I am trying to implement card flip animation to my fragments, I am following the tutorial at the Developer website http://developer.android.com/training/animation/cardflip.html
However I am getting a weird error, I downloaded the sample app from the Developer website, which to my amazement works fine but when I replace the code in my particular activity it gives me an error:
The method setCustomAnimations(int, int) in the type FragmentTransaction is not applicable for the arguments (int, int, int, int)
Here is the problem code:
private View.OnClickListener on = new View.OnClickListener() {
#Override
public void onClick(View v) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager
.beginTransaction();
fragmentTransaction.setCustomAnimations(
R.animator.card_flip_right_in, R.animator.card_flip_right_out,
R.animator.card_flip_left_in, R.animator.card_flip_left_out);
//Fragment1_2 fragment1_2 = new Fragment1_2();
fragmentTransaction.replace(R.id.realtabcontent, new Fragment1_2());
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
};
Edit
If I comment the first two or the last two arguments to setCustomAnimation, everything just works fine, however I dont get the animation back press which I know is an implementation issue. Below is the complete code of this fragment's class file:
public class FragmentTab1 extends Fragment {
MenuItem mMenuItem;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragmenttab1, container, false);
ActionBar actionBar = getActivity().getActionBar();
// actionBar.setSubtitle("mytest");
actionBar.setTitle("Reminders");
setHasOptionsMenu(true);
Button b = (Button)rootView.findViewById(R.id.button1);
b.setOnClickListener(on);
b.setText("Check");
return rootView;
}
private View.OnClickListener on = new View.OnClickListener() {
#Override
public void onClick(View v) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager
.beginTransaction();
fragmentTransaction.setCustomAnimations(
// R.animator.card_flip_right_in, R.animator.card_flip_right_out);
R.animator.card_flip_left_in, R.animator.card_flip_left_out);
//Fragment1_2 fragment1_2 = new Fragment1_2();
fragmentTransaction.replace(R.id.realtabcontent, new Fragment1_2());
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
};
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater =getActivity().getMenuInflater();
inflater.inflate(R.menu.main, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
mMenuItem = item;
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager
.beginTransaction();
switch (item.getItemId()) {
case R.id.info:
FragmentContact fragmentcontact = new FragmentContact();
fragmentTransaction.replace(R.id.realtabcontent, fragmentcontact, "Fragment1_2");
mMenuItem.setEnabled(false);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
break;
default:
break;
}
return true;
}
#Override
public void onStart(){
ActionBar actionBar = getActivity().getActionBar();
actionBar.setTitle("Reminders");
FragmentManager Fm = getFragmentManager();
Fm.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
super.onStart();
}
#Override
public void onResume(){
ActionBar actionBar = getActivity().getActionBar();
actionBar.setTitle("Reminders");
FragmentManager Fm = getFragmentManager();
Fm.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
super.onResume();
}
}
Any hints where I am going wrong would be regarded in great esteem!
Related
I've added a Navigation drawer activity to my project and I'm trying to add items as fragments. This is what I have done in the main activity.
fragmentManager = getSupportFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.nav_host_fragment, new HomeFragment());
fragmentTransaction.commit();
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item)
{
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
int id = item.getItemId();
if (id == R.id.nav_home)
{
fragmentManager = getSupportFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.nav_host_fragment, new HomeFragment());
fragmentTransaction.commit();
}
else if(id == R.id.Shopping_list)
{
fragmentManager = getSupportFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.nav_host_fragment, new ShoppingListFragment());
fragmentTransaction.commit();
}
else if(id == R.id.nav_Language)
{
fragmentManager = getSupportFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.nav_host_fragment, new FragmentLang());
fragmentTransaction.commit();
}
The default fragment is Home which is working fine and as expected BUT the other fragments are overlapping with the Home Fragment. (The HomeFragment is the only one that's working fine).
I've done something like this inside every Fragment class:
public class ShoppingListFragment extends Fragment{
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
View view = inflater.inflate(R.layout.fragment_shopping_list, container,false);
return view;
}
}
I can't see where the mistake is. everything looks good but all other fragments are showing over the HomeFragment.
fragment manager maintains the stack of all the previous fragments that are replaced sometimes the back stack fragments overlap with the fragment we replaced, add this line
fragmentManager.popBackStack();
like this,
fragmentManager = getSupportFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.nav_host_fragment, new HomeFragment());
fragmentManager.popBackStack();
fragmentTransaction.commit();
Hope will help. Happy coding :)
This use Navigation Drawer, and use Tab, and use Fragment.
