getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, conversationListFragment)
                .add(R.id.fragment_container, contactListFragment).hide(contactListFragment).show(conversationListFragment)
                .commit();

···
 //umeng api
        MobclickAgent.updateOnlineConfig(this);
        UmengUpdateAgent.setUpdateOnlyWifi(false);
        UmengUpdateAgent.update(this);

        if (getIntent().getBooleanExtra(Constant.ACCOUNT_CONFLICT, false) && !isConflictDialogShow) {
            showConflictDialog();
        } else if (getIntent().getBooleanExtra(Constant.ACCOUNT_REMOVED, false) && !isAccountRemovedDialogShow) {
            showAccountRemovedDialog();
        }

        inviteMessgeDao = new InviteMessgeDao(this);
        userDao = new UserDao(this);
        fragments = new Fragment[3];
        if (savedInstanceState == null) {
            conversationListFragment = new ConversationListFragment();
            contactListFragment = new ContactListFragment();
            settingFragment = new SettingsFragment();
            getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, conversationListFragment, "switcher:" + 0)
                    .add(R.id.fragment_container, contactListFragment, "switcher:" + 1).hide(contactListFragment).show(conversationListFragment)
                    .commit();
        } else {
            conversationListFragment = (ConversationListFragment) getSupportFragmentManager().findFragmentByTag("switcher:" + 0);
            contactListFragment = (ContactListFragment) getSupportFragmentManager().findFragmentByTag("switcher:" + 1);
            settingFragment = (SettingsFragment) getSupportFragmentManager().findFragmentByTag("switcher:" + 2);
            if (conversationListFragment == null) {
                conversationListFragment = new ConversationListFragment();
                getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, conversationListFragment, "switcher:" + 0);
            }

            if (contactListFragment == null) {
                contactListFragment = new ContactListFragment();
                getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, contactListFragment, "switcher:" + 1);
            }

            if (settingFragment == null) {
                settingFragment = new SettingsFragment();
                getSupportFragmentManager().beginTransaction().hide(contactListFragment).show(conversationListFragment)
                        .commit();
            } else {
                getSupportFragmentManager().beginTransaction().hide(contactListFragment).hide(settingFragment).show(conversationListFragment)
                        .commit();
            }
        }
        fragments[0] = conversationListFragment;
        fragments[1] = contactListFragment;
        fragments[2] = settingFragment;

        //注册local广播接收者，用于接收demohelper中发出的群组联系人的变动通知
        registerBroadcastReceiver();


        EMClient.getInstance().contactManager().setContactListener(new MyContactListener());
        //内部测试方法，请忽略
        registerInternalDebugReceiver();

        EMLog.d(TAG, "width:" + getScreenWidth(this) + "  height:" + getScreenHeight(this));
···

···
if (currentTabIndex != index) {
            FragmentTransaction trx = getSupportFragmentManager().beginTransaction();
            trx.hide(fragments[currentTabIndex]);
            if (!fragments[index].isAdded()) {
                trx.add(R.id.fragment_container, fragments[index], "switcher:" + index);
            }
            trx.show(fragments[index]).commit();
        }
···

        @Override
        public void onSuccess() {
            Log.e("111","退出成功");
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    String currentUser = EMClient.getInstance().getCurrentUser();
                    Log.e("222","currentUser:"+ currentUser);
                }
            });
        }

        @Override
        public void onProgress(int progress, String status) {

        }

        @Override
        public void onError(int code, String message) {
            LogUtils.e("退出失败");
        }
    });