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Pass data from an Activity to a fragment [duplicate]

This question already has answers here:
Send data from activity to fragment in Android
(22 answers)
Closed 1 year ago.
I am a little bit lost in this, so I already passed data from my LoginActivity to my DashboardActivity. And it works now (thank god). But now, I would love to pass that data to a fragment.
I have this on my DashboardActivity:
Intent get = getIntent();
String userId = get.getStringExtra(LoginActivity.EXTRA_ID);
Bundle bundle = new Bundle();
bundle.putString("userId", userId);
Fragment fragment = new Fragment();
fragment.setArguments(bundle);
I have this on my Fragment:
Bundle bundle = getArguments();
String userId = bundle.getString("userId");
int uid = Integer.parseInt(userId);
Is it like this?

Getting data in Fragment and Activity are not done in the same way.
To send extra to a fragment, You can do it this way.
In your Activity Class
Bundle bundle = new Bundle();
bundle.putString("userId", "value you want to send");
FragmentClass frag = new FragmentClass();
frag.setArguments(bundle);
Then in Fragement onCreateView
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
String strtext = getArguments().getString("userId");
return inflater.inflate(R.layout.fragment, container, false);
}
The issue with your code is you're getting the argument with a wrong id.
Right way
String userId = getArguments().getString("userId");

From activity to fragment you should use bundle as below
Bundle bundle = new Bundle();
bundle.putString(LoginActivity.EXTRA_ID, "Extra value");
Fragment fragment = new Fragment();
fragment.setArguments(bundle);
Then in your Fragment, get the data for example in onCreate() method
Bundle bundle = this.getArguments();
if (bundle != null) {
String extraId = bundle.getString(key, defaultValue);
}

SavedInstanceStateNull between Fragments is null

I have a fragment which shows a list of buttons, each have their own id. When the user clicks the button, I am trying to replace the current fragment with another. Right after I replace the fragment, I a am adding arguments to the bundle. From what I can tell from debug mode, that part is working 100%. However, when we get to the new fragment, the "savedInstanceState" state will always be null.
I have read several posts on this however, I am confused because I am attempting to set the bundle and replace the fragment the same way I did when going from the activity to the first fragment and it is still not working.
MyActivity.java (this is working and all values are being set):
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
MyFirstFragment fragment = new MyFirstFragment();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame,fragment);
fragmentTransaction.commit();
Intent i = getIntent();
value = i.getExtras().getString("key");
Bundle bundle = new Bundle();
bundle.putString("key",value);
fragment.setArguments(bundle);
}
MyFirstFragment.java (also working):
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_first, container, false);
final String value = getArguments().getString("key");
myButton.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
String gid = Integer.toString(v.getId());
MySecondFragment secondfragment = new MySecondFragment();
Bundle secondFragmentBundle = new Bundle();
secondFragmentBundle.putString("key",value);
secondFragmentBundle.putString("id",id);
secondfragment.setArguments(secondFragmentBundle);
FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame,secondfragment);
fragmentTransaction.commit();
}
});
MySecondFragment (getting null for savedInstanceState and all bundle agruments!):
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment_second, container, false);
value = getArguments().getString("key");
id = getArguments().getString("id");
}

You cannot set arguments on a Fragment after it is attached to an Activity.
Your issue is caused by confusion about Fragment creation. What you provided in your question is not the correct way to send arguments to another Fragment type.
The de-facto standard way of passing arguments to a Fragment when it is created it to use a static factory method, generally called newInstance(). You should set the arguments this way, and should do so before committing the FragmentTransaction - however, you technically could do it right after committing the transaction with no ill effects. This is because when a Fragment is committed, it isn't immediately attached/created, rather, it is queued on the main thread.
Here is how you would do it:
Write a method in your Fragment class called new instance. Be sure to leave a public default (no arguments) constructor for the system to handle things in the background.
public MyFirstFragment extends Fragment {
public MyFirstFragment(){
//constructor - don't use this to create a new fragment directly
}
public static MyFirstFragment newInstance(String argument1, String argument2) {
// This is where you set the Fragment arguments:
MyFirstFragment instance = new MyFirstFragment();
Bundle arguments = new Bundle();
// add whatever arguments you need to the bundle
arguments.putString("ARGUMENT_1_KEY", argument1);
arguments.putString("ARGUMENT_2_KEY", argument2);
//Set the arguments on the new fragment instance
instance.setArguments(arguments);
return instance;
}
// recover the values in onCreate:
#Override
public void onCreate(Bundle savedInstanceState) {
// an easy way to check if this is a new instance is to null-check the saved state Bundle
if (savedInstanceState == null) {
String argument1 = getArguments().getString("ARGUMENT_1_KEY");
String argument2 = getArguments().getString("ARGUMENT_2_KEY");
} else {
// restore whatever you need from savedInstanceState bundle
}
}
Key point - the arguments are passed into the newInstance() method (these can be whatever you want, as long as the type is allowed). The newInstance() method enforces argument types and also prevents setting them after the fragment is already attached to an activity.
After this, in your Activity.onCreate() method:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String argument1 = "some information";
String argument2 = "other information";
MyFirstFragment fragment = MyFirstFragment.newInstance(argument1, argument2);
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame,fragment);
fragmentTransaction.commit();
}

Android: How to add multiple of the same fragment using a loop

I am fairly new to android development, and I'm trying to make a small app that lists names with a few action buttons placed beside each name. My plan was to loop through the list of names, and add a fragment for each one, forming a list of them on the screen.
Right now I was trying to test out the following code. I want to add the fragment "fragTest", to "fragPlaceHolder" in the activity.
This is what my code looks like:
//Begin the transaction
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
//Replace the contents of the container with the new fragmentTest
for (int i = 0; i < listLength; i++){
ft.add(R.id.fragPlaceHolder, new fragmentTest());
}
//Complete the changes
ft.commit();
However when I do this, only one fragment ever seems to be added. And if it did work, how would I pass a name as an argument?

