private QuotesChildCollectFragment f2;
private QuotesChildCollectFragment f1;
private FragmentManager fragmentManager;
private void initViews(){
//getSupportFragmentManager()  ，getParentFragmentManager()
  fragmentManager=getChildFragmentManager();
}
private void setTabSelection(int index) {
        FragmentTransaction ft = fragmentManager.beginTransaction();
        hideFragment(ft);
        switch (index) {
            case IConstants.COLLECT_CONTRACT:
                if (f1== null) {
                    f1 = QuotesChildCollectFragment.newInstance(index);
                    ft.add(R.id.fl_container, f1);
                } else {
                    ft.show(f1);
                }
                break;
            case IConstants.COLLECT_BIBI:
                if (f2 == null) {
                    f2 = QuotesChildCollectFragment.newInstance(index);
                    ft.add(R.id.fl_container, f2);
                }else{
                    ft.show(f2);
                }
                break;
        }
        ft.commit();
        //ft.commitAllowingStateLoss()
    }
    //隱藏所有的fragment
    private void hideFragment(FragmentTransaction transaction){
        if(f1 != null){
            transaction.hide(f1);
        }
        if(f2 != null){
            transaction.hide(f2);
        }
    }

調(diào)用時(shí)默認(rèn)選擇一個(gè)

setTabSelection(IConstants.COLLECT_CONTRACT);

切換時(shí)：

mRadioGroup.setOnCheckedChangeListener((group, checkedId) -> {
            if (checkedId == R.id.rb_default_data_contract) {
                setTabSelection(IConstants.COLLECT_CONTRACT);
            }else if(checkedId == R.id.rb_default_data_bibi) {
                setTabSelection(IConstants.COLLECT_BIBI);
            }
        });

布局要求:用FrameLayout裝載fragment

<FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/fl_container"/>

或者另外一種方式創(chuàng)建fragment

<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal">
        <fragment
            android:name="com.smk.fragment.CardFragment"
            android:id="@+id/cardFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>
        <fragment
            android:name="com.smk.fragment.PackageFragment"
            android:id="@+id/packageFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>
    </LinearLayout>

另外一種方式顯示和隱藏

cardFragment= (CardFragment) fragmentManager.findFragmentById(R.id.cardFragment);
packageFragment= (PackageFragment) fragmentManager.findFragmentById(R.id.packageFragment);
/**
     * 第二種方式
     * @param fragmentHide
     * @param fragmentShow
     */
    private void switchFg(Fragment fragmentHide,Fragment fragmentShow){
        FragmentTransaction ft1 = fragmentManager.beginTransaction();
        ft1.hide(fragmentHide);
        ft1.commit();
        FragmentTransaction ft2 = fragmentManager.beginTransaction();
        ft2.show(fragmentShow);
        ft2.commit();
    }
//調(diào)用
switchFg(packageFragment,cardFragment);

當(dāng)fragment個(gè)數(shù)不固定或者需要從網(wǎng)絡(luò)請(qǐng)求中獲取fragment個(gè)數(shù)時(shí)（一般fragment內(nèi)容一樣），可以使用TabLayout或者第三方的庫(kù)MagicIndicator（https://github.com/hackware1993/MagicIndicator）