

    or_email = (Button)findViewById(R.id.or_email);

    or_email.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent i = new Intent(MainActivity.this, Register.class);
            MainActivity.this.startActivity(i);
        }


    });

}

 private FacebookCallback<LoginResult> callback = new FacebookCallback<LoginResult>() {

    @Override
    public void onSuccess(LoginResult loginResult) {
        try {
            if (Profile.getCurrentProfile() == null) {
                mProfileTracker = new ProfileTracker() {
                    @Override
                    protected void onCurrentProfileChanged(Profile profile_old, Profile profile_new) {
                        profile = profile_new;
                        Log.v("facebook - profile", profile_new.getFirstName());
                        mProfileTracker.stopTracking();
                    }
                };
                mProfileTracker.startTracking();
            } else {
                profile = Profile.getCurrentProfile();
                Log.v("facebook - profile", profile.getFirstName());
            }
            Intent intent = new Intent(getApplicationContext(), Register.class);
            startActivity(intent);
            finish();
        } catch (Exception e) {
            Log.d("ERROR", e.toString());
        }
    }

    @Override
    public void onCancel() {
        Toast.makeText(getApplicationContext(), "Cancelled", Toast.LENGTH_LONG).show();
    }

    @Override
    public void onError(FacebookException e) {
        Log.d("FACEBOOK ERRROR", e.toString());
        Toast.makeText(getApplicationContext(), "Something went wrong!! Please try again", Toast.LENGTH_LONG).show();
    }
};


 @Override
protected void onActivityResult(int requestCode, int responseCode, Intent intent) {
    super.onActivityResult(requestCode, responseCode, intent);
    mFacebookCallbackManager.onActivityResult(requestCode, responseCode, intent);
}

}

：

<activity
        android:name="com.facebook.FacebookActivity"
        android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
        android:label="@string/app_name"
        android:theme="@android:style/Theme.Translucent.NoTitleBar" />

确保在清单中添加app_id ...

登录Facebook SDK后如何开启新活动

2 个答案: