安卓 : Logout of Facebook from another Activity

Question

我正在创建一个应用程序，用户可以在其中以不同的方式注册，其中之一是使用 Facebook。 Facebook 登录功能正常，但当我想注销时什么也没做。注销按钮我想要它在另一个 Activity 中。1. 当我启动应用程序时，会显示一个 Activity，其中有一个要注册的按钮。2. 如果用户正确登录，则会显示 Activity 菜单。3. 在菜单中有一个打开用户 Activity 信息的按钮，这是我想放置注销按钮的地方。4.一旦用户注销希望你把我送回初始 Activity (登录按钮所在的位置)。5. 我希望删除或重置首选项，因为如果我正确注册，则不会询问我的记录并直接转到菜单。

这是我使用的代码:

公共(public)类 FacebookLogin 扩展 ActionBarActivity {

//
SharedPreferences pref;
//

// Your Facebook APP ID
private static String APP_ID = "94032093……."; // 

// Instance of Facebook Class
private Facebook facebook = new Facebook(APP_ID);
private AsyncFacebookRunner mAsyncRunner;
String FILENAME = "AndroidSSO_data";
SharedPreferences mPrefs;

// Buttons
ImageView btnFbLogin;
Button Logout;

TextView txttest;
SharedPreferences pref_2;

String nun_2, name_2, email_2;




@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.choose_register);

    //requestWindowFeature(Window.FEATURE_NO_TITLE);
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

    btnFbLogin = (ImageView) findViewById(R.id.imgLogFacebook);
    Logout= (Button) findViewById(R.id.btnLogout);

    pref=getSharedPreferences("bus",Context.MODE_PRIVATE);
    //

    //
    txttest = (TextView)findViewById(R.id.txttest);

     pref_2=getSharedPreferences("facebook",Context.MODE_PRIVATE);
    //

    mAsyncRunner = new AsyncFacebookRunner(facebook);


    /**
     * Login button
     * */
    btnFbLogin.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Log.d("Image Button", "button Clicked");
            loginToFacebook();
        }
    });

    //I WANT MY LOGOUT BUTTON LIKE THIS

    Logout.setOnClickListener(new View.OnClickListener() {

         @Override
        public void onClick(View v) {

            logoutToFacebook();
        }
    });

            if(pref.contains("num")==true ||pref_2.contains("num_2")==true){

            Intent mainIntent = new Intent().setClass(FacebookLogin.this, Menu.class);
            startActivity(mainIntent);
            finish();
    }

    else{
        if(isNetworkAvailable()){

            Toast.makeText(getApplicationContext(), "Welcome... Login please",Toast.LENGTH_LONG).show();
        }


    }   

}




}

/**
 * Login facebook
 * */
@SuppressWarnings("deprecation")
public void loginToFacebook() {


    Toast.makeText(getApplicationContext(), "wait a moment please...",  Toast.LENGTH_LONG).show();


    mPrefs = getSharedPreferences("face",Context.MODE_PRIVATE);

    String access_token = mPrefs.getString("access_token", null);
    long expires = mPrefs.getLong("access_expires", 0);

    if (access_token != null) {
        facebook.setAccessToken(access_token);  

        //i f is loged star 
        Intent menu = new Intent(FacebookLogin.this, Menu.class);
        startActivity(menu);            
        finish();

        Log.d("FB Sessions", "" + facebook.isSessionValid());
    }

    if (expires != 0) {
        facebook.setAccessExpires(expires);
        Toast.makeText(getApplicationContext(), "Error Toast.LENGTH_LONG).show();

    }

    if (!facebook.isSessionValid()) {
        facebook.authorize(this,
                new String[] { "email", "publish_stream" },
                new DialogListener() {

                    @Override
                    public void onCancel() {
                        // Function to handle cancel event
                    }

                    @Override
                    public void onComplete(Bundle values) {

                        SharedPreferences.Editor editor = mPrefs.edit();
                        editor.putString("access_token",
                                facebook.getAccessToken());
                        editor.putLong("access_expires",
                                facebook.getAccessExpires());
                        editor.commit();


                        //save preferences to login 
                        txttest.setText("Bus");
                        txttest.setVisibility(View.INVISIBLE);

                        getProfileInformation();

                        if(pref_2.contains("num_2")==false){
                            if(txttest.getText().toString().matches("Bus")){

                                num_2=txttest.getText().toString();
                                Editor editor2 = pref_2.edit();
                                editor2.putString("num_2", num_2);

                                editor2.commit();
                                num_2=pref_2.getString("num_2", null);
                            }
                        }
                        else{
                            Toast.makeText(getApplicationContext(), "You are login", Toast.LENGTH_LONG).show();
                        }

                        //end preferences 



                        Intent menu = new Intent(FacebookLogin.this, Menu.class);
                        startActivity(menu);
                        finish();

                    }

                    @Override
                    public void onError(DialogError error) {
                        // Function to handle error

                    }

                    @Override
                    public void onFacebookError(FacebookError fberror) {
                        // Function to handle Facebook errors

                    }

                });
    }
}


@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    facebook.authorizeCallback(requestCode, resultCode, data);
}


/**
 * user info
 * */
@SuppressWarnings("deprecation")
public void getProfileInformation() {
    mAsyncRunner.request("me", new RequestListener() {
        @Override
        public void onComplete(String response, Object state) {
            Log.d("Profile", response);
            String json = response;
            try {
                // Facebook Profile JSON data
                JSONObject profile = new JSONObject(json);

                // getting name of the user
                final String name = profile.getString("name");

                name_2 = name.toString();
                Editor editor = pref_2.edit();
                editor.putString("name_2", name_2);

                editor.commit();
                name_2 = pref_2.getString("name_2", null);  

                // getting email of the user
                final String email = profile.getString("email");

                email_2 = email.toString();
                Editor editor2 = pref_2.edit();
                editor2.putString("email_2", email_2);

                editor2.commit();
                email_2 = pref_2.getString("email_2", null);    



                runOnUiThread(new Runnable() {

                    @Override
                    public void run() {
                        //Toast.makeText(getApplicationContext(), "Name: " + name + "\nEmail: " + email, Toast.LENGTH_LONG).show();
                    }

                });


            } catch (JSONException e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onIOException(IOException e, Object state) {
        }

        @Override
        public void onFileNotFoundException(FileNotFoundException e,
                Object state) {
        }

        @Override
        public void onMalformedURLException(MalformedURLException e,
                Object state) {
        }

        @Override
        public void onFacebookError(FacebookError e, Object state) {
        }
    });
}

 Public static void logoutToFacebook (){
//HERE I WANT TO WRITE MY LOGOUT CODE AND CALL FROM ANOTHER ACTIVITY (PROFILE ACTIVITY). 
}

Answer 1

在新的 Facebook SDK 4.0 中，您应该调用:

LoginManager.getInstance().logOut();

在询问 Facebook SDK 中的任何方法之前，不要忘记调用 FacebookSdk.sdkInitialize(getApplicationContext());。