片段内的片段

Question

片段内的片段

Ija*_*med 123 android android-fragments android-nested-fragment

我需要有关片段内部片段的帮助,实际上我在按下后退按钮时遇到问题.应用主屏幕具有按钮和按下每个按钮上考虑到与新的片段替换(和该片段包含另一个片段内),动态地添加/更换片段工作正常,通过按压按钮1片段代替,按压按钮时发生同样的情况,但是,如果我按按钮再次出现异常:

"Duplicate id 0x7f05000a, tag null, or parent id 0x7f050009 with
another fragment for com........ fragmentname"

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意味着片段或内部片段已经添加,我试图再次添加它们,任何人都知道如何使用片段内部片段和来回移动没有任何问题,感谢支持.

MainActivity,其中片段是动态添加和替换的.

public class FragmentInsideFragmentTestActivity extends Activity {

    private Button button1;
    private Button button2;
    private Button button3;
    private Button button4;


    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        button1 =(Button) this.findViewById(R.id.button1);
        button1.setOnClickListener(new View.OnClickListener() {
           public void onClick(View view) {
               onButtonClick(view);
            }
        });

        button2 =(Button) this.findViewById(R.id.button2);
        button2.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                onButtonClick(view);
            }
        });

        button3 =(Button) this.findViewById(R.id.button3);
        button3.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
               onButtonClick(view);
            }
        });

        button4 =(Button) this.findViewById(R.id.button4);
        button4.setOnClickListener(new View.OnClickListener() {
           public void onClick(View view) {
               onButtonClick(view);
           }
        });
    }

    public void onButtonClick(View v) {
        Fragment fg;

        switch (v.getId()) {
           case R.id.button1:
                   fg=FirstFragment.newInstance();
                   replaceFragment(fg);
                   break;
           case R.id.button2:
                   fg=SecondFragment.newInstance();
                   replaceFragment(fg);
                   break;
           case R.id.button3:
                   fg=FirstFragment.newInstance();
                   replaceFragment(fg);
                   break;
           case R.id.button4:
                   fg=SecondFragment.newInstance();
                   replaceFragment(fg);
                   break;
        }
    }

    private void replaceFragment(Fragment newFragment) {
       FragmentTransaction trasection = getFragmentManager().beginTransaction();

        if(!newFragment.isAdded()) {
            try {
                //FragmentTransaction trasection =
                getFragmentManager().beginTransaction();
                trasection.replace(R.id.linearLayout2, newFragment);
                trasection.addToBackStack(null);
                trasection.commit();
            } catch (Exception e) {
                // TODO: handle exception
                // AppConstants.printLog(e.getMessage());
            } else {
                trasection.show(newFragment);
            }
        }
    }

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这是Layout:main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">

    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button1" />

        <Button
            android:id="@+id/button2"
            android:text="Button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <Button
            android:id="@+id/button3"
            android:text="Button3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <Button
            android:id="@+id/button4"
            android:text="Button4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/linearLayout2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" />
</LinearLayout>

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希望我试着解决我的问题.

Answer 1

Com*_*are 273

AFAIK,碎片不能容纳其他碎片.

UPDATE

使用当前版本的Android Support软件包 - 或API级别17及更高级别的本机片段 - 您可以通过以下方式嵌套片段getChildFragmentManager().请注意,这意味着您需要在API级别11-16上使用Android支持包版本的片段,因为即使这些设备上存在片段的本机版本,该版本也没有getChildFragmentManager().

这个平台真的很糟糕.我花了三个小时调试这个,因为内部片段第一次渲染得很好,但是在屏幕方向改变后会消失*.没有例外,日志信息,没有.切换到`getChildFragmentManager()`并从内部片段(pity)中删除`setRetainInstance(true)`修复它.谢谢你再次保存我的培根,@ CommonsWare. (28认同)

Answer 2

Sur*_*gch 71

我需要更多的上下文,所以我举了一个例子来说明这是如何完成的.我在准备时读到的最有用的是:

创建和使用片段

活动

activity_main.xml中

添加FrameLayout到您的活动以保存父片段.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Activity"/>

    <FrameLayout
        android:id="@+id/parent_fragment_container"
        android:layout_width="match_parent"
        android:layout_height="200dp"/>

 </LinearLayout>

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MainActivity.java

加载父片段并实现片段侦听器.(参见片段通信.)

import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity implements ParentFragment.OnFragmentInteractionListener, ChildFragment.OnFragmentInteractionListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Begin the transaction
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        ft.replace(R.id.parent_fragment_container, new ParentFragment());
        ft.commit();
    }

    @Override
    public void messageFromParentFragment(Uri uri) {
        Log.i("TAG", "received communication from parent fragment");
    }

    @Override
    public void messageFromChildFragment(Uri uri) {
        Log.i("TAG", "received communication from child fragment");
    }
}

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父片段

fragment_parent.xml

FrameLayout为子片段添加另一个容器.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:layout_margin="20dp"
              android:background="#91d0c2">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Parent fragment"/>

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

    </FrameLayout>

</LinearLayout>

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ParentFragment.java

使用getChildFragmentManager在onViewCreated设立子片段.