Use fragmentTransaction.AddToBackStack(null) in your code.
You can send data to fragment with intent:
Bundle bundle=new Bundle();
bundle.putString("message", "From Activity");
//set Fragmentclass Arguments
Fragmentclass fragobj=new Fragmentclass();
fragobj.setArguments(bundle);
Recieve data in fragment:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
String strtext=getArguments().getString("message");
return inflater.inflate(R.layout.fragment, container, false);
}

Android - How do I manage multiple instances of a single fragment with different content?

I want to be able to setText and getText of Views of individual Fragments. As it is now, when I setText of a Framgent's TextView it changes the text of that View in all Fragments.
I've been experimenting by moving things around, but here is my code as of this moment:
Fragment class
public class TestFragment extends Fragment{
View view;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.test_fragment, container, false);
TextView tv = (TextView) view.findViewById(R.id.huh);
//tv.setText("AAAAAAAAAAAAAAAAAAA");
return view;
}
public void setText(String asdf) {
TextView test = (TextView) view.findViewById(R.id.huh);
test.setText(asdf);
}
}
Activity Class
public class Manage extends BaseActivity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.manage);
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
TestFragment fragment = new TestFragment();
//fragment.setText("ASDF");
fragmentTransaction.add(R.id.test_fragment, fragment, "testtag");
fragmentTransaction.commit();
}
}
The framgent.xml is pretty plain; just a single TextView.

Fragments are added to stack with a parameter named tag. In your case you've added your fragment with "testtag".
fragmentTransaction.add(R.id.test_fragment, fragment, "testtag");
If you create multiple instances of same fragment and add them with unique tags, then you are able to get them with that unique tags. When you get a fragment then you can reach its content.
FragmentManager fm = this.getSupportFragmentManager();
Fragment testtagFragment = fm.findFragmentByTag("testtag");
View targetView = testtagFragment.getView().findViewById(R.id.anyViewInsideContentOfYourFragment);
Edit:
I want to be able to setText and getText of Views of individual
Fragments.
This question has 2 parts.
To setText while initializing you have to pass your initial
parameters to your fragment while creating its instance. I suggest
you to use a static newInstance method for this. See sample
here
To getText read my answer above. Note that, you can get the content of a fragment after its onCreateView method is executed. So If you try to call getView method of a fragment at your activities onCreate method (after you add the fragment), that will return null. You can get its content successfully under a click event to test that, and use get or set operations of any view on that fragment's content.

How to pass string from one Fragment to another? [duplicate]

This question already has answers here:
How to pass values between Fragments
(18 answers)
Closed 7 years ago.
I want to pass a string call custID from one fragement to anopther. but I don't know how to pass it. Below is my code:
class TabsAdapter extends FragmentPagerAdapter {
public TabsAdapter(FragmentManager fm) {
super(fm);
}
#Override
public int getCount() {
return 2;
}
#Override
public Fragment getItem(int i) {
switch(i) {
case 0: return MaterialUpConceptFakePage.newInstance();
case 1: return MaterialUpConceptFakePage.newInstance();
}
return null;
}
#Override
public CharSequence getPageTitle(int position) {
switch(position) {
case 0: return "Tab 1";
case 1: return "Tab 2";
}
return "";
}
}
Can someone help me on this?

Bundle bundle=new Bundle();
bundle.putString("ID", "value");
MyFragment obj=new MyFragment ();
obj.setArguments(bundle);

well you can use bundle as below -
Fragment fragment = new Fragment();
Bundle bundle = new Bundle();
bundle.putInt(key, value);
fragment.setArguments(bundle);
getFragmentManager()
.beginTransaction()
.replace(R.id.body, fragment, null)
.commit();
and then inside onCreateView() you can receive as below -
Bundle args = getArguments();
int myInt = bundle.getInt(key, defaultValue);

User Bundle to pass any value from one Fragment to another. This is how you can pass string from one Fragment to another.
Put the value
SecondFragment secondFragment = new SecondFragment ();
Bundle args = new Bundle();
args.putString("MyKey", "MyValue");
secondFragment.setArguments(args);
Load the second fragment
getFragmentManager().beginTransaction().add(R.id.container, secondFragment).commit();
In onCreateView of the second Fragment:
//Retrieve the value
String value = getArguments().getString("MyKey");

While a simple Bundle like other answers works, I can already see you use the newInstance so I will show you an example while still using newInstance to make the code easier to maintain in the future.
In your fragment where you want the String to be add this code
public static YourFragmentName newInstance(String str) {
YourFragmentName fragment = new YourFragmentName ();
Bundle args = new Bundle();
args.putSerializable("customer_id", str);
fragment.setArguments(args);
return fragment;
}
Then looking at your code instead of
MaterialUpConceptFakePage.newInstance()
you should have
MaterialUpConceptFakePage.newInstance(customerid)
Then inside your onCreateView
String customer_id = (String) getArguments().get("customer_id");

SharedPreference is a good way for passing data between activities or fragment. You can send any data int,boolean, string int etc.
SharedPreferences preference;
//Initialize preference
preference = getActivity().getSharedPreferences("STATE",MODE_PRIVATE);
// it uses key-value pairs
// put string data to preference
preference.edit().putString("Your_String_Data", "anything").commit();
//use this to get that value in any fragment.
preference = getActivity().getSharedPreferences("STATE",
Context.MODE_PRIVATE);
String data = preference.getString("Your_String_Data",null);