E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: org.example.magnusluca.drawertestapp, PID: 3624
java.lang.NullPointerException: Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference
没修改前代码：
public class OrderManagerFragmentPagerAdapter extends FragmentPagerAdapter {
private FollowingResult.DataEntity.CountEntity countEntity;
public OrderManagerFragmentPagerAdapter(FragmentManager fm, FollowingResult.DataEntity.CountEntity countEntity) {
super(fm);
this.countEntity = countEntity;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
//super.destroyItem(container, position, object);
}
@Override public Fragment getItem(int position) {
OrderManagerFragment badgeRefreshListener = OrderManagerFragment
.this;
String strTabTitle = TITLES[position];
switch (strTabTitle) {
case "新订单":
return NewOrderFragment.newInstance(badgeRefreshListener);
case "跟踪中":
return NewOrderFragment.newInstance(badgeRefreshListener);
case "转出":
return NewOrderFragment.newInstance(badgeRefreshListener);
case "成交":
return NewOrderFragment.newInstance(badgeRefreshListener);
case "流失":
return NewOrderFragment.newInstance(badgeRefreshListener);
case "无效":
return NewOrderFragment.newInstance(badgeRefreshListener);
default:
return null;
}
}
@Override public CharSequence getPageTitle(int position) {
return TITLES[position % TITLES.length];
}
@Override public int getCount() {
return TITLES.length;
}
}
出问题主要出现在标红的地方，代码修改过为
return new NewOrderFragment();
问题解决
stackoverflow上面解决方案：http://stackoverflow.com/questions/26822516/how-to-display-3-fragments-inside-pageviewer
