当我多次单击底部导航项目时，片段再次加载
当我多次单击底部导航项目时，片段再次加载
提问于 2018-05-28 14:04:43
这是我的代码，我已经创建了一个底部导航视图，我连接的项目分别碎片。当我再次单击导航项目时，片段再次加载。
我不知道这里有什么问题。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
BottomNavigationView bottomNav = findViewById(R.id.bottom_navigation);
bottomNav.setOnNavigationItemSelectedListener(navListener);
}
private BottomNavigationView.OnNavigationItemSelectedListener navListener =
new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
Fragment SelectedFragment=null;
FragmentManager fm=getSupportFragmentManager();
FragmentTransaction ft=fm.beginTransaction();
ft.commit();
switch (item.getItemId()) {
case R.id.navigation_home:
setTitle("Playing11");
HomeFragment fragment = new HomeFragment();
ft.replace(R.id.fragment_container, fragment);
return true;
case R.id.navigation_dashboard:
HomeFragment1 fragment1 = new HomeFragment1();
ft.replace(R.id.fragment_container, fragment1);
return true;
case R.id.navigation_notifications:
setTitle("Safe11");
HomeFragment2 fragment2 = new HomeFragment2();
ft.replace(R.id.fragment_container, fragment2);
return true;
case R.id.navigation_notification:
setTitle("More");
HomeFragment3 fragment3 = new HomeFragment3();
ft.replace(R.id.fragment_container, fragment3);
return true;
}
return false;
}
};
}回答 2
Stack Overflow用户
发布于 2018-05-29 19:34:34
尝试像这样更改代码：
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
switch (item.getItemId()) {
case R.id.menu_home:
HomeFragment homeFragment = new HomeFragment();
fragmentTransaction.replace(R.id.frameContentPlace, homeFragment, "HomeFragment").addToBackStack("HomeFragment");
break;
case R.id.menu_profile:
HomeFragment1 fragment1 = new HomeFragment1();
fragmentTransaction.replace(R.id.frameContentPlace, fragment1).addToBackStack("HomeFragment1");
break;
case R.id.menu_bookings:
HomeFragment2 fragment2 = new HomeFragment2();
fragmentTransaction.replace(R.id.frameContentPlace, fragment2).addToBackStack("HomeFragment2");
break;
}
fragmentTransaction.commit();
return true;
}Stack Overflow用户
发布于 2018-05-28 15:05:15
当你添加片段时，使用标签。所以写吧
ft.replace(R.id.fragment_container, fragment, "MyFragment);而不是
ft.replace(R.id.fragment_container, fragment);并检查此片段是否可见，因为不会再次加载此片段
switch (item.getItemId())
{
case R.id.navigation_home:
HomeFragment fragment = (HomeFragment)getFragmentManager().findFragmentByTag("MyFragment");
if (fragment != null && !fragment.isVisible())
{
setTitle("Playing11");
HomeFragment fragment = new HomeFragment();
ft.replace(R.id.fragment_container, fragment);
return true;
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50560044
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