[英]Certain tablayout fragment is missing when changing navigationbar menu
因此,我将 BottomNavbar 与 Tablayout 结合起来,起初它工作正常,但是当我从home
更改底部导航栏的菜单然后再次返回menu
时,其中一个 tablayout 片段消失了,如下所示:
正如您在图像中看到的,起初它工作得很好,但是当我回到家然后再次回到菜单时,tab minuman
的fragment
消失了
这是我的代码:
布局
片段菜单.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".MenuFragment">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:id="@+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.tabs.TabLayout
android:id="@+id/tabLayoutView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/pal1c3"
app:tabTextColor="@color/white"
app:tabIndicatorColor="@color/black"/>
</com.google.android.material.appbar.AppBarLayout>
<androidx.viewpager.widget.ViewPager
android:id="@+id/containerViewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:layout_editor_absoluteX="8dp"
android:layout_below="@+id/appBarLayout"/>
</RelativeLayout>
</FrameLayout>
fragment_makanan_menu.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ViewMenuHome.MakananMenuFragment">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/black"
android:layout_gravity="center"
android:gravity="center"
android:textSize="30sp"
android:text="Hello text"/>
</FrameLayout>
fragment_jajanan_menu.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ViewMenuHome.JajananMenuFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:textColor="@color/black"
android:textSize="30sp"
android:text="Jajanan Menu Fragment" />
</FrameLayout>
fragment_minuman_menu.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ViewMenuHome.MinumanMenuFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:textColor="@color/black"
android:textSize="30sp"
android:text="@string/hello_blank_fragment" />
</FrameLayout>
Java
MenuFragment.java
package com.example.pesanpalgading20;
import android.content.Context;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import androidx.viewpager.widget.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.google.android.material.tabs.TabLayout;
/**
* A simple {@link Fragment} subclass.
* Use the {@link MenuFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class MenuFragment extends Fragment {
TabLayout tabLayout;
ViewPager viewPager;
Context context;
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public MenuFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment MenuFragment.
*/
// TODO: Rename and change types and number of parameters
public static MenuFragment newInstance(String param1, String param2) {
MenuFragment fragment = new MenuFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View viewRoot = inflater.inflate(R.layout.fragment_menu, container, false);
tabLayout = (TabLayout)viewRoot.findViewById(R.id.tabLayoutView);
viewPager = (ViewPager)viewRoot.findViewById(R.id.containerViewPager);
context = container.getContext();
tabLayout.addTab(tabLayout.newTab().setText("Makanan"));
tabLayout.addTab(tabLayout.newTab().setText("Minuman"));
tabLayout.addTab(tabLayout.newTab().setText("Jajanan"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
final MyAdapter adapter = new MyAdapter(getActivity(),getFragmentManager(),tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
// Inflate the layout for this fragment
return viewRoot;
}
}
MyAdapter.java
package com.example.pesanpalgading20;
import android.content.Context;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
import com.example.pesanpalgading20.ViewMenuHome.JajananMenuFragment;
import com.example.pesanpalgading20.ViewMenuHome.MakananMenuFragment;
import com.example.pesanpalgading20.ViewMenuHome.MinumanMenuFragment;
public class MyAdapter extends FragmentPagerAdapter {
private Context myContext;
int totalTabs;
public MyAdapter (Context context, FragmentManager fm, int totalTabs){
super(fm);
myContext = context;
this.totalTabs = totalTabs;
}
//fragment per tabs
@Override
public Fragment getItem(int position){
switch(position){
case 0:
MakananMenuFragment makananMenuFragment = new MakananMenuFragment();
return makananMenuFragment;
case 1:
MinumanMenuFragment minumanMenuFragment = new MinumanMenuFragment();
return minumanMenuFragment;
case 2:
JajananMenuFragment jajananMenuFragment = new JajananMenuFragment();
return jajananMenuFragment;
default: return null;
}
}
//counts total number of tabs
@Override
public int getCount() {
return totalTabs;
}
}
MakananMenuFragment.java
package com.example.pesanpalgading20.ViewMenuHome;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ExpandableListView;
import com.example.pesanpalgading20.R;
import com.example.pesanpalgading20.ToppingAdapter.ToppingAdapter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
/**
* A simple {@link Fragment} subclass.
* Use the {@link MakananMenuFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class MakananMenuFragment extends Fragment {
ExpandableListView expandableListTopping;
List<String> listGroup;
HashMap<String,List<String>> listItem;
ToppingAdapter toppingAdapter;
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public MakananMenuFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment MakananMenuFragment.
*/
// TODO: Rename and change types and number of parameters
public static MakananMenuFragment newInstance(String param1, String param2) {
MakananMenuFragment fragment = new MakananMenuFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
public MakananMenuFragment(String mParam1) {
this.mParam1 = mParam1;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View viewRoot = inflater.inflate(R.layout.fragment_makanan_menu, container, false);
// Inflate the layout for this fragment
return viewRoot;
}
}
JajananMenuFragment.java
package com.example.pesanpalgading20.ViewMenuHome;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.example.pesanpalgading20.R;
/**
* A simple {@link Fragment} subclass.
* Use the {@link JajananMenuFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class JajananMenuFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
public JajananMenuFragment(String mParam1) {
this.mParam1 = mParam1;
}
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public JajananMenuFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment JajananMenuFragment.
*/
// TODO: Rename and change types and number of parameters
public static JajananMenuFragment newInstance(String param1, String param2) {
JajananMenuFragment fragment = new JajananMenuFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_jajanan_menu, container, false);
}
}
MinumanMenuFragment
package com.example.pesanpalgading20.ViewMenuHome;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.example.pesanpalgading20.R;
/**
* A simple {@link Fragment} subclass.
* Use the {@link MinumanMenuFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class MinumanMenuFragment extends Fragment {
public MinumanMenuFragment(String mParam1) {
this.mParam1 = mParam1;
}
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public MinumanMenuFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment MinumanMenu.
*/
// TODO: Rename and change types and number of parameters
public static MinumanMenuFragment newInstance(String param1, String param2) {
MinumanMenuFragment fragment = new MinumanMenuFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_minuman_menu, container, false);
}
}
原来问题是我的MenuFragment.java中的getFragmentmanager()
当我改为getChildFragmentManager()
时就没有问题了
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