Retrieving recipe step index

Activity_RecipeDetail.java

package com.example.android.bakingapp;

import android.content.Context;
import android.content.SharedPreferences;
import android.support.v4.app.FragmentManager;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.Toast;

import com.google.gson.Gson;

public class Activity_RecipeDetail extends AppCompatActivity implements OnStepClickListener{

    Recipe recipe;
    private boolean isTwoPane;

    static String SHARED_PREFERENCES_NAME="com.example.android.bakingapp";
    static String RECIPE_NAME_KEY="recipeName";
    static String INGREDIENTS_KEY="recipeIngredients";

    private int mClickedItemIndex = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recipe_detail);

        recipe = (Recipe) getIntent().getParcelableExtra("recipe");
        setTitle(recipe.getName());

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        FragmentManager fm = getSupportFragmentManager();

        if(savedInstanceState != null){
            mClickedItemIndex = savedInstanceState.getInt("mClickedItemIndex");
        }

        if(findViewById(R.id.separatorView) !=null){
            isTwoPane=true;

            Bundle bundle1 = new Bundle();
            bundle1.putInt("index",mClickedItemIndex);
            bundle1.putString("step_title",recipe.getSteps().get(mClickedItemIndex).getShortDescription());
            bundle1.putBoolean("isTwoPane",isTwoPane);
            bundle1.putParcelableArrayList("steps",recipe.getSteps());

            Fragment_StepDescription stepDescriptionFrag = new Fragment_StepDescription();
            stepDescriptionFrag.setArguments(bundle1);

            fm.beginTransaction()
                    .add(R.id.recipe_step_frame, stepDescriptionFrag)
                    .commit();
        }
        else{
            isTwoPane=false;
        }

        Bundle bundle2 = new Bundle();
        bundle2.putParcelable("recipe", getIntent().getParcelableExtra("recipe"));
        bundle2.putBoolean("isTwoPane",isTwoPane);
        bundle2.putInt("mClickedItemIndex", mClickedItemIndex);

        Fragment_RecipeDetail recipeDetail = new Fragment_RecipeDetail();
        recipeDetail.setArguments(bundle2);

        fm.beginTransaction()
                .add(R.id.recipe_detail_frame, recipeDetail)
                .commit();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu_recipe_detail, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            // Respond to the action bar's Up/Home button
            case android.R.id.home:
                finish();
                return true;
            case R.id.addToWidget:

                SharedPreferences preferences = this.getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE);

                Gson gson = new Gson();
                String json = gson.toJson(recipe.getIngredients());

                preferences.edit().putString(RECIPE_NAME_KEY, recipe.getName()).apply();
                preferences.edit().putString(INGREDIENTS_KEY, json).apply();

                BakingAppWidgetProvider.sendRefreshBroadcast(this);

                Toast.makeText(this, "Added to Widget", Toast.LENGTH_SHORT).show();

                return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onClick(int index) {
        mClickedItemIndex = index;
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt("mClickedItemIndex", mClickedItemIndex);
    }
}

Adapter_RecipeStep.java

package com.example.android.bakingapp;

import android.support.constraint.ConstraintLayout;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.List;
import butterknife.BindView;
import butterknife.ButterKnife;


public class Adapter_RecipeStep extends RecyclerView.Adapter<Adapter_RecipeStep.MyViewHolder> {

    private List<RecipeStep> steps;

    final private ListItemClickListener mOnClickListener;

    int mClickedItemIndex=0;
    boolean isTwoPane;

    public interface ListItemClickListener{
        void onListItemClick(int clickedItemIndex);
    }

    public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

        @BindView(R.id.recipeSteps_layout)
        ConstraintLayout layout;

        @BindView(R.id.step_name_lvrow_tv)
        TextView name_tv;

        public MyViewHolder(View view) {
            super(view);
            ButterKnife.bind(this, view);
            view.setOnClickListener(this);
        }

        @Override
        public void onClick(View view) {
            int clickedPosition=getAdapterPosition();
            mClickedItemIndex=clickedPosition;
            notifyDataSetChanged();
            mOnClickListener.onListItemClick(clickedPosition);
        }
    }

    public Adapter_RecipeStep(List<RecipeStep> steps,boolean isTwoPane,ListItemClickListener listener, int clickedItemIndex) {
        this.steps = steps;
        this.isTwoPane=isTwoPane;
        mOnClickListener=listener;
        mClickedItemIndex = clickedItemIndex;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.recipe_steps_list_row, parent, false);

