BackHandledFragment.java

package com.trainerworkout.trainee.helper;

import android.app.Fragment;
import android.os.Bundle;

public abstract class BackHandledFragment extends Fragment {

	protected BackHandlerInterface backHandlerInterface;    
	public abstract String getTagText();
	public abstract boolean onBackPressed();

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		if(!(getActivity()  instanceof BackHandlerInterface)) {
			throw new ClassCastException("Hosting activity must implement BackHandlerInterface");
		} else {
			backHandlerInterface = (BackHandlerInterface) getActivity();
		}
	}

	@Override
	public void onStart() {
		super.onStart();

		// Mark this fragment as the selected Fragment.
		backHandlerInterface.setSelectedFragment(this);
	}

	public interface BackHandlerInterface {
		public void setSelectedFragment(BackHandledFragment backHandledFragment);
	}
}