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我试图用一个游标加载器实现FragmentPagerAdapter
。但是,我似乎无法访问getItem()
内的游标,因为在尝试访问游标时,因为它尚未在onLoadFinished()
中设置,所以我得到一个空引用错误。FragmentPagerAdapter实现LoaderManager.LoaderCallbacks <Cursor>
将onLoadFinished()
不完整,直到getItem()
完成?
有没有更好的方法来加载游标数据?我可以直接查询ContentProvider
并将结果存储在我的光标中,但认为装载程序是首选。
public class MyAdapter extends FragmentPagerAdapter implements LoaderManager.LoaderCallbacks<Cursor>{
private Cursor cursor;
public MyAdapter(FragmentManager fm) {
super(fm);
getLoaderManager().initLoader(0, null, this);
}
@Override
public int getCount() {
return 13;
}
@Override
public Fragment getItem(int position) {
Bundle args = new Bundle();
cursor.moveToPosition(position);
args.putString(TextViewFragment.TITLE, cursor.getString(1));
args.putInt(TextViewFragment.POSITION_KEY, position);
return TextViewFragment.newInstance(args);
}
@Override
public CharSequence getPageTitle(int position) {
return "Fragment # " + position;
}
@Override
public Loader<Cursor> onCreateLoader(int arg0, Bundle arg1) {
// TODO Auto-generated method stub
CursorLoader cursorLoader = new CursorLoader(getActivity(), TestContentProvider.CONTENT_URI, null, null, null, null);
return cursorLoader;
}
@Override
public void onLoadFinished(Loader<Cursor> arg0, Cursor arg1) {
// TODO Auto-generated method stub
cursor = arg1;
//throw new IllegalArgumentException("We are HEREHEREHEREHEREHEREHEREHEREHEREHEREHEREHEREHEREHEREHEREHEREHEREHEREHEREHEREHEREHEREHEREHERE");
}
@Override
public void onLoaderReset(Loader<Cursor> arg0) {
// TODO Auto-generated method stub
}
}
}
我会试试看,谢谢。 – user2110291 2013-02-26 08:47:21