How to pass custom object in Bundle?

One way is to have your custom object implement the Parcelable interface and use Bundle.putParcelable/Bundle.getParcelable

Since using Parsable is designed for high performance IPC transport as mentioned in some of the comments, I tried using a different approach.

My approach uses GSON library by google.

Example

public class Person{
    private String name;
    private int age;
    // Getter and Setters omitted
}

You can have a method in utility class that returns Gson instance, this is for the sake of clean code and organisation. I will use GsonBuilder incase someone what to register custom adapter.

public class Utils {
    private static Gson gson;
    
    public static Gson getGsonParser() {
        if(null == gson) {
            GsonBuilder builder = new GsonBuilder();
            gson = builder.create();
        }
        return gson;
    }
}

Moment of truth!

PUT

Bundle args = new Bundle();
String personJsonString = Utils.getGsonParser().toJson(person);
args.putString(PERSON_KEY, personJsonString);

GET

Bundle args = getArguments();
String personJsonString = args.getString(PERSON_KEY);
Person person= Utils.getGsonParser().fromJson(personJsonString, Person.class);

Currently I don't know the performance limitation of this approach. But it works just fine

Model Class

package com.sam.bundleobjectpass;

import java.io.Serializable;

/**
 * Created by Samir on 31.8.2016.
 */
public class Model implements Serializable {
    private String name;
    private String surName;
    private int age;

    public Model(String name, String surName, int age) {
        this.name = name;
        this.surName = surName;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    
    public String getSurName() {
        return surName;
    }


    public int getAge() {
        return age;
    }


}

MainActivity

public class MainActivity extends AppCompatActivity {

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


        Model model = new Model("Sam", "Sami",32);
        
        Intent i = new Intent(MainActivity.this, ReceiverActivity.class);
        i.putExtra("Editing", model); // sending our object. In Kotlin is the same
        startActivity(i);

    }
}

ReceiverActivity

public class ReceiverActivity extends Activity {

    TextView txt_name;
    TextView txt_surname;
    TextView txt_age;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second);

        txt_name = (TextView)findViewById(R.id.txt_name);
        txt_surname = (TextView)findViewById(R.id.txt_surname);
        txt_age = (TextView)findViewById(R.id.txt_age);
        // receiving our object
        Model model = (Model) getIntent().getSerializableExtra("Editing");

        txt_name.setText(model.getName());
        txt_surname.setText(model.getSurName());
        txt_age.setText(""+model.getAge());


    }
}

// Kotlin

val model: ProgramModel? = intent.getSerializableExtra("Editing") as ProgramModel?
        model?.let { // means if not null or empty
            txt_act_daily_topic.text = it.title
        }