我有一个 Activity
,代码如下:
public class AuthenticatedMainActivity extends Activity implements FragmentManager.OnBackStackChangedListener{
@Override
protected void onCreate(Bundle savedInstanceState) {
.............
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().add(R.id.frame_container,fragment, "First").addToBackStack(null).commit();
}
private void switchFragment(Fragment fragment){
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment).addToBackStack("Tag").commit();
}
@Override
public void onBackStackChanged() {
System.out.println("====================================================changeeeeeeeeeeeeeeeeeeeeeeeeee");
}
}
但即使使用switchFragment
方法成功替换了片段,onBackStackChanged()
方法也不会被调用。