Pass list of objects from one activity to other activity in android

Question

I want to pass a list of objects from one activity from another activity. I have one class SharedBooking Below:

public class SharedBooking {
  public int account_id;
  public Double betrag;
  public Double betrag_effected;
  public int taxType;
  public int tax;
  public String postingText;
}

Code from Calling activity:

public List<SharedBooking> SharedBookingList = new ArrayList<SharedBooking>();

public void goDivision(Context context, Double betrag, List<SharedBooking> bookingList) {
  final Intent intent = new Intent(context, Division.class);    
  intent.putExtra(Constants.BETRAG, betrag);        
  intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);  
  context.startActivity(intent);        
}

COde on called activity:

Bundle extras = getIntent().getExtras();
if (extras != null) {
  amount = extras.getDouble(Constants.BETRAG,0);
}

How can I send the list of SharedBooking from one activity and receive that on other activity?

Please suggest me any usable link or sample code.

Ruzin · Answer 1 · 2020-11-19T13:09:30.967

109

First, make the class of the list implement Serializable.

public class MyObject implements Serializable{}

Then you can just cast the list to (Serializable). Like so:

List<MyObject> list = new ArrayList<>();
myIntent.putExtra("LIST", (Serializable) list);

And to retrieve the list you do:

Intent i = getIntent();
list = (List<MyObject>) i.getSerializableExtra("LIST");

That's it.

edited Nov 19 '20 at 13:09

answered Aug 12 '15 at 17:53

Ruzin

1,645
2
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3

Best way. Saved much time by not implementing Parcelable :) Ty! – Phate P Aug 05 '16 at 22:03
3

Error occurred "Parcelable encountered IOException writing serializable object in startActivity" – user3315464 May 19 '20 at 08:18
1

Best answer. Thanks – Roberto Rodriguez Jun 03 '20 at 13:24

score 53 · Accepted Answer · answered Aug 23 '12 at 13:39

Use parcelable. Here is how you will do it:

public class SharedBooking implements Parcelable{

    public int account_id;
    public Double betrag;
    public Double betrag_effected;
    public int taxType;
    public int tax;
    public String postingText;

    public SharedBooking() {
        account_id = 0;
        betrag = 0.0;
        betrag_effected = 0.0;
        taxType = 0;
        tax = 0;
        postingText = "";
    }

    public SharedBooking(Parcel in) {
        account_id = in.readInt();
        betrag = in.readDouble();
        betrag_effected = in.readDouble();
        taxType = in.readInt();
        tax = in.readInt();
        postingText = in.readString();
    }

    public int getAccount_id() {
        return account_id;
    }
    public void setAccount_id(int account_id) {
        this.account_id = account_id;
    }
    public Double getBetrag() {
        return betrag;
    }
    public void setBetrag(Double betrag) {
        this.betrag = betrag;
    }
    public Double getBetrag_effected() {
        return betrag_effected;
    }
    public void setBetrag_effected(Double betrag_effected) {
        this.betrag_effected = betrag_effected;
    }
    public int getTaxType() {
        return taxType;
    }
    public void setTaxType(int taxType) {
        this.taxType = taxType;
    }
    public int getTax() {
        return tax;
    }
    public void setTax(int tax) {
        this.tax = tax;
    }
    public String getPostingText() {
        return postingText;
    }
    public void setPostingText(String postingText) {
        this.postingText = postingText;
    }
    public int describeContents() {
        // TODO Auto-generated method stub
        return 0;
    }
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(account_id);
        dest.writeDouble(betrag);
        dest.writeDouble(betrag_effected);
        dest.writeInt(taxType);
        dest.writeInt(tax);
        dest.writeString(postingText);

    }

    public static final Parcelable.Creator<SharedBooking> CREATOR = new Parcelable.Creator<SharedBooking>()
    {
        public SharedBooking createFromParcel(Parcel in)
        {
            return new SharedBooking(in);
        }
        public SharedBooking[] newArray(int size)
        {
            return new SharedBooking[size];
        }
    };

