Android Base Classes

BaseFragment.java

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

import butterknife.ButterKnife;
import butterknife.Unbinder;

public abstract class BaseFragment extends Fragment {

    private Unbinder unbinder;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                       Bundle savedInstanceState) {

        View view = inflater.inflate(getFragmentLayout(), container, false);

        unbinder = ButterKnife.bind(this, view);

        onBindView(view, savedInstanceState);

        return view;

    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        
        unbinder.unbind();
    }

    public Unbinder getUnbinder() {
        return unbinder;
    }

    abstract protected int getFragmentLayout();

    abstract protected void onBindView(View view, Bundle savedInstanceState);

}

BaseRecyclerViewAdapter.java

import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import BaseRecyclerViewHolder;

import java.util.List;

public abstract class BaseAdapter<E, T extends BaseRecyclerViewHolder> extends RecyclerView.Adapter<T> {

    private List<E> data;

    public BaseAdapter(List<E> data) {
        this.data = data;
    }

    @Override
    public T onCreateViewHolder(ViewGroup parent, int viewType) {

        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(getLayout(), parent, false);

        return getViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(T holder, int position) {

        holder.bindData(data.get(position));

    }

    @Override
    public int getItemCount() {
        return data.size();
    }

    abstract protected T getViewHolder(View view);

    abstract protected int getLayout();
}

BaseRecyclerViewHolder.java

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.View;

public abstract class BaseViewHolder<T> extends RecyclerView.ViewHolder{

    private final View view;

    public BaseViewHolder(View view) {
        super(view);
        this.view = view;
    }

    abstract public void bindData(final T data);

    protected @NonNull View view() {
        return view;
    }

    protected @NonNull Context context() {
        return view.getContext();
    }
}