RecyclerView item click programmatically in Android

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/root_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    android:orientation="vertical"
    android:background="#bde295"
    >
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Click Item No : 1"
        />
    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        />
</LinearLayout>

custom_view.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/linear_layout"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    >
    <TextView
        android:id="@+id/text_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textStyle="bold"
        android:textSize="25sp"
        />
</LinearLayout>

ColorsAdapter.java

public class ColorsAdapter extends RecyclerView.Adapter<ColorsAdapter.ViewHolder>{
    private Context mContext;
    private Activity mActivity;
    private String[] colors;
    public ColorsAdapter(Context context, Activity activity){
        mContext = context;
        mActivity = activity;
        colors = new String[]{"Red","Green","Blue","Yellow","Black"};
    }
    public static class ViewHolder extends RecyclerView.ViewHolder{
        public LinearLayout linear_layout;
        public TextView text_view;
        public ViewHolder(View v){
            super(v);
            text_view = v.findViewById(R.id.text_view);
            linear_layout = v.findViewById(R.id.linear_layout);
        }
    }
    @Override
    public void onBindViewHolder(ViewHolder holder, final int position){
        holder.text_view.setText(""+ (position+1) + ". "+ colors[position]);
        holder.linear_layout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(mContext,"Clicked : " + colors[position],Toast.LENGTH_SHORT).show();
            }
        });
    }
    @Override
    public ColorsAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType){
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.custom_view,parent,false);
        ViewHolder holder = new ViewHolder(v);
        return holder;
    }
    @Override
    public int getItemCount(){
        return colors.length;
    }
}

MainActivity.java

public class MainActivity extends AppCompatActivity {
    private Context mContext;
    private Activity mActivity;
    private LinearLayout mRootLayout;
    private Button mButton;
    private RecyclerView mRecyclerView;
    private RecyclerView.Adapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;
    private int mIndexCount;
    private int mIndex = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mContext = getApplicationContext();
        mActivity = MainActivity.this;
        mButton = findViewById(R.id.btn);
        mRecyclerView = findViewById(R.id.recycler_view);
        mAdapter = new ColorsAdapter(mContext,mActivity);
        mRecyclerView.setAdapter(mAdapter);
        mLayoutManager = new GridLayoutManager(mContext,1);
        mRecyclerView.setLayoutManager(mLayoutManager);
        mIndexCount = mRecyclerView.getAdapter().getItemCount()-1;
        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(mIndex <= mIndexCount){
                    mRecyclerView.findViewHolderForAdapterPosition(mIndex).itemView.performClick();
                    if(mIndex == mIndexCount){
                        mIndex = 0;
                    }else {
                        // For next index
                        mIndex += 1;
                    }
                    mButton.setText("Click Item No : " + (mIndex+1));
                }
            }
        });
    }
}