}

Passing the data:

Intent intent = new Intent(getApplicationContext(),YourActivity.class);
Bundle bundle = new Bundle();
bundle.putParcelable("data", sharedBookingObject);
intent.putExtras(bundle);
startActivity(intent);

Retrieving the data:

Bundle bundle = getIntent().getExtras();
sharedBookingObject = bundle.getParcelable("data");

Thanks , good answer , i have modified my code but i need to pass list of sharedBooking class , not a single objects , then please explain me how i pass list of object ? — Sushant Bhatnagar, Aug 23 '12 at 13:46
you can use bundle.putParcelableArrayList(key, value) to set the and bundle.getParcelableArrayList(key) to get the list. — Vineet Shukla, Aug 23 '12 at 13:52
@VineetShukla in the line: bundle.putParcelable("data", sharedBookingObject); what is sharedBookingObject ?? one object or a list of objects ????? — rainman, Sep 03 '16 at 23:43

Shahin ShamS · Answer 3 · 2015-01-27T15:25:57.653

Parcelable object class

    public class Student implements Parcelable {

        int id;
        String name;

        public Student(int id, String name) {
            this.id = id;
            this.name = name;

        }

        public int getId() {
            return id;
        }

        public String getName() {
            return name;
        }


        @Override
        public int describeContents() {
            // TODO Auto-generated method stub
            return 0;
        }

        @Override
        public void writeToParcel(Parcel dest, int arg1) {
            // TODO Auto-generated method stub
            dest.writeInt(id);
            dest.writeString(name);
        }

        public Student(Parcel in) {
            id = in.readInt();
            name = in.readString();
        }

        public static final Parcelable.Creator<Student> CREATOR = new Parcelable.Creator<Student>() {
            public Student createFromParcel(Parcel in) {
                return new Student(in);
            }

            public Student[] newArray(int size) {
                return new Student[size];
            }
        };
    }

And the list

ArrayList<Student> arraylist = new ArrayList<Student>();

Code from Calling activity

Intent intent = new Intent(this, SecondActivity.class);
Bundle bundle = new Bundle();
bundle.putParcelableArrayList("mylist", arraylist);
intent.putExtras(bundle);       
this.startActivity(intent);

Code on called activity

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);   

    Bundle bundle = getIntent().getExtras();
    ArrayList<Student> arraylist = bundle.getParcelableArrayList("mylist");
}

score 2 · Answer 4 · edited Jun 09 '20 at 14:44

2

You may want to implement the Parcelable Interface in your SharedBooking class and add them to the Intent i.e. with the putParcelableArrayListExtra Method. Check the documentation.

edited Jun 09 '20 at 14:44

cyborg86pl

2,597
2
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answered Aug 23 '12 at 13:33

Hans Hohenfeld

1,729
11
14

1

i have modified the class :- public class SharedBooking implements Parcelable and implement its unimplement methods , but i send this using intent.putParcelableArrayListExtra(Constants.BOOKING_LIST, bookingList); where bookingList is ArrayList extends Parcelable> . But how i declare this list in any activity and how i add an object in this activity . – Sushant Bhatnagar Aug 23 '12 at 13:39

Oush · Answer 5 · 2022-06-27T09:15:45.730

2

A simpler way would be to convert the list to a String using Gson, then pass it like so:

String yourListAsString = new Gson().toJson(yourList);
bundle.putString("data",yourListAsString);

Then retrieve it back using your class as the type:

List<YourList> listName = new Gson().fromJson("data", new TypeToken<List<YourList>>(){}.getType());

edited Jun 27 '22 at 09:15

answered Jul 14 '20 at 08:00

Oush

3,090
23
22

score 0 · Answer 6 · answered Jun 09 '20 at 16:48

0

there are 2 ways to send an arraylist of objects or an object from one activity to another:

answered Jun 09 '20 at 16:48

Muneeb Ahmed

1
5

score 0 · Answer 7 · answered Oct 02 '20 at 14:14

If there is someone who is looking for answer this is how i implemented it using Kotlin.

