Android - How to pass HashMap<String,String> between activities?

Question

How to pass the detail HashMap to another Activity?

HashMap<String,String> detail = new HashMap<String, String>();
detail.add("name","paresh");
detail.add("surname","mayani");
detail.add("phone","99999");
......
......

stackoverflow.com/questions/4154744/… this will help you. And in another way make your HashMap as public and static, set its values in caller activity and use its values into called activity. And before adding values to your HashMap, clear its previous values. — Pankaj Kumar
– Pankaj Kumar, Commented Feb 14, 2011 at 12:42
@Tanmay please don't change the OP's code. Add a comment or answer outlining the change instead. (Rejected edit) — Pekka
– Pekka, Commented Feb 14, 2011 at 12:48
@Pekka No problem.I just wanted to make sure the right thing — Tanmay Mandal
– Tanmay Mandal, Commented Feb 14, 2011 at 12:51
Can you prefer to make your hashMap as public static? I can explain it. — Pankaj Kumar
– Pankaj Kumar, Commented Feb 14, 2011 at 12:53

Shashanth · Accepted Answer · 2016-07-05 12:30:07Z

77

This is pretty simple, All Collections objects implement Serializable (sp?) interface which means they can be passed as Extras inside Intent

Use putExtra(String key, Serializable obj) to insert the HashMap and on the other Activity use getIntent().getSerializableExtra(String key), You will need to Cast the return value as a HashMap though.

edited Jul 5, 2016 at 12:30

Shashanth

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answered Feb 14, 2011 at 13:05

st0le

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5 Comments

Yeung Over a year ago

Excause me. What if I can have a HaspMap<String, Object>? Can it be serialize? The value Objects are just int, String or float type. No custom Object type.

Miha_x64 Over a year ago

Keep in mind, that the map will not be serialized. It will be parcelized by internals if possible. And then you will get a HashMap on the other side, despite you've put LinkedHashMap or any other map.

arlomedia Over a year ago

"You will need to Cast the return value" -- that's what I was missing.

temirbek Over a year ago

I'm getting "Unchecked cast" warning

Aba Over a year ago

The "Unchecked cast" warning is basically saying "you're on your own" ;)

Paresh Mayani · Accepted Answer · 2012-06-22 11:16:03Z

67

Solution:

Sender Activity:

HashMap<String, String> hashMap= adapter.getItem(position);
Intent intent = new Intent(SourceActivity.this, DestinationActivity.class);
intent.putExtra("hashMap", hashMap);
startActivity(intent);

Receiver Activity:

Intent intent = getIntent();    
HashMap<String, String> hashMap = (HashMap<String, String>) intent.getSerializableExtra("hashMap");

answered Jun 22, 2012 at 11:16

Paresh Mayani

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3 Comments

Anish Kumar Over a year ago

Hey hi, I am getting parcel error at runtime. java.lang.RuntimeException: Parcel: unable to marshal value I am passing HaspMap<String, JSONArray>

Abubakar Over a year ago

@anish bcz JSONArray is not serializable.

Anish Kumar Over a year ago

Thanks mate, though it is a late reply, appreciated your help. :) @Abubakar

MetaSnarf · Accepted Answer · 2014-07-04 05:26:32Z

4

i used this to pass my HashMap

startActivity(new Intent(currentClass.this,toOpenClass.class).putExtra("hashMapKey", HashMapVariable));

and on the receiving activity write

HashMap<String,String> hm = (HashMap<String,String>) getIntent().getExtras().get("hashMapKey");

cuz i know my hashmap contains string as value.

answered Jul 4, 2014 at 5:26

MetaSnarf

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2 Comments

Paresh Mayani Over a year ago

Are you sure that you are able to get HashMap<String, String> using getExtras.get("key") ?

MetaSnarf Over a year ago

yeah...as long as you passed "HashMap<String,String>" to the receiving activity

MattC · Accepted Answer · 2011-02-14 13:14:50Z

0

An alternative is if the information is something that might be considered "global" to the application, to then use the Application class. You simply extend it and then define your custom class in your manifest using the <application> tag. Use this sparingly, though. The urge to abuse it is high.

answered Feb 14, 2011 at 13:14

MattC

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2 Comments

Paresh Mayani Over a year ago

thanx for the support, and "new" information , but i just need to pass HashMap between two activities i.e. From activity A to activity B

MattC Over a year ago

I figured. Just wanted to offer it as an alternative.

BackStabber · Accepted Answer · 2014-09-30 10:40:41Z

0

Here I am showing sample code for your reference. I just tried this code, it works fine for me. Check this :

MainActivity :

    final HashMap<Integer, String> hashMap = new HashMap<Integer, String>();
    hashMap.put(1, "Hi");

    button.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub              

            Intent intent = new Intent(MainActivity.this, SecondActivity.class);
            intent.putExtra("h", hashMap);
            startActivity(intent);

        }
    });

SecondActivity :

Toast.makeText(SecondActivity.this,"Hi " +  getIntent().getSerializableExtra("h").toString(),Toast.LENGTH_SHORT).show();

edited Sep 30, 2014 at 10:40

BackStabber

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answered Jul 15, 2014 at 7:01

VVB

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