среда, 24 февраля 2016 г., 11:38:12 UTC+3 пользователь Evgeniy Egorov
написал:
>
> Help! No idea how to fix crash. StackOverflow didnt help me. I can not
> reproduce this crash on emulator or my smartphone but 10% of users have
> this crash every day regularly. I use Crashelitics.
>
> I have:
> Activity contains ViewPager with three Fragments. Activity contains a
> button FloatingActionButton. Fragment contains EditText. User tap on button
> from Activity. Inside onClick of this FloatingActionButton I try to get
> text from EditText which inside Fragment. Then I have NullPointerExaption
> because of returned EditText is NULL.
>
>
> public class ADatabase extends AppCompatActivity implements
> OnFragmentInteractionListener {
>
> *// fragments insive Activity*
> final FDbTables fDbTables = FDbTables.newInstance();
> final FDbQuery fDbQuery = FDbQuery.newInstance();
> final FDbStoredQueries fDbStoredQuries = FDbStoredQueries.newInstance();
> /**
> * The {@link ViewPager} that will host the section contents.
> */
> ViewPager mViewPager;
> // three buttons
> private FloatingActionButton fabTFS;
>
> private FloatingActionButton fabRun; // <-- user tap this button
> private FloatingActionButton fabRefreshDB;
>
> public FloatingActionButton getFabRun() {
> return fabRun;
> }
>
>
> @Override
> protected void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
> setContentView(R.layout.activity_database);
>
> FragmentTransaction transaction =
> getSupportFragmentManager().beginTransaction();
> // Create the adapter that will return a fragment for each of the three
> // primary sections of the activity.
> mSectionsPagerAdapter = new
> SectionsPagerAdapter(getSupportFragmentManager());
>
> // Set up the ViewPager with the sections adapter.
> mViewPager = (ViewPager) findViewById(R.id.container);
> mViewPager.setAdapter(mSectionsPagerAdapter);
> // Commit the transaction
> transaction.commit();
>
> tvDbHeader = (TextView) findViewById(R.id.tvDbHeader);
> tvDbTablesCnt = (TextView) findViewById(R.id.tvDbTablesCnt);
>
>
> TabLayout tabLayout = (TabLayout) findViewById(R.id.tabanim_tabs);
> tabLayout.setupWithViewPager(mViewPager);
>
> fabRun = (FloatingActionButton) findViewById(R.id.fabRun);
>
> fabRun.setEnabled(false);
>
>
> ...
>
>
> }
>
>
>
> public void run(final View view) {
> final String sql = fDbQuery.getEtSql().getText().toString(); // <-- here
> NPE. because fDbQuery.getEtSql() sometimes is NULL. WHY???
> ...
> }
>
>
> /**
> * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
> * one of the sections/tabs/pages.
> */
> public class SectionsPagerAdapter extends FragmentPagerAdapter {
>
>
> @Override
> public Fragment getItem(int position) {
> // getItem is called to instantiate the fragment for the given page.
> // Return a PlaceholderFragment (defined as a static inner class
> below).
> if (position == 0) return fDbTables;
> if (position == 1) return fDbQuery;
> if (position == 2) return fDbStoredQuries;
> throw new IllegalArgumentException("Must be only three fragments. But
> position=" + position + ". Check fragments.");
> }
>
> @Override
> public int getCount() { return 3; }
>
> @Override
> public CharSequence getPageTitle(int position) {
> switch (position) {
> case 0: return getString(R.string.Tables);
> case 1: return getString(R.string.SQL_query);
> case 2: return getString(R.string.Saved_queries);
> }
> return null;
> }
> }
>
> }
>
>
>
> public class FDbQuery extends Fragment {
>
> public static FDbQuery newInstance() {
> FDbQuery fragment = new FDbQuery();
> Bundle args = new Bundle();
> fragment.setArguments(args);
> return fragment;
> }
>
>
>
> private EditText etSql; // I need text from this View
>
> public EditText getEtSql() {
> return etSql;
>
> }
>
> @Override
> public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle
> savedInstanceState) {
> // Inflate the layout for this fragment
> View view = inflater.inflate(R.layout.fragment_fdb_query, container,
> false);
> return view;
> }
>
>
> @Override
> public void onResume() { // here could be onCreateView or onViewCreated
> but useless
> super.onResume();
>
> etSql = (EditText) getView().findViewById(R.id.etSql);
>
> ((ADatabase) getActivity()).getFabRun().setEnabled(true);
>
> }
>
> }
>
>
>
> I can not understand. Why some users have the crash? What is wrong?
>
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