TabLayout - ViewPager - 片段
TabLayout - ViewPager - Fragment
我的 ViewPager 及其包含的片段有问题。我有 2 个菜单(A 和 B),我的主页直接是 A。当我单击包含一个 TabLayout 的菜单 B 片段时,它包含一个 ViewPager 自己三个片段(每个片段包含一个带有 Lorem ipsum 的简单 TextView)。
ViewPager 的 3 个片段是正确的,但是如果我单击菜单 A 并再次单击菜单 B,我没有任何内容。片段 1 和 2 上的任何内容与第 3 个仍然有文本,如果我 return 到片段 1 读取收入(对片段 2 没有任何内容)。
这是我的代码:
菜单 B (FragmentTabLayout)
public class TabLayoutFragment extends Fragment {
private static final String ARG_TEXT = "ARG_TEXT";
private static final String ARG_COLOR = "ARG_COLOR";
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
public TabLayoutFragment() {
// Required empty public constructor
}
public static TabLayoutFragment newInstance(String text, int color) {
Bundle args = new Bundle();
args.putString(ARG_TEXT, text);
args.putInt(ARG_COLOR, color);
TabLayoutFragment tabLayoutFragment = new TabLayoutFragment();
tabLayoutFragment.setArguments(args);
return tabLayoutFragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
setHasOptionsMenu(true);
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_tab_layout, container, false);
toolbar = (Toolbar) view.findViewById(R.id.toolbar);
((AppCompatActivity)getActivity()).setSupportActionBar(toolbar);
toolbar.setBackgroundColor(getArguments().getInt(ARG_COLOR));
toolbar.setTitle(getArguments().getString(ARG_TEXT));
viewPager = (ViewPager) view.findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) view.findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
tabLayout.setBackgroundColor(getArguments().getInt(ARG_COLOR));
tabLayout.setSelectedTabIndicatorColor(Color.WHITE);
return view;
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.tab_menu, menu);
super.onCreateOptionsMenu(menu, inflater);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getActivity().getSupportFragmentManager());
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
//private final List<TabFragment> mFragmentList = new ArrayList<>();
//private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return TabFragment.newInstance("Fragment 2-1");
case 1:
return TabFragment.newInstance("Fragment 2-2");
case 2:
return TabFragment.newInstance("Fragment 2-3");
default:
return TabFragment.newInstance("Fragment Default");
}
}
@Override
public int getCount() {
//return mFragmentList.size();
return 3;
}
}
}
ViewPager 中的片段:
public class TabFragment extends Fragment {
private static final String ARG_TEXT = "ARG_TEXT";
private TextView tv;
public TabFragment() {
// Required empty public constructor
}
public static TabFragment newInstance(String text) {
Bundle args = new Bundle();
args.putString(ARG_TEXT, text);
TabFragment tabFragment= new TabFragment();
tabFragment.setArguments(args);
return tabFragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_tab, container, false);
tv = (TextView) view.findViewById(R.id.tv);
return view;
}
}
布局 FragmentTabLayout :
<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"
android:orientation="vertical">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<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/ThemeOverlay.AppCompat.Light" />
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="fixed"
app:tabGravity="fill"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</android.support.design.widget.CoordinatorLayout>
布局选项卡片段:
<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"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
tools:context="com.application.myapplication.TabFragment">
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
>
<TextView
android:id="@+id/tv"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="@string/lorem_ipsum"
/>
</android.support.v4.widget.NestedScrollView>
</LinearLayout>
您可以扩展您的 ViewPagerAdapter
FragmentStatePagerAdapter
而不是
FragmentPagerAdapter
我有同样的问题,它对我有用。
在我看来,更好的方法是您应该尝试对嵌套片段使用 childFragmentManager
这是一个简单的例子:
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getActivity().getChildFragmentManager());
viewPager.setAdapter(adapter);
}
希望它能解决您的问题。
我的 ViewPager 及其包含的片段有问题。我有 2 个菜单(A 和 B),我的主页直接是 A。当我单击包含一个 TabLayout 的菜单 B 片段时,它包含一个 ViewPager 自己三个片段(每个片段包含一个带有 Lorem ipsum 的简单 TextView)。 ViewPager 的 3 个片段是正确的,但是如果我单击菜单 A 并再次单击菜单 B,我没有任何内容。片段 1 和 2 上的任何内容与第 3 个仍然有文本,如果我 return 到片段 1 读取收入(对片段 2 没有任何内容)。
这是我的代码:
菜单 B (FragmentTabLayout)
public class TabLayoutFragment extends Fragment {
private static final String ARG_TEXT = "ARG_TEXT";
private static final String ARG_COLOR = "ARG_COLOR";
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
public TabLayoutFragment() {
// Required empty public constructor
}
public static TabLayoutFragment newInstance(String text, int color) {
Bundle args = new Bundle();
args.putString(ARG_TEXT, text);
args.putInt(ARG_COLOR, color);
TabLayoutFragment tabLayoutFragment = new TabLayoutFragment();
tabLayoutFragment.setArguments(args);
return tabLayoutFragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
setHasOptionsMenu(true);
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_tab_layout, container, false);
toolbar = (Toolbar) view.findViewById(R.id.toolbar);
((AppCompatActivity)getActivity()).setSupportActionBar(toolbar);
toolbar.setBackgroundColor(getArguments().getInt(ARG_COLOR));
toolbar.setTitle(getArguments().getString(ARG_TEXT));
viewPager = (ViewPager) view.findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) view.findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
tabLayout.setBackgroundColor(getArguments().getInt(ARG_COLOR));
tabLayout.setSelectedTabIndicatorColor(Color.WHITE);
return view;
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.tab_menu, menu);
super.onCreateOptionsMenu(menu, inflater);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getActivity().getSupportFragmentManager());
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
//private final List<TabFragment> mFragmentList = new ArrayList<>();
//private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return TabFragment.newInstance("Fragment 2-1");
case 1:
return TabFragment.newInstance("Fragment 2-2");
case 2:
return TabFragment.newInstance("Fragment 2-3");
default:
return TabFragment.newInstance("Fragment Default");
}
}
@Override
public int getCount() {
//return mFragmentList.size();
return 3;
}
}
}
ViewPager 中的片段:
public class TabFragment extends Fragment {
private static final String ARG_TEXT = "ARG_TEXT";
private TextView tv;
public TabFragment() {
// Required empty public constructor
}
public static TabFragment newInstance(String text) {
Bundle args = new Bundle();
args.putString(ARG_TEXT, text);
TabFragment tabFragment= new TabFragment();
tabFragment.setArguments(args);
return tabFragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_tab, container, false);
tv = (TextView) view.findViewById(R.id.tv);
return view;
}
}
布局 FragmentTabLayout :
<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"
android:orientation="vertical">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<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/ThemeOverlay.AppCompat.Light" />
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="fixed"
app:tabGravity="fill"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</android.support.design.widget.CoordinatorLayout>
布局选项卡片段:
<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"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
tools:context="com.application.myapplication.TabFragment">
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
>
<TextView
android:id="@+id/tv"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="@string/lorem_ipsum"
/>
</android.support.v4.widget.NestedScrollView>
</LinearLayout>
您可以扩展您的 ViewPagerAdapter
FragmentStatePagerAdapter
而不是
FragmentPagerAdapter
我有同样的问题,它对我有用。
在我看来,更好的方法是您应该尝试对嵌套片段使用 childFragmentManager
这是一个简单的例子:
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getActivity().getChildFragmentManager());
viewPager.setAdapter(adapter);
}
希望它能解决您的问题。