How to handle button clicks using the XML onClick within Fragments

Activity:

Fragment someFragment;
 
//...onCreate etc instantiating your fragments
 
public void myClickMethod(View v) {
  someFragment.myClickMethod(v);
}

Fragment:

public void myClickMethod(View v) {
  switch(v.getId()) {
    // Just like you were doing
}
}

Also we can use,

Interface:

public interface XmlClickable {
  void myClickMethod(View v);
}

Activity:

XmlClickable someFragment;
 
//...onCreate, etc. instantiating your fragments casting to your interface.

public void myClickMethod(View v) {
  someFragment.myClickMethod(v);
}

Fragment:

public class SomeFragment implements XmlClickable {
 
//...onCreateView, etc.
 
@Override
public void myClickMethod(View v) {
  switch(v.getId()){
  // Just like you were doing
}
}

Try this:

    For handling onClick events, Activity and Fragments works by below codes.

public class StartFragment extends Fragment implements OnClickListener{
 
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
      Bundle savedInstanceState) {
 
    View v = inflater.inflate(R.layout.fragment_start, container, false);
 
    Button b = (Button) v.findViewById(R.id.StartButton);
    b.setOnClickListener(this);
    return v;
  }
 
  @Override
  public void onClick(View v) {
    switch (v.getId()) {
    case R.id.StartButton:
 
      ...
 
      break;
    }
  }
}

Simple solution:

     The view is still the activity but not the fragment. By its own the fragments does not have any absolute view by attached to the parent activities view. So the event get over the Activity, not the fragment. Adding a click listener that calls the old event handler during conversions may solve this.

Example:

final Button loginButton = (Button) view.findViewById(R.id.loginButton);
loginButton.setOnClickListener(new OnClickListener() {
  @Override
  public void onClick(final View v) {
    onLoginClicked(v);
  }
});