how to pass string from activity to fragment?

Question

Activity A

 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_ActivityA);

    Bundle b = new Bundle();
    b.putString("mobile", "123456789");
    FragmentA fragmentA = new FragmentA ();
    fragmentA .setArguments(b);}

FragmentA

 @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    View v = inflater.inflate(R.layout.fragment_fragmentA, container, false);

        String txtMobile = getArguments().getString("mobile");
        Log.i("mobile2",txtMobile);
        mobile.setText(txtMobile);}

I have tried above solution but showing error that Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference

Answer 1

Create your fragment like this

public static MyFragment newInstance(String string) {

    Bundle args = new Bundle();
    args.putString("string",string);
    MyFragment fragment = new MyFragment();
    fragment.setArguments(args);
    return fragment;
}

And then in Fragment onCreate use getArguments() for pulling that String. Don't forget to check getArguments() for null.

Answer 2

Try to fetch the argument in onCreate method of fragment with default value constructor:

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    String txtMobile = getArguments().getString("mobile", "");
}

and make sure you commit the fragment transaction after settting the arguments in fragment. :)

Answer 3

First check that your argument is not null. For example @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

View v = inflater.inflate(R.layout.fragment_fragmentA, container, false);

if(getArguments()!=null){

    String txtMobile = getArguments().getString("mobile");
    Log.i("mobile2",txtMobile);
    mobile.setText(txtMobile);

} }

Answer 4

try this:

  @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        if (savedInstanceState != null){            
            String txtMobile = savedInstanceState.getString("mobile");                
        }
    }

Answer 5

May be It's about the way you are adding fragment to the class:

    Bundle b = new Bundle();
    b.putString("mobile", "123456789");
    FragmentA fragmentA = new FragmentA ();
    fragmentA .setArguments(b);

    fm.beginTransaction()
    .replace(placeholder, new FragmentA(), tabId)
    .commit();

can you provide more data about how did you add it ?

Answer 6

you can use inteface to pass data from activity to fragment

In your activity

public interface FragmentRefreshListener {
    void onRefresh(String mydata);
}

public FragmentRefreshListener fragmentRefreshListener;

public void setFragmentRefreshListener(FragmentRefreshListener fragmentRefreshListener) {
    this.fragmentRefreshListener = fragmentRefreshListener;
}

public FragmentRefreshListener getFragmentRefreshListener() {
    return fragmentRefreshListener;
}

Then inside your fragment add below code

((MainActivity) getActivity()).setFragmentRefreshListener(new MainActivity.FragmentRefreshListener() {

        @Override
        public void onRefresh(String mydata) {

      // write your logic here

        }
    });

use following in your activity to pass data from activity to fragment

getFragmentRefreshListener().onRefresh("dummy text");