我已经创建了一个家庭活动,其中包括一个导航抽屉onclick与片段。我已经包含fragmentTransaction.addToBackStack(null).commit();
与片段事务代码。但它不会回到上一页,而是关闭应用程序。Android片段addToBackStack不能使用导航抽屉
在我MainActivity
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
// Handle navigation view item clicks here.
int id = item.getItemId();
RelativeLayout mainLayout=(RelativeLayout)findViewById(R.id.mainlayout);
if (id == R.id.nav_project) {
ProjectFragment fragment = new ProjectFragment();
mainLayout.removeAllViews();
fragmentTransaction.replace(R.id.mainlayout, fragment);
fragmentTransaction.addToBackStack(null).commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
我的默认Fragment
public class ProjectFragment extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_project, container, false);
return v;
}
}
谁能帮我找出这个问题。
你是什么意思“但它没有反应。”?当您点击后退键时,应用程序是否会退出到首页? –
它不会回到上一页,而是关闭应用程序。 –
感谢Rubin为您的文本修改。也许你会得到更多的关注,你有我的,嘿嘿。 –