How to pass an object from one activity to another on Android

Question

I am trying to work on sending an object of my customer class from one Activity and display it in another Activity.

The code for t

Answer 1

It is impossible to serialize any type of object. For Example you can not serialize delegate methods or interfaces that carry code instead of data. So I have written a 'Box' class you can use to pass any type of data without Serialization.

1- for putting Data to Intent Use:

Intent I = new Intent(this, YourActivity.class);
CustomClass Date = new CustomClass();
Box.Add(I, "Name", Data);

2- for retrieving Data from Intent:

CustomClass Data = Box.Get(getIntent(), "Name");

3- for removing data after use, add this method to your activity:

@Override
protected void onDestroy() {
    Box.Remove(getIntent());
    super.onDestroy();
}

4- and add this code to your project:

package ir.namirasoft.Utility;

import android.content.Intent;

import java.util.HashMap;
import java.util.Vector;

public class Box {
    // Number
    private static int Number = 1;

    public static int NextNumber() {
        return Number++;
    }

    //
    private static String _Intent_Identifier = "_Intent_Identifier";
    private static HashMap> DeleteList = new HashMap>();
    private static HashMap> ObjectList = new HashMap>();

    public static int GetIntent_Identifier(Intent I) {
        int Intent_Identifier = I.getIntExtra(_Intent_Identifier, 0);
        if (Intent_Identifier == 0)
            I.putExtra(_Intent_Identifier, Intent_Identifier = NextNumber());
        return Intent_Identifier;
    }

    public static void Add(Intent I, String Name, Object O) {
        int Intent_Identifier = GetIntent_Identifier(I);
        synchronized (ObjectList) {
            if (!ObjectList.containsKey(Intent_Identifier))
                ObjectList.put(Intent_Identifier, new HashMap());
            ObjectList.get(Intent_Identifier).put(Name, O);
        }
    }

    public static  T Get(Intent I, String Name) {
        int Intent_Identifier = GetIntent_Identifier(I);
        synchronized (DeleteList) {
            DeleteList.remove(Intent_Identifier);
        }
        return (T) ObjectList.get(Intent_Identifier).get(Name);
    }

    public static void Remove(final Intent I) {
        final int Intent_Identifier = GetIntent_Identifier(I);
        final int ThreadID = NextNumber();
        synchronized (DeleteList) {
            if (!DeleteList.containsKey(Intent_Identifier))
                DeleteList.put(Intent_Identifier, new Vector());
            DeleteList.get(Intent_Identifier).add(ThreadID);
        }
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Thread.sleep(60 * 1000);
                } catch (InterruptedException e) {
                }
                synchronized (DeleteList) {
                    if (DeleteList.containsKey(Intent_Identifier))
                        if (DeleteList.get(Intent_Identifier).contains(ThreadID))
                            synchronized (ObjectList) {
                                ObjectList.remove(Intent_Identifier);
                            }
                }
            }
        }).start();
    }
}

** Box class is Thread-Safe.