我試圖使用ViewPager
一個Fragment
內得到內片段ViewPager導致NullPointerException異常
03-01 15:23:05.375 3937-3937/com.example.android.navigationdrawerexample E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at com.example.android.navigationdrawerexample.SpaFragment.onCreateView(SpaFragment.java:50)
at android.app.Fragment.performCreateView(Fragment.java:1695)
代碼:
public class SpaFragment extends Fragment {
public SpaFragment(){}
private SpaList mSpa;
private TabHost tabs;
private FragmentActivity mFragmentActivity;
private View rootView;
public void setSpa(SpaList s)
{
mSpa=s;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment_spa, container, false);
ViewPager pager = (ViewPager) rootView.findViewById(R.id.pager);
pager.setAdapter(new MyPagerAdapter(mFragmentActivity.getSupportFragmentManager()));
return rootView;
}
@Override
public void onAttach(Activity activity) {
mFragmentActivity = (FragmentActivity) activity;
Log.d("ACTIVITY on attach"+mFragmentActivity,"\n");
super.onAttach(activity);
}
private class MyPagerAdapter extends FragmentPagerAdapter {
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public CharSequence getPageTitle(int position) {
return "Title " + position;
}
@Override
public android.support.v4.app.Fragment getItem(int pos) {
switch(pos) {
case 0: return FirstFragment.newInstance("FirstFragment, Instance 1");
case 1: return SecondFragment.newInstance("SecondFragment, Instance 1");
default: return FirstFragment.newInstance("ThirdFragment, Default");
}
}
@Override
public int getCount() {
return 2;
}
}
}
刪除'Log.d( 「上創建活動」,將String.valueOf(mFragmentActivity));' –
我們需要您的logcat的輸出。 –
我刪除Log.d,仍然得到同樣的錯誤 – SERG