我有MainActivity的Android片段生命週期和FragmentManager.add()
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getSupportFragmentManager()
.beginTransaction()
.add(R.id.fragment_container, AFragment.newInstance(75))
.commit();
}
@Override
public void onBackPressed() {
if (getSupportFragmentManager().getBackStackEntryCount() > 0) {
getSupportFragmentManager().popBackStack();
} else {
super.onBackPressed();
}
}
另外,我有AFragment
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_a, container, false);
view.findViewById(R.id.show_b_btn).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
AppCompatActivity appCompatActivity = (AppCompatActivity) getActivity();
appCompatActivity.getSupportFragmentManager()
.beginTransaction()
.add(R.id.fragment_container, BFragment.newInstance())
.addToBackStack("B")
.commit();
}
});
return view;
}
BFragment只是一個空片段。
而且我有以下片段生命週期的輸出:
Open the App:
A - onCreateView
A - onStart
A - onResume
Click R.id.show_b_btn on AFragment:
B - onStart
B - onResume
Click back button:
B - onPause
B - onStop
Close the App:
A - onPause
A - onStop
所以,問題是爲什麼AFragment不調用的onPause當我點擊ShowBFragment爲什麼AFragment不調用的onResume當我點擊後退按鈕?
我認爲這是因爲我使用.add()和BFragment只覆蓋了AFragment,所以當片段可見時,AFragment也「生活」,對嗎?
是的,你是對的。因爲你使用.add()和BFragment只是覆蓋了AFragment,所以AFragment在「BFragment」可見時也「活着」。 –
很酷,謝謝 –