Develop Reference

Return from activity to last visited intent

I have a main activity that exists out of three fragments. Fragment 2 is the main fragment. On fragment 3 I have a button. Once I click the button it directs the user to a ChatActivity. The ChatActivity has an onBackButtonPressed that should return the user back to fragment 3. However, it seems that it would always return the user to fragment 2 (the main fragment).
How can I bring the user to the fragment they last visited, or at least back to fragment 3?
Edit:
I added this block of code in the button onClick function:
ChatFragment fragment = new ChatFragment();
FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.add(R.id.main_tabPager, fragment);
transaction.addToBackStack(null);
transaction.commit();
When I click the back button in the activity it does not return me to fragment 3 but instead rebuild the fragmentpager and start back at Fragment 2.

When you are opening fragment 3 from main fragment (fragment 2), add fragment 3 into backstack like this:
Fragment3 fragment3 = new Fragment3();
getSupportFragmentManager().beginTransaction().add(R.id.content, fragment3).addToBackStack(null).commit();
You should add all fragments to backstack that you want to return to

Ideally addToBackStack() on fragment transaction should be enough as per documentation, but it seems not true at times, so we have to handle the popping up of the back stack upon Back button pressed by ourselves. I added this to my activity and it worked as expected:
#Override
public void onBackPressed() {
if (getFragmentManager().getBackStackEntryCount() > 0 ){
getFragmentManager().popBackStack();
} else {
super.onBackPressed();
}
}
Hope it helps.

Handle OnBackPress from Fragment

I have 3 fragments Fragment1, Fragment2 and Fragment3 and navigation is like
Fragment1->Fragment2->Fragment3
But on back press From Fragment3 go back to Fragment2 after completing some task like from Fragment2. And from Fragment1 finish this activity.
what will be the best method to do this task.

As per your question just you have to add addToBackStack() method before commit() transaction.
for example:
FirstFragment firstFragment = new FirstFragment();
getSupportFragmentManager().beginTransaction()
.replace(R.id.article_fragment, firstFragment)
.addToBackStack(null).commit();
Add second and third fragment same as above manner and just add code in onBackPressed() Override method.
for example:
#Override
public void onBackPressed() {
if (getFragmentManager().getBackStackEntryCount() > 0) {
getFragmentManager().popBackStack();
} else {
super.onBackPressed();
}
}

Please follow the process.
1. When you add fragment add below code to your code
fragmentTransaction.addToBackStack(null);
Then back button handle from the activity.
#Override
public void onBackPressed() {
if (getFragmentManager().getBackStackEntryCount()>0){
getFragmentManager().popBackStack();
}else {
super.onBackPressed();
} }
It will be working perfectly. Happy coding.

There is no need to handle OnBackPress inside Fragment. When you performing Fragment transaction, you can put your fragment to BackStack:
When there are FragmentTransaction objects on the back stack and the user presses the Back button, the FragmentManager pops the most recent transaction off the back stack and performs the reverse action (such as removing a fragment if the transaction added it).
More details you can get from this article.

Back in fragment and nested fragment

i have app like this
one activity and inside it >
fragment a (loaded when run app also from menu can open it )
fragment b (open it from just menu)
fragment c (can open it from fragment a and also can open it from menu)
also inside fragment c there are 4 child fragments
in main activity(using navigation drawer as source) i call fragment a in oncreate like this
FragmentManager fragmentManager=getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.fragment_place,new First_Fragment()).addToBackStack("First").commit();
my problem is how to control back button to always back to fragment a and when fragment a is open close app
i was using addToBackStack(null) but is not what i want because will show all history of fragments that i opened

When adding fragment a to the back stack "addToBackStack(String name)" pass in a name.
Then listen for on back presses in your fragments
FragmentManager fm = getFragmentManager();
fm.addOnBackStackChangedListener(new OnBackStackChangedListener() {
#Override
public void onBackStackChanged() {
}
});
make sure to stop listening when each fragment is not being shown.
Then you can pop back to the named fragment added to the back stack
FragmentManager fm = getActivity()
.getSupportFragmentManager();
fm.popBackStack ("name", FragmentManager.POP_BACK_STACK_INCLUSIVE);
Make sure the rest of your fragment transactions are not added to the back stack. This should give you the behavior you want.

addToBackStack(String tag) is used to add the fragment to backstack and it contains the string as parameter. This parameter can be null or have some value.
If you pass null, it will add your fragment to backstack with tag null. addToBackStack(null) doesn't mean that your fragment is not added to backstack.
If you want your fragment will not be added to backstack, then just delete this line.
If you are adding your fragment to backstack and want it to be visible onBackPressed, then you can use
getSupportFragmentManager().popBackStackImmediate(/* Fragment TAG */,0);
CODE:- Try the below code and let me know.
Copy the below function in your main Activity.
/**
* function to show the fragment
*
* #param name fragment to be shown
* #param tag fragment tag
*/
public void showFragment(Fragment name, String tag) {
FragmentManager fragmentManager = getSupportFragmentManager();
// check if the fragment is in back stack
boolean fragmentPopped = fragmentManager.popBackStackImmediate(tag, 0);
if (fragmentPopped) {
// fragment is pop from backStack
} else {
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, name, tag);
fragmentTransaction.addToBackStack(tag);
fragmentTransaction.commit();
}}
Show fragment using the below code.
showFragment(yourFragment, yourFragmentTag);
In mainActivity onBackPressed.
#override
public void onBackPressed(){
FragmentTransaction fts = getSupportFragmentManager().beginTransaction();
FragmentManager fragmentManager = getSupportFragmentManager();
if (fragmentManager.getBackStackEntryCount() >= 2) {
// always show your fragment a here
showFragment(new FragmentA(), FragmentA.class.getSimpleName());
} else {
// finish your activity
}
}

