參考:https://blog.csdn.net/harvic880925/article/details/44917955
https://stackoverflow.com/questions/16036572/how-to-pass-values-between-fragments
https://blog.csdn.net/harvic880925/article/details/44131865
public static Fragment2 newInstance(String text) {
Fragment2 fragment = new Fragment2();
Bundle args = new Bundle();
args.putString("param", text);
fragment.setArguments(args);
return fragment;
String strtext=getArguments().getString("message");
commit 是一次提交為單位的 所以如果你add A + add BC pop也會是 pop BC + pop A
每添加一次就要用addToBackStack
manager.popBackStack("fragment2",0);//通過TAG回推 0是在當前頁面
manager.popBackStack("fragment2",FragmentManager.POP_BACK_STACK_INCLUSIVE);
用FragmentManager+ fragmentTransaction共同管理~~~
//還原到第一頁
1.先在gradle加這段 implementation 'com.google.android.material:material:1.0.0-rc01'
2.創建你的fragment new>add>fragment
MumiRabbit
public class HomeFragment extends Fragment {
private TextView mTextTitle;
public HomeFragment() {
// Requires empty public constructor
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_home, container, false);
//ur layout ,container,false>不會自動創建layout (boolean atatch root) true的話會除了fragment外的都刪掉
mTextTitle = (TextView) root.findViewById(R.id.text_title_home);
return root;
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mTextTitle.setText("Fire in the home(x) hole(o)!");
mTextTitle.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
((MainActivity) getActivity()).onOpenDetail("Open from Dashboard!");
//接資料
}
});
}
}
mainactivity.java
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mFragmentManager = getFragmentManager();
//管理fragment
((BottomNavigationView) findViewById(R.id.navigation)).setOnNavigationItemSelectedListener(this);
((BottomNavigationView) findViewById(R.id.navigation)).setSelectedItemId(R.id.navigation_home);
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
//可以用來add(在線頂最上層) remove replace(全部拿出來再放入)
//add 跟 replace 會對沖 不能同時用
if (mFragmentManager.findFragmentByTag(DETAIL) != null) {
mFragmentManager.popBackStack();//從線頂拿出來
}
switch (item.getItemId()) {
case R.id.navigation_home:
if (mHomeFragment == null) mHomeFragment = new HomeFragment();
if (mDashboardFragment != null) fragmentTransaction.hide(mDashboardFragment);
// if (mNotificationsFragment != null) fragmentTransaction.hide(mNotificationsFragment);
if (mHomeFragment.isAdded()) {
fragmentTransaction.show(mHomeFragment);
} else {
fragmentTransaction.add(R.id.container_main, mHomeFragment, HOME);
/*add(int containerViewId, Fragment fragment, String tag);*/
}
fragmentTransaction.commit();//一次性繳交
return true;
case R.id.navigation_dashboard:
if (mDashboardFragment == null) mDashboardFragment = new DashboardFragment();
if (mHomeFragment != null) fragmentTransaction.hide(mHomeFragment);
// if (mNotificationsFragment != null) fragmentTransaction.hide(mNotificationsFragment);
if (mDashboardFragment.isAdded()) {
fragmentTransaction.show(mDashboardFragment);
} else {
fragmentTransaction.add(R.id.container_main, mDashboardFragment, DASHBOARD);
}
fragmentTransaction.commit();
return true;
case R.id.navigation_notifications:
// if (mNotificationsFragment == null) mNotificationsFragment = new NotificationFragment();
// if (mHomeFragment != null) fragmentTransaction.hide(mHomeFragment);
// if (mDashboardFragment != null) fragmentTransaction.hide(mDashboardFragment);
// if (mNotificationsFragment.isAdded()) {
// fragmentTransaction.show(mNotificationsFragment);
// } else {
// fragmentTransaction.add(R.id.container_main, mNotificationsFragment, NOTIFICATIONS);
// }
// fragmentTransaction.commit();
//
// return true;
}
return false;
}
public void onOpenDetail(String message) {
FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
// 如果目前顯示的頁面是 home fragment
if (mHomeFragment != null && !mHomeFragment.isHidden()) {
fragmentTransaction.hide(mHomeFragment);
fragmentTransaction.addToBackStack(HOME);
//transaction.addToBackStack(String tag);
}
if (mDashboardFragment != null && !mDashboardFragment.isHidden()) {
fragmentTransaction.hide(mDashboardFragment).addToBackStack(DASHBOARD);
}
// if (mNotificationsFragment != null && !mNotificationsFragment.isHidden()) {
// fragmentTransaction.hide(mNotificationsFragment).addToBackStack(NOTIFICATIONS);
// }
DetailFragment fragment = new DetailFragment();
Bundle bundle = new Bundle();
bundle.putString(DETAIL_MESSAGE, message);
fragment.setArguments(bundle);
fragmentTransaction.add(R.id.container_main, fragment, DETAIL).commit();
}
//main.xml
<androidx.constraintlayout.widget.ConstraintLayout 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=".MainActivity">
<FrameLayout
android:id="@+id/container_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="50dp" >
</FrameLayout>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/navigation"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="0dp"
android:layout_marginStart="0dp"
android:background="?android:attr/windowBackground"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="@menu/navigation" />
</androidx.constraintlayout.widget.ConstraintLayout>
menu資料夾內
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/navigation_home"
android:icon="@drawable/ic_home_black_24dp"
android:title="title_home" />
