how to pass a user defined object from one activity to another

Question

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How to pass object from one activity to another in Android

I want to pass a user defined class object from one Activity to another. I know the way we pass a String to other Activity:

Intent in=new Intent(LoginActivity.this,WebserviceClient.class);
in.putExtra("res", "abc");
startActivityForResult(in, 0);

and how to extract it on the other side:

Intent i = getIntent();
res = i.getStringExtra("res");

But I want to know how to do this for both sides for a user defined object?

Parcelable is the answer, see the discussion in this thread: http://stackoverflow.com/questions/12363503/passing-a-custom-object-from-one-activity-to-another-parcelable-vs-bundle — Ziteng Chen, Oct 22 '12 at 06:30
I would suggest you to explore Stackoverflow before asking such repeated Questions/Answers. — Paresh Mayani, Oct 22 '12 at 06:39
Check: [**How to pass object to an activity?**](http://stackoverflow.com/questions/8686938/how-to-pass-object-to-an-activity), — Paresh Mayani, Oct 22 '12 at 06:40

score 1 · Accepted Answer · answered Oct 22 '12 at 06:31

1

You need to implement your class to Parcelable interface. This guide may help Pass complex object data structure to Intent

answered Oct 22 '12 at 06:31

Pete Houston

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score 1 · Answer 2 · answered Oct 22 '12 at 06:31

1

Let your class implement Parcelable and pass it as intent extra.

answered Oct 22 '12 at 06:31

Bondax

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mukesh · Answer 3 · 2012-10-22T06:45:49.767

1

implements Serializable that class which class of object you want send

  Intent in=new Intent(LoginActivity.this,WebserviceClient.class);
                    in.putExtra("res",objectOfClass);
                    startActivityForResult(in, 0);

to extract other side

 Bundle extraData = getIntent().getExtras();
        if (extraData != null) {
            objectOfClass = (Classname) extraData
                    .getSerializable("res");
        }

edited Oct 22 '12 at 06:45

answered Oct 22 '12 at 06:31

mukesh

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How your code differs from the one that he placed in the question? He is asking about passing a custom object not just a String – Marcin S. Oct 22 '12 at 06:34
check my edited answer.its may satisfy you. – mukesh Oct 22 '12 at 06:48
On Android, Parcelable is faster than Serializable, which is a generic Java construct, while Parcelable is an Android thing. – Bondax Oct 22 '12 at 07:00

Parker · Answer 4 · 2012-10-22T10:07:51.353

you can use my class, to pass object to another activity you need to create parcelable object,but make sure your bean class implements parcel here CategoryBean is my bean class

/**
         * A method to create pacelable{@link Parcelable} object
         * @param album
         * @return
         */
        public  ParcelHashMap parseObject(CategoryBean mCategoryBean){
            ParcelHashMap p = new ParcelHashMap();
            p.put("CategoryBean", mCategoryBean);
            return p;
        }

and pass it with intent, from Activity1

Intent in=new Intent(Activity1.this,Activity2.class);
in.putExtra("myCatObject", parseObject(selectedCategoryObject));
startActivity(in);

and in secondActivity just pass that parcelabel object to get real object like below

    /**
     * To get parsed object from Parcelable object, you can use int,string or any object
     * @param parsedObje Parcelable
     * @return PhotosBean Object
     */
    public  CategoryBean parseObject(Parcelable parsedObje){
        return (CategoryBean)((ParcelHashMap)parsedObje).get("CategoryBean");
    }

A class for parcel

package com.ixorian; import java.util.HashMap;

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

public class ParcelHashMap implements Parcelable {
    private HashMap<String,Object> map;

    public ParcelHashMap() {
        map = new HashMap<String,Object> ();
    }

    public ParcelHashMap(Parcel in) {
        map = new HashMap<String,Object> ();
        readFromParcel(in);
    }

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

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

//  @Override
    public int describeContents() {
        return 0;
    }

//  @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(map.size());
//      for (String s: map.keySet().toArray(new String[0])) {
//          dest.writeString(s);
//          dest.writeString((String) map.get(s));
//      }

         for (HashMap.Entry<String, Object> entry : map.entrySet()) {  
             dest.writeString(entry.getKey());  
             dest.writeValue(entry.getValue());  
             }  
    }

    public void readFromParcel(Parcel in) {
        int count = in.readInt();
        for (int i = 0; i < count; i++) {
            map.put(in.readString(), in.readValue(ParcelHashMap.class.getClassLoader()));
        }
    }

    public Object get(String key) {
        return (Object) map.get(key);
    }

    public void put(String key, Object value) {
        map.put(key, value);
    }
}

score 0 · Answer 5 · answered Oct 22 '12 at 09:55

A simple approach that i follow to pass custom Objects between Andriod Activities ,is by defining a Singleton class in my project, that contains all the objects & variables that i need to pass around between Activities ,Suppose you want to pass a custom object from Activity A-->B , you define a Singleton class containing the object template you want to pass, you simply call a setter method in Activity A , and a getter in Activity B.

how to pass a user defined object from one activity to another

5 Answers5