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我有一个选项卡视图设置，它具有使用viewpager每个选项卡的自定义片段。这是我的代码：Android的TabLayout ViewPager不充气在背后的标签片段
控股片段
public class FragInboxMainView extends Fragment implements CGFragment {
private CGController controller;
private CGFragment thisFragment;
@Bind(R.id.inboxViewPager)ViewPager inboxViewPager;
@Bind(R.id.inboxTabs)TabLayout inboxTabLayout;
@Bind(R.id.inbox_progress_wheel)ProgressWheel inboxProgressWheel;
public FragInboxMainView(){}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_inbox_mainview, container, false);
ButterKnife.bind(this, rootView);
thisFragment = this;
Globals g = Globals.getInstance();
/** Show loading spinner */
this.inboxProgressWheel.setBarColor(ContextCompat.getColor(controller.getContext(), g.getUserObject().getUserThemeColor()));
this.inboxProgressWheel.setVisibility(View.VISIBLE);
/** Display the profile information based off the ID */
controller.displayInbox(thisFragment);
return rootView;
}
public void hideProgressSpinner() {
this.inboxProgressWheel.setVisibility(View.GONE);
}
public ViewPager getInboxViewPager() {
return this.inboxViewPager;
}
public TabLayout getInboxTabLayout() {
return this.inboxTabLayout;
}
}
其布局文件
<?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"
xmlns:wheel="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.design.widget.TabLayout
android:id="@+id/inboxTabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="scrollable" />
<com.pnikosis.materialishprogress.ProgressWheel
android:id="@+id/inbox_progress_wheel"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_gravity="center"
wheel:matProg_barColor="#5588FF"
wheel:matProg_progressIndeterminate="true"
android:visibility="gone"/>
<android.support.v4.view.ViewPager
android:id="@+id/inboxViewPager"
android:layout_width="match_parent"
android:layout_height="0px"
android:layout_weight="1"
android:background="@android:color/white" />
</LinearLayout>
标签片段和通胀文件
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
android:id="@+id/main_content"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.baoyz.widget.PullRefreshLayout
android:id="@+id/tabPullRefresh"
android:layout_width="match_parent"
android:layout_height="match_parent">
<view
android:id="@+id/tabRecyclerHolder"
class="android.support.v7.widget.RecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="8dp"
android:paddingBottom="8dp"
android:clipToPadding="false"
android:layout_centerInParent="true"/>
</com.baoyz.widget.PullRefreshLayout>
<com.melnykov.fab.FloatingActionButton
android:id="@+id/tabFab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|right"
android:layout_margin="16dp"
android:src="@mipmap/ic_add_white"/>
</android.support.design.widget.CoordinatorLayout>
public class TabRecyclerHolder extends Fragment {
@Bind(R.id.tabRecyclerHolder) RecyclerView tabRecyclerHolder;
@Bind(R.id.tabPullRefresh) PullRefreshLayout tabPullRefresh;
@Bind(R.id.tabFab) FloatingActionButton recyclerFab;
private String tabTitle = "Title";
public TabRecyclerHolder(){}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.tab_recycler_holder, container, false);
ButterKnife.bind(this, rootView);
recyclerFab.hide(false);
tabPullRefresh.setRefreshStyle(PullRefreshLayout.STYLE_MATERIAL);
return rootView;
}
public RecyclerView getTabRecyclerHolder() {
return this.tabRecyclerHolder;
}
public FloatingActionButton getRecyclerFab() {
return this.recyclerFab;
}
public String getTabTitle() {
return this.tabTitle;
}
public void setTabTitle(String title) {
this.tabTitle = title;
}
public PullRefreshLayout getTabPullRefresh() {
return this.tabPullRefresh;
}
}
我的标签适配器
public class TabPagerAdapter extends FragmentStatePagerAdapter {
private CGController controller;
private List<Object> items;
public TabPagerAdapter(FragmentManager fm, CGController controller, List<Object> items) {
super(fm);
this.controller = controller;
this.items = items;
}
@Override
public int getCount() {
return items.size();
}
@Override
public Fragment getItem(int num) {
return (TabRecyclerHolder)items.get(num);
}
@Override
public String getPageTitle(int num){
return ((TabRecyclerHolder)items.get(num)).getTabTitle();
}
}
处理代码
public void viewInbox() {
/** Set up the views */
receivedHolder = new TabRecyclerHolder();
receivedHolder.setTabTitle(Constants.TAB_INBOX_RECEIVED);
sentHolder = new TabRecyclerHolder();
sentHolder.setTabTitle(Constants.TAB_INBOX_SENT);
tabs.add(receivedHolder);
tabs.add(sentHolder);
/** Set up the tabs */
final ViewPager inboxViewPager = inboxFragment.getInboxViewPager();
TabLayout inboxTabLayout = inboxFragment.getInboxTabLayout();
/** Set the adapter for the view pager */
inboxViewPager.setAdapter(new TabPagerAdapter(inboxFragment.getChildFragmentManager(), controller, tabs));
/** set up the tab look and feel */
inboxTabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
inboxTabLayout.setTabMode(TabLayout.MODE_FIXED);
inboxViewPager.setOffscreenPageLimit(3);
inboxViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(inboxTabLayout));
inboxTabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
inboxViewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
/** And, display! */
inboxTabLayout.setupWithViewPager(inboxViewPager);
receivedAdapter = new RecyclerListAdapter(controller, items);
final RecyclerView receivedList = receivedHolder.getTabRecyclerHolder();
receivedList.setLayoutManager(new LinearLayoutManager(controller.getContext()));
receivedList.setAdapter(receivedAdapter);
}
有一些代码，我已经错过了，但它不是pertanent的问题。 最初查看片段时，代码完美工作。然而，由于我的应用程序包含一个单独的活动，并且仅替换了导航到的每个片段的内容视图，因此每个片段都会添加到后退堆栈中，然后在按下后退按钮时弹出。我的问题是，当导航回到这个片段时，选项卡中的视图没有被夸大，这意味着没有元素可以被访问（并且因此应用程序在试图在回收视图中显示数据时崩溃）。
我看过这个问题：TabLayout ViewPager Not Loading When Using Backstack并实现了它的建议（在设置寻呼机适配器时使用getChildFragmentManager()）但是这并没有解决我的问题。
帮助，将不胜感激！
显示java.lang.NullPointerException时试图访问应该在内部膨胀的元素该标签。如果我删除任何试图访问内部片段的代码，并让它在不崩溃的情况下显示，则它在标签内没有任何显示。 – CynePhoba12
http://pastebin.com/ECKF8VKg 片段显示并显示加载微调器，但是当应用程序下载了所有数据并尝试告诉微调器隐藏它时找不到它。 – CynePhoba12
我删除了我的评论，以免混淆您的问题。尝试记录viewInbox（）方法，并确保在重新创建片段时调用它。 – Luksprog