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I have the following problem when the screen is changed to 3 tabs and then back to 2 tabs these two tabs are blank without content anyone could help me? The code is not showing any error, when I return to the main Activity the logcat history does not report any error!
public class Cid10 extends AppCompatActivity {
public SectionsPagerAdapter mSectionsPagerAdapter;
public ViewPager mViewPager;
public Toolbar toolbar;
TabLayout tabLayout;
int j = 0;
// Favorites favorites = new Favorites();
Buscar buscar = new Buscar();
//Chapters cid = new Chapters();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SubCategory subCategory = new SubCategory();
subCategory.listobjectSubAndCategory.clear();
subCategory.Consult("SELECT id, code, description FROM subcategories where favorite = 1");
if (subCategory.listobjectSubAndCategory.size() > 0) {
j = 1;
setContentView(R.layout.activity_menu);
toolbar = findViewById(R.id.toolbar);
mViewPager = findViewById(R.id.container);
tabLayout = findViewById(R.id.tabs);
} else {
j = 2;
setContentView(R.layout.activity_menu2);
toolbar = findViewById(R.id.toolbar2);
mViewPager = findViewById(R.id.container2);
tabLayout = findViewById(R.id.tabs2);
}
setSupportActionBar(toolbar);
// 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.setAdapter(mSectionsPagerAdapter);
mSectionsPagerAdapter.notifyDataSetChanged();
mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.addOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(mViewPager));
BancoOpenHelper bancoOpenHelper = new BancoOpenHelper(getApplication());
try {
bancoOpenHelper.createDataBase();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.trash, menu);
if (buscar.BeforeOption() == 2) {
menu.findItem(R.id.action_trash).setVisible(true);
} else {
menu.findItem(R.id.action_trash).setVisible(false);
}
buscar.mMenu = menu;
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
switch (item.getItemId()) {
case R.id.action_trash:
new AlertDialog.Builder(this)
.setMessage("Deseja apagar o histórico de CID pesquisados recentemente?")
.setPositiveButton("Sim",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
buscar.DeleteList();
}
})
.setNegativeButton("não", null)
.show();
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
public PlaceholderFragment() {
}
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_menu, container, false);
return rootView;
}
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@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 (j == 1) {
switch (position) {
case 0:
return new Favorites();
case 1:
buscar = new Buscar();
return buscar;
case 2:
return new Chapters();
default:
return buscar;
}
} else {
switch (position) {
case 0:
//System.out.println(buscar);
buscar = new Buscar();
return buscar;
case 1:
return new Chapters();
default:
return buscar;
}
}
}
@Override
public int getCount() {
// Show 3 total pages.
if (j == 1) {
return 3;
} else {
return 2;
}
}
}
@SuppressLint("WrongConstant")
public void ExecSql(String sql) {
SQLiteDatabase conection;
String path = "/data/data/cid10pro.medphone.br.com.medphone/database/cid10banco";
conection = SQLiteDatabase.openDatabase(path, null, SQLiteDatabase.OPEN_READWRITE);
conection.execSQL(sql);
}
@Override
protected void onResume() {
super.onResume();
// if (j == 0) {
System.out.println("????????????????????///////// onRESUME ////////////??????????????????????");
SubCategory subCategory = new SubCategory();
subCategory.listobjectSubAndCategory.clear();
subCategory.Consult("SELECT id, code, description FROM subcategories where favorite = 1");
if (subCategory.listobjectSubAndCategory.size() < 1) {
if (j == 2) {
} else {
j = 2;
setContentView(R.layout.activity_menu2);
toolbar = null;
toolbar = findViewById(R.id.toolbar2);
mViewPager = null;
mViewPager = findViewById(R.id.container2);
tabLayout = null;
tabLayout = findViewById(R.id.tabs2);
setSupportActionBar(toolbar);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
//mViewPager.clearOnPageChangeListeners();
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager.setOffscreenPageLimit(2);
mSectionsPagerAdapter.notifyDataSetChanged();
mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
mSectionsPagerAdapter.notifyDataSetChanged();
tabLayout.addOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(mViewPager));
mSectionsPagerAdapter.notifyDataSetChanged();
}
} else {
if (j == 1) {
} else {
j = 1;
setContentView(R.layout.activity_menu);
toolbar = null;
toolbar = findViewById(R.id.toolbar);
mViewPager = null;
mViewPager = findViewById(R.id.container);
tabLayout = null;
tabLayout = findViewById(R.id.tabs);
setSupportActionBar(toolbar);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager.clearOnPageChangeListeners();
mViewPager.setAdapter(mSectionsPagerAdapter);
mSectionsPagerAdapter.notifyDataSetChanged();
mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
mSectionsPagerAdapter.notifyDataSetChanged();
tabLayout.addOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(mViewPager));
mSectionsPagerAdapter.notifyDataSetChanged();
}
// }
}
}
}
Updated publication!
– Jhonatan Moreira