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 {         


        

Answer 1

You can also 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());

Answer 2

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");
}

Answer 3

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.

Answer 4

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.

Answer 5

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");

Answer 6

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
        )