【oschina android源码分析】登陆和退出的设计

一.在登陆页面将用户的登陆信息序列化到本地

// 保存登录信息
loginUserBean.getUser().setAccount(mUserName);
loginUserBean.getUser().setPwd(mPassword);
loginUserBean.getUser().setRememberMe(true);
AppContext.getInstance().saveUserInfo(loginUserBean.getUser());

 /** * 保存登录信息 * * @param user 用户信息 */
    @SuppressWarnings("serial")
    public void saveUserInfo(final User user) {
        this.loginUid = user.getId();
        this.login = true;
        setProperties(new Properties() {
            {
                setProperty("user.uid", String.valueOf(user.getId()));
                setProperty("user.name", user.getName());
                setProperty("user.face", user.getPortrait());// 用户头像-文件名
                setProperty("user.account", user.getAccount());
                setProperty("user.pwd",
                        CyptoUtils.encode("oschinaApp", user.getPwd()));
                setProperty("user.location", user.getLocation());
                setProperty("user.followers",
                        String.valueOf(user.getFollowers()));
                setProperty("user.fans", String.valueOf(user.getFans()));
                setProperty("user.score", String.valueOf(user.getScore()));
                setProperty("user.favoritecount",
                        String.valueOf(user.getFavoritecount()));
                setProperty("user.gender", String.valueOf(user.getGender()));
                setProperty("user.isRememberMe",
                        String.valueOf(user.isRememberMe()));// 是否记住我的信息
            }
        });
    }

二.在应用启动的时候，从本地取用户的信息，如果userId>0的话，则判断用户登陆了

    private void initLogin() {
        User user = getLoginUser();
        if (null != user && user.getId() > 0) {
            login = true;
            loginUid = user.getId();
        } else {
            this.cleanLoginInfo();
        }
    }

    /** * 获得登录用户的信息 * * @return */
    public User getLoginUser() {
        User user = new User();
        user.setId(StringUtils.toInt(getProperty("user.uid"), 0));
        user.setName(getProperty("user.name"));
        user.setPortrait(getProperty("user.face"));
        user.setAccount(getProperty("user.account"));
        user.setLocation(getProperty("user.location"));
        user.setFollowers(StringUtils.toInt(getProperty("user.followers"), 0));
        user.setFans(StringUtils.toInt(getProperty("user.fans"), 0));
        user.setScore(StringUtils.toInt(getProperty("user.score"), 0));
        user.setFavoritecount(StringUtils.toInt(
                getProperty("user.favoritecount"), 0));
        user.setRememberMe(StringUtils.toBool(getProperty("user.isRememberMe")));
        user.setGender(getProperty("user.gender"));
        return user;
    }

三.在登陆页面注销账号，清除用户在本地的缓存信息，并发送广播

    /** * 用户注销 */
    public void Logout() {
        cleanLoginInfo();
        ApiHttpClient.cleanCookie();
        this.cleanCookie();
        this.login = false;
        this.loginUid = 0;

        Intent intent = new Intent(Constants.INTENT_ACTION_LOGOUT);
        sendBroadcast(intent);
    }

    /** * 清除登录信息 */
    public void cleanLoginInfo() {
        this.loginUid = 0;
        this.login = false;
        removeProperty("user.uid", "user.name", "user.face", "user.location",
                "user.followers", "user.fans", "user.score",
                "user.isRememberMe", "user.gender", "user.favoritecount");
    }

四.需要更新的页面注册注销广播，并更新页面

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Bundle args = getArguments();
        if (args != null) {
            event_type = args.getInt(BUNDLE_KEY_EVENT_TYPE);
        }

        if (event_type == EventList.EVENT_LIST_TYPE_MY_EVENT) {
            IntentFilter filter = new IntentFilter(
                    Constants.INTENT_ACTION_USER_CHANGE);
            filter.addAction(Constants.INTENT_ACTION_LOGOUT);
            getActivity().registerReceiver(mReceiver, filter);
        }
    }

    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            requestData(true);
        }
    };

    @Override
    protected void requestData(boolean refresh) {

        if (event_type == EventList.EVENT_LIST_TYPE_NEW_EVENT) {
            mCatalog = -1;
            super.requestData(refresh);
            return;
        }
        if (AppContext.getInstance().isLogin()) {
            mCatalog = AppContext.getInstance().getLoginUid();
            super.requestData(refresh);
        } else {
            mErrorLayout.setErrorType(EmptyLayout.NETWORK_ERROR);
            mErrorLayout.setErrorMessage(getString(R.string.unlogin_tip));
        }
    }

写在后面：

相比广播，如果项目引入eventbus的，使用eventbus的话，可能会让代码更优雅一些。