MainActivity.java
public class MainActivity extends AppCompatActivity {
DrawerLayout myDrawerLayout;
NavigationView myNavigationView;
FragmentManager myFragmentManager;
FragmentTransaction myFragmentTransaction;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
myNavigationView = (NavigationView) findViewById(R.id.nav_drawer) ;
myFragmentManager = getSupportFragmentManager();
myFragmentTransaction = myFragmentManager.beginTransaction();
myFragmentTransaction.replace(R.id.containerView, new HomeFragment()).commit();
myNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(MenuItem selectedMenuItem) {
myDrawerLayout.closeDrawers();
if (selectedMenuItem.getItemId() == R.id.nav_item_select1) {
FragmentTransaction fragmentTransaction = myFragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.containerView, new Select1()).commit();
}
return false;
}
}
}
}
Pyeondo.java
You have to use same fragment in which you are setting bundle.
Replace new select1() with fragment
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
bundle.putString("Slocale1",SbtnsLocale.getText().toString());
bundle.putString("Slocale2",SbtneLocale.getText().toString());
bundle.putString("Sdate1",StxtsDate.getText().toString());
bundle.putString("Sdate2",SStxtsDate.getText().toString());
bundle.putString("Sseat",StxtSeat.getText().toString()); // use as per your need
fragment.setArguments(bundle);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.replace(R.id.containerView, fragment).commit();
You already has fragment instance
fragment.setArguments(bundle);
and you are setting argument in that instance so don't create new one, use it
fragmentTransaction.replace(R.id.containerView, fragment).commit();
From my main activity, pressing Settings button opens an AppCompatActivity with FrameLayout as the container for the fragments. In OnCreate method, I'm adding the fragment which is a PreferenceScreen container.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.settings);
Toolbar toolbar = (Toolbar) findViewById(R.id.custom_toolbar);
setSupportActionBar(toolbar);
ActionBar ab = getSupportActionBar();
if (ab != null) {
ab.setDisplayHomeAsUpEnabled(true);
ab.setTitle("Settings");
}
FragmentManager fragmentManager = getSupportFragmentManager();
Fragment fragment = null;
if (savedInstanceState == null) {
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragment = SettingsFragment.newInstance(null);
fragmentTransaction.add(R.id.fragment_container, fragment);
fragmentTransaction.commit();
}
}
Pressing again another button called Options, opens replaces fragment with Options fragment adding the current class to backstack.
#Override
public boolean onPreferenceStartScreen(PreferenceFragmentCompat caller, PreferenceScreen pref) {
FragmentManager manager = getSupportFragmentManager();
SettingsSubscreenFragment fragment = null;
Bundle args = new Bundle();
switch (pref.getKey()) {
case "pref_key_rejection_options":
getSupportActionBar().setTitle("Rejection Options");
fragment = SettingsSubscreenFragment.newInstance("Options");
break;
}
args.putString(PreferenceFragmentCompat.ARG_PREFERENCE_ROOT, pref.getKey());
if (fragment != null) {
fragment.setArguments(args);
}
FragmentTransaction ft = manager.beginTransaction();
ft.replace(R.id.fragment_container, fragment, pref.getKey());
ft.addToBackStack(null);
ft.commit();
return true;
}
When I press the Up Button, I'm just replacing the Options fragment to the first fragment, Settings, which does not pop the back stack.
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
getSupportActionBar().setTitle("Settings");
FragmentManager fragmentManager;
FragmentTransaction ft;
Fragment fragment = null;
if (getSupportFragmentManager().findFragmentByTag("pref_key_options") != null) {
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
fragment = SettingsFragment.newInstance(null);
ft.replace(R.id.fragment_container, fragment);
ft.commit();
fragmentManager.getFragments().clear();
return true;
} else {
return super.onOptionsItemSelected(item);
}
}
return super.onOptionsItemSelected(item);
}
So, opening the Options fragment again will add another to back stack and onBackPress, it only pops the topmost and leaves its shadow overlapping the other one registered in back stack.
#Override
public void onBackPressed() {
int backStackCount = getSupportFragmentManager().getBackStackEntryCount();
if (backStackCount >= 1) {
getSupportActionBar().setTitle("Settings");
getSupportFragmentManager().popBackStack();
} else {
super.onBackPressed();
}
}
The almost the same situation is like from here, third picture of the question, but I can't make it work with their suggestions.
What am I doing wrong and what I can do to make this work? Thanks a lot.
Check FragmentTransaction , SettingsSubscreenFragment and SettingsFragmentare extending android.support.v4.app.Fragment . If not , try
class YourFragments extends android.support.v4.app.Fragment
in your fragment classes.