how to back to previous fragment on pressing manually back button

I have one activity and multiple fragments in my app. i want to back one by one fragments when pressing back button which in all fragments.
i used this code segment but when pressing back button it comes to main activity without back one by one. Also i want to change the icon when it's comes to the main activity.(msg_alert)
btnBack.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
FragmentManager fm = MainActivity.this
.getSupportFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
Fragment fragment = new MainMenuLayout();
ft.replace(R.id.activity_main_content_fragment, fragment);
ft.commit();
btnBack.setVisibility(View.VISIBLE);
btnBack.setImageResource(R.drawable.msg_alert);
tvTitle.setText("Layout 0");
}
});

Lets say you are having two fragments A and B. Fragment A is is attached at the startup of activity and on any user event you navigate to fragment B by replacing the Fragment A.
1) while adding Fragment B to the activity
// Works with either the framework FragmentManager or the
// support package FragmentManager (getSupportFragmentManager).
getSupportFragmentManager().beginTransaction()
.replace(R.id.container, fragmentB, "detail")
// Add this transaction to the back stack
.addToBackStack()
.commit();
2) override the onBackPressed of the activity to handle the back button press event.
#override
public void onBackPressed() {
// is there any fragment in backstack, if yes popout.
if (getSupportFragmentManager().getBackStackEntryCount() > 0) {
getSupportFragmentManager().popBackStack();
return;
}
super.onBackPressed();
}

this is one more option ,
in the Activity.
Fragment secondfragment= new SecondFragmnet();
#Override
public void onBackPressed() {
if(secondfragment.isVisible()){
// replace 1st fragment
}else{
// Alert dialog for Exit App
}
// you can check multiple fragments.
Hope it helps you

You have to Use addToBackStack() method while doing Transaction Between Fragments...
Read This : Implement Back Navigation for Fragments
Use Following code when you use Fragment Transaction...
String backStateName = fragment.getClass().getName(); // getting Fragment Name..
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment)
.addToBackStack(backStateName) //adding it to BackStack..
.commit();

In Fragments we dont have back navigation..
We can acheive that through replace() method.

I seen in your code that you are only replace the content frame. and so the result is backpress it comes to activity.
Also be sure that you have your mannual back button in the activity
this is test xml for activity
<?xml version="1.0" encoding="utf-8"?>
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Back" />
<FrameLayout
android:id="#+id/activity_main_content_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</FrameLayout>
Use
Fragment fragment = new MainMenuLayout();
ft.replace(R.id.activity_main_content_fragment, fragment);
ft.addToBackStack(null);// TODO parameter here it tag of fragment or null or "" String
ft.commit();
For more information about fragments backstack go through this android developer refrence :-Fragment BackStack

Fragment still visible after pressing the back button

I want to have a Fragment which provides the ability to create someting.
After that i want to show the new "someting" in another fragment. After pressing the back button on the device i want to go back to the MainFragment and not to the CreateFragment (this works well). But after that the ShowFragment is still visible.
Here is my code:
In my MainActivity i got a MainFragment which has a button "Create".
After tap the button i load a "Create" Fragment.
fragmentManager.beginTransaction()
.replace(R.id.container, CreateFragment.newInstance())
.addToBackStack("Create")
.commit();
If the user has entered some details he taps the "Ok" Button. This fires the following on the MainActivity.
fragmentManager.beginTransaction()
.replace(R.id.container, ShowFragment.newInstance(id))
.commit();
So far so good, but here comes the problem.
If the user taps the back button on the device he gets back to the MainFragment BUT the ShowFragment is still visible (under the MainFragment).
Update
This is what happens:
MainFragment > CreateFragment > ShowFragment > (BACK Button) > MainFragment (ShowFragment in the back)

Just pop the ShowFragment from the stack on the onBackPress Event as below:
#Override
public void onBackPressed() {
final Fragment fragment = fragmentManager.findFragmentById(R.id.container);
if (fragment != null) {
fragmentManager.popBackStack();
} else {
super.onBackPressed();
}
}

Press the back button of fragment ShowFragment within your ShowFragment fragment will call the onBackPressed() method. Then when you call method popBackStack(), it will return you back to the CreateFragment.
Sample code -
public void onBackPressed()
{
FragmentManager fm = getActivity().getSupportFragmentManager();
fm.popBackStack();
}
See the post how-to-back-to-previous-fragment-on-pressing-manually-back-button-of-indivisual-fragment for more info with similar situation.