我对嵌套片段的堆栈方式有一个问题,并且非常感谢所提供的任何帮助.

我有片段A和片段B.片段A包含另一个片段(ButtonFragment).在活动的onCreate中,我加载片段A,而不是切换到片段B.当我回到片段A(从后台堆栈中)时,我得到以下错误.

Exception dispatching finished signal.

E/MessageQueue-JNI(6330): Exception in MessageQueue callback:
handleReceiveCallback

E/MessageQueue-JNI(6330): android.view.InflateException: Binary XML
file line #16: Error inflating class fragment

…

Caused by: java.lang.IllegalArgumentException: Binary XML file line
16: Duplicate id 0x7f080000, tag null, or parent id 0x0 with another fragment for
com.example.fragmentnavigation.MainActivity$ButtonFragment

没有子片段导航工作.也许我必须添加一些ChildFragmentManager处理,但我不知道在哪里和哪里.我希望你能帮助我.

MainLayout

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<Button
    android:id="@+id/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/app_name" />

<FrameLayout 
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    tools:context="com.example.fragmentnavigation.MainActivity"
    tools:ignore="MergeRootFrame" />
</LinearLayout>

片段布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.fragmentnavigation.MainActivity$FragmentA" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <fragment 
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:name="com.example.fragmentnavigation.MainActivity$ButtonFragment"/> 

</LinearLayout>

MainAcitivity

public class MainActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new FragmentA()).commit();
    }
}
...
private void switchToB() {
    FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
    ft.replace(R.id.container, new BFragment());
    ft.addToBackStack(null);
    ft.commit();
}

片段A.

public static class FragmentA extends Fragment {

        public FragmentA() {
        }

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

ButtonFragment

public static class ButtonFragment extends Fragment {

        public ButtonFragment() {
        }

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

解决方案特别感谢@ arun-kumar

关于碎片的非常好的概述
https://github.com/codepath/android_guides/wiki/Creating-and-Using-Fragments

片段布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.fragmentnavigation.MainActivity$FragmentA" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

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

</LinearLayout>

onCreate of Fragment A

@Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container,
                    false);

            Fragment childFragment = new ButtonFragment();
            FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
            transaction.replace(R.id.child_fragment_container, childFragment).commit();

            return rootView;
        }

解决方法:

您必须在运行时添加子片段,而不是在片段A布局文件的布局中声明它.我在实施谷歌地图时遇到了同样的问题.