Hello I'm trying to override back button to back to home page it gives me this error when press back from BasicInfoFragment then press back again in home fragment (MainFragment)
it gives
java.lang.NullPointerException: Attempt to invoke virtual method 'android.support.v4.app.FragmentManager android.support.v4.app.FragmentActivity.getSupportFragmentManager()' on a null object reference
then the application crushs
java.lang.NullPointerException: Attempt to invoke virtual method 'android.support.v4.app.FragmentManager android.support.v4.app.FragmentActivity.getSupportFragmentManager()' on a null object reference
at com.teqneia.blooddonation.BasicInfoFragment.doBack(BasicInfoFragment.java:245)
at com.teqneia.blooddonation.MainActivity.onBackPressed(MainActivity.java:258)
at android.app.Activity.onKeyUp(Activity.java:2530)
at android.view.KeyEvent.dispatch(KeyEvent.java:2726)
at android.app.Activity.dispatchKeyEvent(Activity.java:2798)
at android.support.v7.app.AppCompatActivity.dispatchKeyEvent(AppCompatActivity.java:543)
at android.support.v7.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:53)
at android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallbackBase.dispatchKeyEvent(AppCompatDelegateImplBase.java:315)
at android.support.v7.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:53)
at com.android.internal.policy.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:2368)
at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:4333)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4295)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3836)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3889)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3855)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3981)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3863)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4038)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3836)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3889)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3855)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3863)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3836)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3889)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3855)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4014)
at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:4175)
at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:2378)
at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:1999)
at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:1990)
at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:2355)
at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:141)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:330)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5546)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)
BasicInfoFragment java
public class BasicInfoFragment extends Fragment implements MainActivity.OnBackPressedListener, View.OnClickListener {
.
.
public BasicInfoFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_basic_info, container, false);
initialize(view);
// Inflate the layout for this fragment
return view;
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
((MainActivity) getActivity()).setOnBackPressedListener(this);
}
void initialize(View view) {
//VIEW OLD DATA AND ADD LISTENERS
name = (EditText) view.findViewById(R.id.name_edit);
email = (EditText) view.findViewById(R.id.email_edit);
mobile = (EditText) view.findViewById(R.id.mobile_edit);
LastDonation = (EditText) view.findViewById(R.id.date_edit);
LastDonation.setInputType(InputType.TYPE_NULL);
LastDonation.requestFocus();
LastDonation.setOnClickListener(this);
//TAKE DATA FROM SERVER
//name.setText("");
//email.setText();
//mob.setText();
//LastDonation.setText();
b = (Button) view.findViewById(R.id.save_edit);
b.setOnClickListener(this);
//get Radio Groups
radioBgGroup = (RadioGroup) view.findViewById(R.id.bg_edit);
radioRhGroup = (RadioGroup) view.findViewById(R.id.rh_edit);
if (mSharedGetter.getBloodType().equals("A")) {
}
#Override
public void doBack() {
Fragment fragment = null;
fragment = new MainFragment();
FragmentManager fm = getActivity().getSupportFragmentManager();
FragmentTransaction transaction = fm.beginTransaction();
transaction.replace(R.id.fragment_container, fragment);
transaction.commit();
}
MainActivity
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
.
.
.
.
.
.
protected OnBackPressedListener onBackPressedListener;
public interface OnBackPressedListener {
void doBack();
}
public void setOnBackPressedListener(OnBackPressedListener onBackPressedListener) {
this.onBackPressedListener = onBackPressedListener;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Initially Load MainFFragment xml
setContentView(R.layout.activity_main);
Fragment fragment = new MainFragment();
//Apply fragment
FragmentTransaction fragmentTransaction =
getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
View header = navigationView.getHeaderView(0);
TVnav_name = (TextView) header.findViewById(R.id.nav_name);
navigationView.setNavigationItemSelectedListener(this);
TVnav_name.setText(mSharedGetter.getUserName());
}
#Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else if (onBackPressedListener != null)
onBackPressedListener.doBack();
else
super.onBackPressed();
}
#Override
protected void onDestroy() {
onBackPressedListener = null;
super.onDestroy();
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
Fragment fragment = null;
if (id == R.id.nav_edit_info) {
fragment = new BasicInfoFragment();
if (fragment != null) {
//Apply fragment
FragmentTransaction fragmentTransaction =
getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();
}
} else if (id == R.id.nav_home) {
fragment = new MainFragment();
if (fragment != null) {
//Apply fragment
FragmentTransaction fragmentTransaction =
getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragment, "MY_FRAGMENT");
fragmentTransaction.commit();
}
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
MainFragment
public class MainFragment extends Fragment{
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_main, container, false);
return view;
}
//DIALOG BUILDER
new AlertDialog.Builder(getActivity())
.setTitle("DONATION REQUEST")
.setView(dialogView)
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
}
})
.setPositiveButton("Request now", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//Send the request
Dialog f = (Dialog) dialog;
}
}).show();
}
}
in doBack method getActivity() is returning null. It is also not needed as you can call getFragmentManager() from a Fragment. Here's how to do just that, with fewer lines.
