[Android] I have a question about parcellable.

package com.example.junseo.test03;

//List representation activity

import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;

/**
 * * Created by Junseo on 2017-06-30.
 */

public class MacroActivity extends AppCompatActivity {
    ListView listview;

    ArrayAdapter<String> adapter;
    TextView tv;

    int Addition = 1;

    ArrayList<macro> storage = new ArrayList<>();
    ArrayList<String> title = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_macro);
        setTitle ("My Commercial Sphere");

        init();
    }
    void init(){
        listview = (ListView)findViewById(R.id.listview);
        tv = (TextView)findViewById(R.id.tv);

        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, title);

        listview.setAdapter(adapter);

        listview.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {
                AlertDialog.Builder dlg = new AlertDialog.Builder(MacroActivity.this);
                final int position = i;
                dlg.setTitle ("delete")
                        .setMessage ("Do you want to delete it?")
                        .setNegativeButton("Cancel", new DialogInterface.OnClickListener()
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {

                            }
                        })
                        .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {
                                title.remove(position);
                                storage.remove(position);
                                adapter.notifyDataSetChanged();
                                tv.setText ("Commercial phrase list" + title.size() + "dog"));
                            }
                        }).show();
                return true;
            }
        });

        //If you clicked List.
        listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                //Intent intent = new Intent(MainActivity.this, Main3Activity.class);

              //  //  intent.putExtra("macro", storage.get(i));

              //  //  startActivity(intent);
            }
        });
    }
    //Go to Macro Correction Activity.
    public void onClick(View v){
        Intent intent = new Intent(this, MacroupActivity.class);

        startActivityForResult(intent, Addition);
    }

    @Override
    //After modifying the commercial district, display the number of commercial districts and import data.
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(requestCode == Addition){
            if(resultCode == RESULT_OK){
                Macro = data.getParcelableExtra("macro"); // Gets the data temporarily stored in macro.java.
                Title.add(r.getName()); // Get the contents of the commercial tool.
                storage.add(r);
                adapter.notifyDataSetChanged();
                tv.setText ("Commercial phrase list" + title.size() + "dog"));
            }
        }
    }
}

package com.example.junseo.test03;
// Edit activity for putting a value in the list.
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;



public class MacroupActivity extends AppCompatActivity {

    EditText etName;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_macroup);
        setTitle ("My Commercial Sphere");

        init();
    }

    void init() {
        etName = (EditText) findViewById(R.id.etname);
    }

    public void onClick(View v) {
        if (v.getId() == R.id.btnCancel) {
            finish();
        } } else if (v.getId() == R.id.btnAdd) {
            Intent intent = new Intent();

            String name = etName.getText().toString(); // Put the input value into the name value.

            Macro temp = new macro(name); // name value is added to the temp value according to the format implemented in macro.java.

            int.putExtra ("macro", temp); // temporarily stored in macro.java for transmission to MacroActivity.
            setResult(RESULT_OK, intent);
            finish();

        }
    }
}

package com.example.junseo.test03;

import android.os.Parcel;
import android.os.Parcelable;

/**
 * * Created by Junseo on 2017-07-03.
 */

public class macro implements Parcelable {

    private String name;

    public macro(String name){
        this.name = name;

    }
    protected macro(Parcel in) {
        name = in.readString();
    }

    public static final Creator<macro> CREATOR = new Creator<macro>() {
        @Override
        public macro createFromParcel(Parcel in) {
            return new macro(in);
        }
        @Override
        public macro[] newArray(int size) {
            return new macro[size];
        }
    };
    @Override
    public int describeContents() {
        return 0;
    }
    @Override
    public void writeToParcel(Parcel parcel, int i) {
        parcel.writeString(name);
    }


    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}