I wanna inflate some fragment from an activity (which is not main but is activity).
I do exactly like this instruction:
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction =
fragmentManager.beginTransaction();
YourFragment fragment = new YourFragment();
fragmentTransaction.replace(android.R.id.content, fragment);//here is the error
fragmentTransaction.commit();
but in the one before last line, editor shows error saying:
2nd argument wrong type.Found:max.mzf.max.fragment.Required:android.app.fragment
this is my own code:
Activity
public class QuizCard extends FragmentActivity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.quiz_card);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
QcardFragment fragment = new QcardFragment();
fragmentTransaction.replace(R.id.your_placeholder, fragment );
fragmentTransaction.commit();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.card_menu, menu);
return true;
}
and this is QcardFragment:
public class QcardFragment extends Fragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//get data from Argument
}
public void onCardClick(View view) {
flipCard();
}
private void flipCard() {
View rootLayout = (View) getActivity().findViewById(R.id.main_activity_root);
View cardFace = (View) getActivity().findViewById(R.id.main_activity_card_face);
View cardBack = (View) getActivity().findViewById(R.id.main_activity_card_back);
FlipAnimation flipAnimation = new FlipAnimation(cardFace, cardBack);
if (cardFace.getVisibility() == View.GONE) {
flipAnimation.reverse();
}
rootLayout.startAnimation(flipAnimation);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.qcardfragment, container, false);
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
}
What's wrong?
Make sure that your fragment class extends Fragment from android native library. If you are using external implementation try to change
FragmentManager fragmentManager = getFragmentManager();
to
FragmentManager fragmentManager = getSupportFragmentManager();
Related
I have two fragment inside a LinearLayout.
When I click on a FAB button I would like to hide one but a
null object reference appears on FragmentTransaction hide method.
Why doesn't "f" have a view reference?
public class FragmentOne extends Fragment {
public FragmentOne() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View returnView = inflater.inflate(R.layout.fragment_one, container, false);
FloatingActionButton fabTemp = returnView.findViewById(R.id.fabTemp);
final Fragment f = getActivity().getSupportFragmentManager().getFragments().get(0).getChildFragmentManager().getFragments().get(1);
final FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
fabTemp.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
transaction.setCustomAnimations(android.R.animator.fade_in,
android.R.animator.fade_out);
if (f.isHidden()) {
transaction.show(f);
} else {
transaction.hide(f);
}
transaction.commit();
}
});
return returnView;
}
I solved in another way despite not being as i wanted
final View frag = getView().findViewById(R.id.frgSettemp);
frag.setVisibility(View.GONE);
In onCreateView just inflate and return the view.
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View returnView = inflater.inflate(R.layout.fragment_one, container, false);
return returnView;
}
Try the other processing in onViewCreated #override method. like this
#Override
public void onViewCreated(View v, Bundle savedInstanceState) {
super.onViewCreated(v, savedInstanceState);
FloatingActionButton fabTemp = getView().findViewById(R.id.fabTemp);
final Fragment f = getActivity().getSupportFragmentManager().getFragments().get(0);
final FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
fabTemp.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
transaction.setCustomAnimations(android.R.animator.fade_in,
android.R.animator.fade_out);
if (f.isHidden()) {
transaction.show(f);
} else {
transaction.hide(f);
}
transaction.commit();
}
});
}
Hope this will help.
You should call only
final Fragment f = getActivity().getSupportFragmentManager().getFragments().get(0);
or
final Fragment f = getActivity().getSupportFragmentManager().getFragments().get(1);
What you have done will return null for sure.
I have three fragment and one activity. It works this way:
[activity]-> [MainFragment]->[MenuFragment]->[SignUpFragment]
When [SignUpFragment] is back pressed, the [MainFragment] is created twice.
I tried setRetaInInstance(true) and I checked savedInstanceState but I can not prevent [MainFragment] recreating.
