Android MainFragment中使用多个Fragment

概述当前MainFragment中创添加多个Fragment代码如下：MainFragment的Layout文件main_dialog_fragment<?xmlversion="1.0"encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apkes/android"xmlns:app="http://

当前 MainFragment中创添加多个Fragment代码如下：

MainFragment的Layout文件main_dialog_fragment

<?xml version="1.0" enCoding="utf-8"?><linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"    xmlns:app="http://schemas.androID.com/apk/res-auto"    androID:ID="@+ID/ll_root_vIEw"    androID:layout_wIDth="match_parent"    androID:layout_height="match_parent"    androID:background="@color/white"    androID:clickable="true"    androID:fitsSystemwindows="true"    androID:focusableIntouchMode="true"    androID:orIEntation="vertical">        //...省略无关代码        <FrameLayout            androID:ID="@+ID/fragment_container"            androID:layout_wIDth="match_parent"            androID:layout_height="match_parent"            androID:background="@androID:color/white">        </FrameLayout>    </linearLayout></linearLayout>

MainFragment.Java文件如下:

    @Nullable    @OverrIDe    public VIEw onCreateVIEw(@NonNull LayoutInflater inflater, @Nullable VIEwGroup container, @Nullable Bundle savedInstanceState) {        initParams();        VIEw rootVIEw = inflater.inflate(R.layout.main_dialog_fragment, container, false);        initFragments(savedInstanceState);        return rootVIEw;    }     //初始化两个Fragment 并且显示第一个    private voID initFragments(@Nullable Bundle savedInstanceState) {        FragmentActivity fragmentActivity = getActivity();        if (fragmentActivity == null) {            return;        }        //savedInstanceState是对Bundle对象的引用，可以使用此捆绑包中存储的数据将自身恢复到以前的状态        if (savedInstanceState == null) {            try {                //初始化Fragment                m_fragment1 = new PaymentSubFragment1();                m_fragment2 = new PaymentSubFragment2();                                fragmentActivity.getSupportFragmentManager().beginTransaction()                        .add(R.ID.fragment_container, m_fragment1, kTagFragment1)                        .add(R.ID.fragment_container, m_fragment2, kTagFragment2)                        .detach(m_fragment2)                        .commit();            }catch (Exception e){                Utils.printBBException(e,279);            }            //设定当前的Fragment,知道下一次hIDe那个Fragment            m_CurFragment = m_fragment1;        } else {            //由于FragmentManager已经存在了这些Fragment直接获取就可以了            m_fragment1 = (PaymentSubFragment1) fragmentActivity.getSupportFragmentManager()                    .findFragmentByTag(kTagFragment1);            m_fragment2 = (PaymentSubFragment2) fragmentActivity.getSupportFragmentManager()                    .findFragmentByTag(kTagFragment2);        }    }

这时运行会报出如下错误：

E/AndroIDRuntime: FATAL EXCEPTION: main    Process: com.xxx.androID, PID: 29708    java.lang.IllegalArgumentException: No vIEw found for ID 0x7f08030b (com.xxx.androID:ID/fragment_container) for fragment PaymentSubFragment1{3820d34 (412762d8-5144-47fd-9ff7-abf3ce161066) ID=0x7f08030b kTagFragment1}        at androIDx.fragment.app.FragmentManagerImpl.movetoState(FragmentManagerImpl.java:875)        at androIDx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManagerImpl.java:1238)        at androIDx.fragment.app.FragmentManagerImpl.movetoState(FragmentManagerImpl.java:1303)        at androIDx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:439)        at androIDx.fragment.app.FragmentManagerImpl.executeOps(FragmentManagerImpl.java:2079)        at androIDx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1869)        at androIDx.fragment.app.FragmentManagerImpl.removeRedundantoperationsAndExecute(FragmentManagerImpl.java:1824)        at androIDx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManagerImpl.java:1727)        at androIDx.fragment.app.FragmentManagerImpl$2.run(FragmentManagerImpl.java:150)        at androID.os.Handler.handleCallback(Handler.java:883)        at androID.os.Handler.dispatchMessage(Handler.java:100)        at androID.os.Looper.loop(Looper.java:264)        at androID.app.ActivityThread.main(ActivityThread.java:7581)        at java.lang.reflect.Method.invoke(Native Method)        at com.androID.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)        at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:980)

提示原因找不到VIEw 名称为 fragment_container, 实际上Layout文件中是存在的，原因是在MainFragment中使用了getSupportFragmentManager方法，因为getSupportFragmentManager方法是属于FragmentActivity类的,因为查找的是Activity的Layout文件所以找不到这个VIEw, 将其改为getChildFragmentManager就是当前MainFragment的Layout了，修改后代码如下：

    //初始化两个Fragment 并且显示第一个    private voID initFragments(@Nullable Bundle savedInstanceState) {        if (savedInstanceState == null) {            try {                //初始化Fragment                m_fragment1 = new PaymentSubFragment1();                m_fragment2 = new PaymentSubFragment2();                getChildFragmentManager().beginTransaction()                        .add(R.ID.fragment_container, m_fragment1, kTagFragment1)                        .add(R.ID.fragment_container, m_fragment2, kTagFragment2)                        .detach(m_fragment2)                        .commit();            }catch (Exception e){                Utils.printBBException(e,279);            }            //设定当前的Fragment,知道下一次hIDe那个Fragment            m_CurFragment = m_fragment1;        } else {            //由于FragmentManager已经存在了这些Fragment直接获取就可以了            m_fragment1 = (PaymentSubFragment1) getChildFragmentManager()                    .findFragmentByTag(kTagFragment1);            m_fragment2 = (PaymentSubFragment2) getChildFragmentManager()                    .findFragmentByTag(kTagFragment2);        }    }

总结

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