在NavigationDrawer中,我正在拍摄两个碎片.在每个片段中,我都有标签滑块.当我第一次点击数据时,两个片段中都有数据,但是当我从一个片段进入另一个片段时,两个片段中的数据都为空.我检查了片段的保存状态,但问题仍未解决.知道我们如何解决这个问题吗?
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
if (navigationView != null) {
setupDrawerContent(navigationView);
mFragmentManager = getSupportFragmentManager();
mFragmentTransaction = mFragmentManager.beginTransaction();
mFragmentTransaction.replace(R.id.frame, new LoginFragment()).commit();
}
private void setupDrawerContent(NavigationView navigationView) {
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
System.out.println("Navigation Drawer Item Clciked ---->" + navDrawerClickedItem);
Fragment fragment = null;
switch (menuItem.getItemId()) {
case R.id.roof:
if (navDrawerClickedItem == menuItem.getItemId()) {
mDrawerLayout.closeDrawer(Gravity.LEFT);
System.out.println("New roof Fragment already loaded");
} else {
navDrawerClickedItem = menuItem.getItemId();
FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.frame, new RoofTabFragment()).commit();
System.out.println("New roof Fragment Created");
}
break;
case R.id.floor:
if (navDrawerClickedItem == menuItem.getItemId()) {
mDrawerLayout.closeDrawer(Gravity.LEFT);
System.out.println("Floor Fragment already loaded");
} else {
navDrawerClickedItem = menuItem.getItemId();
FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.frame, new FloorTabFragment()).commit();
System.out.println("Floor Fragment Created");
}
break;
case R.id.signOut:
LogMeOut();
break;
}
if (fragment != null) {
mFragmentManager.beginTransaction().replace(R.id.frame_container, fragment).commit();
} else {
Log.e("MainActivity", "Error in creating fragment");
}
menuItem.setChecked(true);
setTitle(menuItem.getTitle());
mDrawerLayout.closeDrawers();
return false;
}
});
}
最佳答案 通过在viewPager.setAdapter(new MyAdapter(getChildFragmentManager()))中将getFragmentManager()替换为getChildFragmentManager()来解决问题.