Parcelable object class

data class CollectedMilk(
    @SerializedName("id")
    var id: Int,
    @SerializedName("igicuba")
    var igicuba: Int,
    @SerializedName("collector")
    var collector: String?,
    @SerializedName("collected")
    var collected: Int,
    @SerializedName("accepted")
    var accepted: Int,
    @SerializedName("standard")
    var standard: String?,
    @SerializedName("created_at")
    var created_at: String?,
    @SerializedName("updated_at")
    var updated_at: String?,
): Parcelable {

    constructor(parcel: Parcel) : this(
        parcel.readInt(),
        parcel.readInt(),
        parcel.readString(),
        parcel.readInt(),
        parcel.readInt(),
        parcel.readString(),
        parcel.readString(),
        parcel.readString()
    )

    override fun describeContents(): Int {
        return 0
    }

    override fun writeToParcel(parcel: Parcel?, int: Int) {
        parcel?.writeInt(id)
        parcel?.writeInt(igicuba)
        parcel?.writeString(collector)
        parcel?.writeInt(collected)
        parcel?.writeInt(accepted)
        parcel?.writeString(standard)
        parcel?.writeString(created_at)
        parcel?.writeString(updated_at)
    }

    companion object CREATOR : Parcelable.Creator<CollectedMilk> {
        override fun createFromParcel(parcel: Parcel): CollectedMilk {
            return CollectedMilk(parcel)
        }

        override fun newArray(size: Int): Array<CollectedMilk?> {
            return arrayOfNulls(size)
        }
    }
}

Then in Fragment

collectedMilkAdapter.onItemClick = { collectedMilk ->
            Toast.makeText(
                MccApp.applicationContext(),
                "Collector: " + collectedMilk.collector,
                Toast.LENGTH_LONG
            ).show()

            val intent = Intent(MccApp.applicationContext(), CollectedMilkActivity::class.java)
            val bundle: Bundle = Bundle()

            bundle.putParcelableArrayList("collectedMilk", collectedMilkArrayList)
            intent.putExtras(bundle)

            activity?.startActivity(intent)
        }

Then on another Activity my Detail Activity

Global Variable

private lateinit var collectedMilk: ArrayList<CollectedMilk>

In Function or OnCreate Activity

val bundle = intent.extras
        collectedMilk = (bundle?.getParcelableArrayList<CollectedMilk>("collectedMilk") as ArrayList<CollectedMilk>)

        Toast(this).showCustomToast(
            this,
            ""+collectedMilk,
            dark
        )

score 0 · Answer 8 · answered Dec 15 '20 at 15:31

Another alternative will be the use of Gson.

copy this extension to your code:

// will write a list of objects to intent
fun Intent.putExtra(name: String, objs: List<*>) = putExtra(name, Gson().toJson(objs))

// will read a list of objects from intent
inline fun <reified T> Intent.getObjListExtra(name: String): List<T>? {
    val lstStr = getStringExtra(name) ?: return null
    val lst = Gson().fromJson<List<T>>(lstStr, object: ParameterizedType {
        override fun getActualTypeArguments(): Array<Type> = arrayOf(T::class.java)
        override fun getRawType(): Type = List::class.java
        override fun getOwnerType(): Type = T::class.java
    })
    return lst
}

and use them:

Activity 1:

startActivity(Intent(this, Activity2::class.java).also {
   val people = listOf(Person("Moishe"), Person("Albert"), Person("Lezly"))
   it.putExtra("people", people)
 })

Activity 2:

val people = intent.getObjExtra<Person>("Person")

This solution aim to use Gson as the parser

score 0 · Answer 9 · answered Aug 29 '21 at 08:07

Kotlin