I want to create same fragment multiple times in view pager with different arguments how can i do it?
Now i have a static single argument constructor in a fragment which i call to initialize the fragment
Is there a simple way to do this.
You could use setArguments() method, for each of your Fragment. Do something like this:
Fragment myFragment = new Fragment();
Bundle data = new Bundle();
data.putString("data_1","Hello");
myFragment.setArguments(data);
Then in your Fragment, do this:
Bundle data = getArguments();
String data_1 = data.getString("data_1");
I'm trying to send a Parcelable array from MainActivity to one of its fragment using bundle. My code is
Bundle bundle = new Bundle();
MyFragment fragment = new MyFragment();
bundle.putParcelableArray(key, MyParcelableArray);
fragment.setArguments(bundle);
When debugged, I found that MyParcelableArray is not null but bundle mParcelledData is null. Thus, it is throwing a null pointer error.
Why is this happening?
I'm retrieving code in the fragments onCreateView as below.
Bundle bundle = getArguments();
Parcelable[] parcelables = bundle.getParcelableArray(MainActivity.key);
getting null pointer in the above line.
While opening a fragment use below code
Bundle bundle= new Bundle();
bundle.putSerializable("data", MyParcelableArray);
ListFrag newFragment = new ListFrag ();
newFragment.setArguments(bundle);
While obtaining that bundle data in fragment use below code
Bundle b = getArguments();
ArrayList<collection> yourArrayList = (ArrayList<collection>) b.getSerializable("data");
I want to receive data from an Activity to a Fragment.
In an Activity is easy:
Bundle b = getIntent().getExtras();
String flag = b.getString("flag");
Ok, for me, doesn't work
String flag = getIntent().getExtras().getString("flag");
Neither
String flag = getActivity().getIntent().getExtras().getString("flag");
Or.
Bundle b = getIntent().getExtras();
The error: "Unreachable code"
Any idea?
You can view that on Fragment documentation.
Create a newInstance funcion in your fragment to initialize the fragment and add data with setArguments, passing a Bundle.
public static DetailsFragment newInstance(int index) {
DetailsFragment f = new DetailsFragment();
// Supply index input as an argument.
Bundle args = new Bundle();
args.putInt("index", index);
f.setArguments(args);
return f;
}
Then get the arguments using:
Bundle args = getArguments();
int index = args.getInt("index", 0);
I currently have this Custom ArrayList:
ArrayList<PlaceDetails> place_list = new ArrayList<PlaceDetails>();
which will be populated during the onCreateView() portion.
I am unsure as of how do I pass this ArrayList in a bundle from this fragment class to another fragment class. Below is the snippet of my codes:
public void Map(View view){
if(hasConnection() == true){
Bundle b = new Bundle();
// how should I be passing the ArrayList in this bundle?
FragmentTransaction ft = getSherlockActivity().getSupportFragmentManager().beginTransaction();
TOnlineMapViewFragment mapfrag = TOnlineMapViewFragment.newInstance(b);
ft.replace(R.id.container, mapfrag).addToBackStack(null).commit();
}
}
So I've created the bundle and I wanted to pass it to the next fragment with the newInstance() method. How should I do this?
Consider implementing Parcelable interface in your classes. Then you would be able to store PlaceDetails in Bundle and pass it to setArguments() method.
I've found a tutorial: http://shri.blog.kraya.co.uk/2010/04/26/android-parcel-data-to-pass-between-activities-using-parcelable-classes/
I haven't testes it but it looks good.
Are you really sure a bundle is really needed?
TOnlineMapViewFragment mapfrag = TOnlineMapViewFragment.newInstance(b);
mapfrag.setPlaceList(place_list)
Should be trivial to create setPlaceList(ArrayList<PlaceDetails> place_list) ...
I have 2 fragments: (1)Frag1 (2)Frag2.
Frag1
bundl = new Bundle();
bundl.putStringArrayList("elist", eList);
Frag2 dv = new Frag2();
dv.setArguments(bundl);
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.the_fragg,dv);
ft.show(getFragmentManager().findFragmentById(R.id.the_fragg));
ft.addToBackStack(null);
ft.commit();
How do I get this data in Frag2?
Just call getArguments() in your Frag2's onCreateView() method:
public class Frag2 extends Fragment {
public View onCreateView(LayoutInflater inflater,
ViewGroup containerObject,
Bundle savedInstanceState){
//here is your arguments
Bundle bundle=getArguments();
//here is your list array
String[] myStrings=bundle.getStringArray("elist");
}
}
EDIT:
Best practice is read and save arguments in onCreate method. It's worse to do it in onCreateView because onCreateView will be called each time when fragment creates view (for example each time when fragment pops from backstack)
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bundle arguments = getArguments();
}
Eg: Add data:-
Bundle bundle = new Bundle();
bundle.putString("latitude", latitude);
bundle.putString("longitude", longitude);
bundle.putString("board_id", board_id);
MapFragment mapFragment = new MapFragment();
mapFragment.setArguments(bundle);
Eg: Get data :-
String latitude = getArguments().getString("latitude")
You have a method called getArguments() that belongs to Fragment class.
in Frag1:
Bundle b = new Bundle();
b.putStringArray("arrayname that use to retrive in frag2",StringArrayObject);
Frag2.setArguments(b);
in Frag2:
Bundle b = getArguments();
String[] stringArray = b.getStringArray("arrayname that passed in frag1");
It's that simple.
Instantiating the Fragment the correct way!
getArguments() setArguments() methods seem very useful when it comes
to instantiating a Fragment using a static method.
ie Myfragment.createInstance(String msg)
How to do it?
Fragment code
public MyFragment extends Fragment {
private String displayMsg;
private TextView text;
public static MyFragment createInstance(String displayMsg)
{
MyFragment fragment = new MyFragment();
Bundle args = new Bundle();
args.setString("KEY",displayMsg);
fragment.setArguments(args); //set
return fragment;
}
#Override
public void onCreate(Bundle bundle)
{
displayMsg = getArguments().getString("KEY"): // get
}
#Override
public View onCreateView(LayoutInlater inflater, ViewGroup parent, Bundle bundle){
View view = inflater.inflate(R.id.placeholder,parent,false);
text = (TextView)view.findViewById(R.id.myTextView);
text.setText(displayMsg) // show msg
returm view;
}
}
Let's say you want to pass a String while creating an Instance. This
is how you will do it.
MyFragment.createInstance("This String will be shown in textView");
Read More
1) Why Myfragment.getInstance(String msg) is preferred over new MyFragment(String msg)?
2) Sample code on Fragments
for those like me who are looking to send objects other than primitives,
since you can't create a parameterized constructor in your fragment, just add a setter accessor in your fragment, this always works for me.
If you are using navigation components and navigation graph create a bundle like this
val bundle = bundleOf(KEY to VALUE) // or whatever you would like to create the bundle
then when navigating to the other fragment use this:
findNavController().navigate(
R.id.action_navigate_from_frag1_to_frag2,
bundle
)
and when you land the destination fragment u can access that bundle using
Bundle b = getArguments()// in Java
or
val b = arguments// in kotlin