I am using dispatchKeyEvent in my FragmentActivity and calling one of my fragments method. Following is code I am using for my FragmentActivity:
public class ViewPagerFragment extends FragmentActivity{
MyAdapter mAdapter;
ViewPager mPager;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.viewpager_layout);
mAdapter = new MyAdapter(getSupportFragmentManager());
mPager = (ViewPager) findViewById(R.id.pager);
mPager.setAdapter(mAdapter);
mPager.setCurrentItem(0);
}
public void onResume() {
super.onResume();
}
public void onPause() {
super.onPause();
}
public void onDestroy() {
super.onDestroy();
}
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
if(event.getKeyCode() == 66){
FragmentPagerAdapter fragmentPagerAdapter = (FragmentPagerAdapter) mPager.getAdapter();
((SecondFragment)fragmentPagerAdapter.getItem(1)).myOnKeyDown(input_str);
}
return super.dispatchKeyEvent(event);
}
public void onNewIntent(Intent intent) {
super.onNewIntent(getIntent());
}
public static class MyAdapter extends FragmentPagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
@Override
public int getCount() {
return 2;
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new FirstFragment();
case 1:
return new SecondFragment();
default:
return null;
}
}
}
}
Following is code for my SecondFragment.
public class SecondFragment extends Fragment{
ProgressBar spinner;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public void onResume(){
super.onResume();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.secondfragment_layout, container, false);
spinner = (ProgressBar) view.findViewById(R.id.spinner);
return view;
}
public void myOnKeyDown(String barcode){
// following line gives NullPointerException
spinner.setVisibility(ProgressBar.VISIBLE);
}
}
In my SecondFragment's onCreateView i have initialized ProgressBar which is in SecondFrament layout file. But it always become null when i call myOnKeyDown from dispatchKeyEvent in my FragmentActivity. Why is it so and how can i solve it? Thanks in advance.
