问题描述
您好，我只有一个活动和两个导航图。第一个图包含三个片段LoginFragment，RegisterFragment和HomeFragment。在我的第二张图中，有3个三个片段，分别是Fragment1，Fragment2和Fragment3。我在HomeFragment中实现了FragmentContainerView和底部导航，以便通过按底部导航图标替换该容器上的Second Graph Fragments。但是我不知道该怎么做..我尝试了很多事情，但是没有成功，因为我编程不好。我在下面粘贴了我的代码，请检查一下。谢谢
第一个FragmentContainerView
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Activities.StartActivity">
<androidx.fragment.app.FragmentContainerView
android:id="@+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:navGraph="@navigation/nav_graph" />
第二个FragmentContainerView
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Fragments.HomeFragment">
<androidx.fragment.app.FragmentContainerView
android:id="@+id/second_nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@+id/bottomnavigation"
app:defaultNavHost="true"
app:navGraph="@navigation/second_nav_graph" />
<com.etebarian.meowbottomnavigation.MeowBottomNavigation
android:id="@+id/bottomnavigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
app:mbn_backgroundBottomColor="@color/purple_500"
app:mbn_circleColor="@color/purple_700"
app:mbn_countBackgroundColor="#ff6f00"
app:mbn_countTextColor="@color/purple_700"
app:mbn_defaultIconColor="@android:color/white"
app:mbn_rippleColor="@color/lime_A700"
app:mbn_selectedIconColor="@color/lime_A700"
app:mbn_shadowColor="#1f212121" />
</RelativeLayout>
第一个导航图
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/nav_host"
app:startDestination="@id/loginFragment">
<include app:graph="@navigation/second_nav_graph" />
<fragment
android:id="@+id/loginFragment"
android:name="com.eclairios.socialconnectivity.Fragments.LoginFragment"
android:label="fragment_login"
tools:layout="@layout/fragment_login" >
<action
android:id="@+id/action_loginFragment_to_registerFragment"
app:destination="@id/registerFragment"
app:enteranim="@anim/slide_in_right"
app:exitAnim="@anim/slide_out_left"
app:popEnteranim="@anim/slide_in_left"
app:popExitAnim="@anim/slide_out_right" />
<action
android:id="@+id/action_loginFragment_to_homeFragment"
app:destination="@id/homeFragment" />
</fragment>
<fragment
android:id="@+id/registerFragment"
android:name="com.eclairios.socialconnectivity.Fragments.RegisterFragment"
android:label="fragment_register"
tools:layout="@layout/fragment_register" >
<action
android:id="@+id/action_registerFragment_to_homeFragment"
app:destination="@id/homeFragment" />
</fragment>
<fragment
android:id="@+id/homeFragment"
android:name="com.eclairios.socialconnectivity.Fragments.HomeFragment"
android:label="fragment_home"
tools:layout="@layout/fragment_home" >
<action
android:id="@+id/action_homeFragment_to_second_nav_graph2"
app:destination="@id/second_nav_graph" />
<action
android:id="@+id/action_homeFragment_to_second_nav_graph3"
app:destination="@id/second_nav_graph" />
</fragment>
</navigation>
第二个导航图
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/second_nav_graph"
app:startDestination="@id/firstFragment">
<fragment
android:id="@+id/firstFragment"
android:name="com.eclairios.socialconnectivity.Fragments.FirstFragment"
android:label="fragment_first"
tools:layout="@layout/fragment_first" >
<action
android:id="@+id/action_firstFragment_to_secondFragment"
app:destination="@id/secondFragment" />
<action
android:id="@+id/action_firstFragment_to_thirdFragment"
app:destination="@id/thirdFragment" />
</fragment>
<fragment
android:id="@+id/secondFragment"
android:name="com.eclairios.socialconnectivity.Fragments.SecondFragment"
android:label="fragment_second"
tools:layout="@layout/fragment_second" >
<action
android:id="@+id/action_secondFragment_to_thirdFragment"
app:destination="@id/thirdFragment" />
<action
android:id="@+id/action_secondFragment_to_firstFragment"
app:destination="@id/firstFragment" />
<action
android:id="@+id/action_secondFragment_to_thirdFragment2"
app:destination="@id/thirdFragment" />
