BaseFragment.java

package ua.kpi.ecampus.ui.fragment;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import ua.kpi.ecampus.ui.activity.BaseActivity;

import butterknife.ButterKnife;


/**
 * Base fragment created to be extended by every fragment in this application.
 * This class provides
 * dependency injection configuration, ButterKnife Android library configuration
 * and some methods common to every fragment.
 * <p/>
 * Created by Admin on 02.02.2016.
 */
public abstract class BaseFragment extends Fragment {

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        injectDependencies();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(getFragmentLayout(), container, false);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        injectViews(view);
    }

    /**
     * Every fragment has to inflate a layout in the onCreateView method. We have added this method to
     * avoid duplicate all the inflate code in every fragment. You only have to return the layout to
     * inflate in this method when extends BaseFragment.
     */
    protected abstract int getFragmentLayout();

    /**
     * Replace every field annotated using @Inject annotation with the provided dependency specified
     * inside a Dagger module value.
     */
    private void injectDependencies() {
        ((BaseActivity) getActivity()).inject(this);
    }

    /**
     * Replace every field annotated with ButterKnife annotations like @InjectView with the proper
     * value.
     *
     * @param view to extract each widget injected in the fragment.
     */
    public void injectViews(final View view) {
        ButterKnife.bind(this, view);
    }

}