[英]Navigating inside a floating action button
我添加了主要活動。 我有一個 FAB 按鈕,我試圖通過單擊按鈕導航到其中一個片段。 但是我收到java.lang.IllegalArgumentException: navigation destination XXXXX/galleryFragment is unknown to this NavController不確定異常的原因是什么。 我是安卓開發新手,請原諒我的無知
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = findViewById(R.id.drawer_layout);
NavigationView navigationView = findViewById(R.id.nav_view);
// Passing each menu ID as a set of Ids because each
// menu should be considered as top level destinations.
mAppBarConfiguration = new AppBarConfiguration.Builder(
R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow)
.setDrawerLayout(drawer)
.build();
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
NavigationUI.setupWithNavController(navigationView, navController);
FloatingActionButton fab = findViewById(R.id.fab);
Navigation.setViewNavController(fab, navController);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Navigation.findNavController(view).navigate(R.id.galleryFragment);
}
});
}
Navigation.findNavController(view)
僅在視圖位於NavHostFragment
內NavHostFragment
(即,它是由您的片段之一創建的視圖)。
如果您的FloatingActionButton
位於NavHostFragment
之外(例如在您的活動布局中),那么您需要使用您在onCreate()
使用的相同內容: Navigation.findNavController(this, R.id.nav_host_fragment)
:
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Navigation.findNavController(this, R.id.nav_host_fragment).navigate(R.id.galleryFragment);
}
});
您可以將navController
存儲為全局變量,然后不要使用Navigation.findNavController
,使用navController.navigate
。
NavController navController = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
...
navController = Navigation.findNavController(this, R.id.nav_host_fragment);
NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
NavigationUI.setupWithNavController(navigationView, navController);
FloatingActionButton fab = findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
navController.navigate(R.id.galleryFragment);
}
});
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.