<item
android:id="@+id/navigation_dashboard"
android:icon="@drawable/ic_dashboard_black_24dp"
android:title="title_dashboard" />
<item
android:id="@+id/navigation_notifications"
android:icon="@drawable/ic_notifications_black_24dp"
android:title="title_notifications" />
</menu>
**第二種**
用tablayout + viewpager
main.xml
<androidx.coordinatorlayout.widget.CoordinatorLayout 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=".Two"
>
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#f00"
android:layout_gravity="bottom">
<com.google.android.material.tabs.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:id="@+id/tabs">
<com.google.android.material.tabs.TabItem
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="red">
</com.google.android.material.tabs.TabItem>
<com.google.android.material.tabs.TabItem
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="green">
</com.google.android.material.tabs.TabItem>
<com.google.android.material.tabs.TabItem
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="blue">
</com.google.android.material.tabs.TabItem>
</com.google.android.material.tabs.TabLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.viewpager.widget.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/viewpager">
</androidx.viewpager.widget.ViewPager>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
mainactivity.java
public class Two extends AppCompatActivity {
public PreferencesHelperImp preferencesHelperImp;
TabLayout tabLayout;
ViewPager viewPager;
PageAdapter pageAdapter;
Toolbar toolbar,toolbartab;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_two);
// TextView textView=(TextView) findViewById(R.id.text);
// SharedPreferences sharedPreferences = getApplicationContext().getSharedPreferences("sharedPreferences", MODE_PRIVATE);
// String email=sharedPreferences.getString("data","");
// TextView textView = (TextView)findViewById(R.id.email);
// textView.setText(email);
preferencesHelperImp = new PreferencesHelperImp(getApplicationContext());
String email = preferencesHelperImp.getStringData();
Log.d("Mainactivity", "onClick: " + email);
tabLayout=(TabLayout)findViewById(R.id.tabs);
viewPager=(ViewPager)findViewById(R.id.viewpager);
// toolbar=(Toolbar)findViewById(R.id.toolbar);
// toolbartab=(Toolbar)findViewById(R.id.toolbartab);
//setSupportActionBar(toolbar);
pageAdapter=new PageAdapter(getSupportFragmentManager());
pageAdapter.addFragment(new RedFragment(),"Red");
pageAdapter.addFragment(new GreenFragment(),"Green");
pageAdapter.addFragment(new BlueFragment(),"Blue");
viewPager.setAdapter(pageAdapter);
viewPager.setPageTransformer(true,new DepthPageTransformer());
//轉場方式
tabLayout.setupWithViewPager(viewPager);
tabLayout.addOnTabSelectedListener(new TabLayout.BaseOnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
switch (tab.getPosition()){
case 0:
getWindow().setStatusBarColor(RED);
tabLayout.setBackgroundColor(RED);
break;
case 1:
getWindow().setStatusBarColor(GREEN);
tabLayout.setBackgroundColor(GREEN);
break;
case 2:
getWindow().setStatusBarColor(BLUE);
tabLayout.setBackgroundColor(BLUE);
tabLayout.setTabTextColors(ColorStateList.valueOf(WHITE));
break;
}
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
return super.onCreateOptionsMenu(menu);
}
}
//pageadapter
public class PageAdapter extends FragmentPagerAdapter {
ArrayList<Fragment> fragmentArrayList;
ArrayList<String> fragmentTitle;
PageAdapter(FragmentManager fmng){
super(fmng);;
fragmentArrayList=new ArrayList<>();
fragmentTitle=new ArrayList<>();
}
@NonNull
@Override
public Fragment getItem(int position) {
return fragmentArrayList.get(position);
}
@Override
public int getCount() {
return fragmentArrayList.size();
}
public void addFragment(Fragment fragment,String title){
fragmentArrayList.add(fragment);
fragmentTitle.add(title);
}
//----------androidx whilte tabs text not in 9+
@Nullable
@Override
public CharSequence getPageTitle(int position) {
return fragmentTitle.get(position);
}
}
redfragment
public class RedFragment 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";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
public RedFragment() {
// 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 RedFragment.
*/
// TODO: Rename and change types and number of parameters
public static RedFragment newInstance(String param1, String param2) {
RedFragment fragment = new RedFragment();
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
View r=inflater.inflate(R.layout.fragment_red2, container, false);
setHasOptionsMenu(true);
return r ;
}
@Override
public void onCreateOptionsMenu(@NonNull Menu menu, @NonNull MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
inflater.inflate(R.menu.menu_red,menu);
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
// @Override
// public void onAttach(Context context) {
// super.onAttach(context);
// if (context instanceof OnFragmentInteractionListener) {
// mListener = (OnFragmentInteractionListener) context;
// } else {
// throw new RuntimeException(context.toString()
// + " must implement OnFragmentInteractionListener");
// }
// }
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
}
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