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Create generic/base form class regardless if activity or fragment

I'm trying to create a generic/base form regardless if it is an activity or fragment. To make it simple, a Form can submit so:

activity

fragment

Form

class BaseFormActivity extends AppCompatActivity {

public abstract void submitForm();

@Override
public void setContentView(int layoutResID) {
ConstraintLayout activityBaseForm = (ConstraintLayout) getLayoutInflater().inflate(R.layout.activity_base_form, null);
FrameLayout frameBaseForm = activityBaseForm.findViewById(R.id.frame_base_form);

getLayoutInflater().inflate(layoutResID, frameBaseForm, true);

findViewById(R.id.btn_submit).setOnClickListener(v -> submitForm()) // for the sake of simplicity, there's a button that will trigger submitForm() method

super.setContentView(activityBaseForm);
}
}


Here, I just include some default layout for a form, and a button for submit that triggers the abstract method submitForm(). But, this is only for android activities. How can I make this also available for fragments without writing a BaseFormFragment? I don't want to repeat default behaviors from activity to the fragment and vice versa.

submitForm()

activities

fragments

BaseFormFragment

activity

fragment

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