#Override
public void doBack() {
Fragment fragment = new MainFragment();
getFragmentManager().beginTransaction()
.replace(R.id.fragment_container, fragment)
.commit();
}
in your BasicInfoFragment you have
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
((MainActivity) getActivity()).setOnBackPressedListener(this);
}
MainFragment should have the same line, otherwise pressing back twice as you described will invoke BasicInfoFragment doBack() twice.
Since you detach it from its activity after the first back click you get a null value from getActivity() here when the second back arrives:
FragmentManager fm = getActivity().getSupportFragmentManager();
Always call like this.
//In Activity
FragmentManager fm = getSupportFragmentManager();
//In Fragment
FragmentManager fm = getActivity().getFragmentManager();
//For Nested Fragments
FragmentManager fm = getChildFragmentManager();
I think it would be better if you describe what you are trying to solve. I believe you may be having an error in the concept of how fragments work and the management of the back stack.
I believe the problem is your back event is being triggered but this is popping the fragment out but the reference is still there.
Take a look at:
https://aarcoraci.wordpress.com/2017/02/13/android-tutorial-drawer-and-fragment-navigation-made-easyier/
I am making a simple demo project using Fragments, in which i am calling SecondFragment from FirstFragment on button click.
And i called SecondFragment without any issue, but i getting view of both the Fragments SecondFragment and FirstFragment
So where i am doing mistake ?
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new FirstFragment()).commit();
}
}
public static class FirstFragment extends Fragment {
Button buttonCallSecondFragment;
public FirstFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_first, container,
false);
buttonCallSecondFragment = (Button) rootView.findViewById(R.id.button1);
buttonCallSecondFragment.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
FragmentManager fm = getFragmentManager();
SecondFragment fragment = new SecondFragment();
FragmentTransaction ft = fm.beginTransaction();
ft.add(R.id.container, fragment);
ft.commit();
}
});
return rootView;
}
}
public static class SecondFragment extends Fragment {
public SecondFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_second, container,
false);
return rootView;
}
}
}
You need to remove the first fragment, you can do that either by usingreplace or first calling remove then add
To be able to press the back button add the transaction to the back stack,you do that by calling addToBackStack(tag) on your fragment manager. Tag may be null.
You are adding fragment on already displaying fragment in your android app.
FragmentTransaction ft = fm.beginTransaction();
ft.add(R.id.container, fragment);
ft.commit();
Do not add fragment but replace fragment when already one fragment is loaded on activity.
So for implementing that :
Please add your code in OnCreate() and add below code to your click listener :
FragmentManager fm = getFragmentManager();
SecondFragment fragment = new SecondFragment();
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.container, fragment);
ft.addToBackStack(null);
ft.commit();
Thank you.!!
if you want to replace fragment you should call replace in place of add :
buttonCallSecondFragment = (Button) rootView.findViewById(R.id.button1);
buttonCallSecondFragment.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
FragmentManager fm = getFragmentManager();
SecondFragment fragment = new SecondFragment();
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.container, fragment);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.addToBackStack(null);
ft.commit();
}
});
You are adding the fragment so it will come on top of another fragment give background color to rootview of scecond fragment
you can also load that as Nested fragment
public void addFragB() {
FragmentManager childFragMan = getChildFragmentManager();
FragmentTransaction childFragTrans = childFragMan.beginTransaction();
SecondFragment 2ndfrag = new SecondFragment();
childFragTrans.add(R.id.fragA_LinearLayout, 2ndfrag);
//childFragTrans.addToBackStack("");
childFragTrans.commit();
}
No, you cannot communicate between fragments like this. You need to communicate between fragments via the container activity.
I suggest, you make a navigation method in your activity and switch/call between fragments from there.
Below is a small snippet:
In your container activity:
Fragment fragment;
public void navigateTo(Fragment newFragment,boolean addToBackStack) {
this.fragment = newFragment;
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction ft = manager.beginTransaction();
ft.replace(R.id.fragment_container, newFragment);
if(addToBackStack)
ft.addToBackStack(fragment.getClass().getSimpleName());
ft.commit();
}
If you are going from Fragment1 to Fragment2 then in your Fragment1 do the following:
((YourContainerActivity) getActivity()).navigateTo(new Fragment2(),false); //if you want to add to back stack make 2nd argument true.
private void selectItem(int position) {
selectedPosition = position;
// update the main content by replacing fragments
fragment = null;
fragmentStack = new Stack<Fragment>();
switch (position) {
case 0:
fragment = new Fragment1();
break;
case 1:
fragment = new Fragment2();
break;
}
//redirect the screen
if (fragment != null) {
fragmentManager = getSupportFragmentManager();
redirectScreen(fragment);
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(title[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
}