        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        RecipeStep step = steps.get(position);

        if(position==0){
            holder.name_tv.setGravity(View.TEXT_ALIGNMENT_CENTER);
            holder.name_tv.setText(step.getShortDescription());
        }
        else{
            holder.name_tv.setText("Step #"+Integer.toString(position)+"  "+step.getShortDescription());
        }

        if(isTwoPane) {
            if (mClickedItemIndex == position) {
                holder.layout.setBackgroundResource(R.color.listRowSelected);
            } else {
                holder.layout.setBackgroundResource(R.color.listRow);
            }
        }
    }

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

Fragment_RecipeDetail.java

package com.example.android.bakingapp;

import android.appwidget.AppWidgetManager;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import java.util.ArrayList;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;


public class Fragment_RecipeDetail extends Fragment implements Adapter_RecipeStep.ListItemClickListener {

    @BindView(R.id.ingredients_rv)
    RecyclerView ingredients_rv;

    @BindView(R.id.steps_rv)
    RecyclerView steps_rv;

    List<Ingredient> ingredients;
    Adapter_Ingredient ingredientAdapter;

    ArrayList<RecipeStep> steps;
    Adapter_RecipeStep stepAdapter;

    boolean isTwoPane;

    int mClickedItemIndex = 0;

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

        View rootView=inflater.inflate(R.layout.fragment_recipe_detail, container, false);

        ButterKnife.bind(this,rootView);

        Recipe recipe = getArguments().getParcelable("recipe");
        isTwoPane = getArguments().getBoolean("isTwoPane");
        mClickedItemIndex = getArguments().getInt("mClickedItemIndex");

        AppWidgetManager appWidgetManager=AppWidgetManager.getInstance(getContext());

        ingredients=recipe.getIngredients();

        ingredientAdapter = new Adapter_Ingredient(ingredients);
        ingredientAdapter.notifyDataSetChanged();

        RecyclerView.LayoutManager mLayoutManager1 = new LinearLayoutManager(getActivity());
        ingredients_rv.setLayoutManager(mLayoutManager1);
        ingredients_rv.setAdapter(ingredientAdapter);

        steps=recipe.getSteps();

        stepAdapter = new Adapter_RecipeStep(steps,isTwoPane,this, mClickedItemIndex);
        stepAdapter.notifyDataSetChanged();

        RecyclerView.LayoutManager mLayoutManager2 = new LinearLayoutManager(getActivity());

        steps_rv.setLayoutManager(mLayoutManager2);
        steps_rv.setAdapter(stepAdapter);

        //when the index > 0, we force the load of the recipe detail
        if(mClickedItemIndex > 0){
            init(mClickedItemIndex);
        }

        return rootView;
    }

    private void init(int clickedItemIndex){
        if(isTwoPane){

            Bundle bundle = new Bundle();
            bundle.putInt("index",clickedItemIndex);

            if(clickedItemIndex==0){
                bundle.putString("step_title",steps.get(clickedItemIndex).getShortDescription());
            }
            else{
                bundle.putString("step_title","Step #"+Integer.toString(clickedItemIndex));
            }

            bundle.putBoolean("isTwoPane",isTwoPane);
            bundle.putParcelableArrayList("steps",steps);

            Fragment_StepDescription stepDescriptionFrag = new Fragment_StepDescription();
            stepDescriptionFrag.setArguments(bundle);

            getFragmentManager().beginTransaction()
                    .replace(R.id.recipe_step_frame, stepDescriptionFrag)
                    .commit();
        }
        else{
            Intent intent = new Intent(getActivity(), Activity_StepDescription.class);
            intent.putExtra("index",clickedItemIndex);

            if(clickedItemIndex==0){
                intent.putExtra("step_title",steps.get(clickedItemIndex).getShortDescription());
            }
            else{
                intent.putExtra("step_title","Step #"+Integer.toString(clickedItemIndex));
            }

            intent.putExtra("isTwoPane",isTwoPane);
            intent.putParcelableArrayListExtra("steps",steps);
            startActivity(intent );
        }
    }

    @Override
    public void onListItemClick(int clickedItemIndex){
        mClickedItemIndex = clickedItemIndex;
        init(mClickedItemIndex);
        ((OnStepClickListener) getActivity()).onClick(mClickedItemIndex);
    }
}

OnStepClickListener.java

package com.example.android.bakingapp;

public interface OnStepClickListener {

    void onClick(int index);

}