我的自定义PageAdapter类中有以下错误，该类继承自 FragmentStatePagerAdapter，我有10个选项卡，我的产品被找到，PageAdaptar有2个方法覆盖公共CharSequence getPageTitle，public int getCount（）和构造函数。以下错误标志着我： - ＆gt; 应用程序的PagerAdapter在不调用PagerAdapter＃notifyDataSetChanged的情况下更改了适配器的内容！适配器元素的估计数量：0，找到：10寻呼机
<?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"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.TabLayout
android:id="@+id/tablayout_menu"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/blanco"
android:scrollbars="horizontal"
app:tabGravity="fill"
app:tabSelectedTextColor="@color/colorPrimaryDark"
app:tabTextColor="@color/negro"
app:tabMode="scrollable" />
<android.support.v4.view.ViewPager
android:id="@+id/viewPager_menu"
android:paddingBottom="50dp"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/tablayout_perfil"/>
</LinearLayout>
立即有我的自定义适配器，根据我返回片段的位置
public class CostumAdapter2 extends FragmentStatePagerAdapter {
public CostumAdapter2(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
Bundle bundle = new Bundle();
switch (position) {
case 0:
FragmentBebidas fragmentBebidas = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas.setArguments(bundle);
return fragmentBebidas;
case 1:
FragmentBebidas fragmentBebidas2 = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas2.setArguments(bundle);
return fragmentBebidas2;
case 2:
FragmentBebidas fragmentBebidas3 = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas3.setArguments(bundle);
return fragmentBebidas3;
case 3:
FragmentBebidas fragmentBebidas4 = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas4.setArguments(bundle);
return fragmentBebidas4;
case 4:
FragmentBebidas fragmentBebidas5 = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas5.setArguments(bundle);
return fragmentBebidas5;
case 5:
FragmentBebidas fragmentBebidas6 = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas6.setArguments(bundle);
return fragmentBebidas6;
case 6:
FragmentBebidas fragmentBebidas7 = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas7.setArguments(bundle);
return fragmentBebidas7;
case 7:
FragmentBebidas fragmentBebidas8 = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas8.setArguments(bundle);
return fragmentBebidas8;
case 8:
FragmentBebidas fragmentBebidas9 = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas9.setArguments(bundle);
return fragmentBebidas9;
case 9:
FragmentBebidas fragmentBebidas10 = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas10.setArguments(bundle);
return fragmentBebidas10;
}
return null;
}
@Override
public CharSequence getPageTitle(int position) {
return menuTabs.get(position).toString();
}
@Override
public int getCount() {
return menuTabs.size();
}
}
这是执行下一个操作以扩充包含选项卡
的片段的位置ahBottomNavigation.setOnTabSelectedListener(new AHBottomNavigation.OnTabSelectedListener() {
@Override
public boolean onTabSelected(int position, boolean wasSelected) {
// Do something cool here...
switch (position) {
case 0:
//seteando el texto del menu
tituloActivity.setText("Menú");
iconBack.setVisibility(View.INVISIBLE);
//Toast.makeText(getApplicationContext(), "Menú", Toast.LENGTH_LONG).show();
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
MenuViewController menuViewController = new MenuViewController();
/**menuViewController.setArguments(bundle);**/
fragmentTransaction.add(R.id.myFragemnt,menuViewController);
fragmentTransaction.replace(R.id.myFragemnt, menuViewController);
fragmentTransaction.commit();
return true;
case 1:
在这部分中我有setOnTabSelectedListener事件
rootView = inflater.inflate(R.layout.menu_layout, container, false);
tabLayout = (TabLayout) rootView.findViewById(R.id.tablayout_menu);
viewPager = (ViewPager) rootView.findViewById(R.id.viewPager_menu);
CostumAdapter2 costumAdapter = new CostumAdapter2(getActivity().getSupportFragmentManager());
viewPager.setAdapter(costumAdapter);
costumAdapter.notifyDataSetChanged();
tabLayout.setupWithViewPager(viewPager);
tabLayout.post(new Runnable() {
@Override
public void run() {
tabLayout.setupWithViewPager(viewPager);
}
});
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
});
return rootView;
}
> 04-17 09:25:56.041: E/AndroidRuntime(30450): FATAL EXCEPTION: main > 04-17 09:25:56.041: E/AndroidRuntime(30450): Process: > com.blueicon.romerito, PID: 30450 04-17 09:25:56.041: > E/AndroidRuntime(30450): java.lang.IllegalStateException: The > application's PagerAdapter changed the adapter's contents without > calling PagerAdapter#notifyDataSetChanged! Expected adapter item > count: 0, found: 10 Pager id: com.blueicon.romerito:id/viewPager_menu > Pager class: class android.support.v4.view.ViewPager Problematic > adapter: class > com.blueicon.romerito.controller.menuprincipal.fragmentosmenu.MenuViewController$CostumAdapter2 > 04-17 09:25:56.041: E/AndroidRuntime(30450): at > android.support.v4.view.ViewPager.populate(ViewPager.java:1167) 04-17 > 09:25:56.041: E/AndroidRuntime(30450): at > android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:668) > 04-17 09:25:56.041: E/AndroidRuntime(30450): at > android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:630) > 04-17 09:25:56.041: E/AndroidRuntime(30450): at > android.support.v4.view.ViewPager.setCurrentItem(ViewPager.java:611) > 04-17 09:25:56.041: E/AndroidRuntime(30450): at > android.support.design.widget.TabLayout$ViewPagerOnTabSelectedListener.onTabSelected(TabLayout.java:2178) > 04-17 09:25:56.041: E/AndroidRuntime(30450): at > android.support.design.widget.TabLayout.dispatchTabSelected(TabLayout.java:1155) > 04-17 09:25:56.041: E/AndroidRuntime(30450): at > android.support.design.widget.TabLayout.selectTab(TabLayout.java:1148) > 04-17 09:25:56.041: E/AndroidRuntime(30450): at > android.support.design.widget.TabLayout.selectTab(TabLayout.java:1118) > 04-17 09:25:56.041: E/AndroidRuntime(30450): at > android.support.design.widget.TabLayout.populateFromPagerAdapter(TabLayout.java:916) > 04-17 09:25:56.041: E/AndroidRuntime(30450): at > android.support.design.widget.TabLayout.setPagerAdapter(TabLayout.java:900) > 04-17 09:25:56.041: E/AndroidRuntime(30450): at > android.support.design.widget.TabLayout.setupWithViewPager(TabLayout.java:813) > 04-17 09:25:56.041: E/AndroidRuntime(30450): at > android.support.design.widget.TabLayout.setupWithViewPager(TabLayout.java:774) > 04-17 09:25:56.041: E/AndroidRuntime(30450): at > android.support.design.widget.TabLayout.setupWithViewPager(TabLayout.java:752) > 04-17 09:25:56.041: E/AndroidRuntime(30450): at > com.blueicon.romerito.controller.menuprincipal.fragmentosmenu.MenuViewController$1.run(MenuViewController.java:70) > 04-17 09:25:56.041: E/AndroidRuntime(30450): at > android.os.Handler.handleCallback(Handler.java:739) 04-17 > 09:25:56.041: E/AndroidRuntime(30450): at > android.os.Handler.dispatchMessage(Handler.java:95) 04-17 > 09:25:56.041: E/AndroidRuntime(30450): at > android.os.Looper.loop(Looper.java:158) 04-17 09:25:56.041: > E/AndroidRuntime(30450): at > android.app.ActivityThread.main(ActivityThread.java:7229) 04-17 > 09:25:56.041: E/AndroidRuntime(30450): at > java.lang.reflect.Method.invoke(Native Method) 04-17 09:25:56.041: > E/AndroidRuntime(30450): at > com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) > 04-17 09:25:56.041: E/AndroidRuntime(30450): at > com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
答案 0 :(得分：0)
更新CostumAdapter2，如下所示：
public class CostumAdapter2 extends FragmentStatePagerAdapter {
final int PAGE_COUNT = 10;
private String tabTitles[] = new String[] {"TAB0", "TAB1", "TAB2", "TAB3", "TAB4", "TAB5", "TAB6", "TAB7", "TAB8", "TAB9"};
public CostumAdapter2(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
Bundle bundle = new Bundle();
switch (position) {
case 0:
FragmentBebidas fragmentBebidas = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas.setArguments(bundle);
return fragmentBebidas;
case 1:
FragmentBebidas fragmentBebidas2 = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas2.setArguments(bundle);
return fragmentBebidas2;
case 2:
FragmentBebidas fragmentBebidas3 = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas3.setArguments(bundle);
return fragmentBebidas3;
case 3:
FragmentBebidas fragmentBebidas4 = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas4.setArguments(bundle);
return fragmentBebidas4;
case 4:
FragmentBebidas fragmentBebidas5 = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas5.setArguments(bundle);
return fragmentBebidas5;
case 5:
FragmentBebidas fragmentBebidas6 = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas6.setArguments(bundle);
return fragmentBebidas6;
case 6:
FragmentBebidas fragmentBebidas7 = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas7.setArguments(bundle);
return fragmentBebidas7;
case 7:
FragmentBebidas fragmentBebidas8 = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas8.setArguments(bundle);
return fragmentBebidas8;
case 8:
FragmentBebidas fragmentBebidas9 = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas9.setArguments(bundle);
return fragmentBebidas9;
case 9:
FragmentBebidas fragmentBebidas10 = new FragmentBebidas();
bundle.putInt("ID", Integer.parseInt(listMenu.get(position).getId()));
fragmentBebidas10.setArguments(bundle);
return fragmentBebidas10;
}
return null;
}
@Override
public CharSequence getPageTitle(int position) {
return tabTitles[position];
}
@Override
public int getCount() {
return PAGE_COUNT;
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
}
仅供参考，根据您的需要更改tabTitles值(TAB0, TAB1.....);
更新onCreateView()，如下所示：
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.menu_layout, container, false);
tabLayout = (TabLayout) rootView.findViewById(R.id.tablayout_menu);
viewPager = (ViewPager) rootView.findViewById(R.id.viewPager_menu);
CostumAdapter2 costumAdapter = new CostumAdapter2(getActivity().getSupportFragmentManager());
viewPager.setAdapter(costumAdapter);
tabLayout.setupWithViewPager(viewPager);
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
});
return rootView;
}
希望这会有所帮助〜
答案 1 :(得分：0)
您将MenuViewController.CostumAdapter2声明为内部类。当您更改MenuViewController.menuTabs的内容时，您还必须在每个适配器上调用notifyDataSetChanged()。
由于您在MenuViewController中甚至没有引用它，这可能很难。
尝试在MenuViewController内将适配器实现为 Singleton ，并在更改notifyDataSetChanged()时调用menuTabs。