This is my MainActivity:
public class MainActivity extends AppCompatActivity {
public Bundle mSavedInstanceState;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mSavedInstanceState = savedInstanceState;
setContentView(R.layout.activity_main);
}
#Override
protected void onResume() {
super.onResume();
callMainFragment();
}
private void callMainFragment() {
if (mSavedInstanceState == null) {
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.container_category, new MainFragment(), MainFragment.class.getSimpleName());
transaction.addToBackStack(null);
transaction.commit();
}
}
public ActionBar getMainActionBar(){
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
// Action Bar Display settings
actionBar.setDisplayShowCustomEnabled(true);
actionBar.setDisplayShowTitleEnabled(false);
// Custom view inflater
LayoutInflater inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
// Custom layout view
View viewActionBar = inflater.inflate(R.layout.action_bar, null);
// Set custom view
actionBar.setCustomView(viewActionBar);
actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
}
return actionBar;
}
This is my MainFragment:
public class MainFragment extends BaseFragment implements AdapterView.OnItemClickListener, BuyersGuideCategoriesDelegate, View.OnClickListener {
private Bundle mSavedInstanceState;
private BuyersGuideCategoriesFragment mCategoriesFragment;
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setRetainInstance(true);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
mSavedInstanceState = savedInstanceState;
if (mSavedInstanceState == null) {
mView = inflater.inflate(R.layout.fragment_main, container, false);
// Call Grid View Buyers Guide Fragment
mCategoriesFragment = new BuyersGuideCategoriesFragment();
mCategoriesFragment.mGridViewDelegate = this;
setIcons();
setTitles();
setTexts();
initListView();
}
return mView;
}
#Override
public void onResume() {
super.onResume();
ImageView menu = (ImageView) ((MainActivity) getActivity()).getMainActionBar().getCustomView().findViewById(R.id.action_bar_menu_icon);
menu.setOnClickListener(this);
}
#Override
public void onClick(View v) {
if (mSavedInstanceState == null) {
MainActivity activity = (MainActivity) getActivity();
FragmentManager manager = activity.getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.container_category, new MenuFragment(),MenuFragment.class.getSimpleName());
transaction.addToBackStack(null);
transaction.commit();
}
}
}
This is my MenuFragment:
public class MenuFragment extends BaseFragment implements AdapterView.OnItemClickListener, View.OnClickListener {
private Bundle mSavedInstanceState;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
mSavedInstanceState = savedInstanceState;
if (savedInstanceState == null) {
mView = inflater.inflate(R.layout.fragment_menu, container, false);
setMenuItemsListViewAdapter();
}
return mView;
}
private void setMenuItemsListViewAdapter() {
ListView menuItems = (ListView) mView.findViewById(R.id.list_menu_items);
ListMenuItemsListViewAdapter adapter = new ListMenuItemsListViewAdapter(getContext(),getMenuItemNames());
menuItems.setAdapter(adapter);
menuItems.setOnItemClickListener(this);
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
switch ((String) parent.getAdapter().getItem(position)){
case SIGN_UP:
replaceFragment(R.id.container_category,new SignUpFragment(),SignUpFragment.class.getSimpleName());
break;
}
}
private void replaceFragment(int containerId,Fragment fragment, String fragmentTag){
if (mSavedInstanceState == null){
MainActivity activity = (MainActivity) getActivity();
FragmentManager manager = activity.getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(containerId,fragment,fragmentTag);
transaction.addToBackStack(null);
transaction.commit();
}
}
#Override
public void onClick(View v) {
switch (v.getId()){
case R.id.menu_back_icon:
replaceFragment(R.id.container_category, new MainFragment(),MainFragment.class.getSimpleName());
break;
}
}
}
And this is my SignUpFragment:
public class SignUpFragment extends BaseFragment implements View.OnClickListener{
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (savedInstanceState == null) {
mView = inflater.inflate(R.layout.fragment_sign_up, container, false);
}
return mView;
}
}
EDIT 1: The MainFragment is recreated only when I return from SignUpFragment to MenuFragment. I am doing wrong using so many fragments? Should I use activity?
When you are move between Fragments, call addToBackStack() :
FragmentTransaction ft = fragmentManager.beginTransation();
ft.replace( R.id.fragment, new MyFragment() ).addToBackStack( "ftransaction" ).commit();
Create first Fragment:
FragmentTransaction ft = fragmentManager.beginTransation();
ft.add(R.id.container, new FirstFragment()).addToBackStack(null).commit();
Second:
FragmentTransaction ft = fragmentManager.beginTransation();
ft.replace(R.id.container, new SecondFragment()).addToBackStack(null).commit();
and Third:
FragmentTransaction ft = fragmentManager.beginTransation();
ft.replace(R.id.container, new ThirdFragment()).commit();
In my MainActivity there is a FrameLayout (id=fragment_container) that is replaced by the Activity in onCreate with FragmentA. FragmentA just contains a single Button and calls onClick in the MainActivity in order to replace the FrameLayout with FragmentB. FragmentB contains a RecyclerView and is shown correctly. I call fragmentManager.popBackStack() to bring back FragmentA. Now FragmentA is shown on top of FragmentB (which I still can interact with).
Why is FragmentB not removed after calling popBackStack?
MainActivity
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private FragmentManager fragmentManager;
#Override
public void onBackPressed() {
fragmentManager.popBackStack();
}
#Override
public void onClick(View view) {
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, new FragmentB());
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//...
fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
FragmentA fragment = FragmentA.getInstance(this); //register OnClickListener
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();
}
//...
