9
我已经搜索了StackOverflow和网络以解答此问题的答案，但找不到答案。当我在姜饼上运行我的应用程序时，它运行良好。但是当我在4.2.2上运行它时，出现此错误：java.lang.IllegalStateException Cannot perform this operation because the connection pool has been closed 我有一个包含两个片段的SherlockFragmentActivity。Android错误：无法执行此操作，因为连接池已关闭
片段1：
public final class TodoFragment extends SherlockListFragment {
NotesDbAdapter db;
private static final int DELETE_ID = Menu.FIRST + 1;
public static TodoFragment newInstance(String s) {
TodoFragment fragment = new TodoFragment();
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
db = new NotesDbAdapter(getActivity());
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (container == null) {
return null;
}
return ll;
}
片段2：
public final class NotesFragment extends SherlockListFragment {
NotesDbAdapter db;
private static final int ACTIVITY_EDIT = 1;
private static final int DELETE_ID = Menu.FIRST + 1;
public static NotesFragment newInstance(String content) {
NotesFragment fragment = new NotesFragment();
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
db = new NotesDbAdapter(getActivity());
db.open();
if (db.fetchAllNotes().getCount() == 0) {
doWelcomeMessage();
}
db.close();
}
private void doWelcomeMessage() {
// Show welcome dialog
startActivity(new Intent(getActivity(), NotesWelcome.class));
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (container == null) {
return null;
}
db = new NotesDbAdapter(getActivity());
db.open();
if (db.fetchAllNotes().getCount() == 0) {
doWelcomeMessage();
}
db.close();
return ll;
}
SherlockFragmentActivity：
public class NotesFragmentActivity extends SherlockFragmentActivity {
ViewPager mViewPager;
TabsAdapter mTabsAdapter;
TextView tabCenter;
TextView tabText;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mViewPager = new ViewPager(this);
mViewPager.setId(R.id.pager);
setContentView(mViewPager);
ActionBar bar = getSupportActionBar();
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
mTabsAdapter = new TabsAdapter(this, mViewPager);
mTabsAdapter.addTab(bar.newTab().setText("Notes"), NotesFragment.class,
null);
mTabsAdapter.addTab(bar.newTab().setText("Todo List"),
TodoFragment.class, null);
}
public static class TabsAdapter extends FragmentPagerAdapter implements
ActionBar.TabListener, ViewPager.OnPageChangeListener {
private final Context mContext;
private final ActionBar mActionBar;
private final ViewPager mViewPager;
private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
static final class TabInfo {
private final Class<?> clss;
private final Bundle args;
TabInfo(Class<?> _class, Bundle _args) {
clss = _class;
args = _args;
}
}
public TabsAdapter(SherlockFragmentActivity activity, ViewPager pager) {
super(activity.getSupportFragmentManager());
mContext = activity;
mActionBar = activity.getSupportActionBar();
mViewPager = pager;
mViewPager.setAdapter(this);
mViewPager.setOnPageChangeListener(this);
}
public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args) {
TabInfo info = new TabInfo(clss, args);
tab.setTag(info);
tab.setTabListener(this);
mTabs.add(info);
mActionBar.addTab(tab);
notifyDataSetChanged();
}
@Override
public int getCount() {
return mTabs.size();
}
@Override
public Fragment getItem(int position) {
TabInfo info = mTabs.get(position);
return Fragment.instantiate(mContext, info.clss.getName(),
info.args);
}
public void onPageScrolled(int position, float positionOffset,
int positionOffsetPixels) {
}
public void onPageSelected(int position) {
mActionBar.setSelectedNavigationItem(position);
}
public void onPageScrollStateChanged(int state) {
}
public void onTabSelected(Tab tab, FragmentTransaction ft) {
Object tag = tab.getTag();
for (int i = 0; i < mTabs.size(); i++) {
if (mTabs.get(i) == tag) {
mViewPager.setCurrentItem(i);
}
}
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
}
}
我一直停留在这个为小时（不笑话），和非常感谢任何帮助。 再次感谢。
发布整个堆栈跟踪。此错误意味着应用程序在某处关闭了数据库，并在此之后发生了另一个数据库连接，但db已关闭 – kinghomer
您必须删除关闭操作。尝试通过删除关闭（）。这个错误是由于关闭数据库。 – Nepster