I cant set value for start page (position 0)
I mean QuestionPagerAdapter.tv.setText("default") must work in MainActivity's onPageSelected(int position) case 0: but it gives nullpoint. but it works for position > 0
PagerAdapter:
public class QuestionPagerAdapter extends PagerAdapter{
public static TextView tv;
@Override
public Object instantiateItem(View collection, int pos) {
LayoutInflater inflater = (LayoutInflater) collection.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View page = inflater.inflate(R.layout.page_quiz, null);
tv = (TextView)page.findViewById(R.id.questionText);
}
}
MainActivity:
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.activity_main);
mPager = (ViewPager)findViewById(R.id.pager);
QuestionPagerAdapter mAdapter = new QuestionPagerAdapter();
mPager.setAdapter(mAdapter);
@Override
public void onPageSelected(int position) {
switch (position) {
case 0:
// QuestionPagerAdapter.tv.setText("default"); => doesnt works
break;
default:
QuestionPagerAdapter.tv.setText("default"); => works
break;
}