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

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        }

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;        private 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