android中fragment的显示和隐藏

private void switchFragment() {    Bundle bundle = getIntent().getExtras();    int categoryInt = bundle.getInt("category", -1);    if (categoryInt == -1) {        LogUtils.e(TAG, "categoryInt error.");        return;    }    mFragmentTransaction = getSupportFragmentManager().beginTransaction();    hideFragment(mFragmentTransaction);    switch (categoryInt) {        case ConstantUtils.MemberDetails.CATEGORY_MEMBER:            if (mMemberDetailsFragment == null) {                mMemberDetailsFragment = new MemberDetailsFragment();                mFragmentTransaction.add(R.id.fragment_container, mMemberDetailsFragment);            } else {                mFragmentTransaction.show(mMemberDetailsFragment);            }            break;        case ConstantUtils.MemberDetails.CATEGORY_CUSTOMER:            if (mCustomerDetailsFragment == null) {                mCustomerDetailsFragment = new CustomerDetailsFragment();                mFragmentTransaction.add(R.id.fragment_container, mCustomerDetailsFragment);            } else {                mFragmentTransaction.show(mCustomerDetailsFragment);            }            break;        default:            break;    }}public void hideFragment(FragmentTransaction mFragmentTransaction) {    if (mMemberDetailsFragment != null) {        mFragmentTransaction.hide(mMemberDetailsFragment);    }    if (mCustomerDetailsFragment != null) {        mFragmentTransaction.hide(mCustomerDetailsFragment);    }}
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