我正在製作一個具有導航抽屜的應用程序。在這些片段中可以去其他活動。如果我點擊後退按鈕,我想返回到導航抽屜的當前片段。例如,我有一個片段消息,然後單擊指定聊天中的片段,以便我會看到詳細信息。然後我想再回到消息片段。我正在考慮使用片段後臺堆棧,但我不確定是否有正確的方法來做到這一點。這是我的代碼,我如何在導航抽屜中創建碎片。Android - 從活動的片段之間的導航
Fragment fragment = null;
Class fragmentClass = null;
android.support.v4.app.FragmentManager fm = getSupportFragmentManager();
switch (menuItem.getItemId()) {
case R.id.nav_profile:
fragmentClass = HomeFragment.class;
break;
case R.id.nav_inbox:
fragmentClass = ChatFragment.class;
break;
case R.id.nav_map:
fragmentClass = MapFragment.class;
break;
case R.id.nav_dog_breed:
fragmentClass = DogBreedsFragment.class;
break;
case R.id.nav_reminder:
fragmentClass = ReminderFragment.class;
break;
case R.id.nav_favourite_dog_breeds:
fragmentClass = FavouriteDogBreedsFragment.class;
break;
case R.id.nav_help:
Intent intent = new Intent(MainActivity.this, HelpActivity.class);
startActivity(intent);
finish();
break;
case R.id.nav_settings:
Intent intent2 = new Intent(MainActivity.this, SettingsActivity.class);
startActivity(intent2);
finish();
break;
case R.id.nav_logout:
((FirebaseApplication) getApplication()).signOutUser(this);
break;
default:
fragmentClass = HomeFragment.class;
}
try {
fragment = (Fragment) fragmentClass.newInstance();
} catch (Exception e) {
Log.e(TAG, "Failed to obtain the fragment");
}
if (fragment != null && fragmentClass != null) {
fragmentManager.beginTransaction().replace(R.id.content_main, fragment).commit();
}
例如,在ChatDetailActivity我需要去ChatFragment
@Override
public void onBackPressed() {
// here I would need to return to the current fragment
}
感謝您的任何意見
分享一些代碼 –