Question

What is the correct way of calling a fragment method from another class?

I have a class ‘ParseCommands.java’ as such:

public class ParseCommands {

   public static Context context;

   < call to FragmentSettings.doStuff() >

}

I would like to call the method doStuff() in my Fragment:

public class FragmentSettings extends PreferenceFragment {

private static Activity a;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState); 
}

public void doStuff(String message) {
    Toast.makeText(a, message, Toast.LENGTH_SHORT).show();
}

}

I apply my fragments via tabs so I don’t use the fragment manager to set them up, however I’ve tried the following to try to call the method but it doesn’t seem to work:

Activity act = (Activity) context;
FragmentManager fm = act.getFragmentManager();
FragmentSettings fs = (FragmentSettings) m.findFragmentById(R.xml.fragment_settings);
fs.doStuff("it actually worked!");

and I’ve tried declaring doStuff as static and calling it like:

FragmentSettings.doStuff

Both methods don’t seem to work…

What is the correct way of doing this?

Answer 1

Since you have a context object in the ParseCommands class you can use the LocalBroadCastManager to send a message to your Fragment. Your fragment will have to have a BroadcastReceiver implementation and from the onReceive method you can call the doStuff method.

For an implementation check out: how to use LocalBroadcastManager?