Issue
I have three fragment in NavigationBarView.
First fragment has gridview(gridview data is dynamic by network search).
But when I go to second fragment and back to first fragment, the gridview in first fragment is clear.
How can I prevent the gridview's data from being cleared?
Here my navigation code.
// in global variable
NavigationBarView navigationBarView;
FirstFragment firstFragment;
SecondFragment secondFragment;
ThirdFragment thirdFragment;
// ...
firstFragment = new FirstFragment();
secondFragment= new SecondFragment();
thirdFragment = new ThirdFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.containers, firstFragment).commit();
navigationBarView = findViewById(R.id.bottom_navigationview);
navigationBarView.setKeepScreenOn(true);
navigationBarView.setOnItemSelectedListener(new NavigationBarView.OnItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch(item.getItemId())
{
case R.id.menu_first:
getSupportFragmentManager().beginTransaction().replace(R.id.containers, firstFragment).commit();
return true;
case R.id.menu_second:
getSupportFragmentManager().beginTransaction().replace(R.id.containers, secondFragment).commit();
return true;
case R.id.menu_third:
getSupportFragmentManager().beginTransaction().replace(R.id.containers, thirdFragment).commit();
return true;
}
return false;
}
});
Solution
addToBackStack method when replacing one fragment by another:
getFragmentManager().beginTransaction().replace(R.id.content_frame, fragment).addToBackStack("my_fragment").commit();
and also use onbackpressed to back with state using back button
@Override
public void onBackPressed() {
if (getParentFragmentManager().getBackStackEntryCount() > 0) {
getParentFragmentManager().popBackStack();
} else {
super.onBackPressed();
}
}
use same popBackStack() to navigate from navigationbar also
Answered By - MAYUR SANCHETI
Answer Checked By - Willingham (JavaFixing Volunteer)