}
FragmentA
public class FragmentA extends Fragment {
private View.OnClickListener onClickListener;
public FragmentA() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_a, container, false);
FloatingActionButton fab = (FloatingActionButton) view.findViewById(R.id.fab);
fab.setOnClickListener(onClickListener);
return view;
}
public static FragmentA getInstance(View.OnClickListener onClickListener) {
FragmentA fragmentA = new FragmentA();
fragmentA.setOnClickListener(onClickListener);
return fragmentA;
}
private void setOnClickListener(View.OnClickListener onClickListener) {
this.onClickListener = onClickListener;
}
}
FragmentB
public class FragmentB extends Fragment {
//...
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.FragmentB, container, true);
//manipulating Views...
//...
return view;
}
}
The problem is in the FragmentB class. You should not pass the argument attachToRoot=true.
Try this instead:
public class FragmentB extends Fragment {
//...
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
//don't pass true
View view = inflater.inflate(R.layout.FragmentB, container, false);
//manipulating Views...
//...
return view;
}
}
Use popBackStackImmediate instead,
#Override
public void onBackPressed() {
fragmentManager.popBackStackImmediate();
}
From the popBackStackImmediate docs,
Like popBackStack(), but performs the operation immediately inside of the call. This is like calling executePendingTransactions() afterwards.
I am new to Fragments. I tried simple fragment example. But it throws the error. I don't know what is wrong.
public class NewActivity extends Activity {
int mStackLevel = 1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (savedInstanceState == null) {
Fragment newFragment = NewFragment
.newInstance(mStackLevel);
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.add(R.id.simple_fragment, newFragment).commit();
} else {
mStackLevel = savedInstanceState.getInt("level");
}
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("level", mStackLevel);
}
public static class NewFragment extends Fragment {
int mNum;
Context context;
static NewFragment newInstance(int num) {
NewFragment f = new NewFragment();
// Supply num input as an argument.
Bundle args = new Bundle();
args.putInt("num", num);
f.setArguments(args);
return f;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mNum = getArguments() != null ? getArguments().getInt("num") : 1;
context = getActivity();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.example_fragment, container,
false);
return v;
}
}
}
My logcat shows:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.FragmentExample/com.example.FragmentExample.NewActivity}: java.lang.IllegalArgumentException: No view found for id 0x7f07003c for fragment NewFragment{40ff0850 #0 id=0x7f07003c}
ft.add(R.id.simple_fragment, newFragment).commit();
you missed setContentView for your Activity. Your Fragment can not be added without a View hierarchy.
Note : Your Fragment is hosted by an activity. So you need to set the content to the activity first.
Just replace this method with your method
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(Your_layout_file);
if (savedInstanceState == null) {
Fragment newFragment = NewFragment
.newInstance(mStackLevel);
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.add(R.id.simple_fragment, newFragment).commit();
} else {
mStackLevel = savedInstanceState.getInt("level");
}
}
you missed this line setContentView(Your_layout_file);
This answer highlights a silly mistake that may occur, that arises when nesting fragments or you are converting activities to fragments.
If you are trying to replace a fragment within a fragment with the fragmentManager but you are not inflating the parent fragment that can cause an issue.
In BaseFragment.java OnCreateView:
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.replace(R.id.container, new DifferentFragment())
.commit();
}
return super.onCreateView(inflater, container, savedInstanceState);
Replace super.onCreateView(inflater, container, savedInstanceState);
with inflating the correct layout for the fragment:
return inflater.inflate(R.layout.base_fragment, container, false);
I have created just sample application for fragment hiding and showing.At the first fragment is added into the view properly.But on menu press to hide fragment it don't get hide.I posted my code as follows..
public class SwapfragActivity extends Activity
{
FrameLayout fr;
FragmentManager fm = getFragmentManager();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
fr = (FrameLayout) findViewById(R.id.fm1);
frag f = new frag();
}
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
menu.add("SHOW");
menu.add("HIDE");
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item)
{
frag f = new frag();
if (item.getTitle() == "SHOW")
{
if (!f.isAdded())
{
FragmentTransaction ft = fm.beginTransaction();
ft.add(R.id.fm1, f);
ft.commit();
}
else if (f.isHidden())
{
FragmentTransaction ft = fm.beginTransaction();
ft.show(f);
ft.commit();
}
}
else
{
if (f.isAdded())
{
FragmentTransaction ft = fm.beginTransaction();
ft.hide(f);
ft.commit();
}
}
return true;
}
}
class frag extends Fragment
{
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
return inflater.inflate(R.layout.a, container, false);
}
}