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我有一个调用FragmentParent的活动。这包含一个viewpager。 viewpager有2个选项卡。在每个选项卡中都有一个片段。在第一个选项卡（TAB-A）中有一个包含Recyclerview的片段。当我点击一个项目时，应用程序会打开新的片段，但是当我返回时，viewpager中的所有片段都会变空。将片段替换为包含ViewPager的片段
我正在使用片段和支持库v-13，我已经尝试过使用v-4，但我遇到了同样的问题。
这是我的代码：
activity_main.xml中
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
MainActivity.java
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_test);
initWithFragments(savedInstanceState);
}
public void initWithFragments(Bundle savedInstanceState) {
if (findViewById(R.id.fragment_container) != null) {
if (savedInstanceState != null) {
return;
}
// Create a new Fragment to be placed in the activity layout
MainFragment mainFragment = new MainFragment();
//Fragment transaction
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.add(R.id.fragment_container, mainFragment);
ft.commit();
}
}
MainFragment
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_app, container, false);
//Enabled menu
setHasOptionsMenu(true);
// Initialize Toolbar and View Pager
toolbar = (Toolbar) rootView.findViewById(R.id.toolbar);
((AppCompatActivity) getActivity()).setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each section
SectionsPageAdapter mSectionsPagerAdapter = new SectionsPageAdapter(getFragmentManager());
// Set up the ViewPager with the sections adapter.
ViewPager mViewPager = (ViewPager) rootView.findViewById(R.id.container_view_pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
switch (position) {
case 0:
toolbar.setTitle("Home");
break;
case 1:
toolbar.setTitle("Downloads");
break;
default:
break;
}
}
@Override
public void onPageSelected(int position) {
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
// Set up tab layout
TabLayout tabLayout = (TabLayout) rootView.findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
return rootView;
}
fragment_app
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="@dimen/appbar_padding_top"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="@style/AppTheme.PopupOverlay">
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/container_view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</LinearLayout>
这是FragmentA的viewpager
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorGrayLight"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin">
<LinearLayout
android:id="@+id/container_recycler"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="1">
<android.support.v7.widget.RecyclerView
android:id="@+id/video_recycler_view"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
另外我有个内ËPageAdapter
public class SectionsPageAdapter extends FragmentPagerAdapter {
private int NUM_PAGES = 2;
public SectionsPageAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
switch (position) {
case 0:
return SearchFragment.newInstance();
case 1:
return DownloadFragment.newInstance();
default:
return new Fragment();
}
}
@Override
public int getCount() {
return NUM_PAGES;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Search";
case 1:
return "Downloads";
}
return null;
}
}
我使用FragmentTransaction更换片段......
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.fragment_container,settingFragment);
ft.addToBackStack(null);
ft.commit();
如果你们能帮助我，我会很感激 感谢
这是我想要的：
我不是很确定的片段被允许或设计为ViewPager容器。 – Chisko
我想我必须使用getChildFragmentManager –
您是否打算在横向中使用屏幕并同时拥有ViewPager和Details Fragment？ – Chisko