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;    

public class ParentFragment extends Fragment {

    private OnFragmentInteractionListener mListener;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_parent, container, false);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        Fragment childFragment = new ChildFragment();
        FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
        transaction.replace(R.id.child_fragment_container, childFragment).commit();
    }


    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        void messageFromParentFragment(Uri uri);
    }
}

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儿童片段

fragment_child.xml

这里没什么特别的.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:layout_margin="20dp"
              android:background="#f1ff91">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Child fragment"/>
</LinearLayout>

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ChildFragment.java

这里也没什么特别的.

import android.support.v4.app.Fragment;

public class ChildFragment extends Fragment {

    private OnFragmentInteractionListener mListener;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_child, container, false);
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }


    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        void messageFromChildFragment(Uri uri);
    }
}

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笔记

正在使用支持库,以便在Android 4.2之前可以使用嵌套片段.

Answer 3

Nik*_*Nik 66

自Android 4.2(API 17)嵌套片段变得可用http://developer.android.com/about/versions/android-4.2.html#NestedFragments

要将片段放在其他片段中,请使用getChildFragmentManager()

它也可以在支持库中使用!

Answer 4

Nap*_*ean 12

片段可以添加到其他片段中,但是每次调用父片段的onDestroyView()方法时,您都需要将它从父片段中删除.并再次在Parent Fragment的OnCreateView()方法中添加它.

就这样做:

@Override
    public void onDestroyView()
    {
                FragmentManager mFragmentMgr= getFragmentManager();
        FragmentTransaction mTransaction = mFragmentMgr.beginTransaction();
                Fragment childFragment =mFragmentMgr.findFragmentByTag("qa_fragment")
        mTransaction.remove(childFragment);
        mTransaction.commit();
        super.onDestroyView();
    }

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这不适合我.我有一个片段,它膨胀了一个包含两个子视图的视图.在`onActivityCreated()`中,它使用`getFragmentManager()`在每个视图中添加了两个片段.这是第一次工作,但在轮换和恢复时,只有一个碎片可见.使用`getChildFragmentManager()`代替行为是正确的.这里建议的方法引发了一个异常,因为已经调用了活动的`onSaveInstanceState()`.使用`commitAllowingStateLoss()`提交事务避免了异常,但没有解决原始问题. (4认同)

Answer 5

Vet*_*lll 8

我解决了这个问题.您可以使用支持库和ViewPager.如果您不需要通过手势滑动,则可以禁用滑动.所以这里有一些代码来改进我的解决方案:

public class TestFragment extends Fragment{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.frag, container, false);
    final ArrayList<Fragment> list = new ArrayList<Fragment>();

    list.add(new TrFrag());
    list.add(new TrFrag());
    list.add(new TrFrag());

    ViewPager pager = (ViewPager) v.findViewById(R.id.pager);
    pager.setAdapter(new FragmentPagerAdapter(getChildFragmentManager()) {
        @Override
        public Fragment getItem(int i) {
            return list.get(i);
        }

        @Override
        public int getCount() {
            return list.size();
        }
    });
    return v;
}
}

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PSIt是用于测试的丑陋代码,但它改进了它是可能的.

PPS Inside片段ChildFragmentManager应传递给ViewPagerAdapter

Answer 6

S.M*_*ian 7

你可以使用getChildFragmentManager()功能.

例:

父片段:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    rootView = inflater.inflate(R.layout.parent_fragment, container,
            false);


    }

    //child fragment 
    FragmentManager childFragMan = getChildFragmentManager();
    FragmentTransaction childFragTrans = childFragMan.beginTransaction();
    ChildFragment fragB = new ChildFragment ();
    childFragTrans.add(R.id.FRAGMENT_PLACEHOLDER, fragB);
    childFragTrans.addToBackStack("B");
    childFragTrans.commit();        


    return rootView;
}

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父布局(parent_fragment.xml):

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/white">



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




</LinearLayout>

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儿童片段:

public class ChildFragment extends Fragment implements View.OnClickListener{

    View v ;
    @Override
    public View onCreateView(LayoutInflater inflater,
                             @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        View rootView = inflater.inflate(R.layout.child_fragment, container, false);


        v = rootView;


        return rootView;
    }



    @Override
    public void onClick(View view) {


    }


}

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Answer 7

Wij*_*rma 5

没什么复杂的。我们不能在这里使用getFragmentManager()。为了在 Fragment 中使用 Fragment ，我们使用getChildFragmentManager(). 休息也会一样。

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