Call dynamic fragment method from activity

abdfahim Published at Dev

abdfahim

I have different Fragments loaded in my activity dynamically by code below

Fragment fragment = null;
    switch (pos) {
        case 1:
            fragment = new Fragment1();
            break;
        case 2:
            fragment = new Fragment2();
            break;
        default:
            break;
    }
if(fragment != null){
    FragmentManager fm = getFragmentManager();
    fm.beginTransaction().replace(R.id.frg_container, fragment, "frag_"+pos).commit();
    ITEMPOS = pos;
}

Now if I want to call "fragMethod" in one of my fragment, how can I do that? I tried below, but it is not recognizing "fragMethod" unless I put class in front. Now I can't hard code the class as it varies (Fragment1 or Fragment 2).

FragmentManager mn = getFragmentManager();
Fragment ft = mn.findFragmentByTag("frag_"+ITEMPOS);
ft.fragMethod(scanResult.toString());

UPDATE: Thanks to Mike M., I learned to use interface :). Here how it is

Activity Class:

public class navContainer extends Activity {
    public interface IFragment
    {
        public void fragMethod(String arg);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
      super.onActivityResult(requestCode, resultCode, intent);
      IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
      if (scanResult != null) {
          FragmentManager mn = getFragmentManager();
          Fragment ft = mn.findFragmentByTag("frag_"+ITEMPOS);
          ((IFragment) ft).populateFromBarcode(scanResult.toString());
      }

    }
}

Fragment Class:

public class Fragment1 extends Fragment implements IFragment{
    @Override
    public void populateFromBarcode(String isbn){
        System.out.println(isbn);
    }
}

Mike M.

Use an interface.

public interface IFragment
{
    public void fragMethod(String arg);
}

public class Fragment1 implements IFragment {
    public void fragMethod(String arg) {

    }
    ...
}

public class Fragment2 implements IFragment {
    public void fragMethod(String arg) {

    }
    ...     
}
...
...
FragmentManager mn = getFragmentManager();
Fragment ft = mn.findFragmentByTag("frag_"+ITEMPOS);
((IFragment) ft).fragMethod(scanResult.toString());

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