</fragment>
<fragment
android:id="@+id/thirdFragment"
android:name="com.eclairios.socialconnectivity.Fragments.ThirdFragment"
android:label="fragment_third"
tools:layout="@layout/fragment_third" >
<action
android:id="@+id/action_thirdFragment_to_firstFragment"
app:destination="@id/firstFragment" />
<action
android:id="@+id/action_thirdFragment_to_secondFragment"
app:destination="@id/secondFragment" />
</fragment>
</navigation>
这是包含第二个FragmentContainerView和底部导航的片段
public class HomeFragment extends Fragment {
private static final int TAB_ID = 1;
private MeowBottomNavigation bottomNavigation;
Fragment nestednavHostFragment;
@Override
public View onCreateView(LayoutInflater inflater,ViewGroup viewGroup,Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_home,viewGroup,false);
}
@Override
public void onViewCreated(@NonNull View view,@Nullable Bundle savedInstanceState) {
super.onViewCreated(view,savedInstanceState);
init(view);
listner_SignUp(view);
}
private void init(View view) {
bottomNavigation = view.findViewById(R.id.bottomnavigation);
bottomNavigation.show(TAB_ID,false);
bottomNavigation.add(new MeowBottomNavigation.Model(1,R.drawable.ic_invisible));
bottomNavigation.add(new MeowBottomNavigation.Model(2,R.drawable.ic_visibility));
bottomNavigation.add(new MeowBottomNavigation.Model(3,R.drawable.email));
}
private void listner_SignUp(View view){
bottomNavigation.setonClickMenuListener(new MeowBottomNavigation.ClickListener() {
@Override
public void onClickItem(MeowBottomNavigation.Model item) {
// your codes
if (item.getId()==1) {
Navigation.findNavController(view).navigate(R.id.firstFragment);
}else if (item.getId()==2){
Navigation.findNavController(view).navigate(R.id.secondFragment);
}else if (item.getId()==3){
Navigation.findNavController(view).navigate(R.id.thirdFragment);
}
}
});
bottomNavigation.setonShowListener(new MeowBottomNavigation.ShowListener() {
@Override
public void onShowItem(MeowBottomNavigation.Model item) {
// your codes
if (item.getId()==1) {
Navigation.findNavController(view).navigate(R.id.firstFragment);
}else if (item.getId()==2){
Navigation.findNavController(view).navigate(R.id.secondFragment);
}else if (item.getId()==3){
Navigation.findNavController(view).navigate(R.id.thirdFragment);
}
Log.e("djfndjkfnv","onClickItem: showlistner "+item.getCount()+"==========="+item.getId() );
}
});
bottomNavigation.setonReselectListener(new MeowBottomNavigation.ReselectListener() {
@Override
public void onReselectItem(MeowBottomNavigation.Model item) {
// your codes
Log.e("djfndjkfnv","onClickItem: reselected "+item.getCount()+"==========="+item.getId() );
}
});
}
}
登录片段
public class LoginFragment extends Fragment {
private TextView sign_up_login;
private MaterialButton btn_login;
@Override
public View onCreateView(LayoutInflater inflater,Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_login,false);
}
@Override
public void onViewCreated(@NonNull View view,@Nullable Bundle savedInstanceState) {
super.onViewCreated(view,savedInstanceState);
init(view);
listner_SignUp();
}
private void init(View view) {
sign_up_login = view.findViewById(R.id.sign_up_login);
btn_login = view.findViewById(R.id.btn_login);
}
private void listner_SignUp(){
sign_up_login.setonClickListener(v -> {
findNavController(LoginFragment.this).navigate(R.id.registerFragment);
});
btn_login.setonClickListener(v -> {
findNavController(LoginFragment.this).navigate(R.id.homeFragment);
});
}
I got that error
**Navigation action/destination com.eclairios.socialconnectivity:id/firstFragment cannot be found from the current destination Destination(com.eclairios.socialconnectivity:id/homeFragment) label=fragment_home class=com.eclairios.socialconnectivity.Fragments.HomeFragment**
解决方法
暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！
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